bluuebunny/crossref_metadata_2025 huggingface dataset:
A computational approach for investigating Coulomb interaction using Wigner–Poisson coupling
Authors: Benam Majid , Ballicchia Mauro , Weinbub Josef , Selberherr Siegfried , Nedjalkov Mihail
Published: January 2021

Entangled quantum particles, in which operating on one particle instantaneously influences the state of the entangled particle, are attractive options for carrying quantum information at the nanoscale. However, fully-describing entanglement in traditional time-dependent quantum transport simulation approaches requires significant computational effort, bordering on being prohibitive. Considering electrons, one approach to analyzing their entanglement is through modeling the Coulomb interaction via the Wigner formalism. In this work, we reduce the computational complexity of the time evolution of two interacting electrons by resorting to reasonable approximations. In particular, we replace the Wigner potential of the electron–electron interaction by a local electrostatic field, which is introduced through the spectral decomposition of the potential. It is demonstrated that for some particular configurations of an electron–electron system, the introduced approximations are feasible. Purity, identified as the maximal coherence for a quantum state, is also analyzed and its corresponding analysis demonstrates that the entanglement due to the Coulomb interaction is well accounted for by the introduced local approximation.
Drones provide spatial and volumetric data to deliver new insights into microclimate modelling
Authors: Duffy James P. , Anderson Karen , Fawcett Dominic , Curtis Robin J. , Maclean Ilya M. D.
Published: January 2021

Context

Microclimate (fine-scale temperature variability within metres of Earth’s surface) is highly influential on terrestrial organisms’ ability to survive and function. Understanding how such local climatic conditions vary is challenging to measure at adequate spatio-temporal resolution. Microclimate models provide the means to address this limitation, but require as inputs, measurements, or estimations of multiple environmental variables that describe vegetation and terrain variation.

Objectives

To describe the key components of microclimate models and their associated environmental parameters. To explore the potential of drones to provide scale relevant data to measure such environmental parameters.

Methods

We explain how drone-mounted sensors can provide relevant data in the context of alternative remote sensing products. We provide examples of how direct micro-meteorological measurements can be made with drones. We show how drone-derived data can be incorporated into 3-dimensional radiative transfer models, by providing a realistic representation of the landscape with which to model the interaction of solar energy with vegetation.

Results

We found that for some environmental parameters (i.e. topography and canopy height), data capture and processing techniques are already established, enabling the production of suitable data for microclimate models. For other parameters such as leaf size, techniques are still novel but show promise. For most parameters, combining spatial landscape characterization from drone data and ancillary data from lab and field studies will be a productive way to create inputs at relevant spatio-temporal scales.

Conclusions

Drones provide an exciting opportunity to quantify landscape structure and heterogeneity at fine resolution which are in turn scale-appropriate to deliver new microclimate insights.
Proxy control
Authors: Doliana Aaron , Sundaresan Sandhya
Published: January 2021

The control dependency in grammar is conventionally distinguished into two classes: exhaustive (i→i) and non-exhaustive (i→i + (j)). Here, we show that, in languages like German and Italian, some speakers allow a new kind of “proxy control” which differs from both, such that, for a controlleri, and a controlleej,j = proxy(i). Theproxyfunction picks out a set of individuals that is discourse-pragmatically related toi. For such speakers, the German/Italian proxy control equivalent of the sentence: “Mariaiasked Billj(for permission) [pro$_{proxy(i)}$proxy(i)to leave work early]” would thus mean that Maria asked Bill for permission for some salient set of individuals related to herself to leave early. We examine the theoretical and empirical properties of this new control relation in detail, showing that it is irreducible to other, more familiar referential dependencies. Using standard empirical diagnostics, we then illustrate that proxy control can be instantiated both as a species of obligatory control (oc) and non-obligatory control (noc) in German and Italian and develop a syntactic and semantic model that derives each and details the factors conditioning the choice between the two. We also investigate the factors that condition different degrees of exhaustiveness (exhaustive vs. partial vs. proxy) in control, which then sheds light on why proxy control obtains in some languages, but not others and, within a language, is possible for some speakers but not others.
A 3D printed cast for minimally invasive transfer of distal radius osteotomy: a cadaver study
Authors: Caiti G. , Dobbe J. G. G. , Strackee S. D. , van Doesburg M. H. M. , Strijkers G. J. , Streekstra G. J.
Published: January 2021

Purpose

In corrective osteotomy of the distal radius, patient-specific 3D printed surgical guides or optical navigation systems are often used to navigate the surgical saw. The purpose of this cadaver study is to present and evaluate a novel cast-based guiding system to transfer the virtually planned corrective osteotomy of the distal radius.

Methods

We developed a cast-based guiding system composed of a cast featuring two drilling slots as well as an external cutting guide that was used to orient the surgical saw for osteotomy in the preoperatively planned position. The device was tested on five cadaver specimens with different body fat percentages. A repositioning experiment was performed to assess the precision of replacing an arm in the cast. Accuracy and precision of drilling and cutting using the proposed cast-based guiding system were evaluated using the same five cadaver arms. CT imaging was used to quantify the positioning errors in 3D.

Results

For normal-weight cadavers, the resulting total translation and rotation repositioning errors were ± 2 mm and ± 2°. Across the five performed surgeries, the median accuracy and Inter Quartile Ranges (IQR) of pre-operatively planned drilling trajectories were 4.3° (IQR = 2.4°) and 3.1 mm (IQR = 4.9 mm). Median rotational and translational errors in transferring the pre-operatively planned osteotomy plane were and 3.9° (IQR = 4.5°) and 2.6 mm (IQR = 4.2 mm), respectively.

Conclusion

For normal weight arm specimens, navigation of corrective osteotomy via a cast-based guide resulted in transfer errors comparable to those using invasive surgical guides. The promising positioning capabilities justify further investigating whether the method could ultimately be used in a clinical setting, which could especially be of interest when used with less invasive osteosynthesis material.
Development of the AL-O-A Score for Delirium Screening in Acute Internal Medicine: a Monocentric Prospective Study
Authors: John Gregor , Bovet Vincent , Verdon Vincent , Zender Hervé , Donzé Jacques
Published: January 2021

Background

Delirium occurs frequently in acute internal medicine wards and may worsen the patient’s prognosis; it deserves a fast, systematic screening tool.

Objective

Develop a delirium screening score for inpatients admitted to acute internal medicine wards.

Design

A monocentric prospective study between November 2019 and January 2020.

Participants

Two hundred and seventeen adult inpatients.

Main Measures

Within 48 h of hospital admission, physicians administered an index test to participants which explored potential predictors associated with the fluctuation of mental state, inattention, disorganised thinking and altered level of consciousness. On the same day, patients underwent a neuropsychological evaluation (reference standard) to assess for delirium. The score was constructed using a backward stepwise logistic regression strategy. Areas under the receiver operating curves (AUC) and calibration curves were drawn to calculate the score’s performance. The score was tested on subgroups determined by age, sex and cognitive status.

Results

The AL-O-A score (“abnormal or fluctuating ALertness, temporospatial Orientation and off-target Answers”) showed excellent apparent (AUC 0.95 (95% CI 0.91–0.99)) and optimism-corrected discrimination (AUC 0.92 (95% CI 0.89–0.96)). It performed equally well in subgroups with and without cognitive impairment (AUC 0.93 (95% CI 0.88–0.99) vs 0.92 (95% CI 0.80–0.99)); in men and women (AUC 0.96 (95% CI 0.94–0.99) vs 0.95 (95% CI 0.89–0.99)); and in patients younger and older than 75 years old (AUC 0.98 (95% CI 0.95–0.99) vs 0.93 (95% CI 0.87–0.99)).

Conclusions

A simple, 1-min screening test (AL-O-A score), even administered by an untrained professional, can identify delirium in internal medicine patients.
Potentiated Response of ERK/MAPK Signaling is Associated with Prolonged Withdrawal from Cocaine Behavioral Sensitization
Authors: Bingor Alexey , Azriel Matityahu , Amiad Lavi , Yaka Rami
Published: January 2021

Among the neuroadaptations underlying the expression of cocaine-induced behaviors are modifications in glutamate-mediated signaling and synaptic plasticity via activation of mitogen-activated protein kinases (MAPKs) within the nucleus accumbens (NAc). We hypothesized that exposure to cocaine leads to alterations in MAPK signaling in NAc neurons, which facilitates changes in the glutamatergic system and thus behavioral changes. We have previously shown that following withdrawal from cocaine-induced behavioral sensitization (BS), an increase in glutamate receptor expression and elevated MAPK signaling was evident. Here, we set out to determine the time course and behavioral consequences of inhibition of extracellular signal-regulated kinase (ERK) or NMDA receptors following withdrawal from BS. We found that inhibiting ERK by microinjection of U0126 into the NAc at 1 or 6 days following withdrawal from BS did not affect the expression of BS when challenged with cocaine at 14 days. However, inhibition of ERK 1 day before the cocaine challenge abolished the expression of BS. We also inhibited NR2B-containing NMDA receptors in the NAc by microinjection of ifenprodil into the NAc following withdrawal from BS, which had no effect on the expression of BS. However, microinjection of ifenprodil to the NAc 1 day before challenge attenuated the expression of BS similar to ERK inhibition. These results suggest that following a prolonged period of withdrawal, NR2B-containing NMDA receptors and ERK activity play a critical role in the expression of cocaine behavioral sensitization.
Climate Change Implications for Tidal Marshes and Food Web Linkages to Estuarine and Coastal Nekton
Authors: Colombano Denise D. , Litvin Steven Y. , Ziegler Shelby L. , Alford Scott B. , Baker Ronald , Barbeau Myriam A. , Cebrián Just , Connolly Rod M. , Currin Carolyn A. , Deegan Linda A. , Lesser Justin S. , Martin Charles W. , McDonald Ashley E. , McLuckie Catherine , Morrison Blair H. , Pahl James W. , Risse L. Mark , Smith Joseph A. M. , Staver Lorie W. , Turner R. Eugene , Waltham Nathan J.
Published: January 2021

Climate change is altering naturally fluctuating environmental conditions in coastal and estuarine ecosystems across the globe. Departures from long-term averages and ranges of environmental variables are increasingly being observed as directional changes [e.g., rising sea levels, sea surface temperatures (SST)] and less predictable periodic cycles (e.g., Atlantic or Pacific decadal oscillations) and extremes (e.g., coastal flooding, marine heatwaves). Quantifying the short- and long-term impacts of climate change on tidal marsh seascape structure and function for nekton is a critical step toward fisheries conservation and management. The multiple stressor framework provides a promising approach for advancing integrative, cross-disciplinary research on tidal marshes and food web dynamics. It can be used to quantify climate change effects on and interactions between coastal oceans (e.g., SST, ocean currents, waves) and watersheds (e.g., precipitation, river flows), tidal marsh geomorphology (e.g., vegetation structure, elevation capital, sedimentation), and estuarine and coastal nekton (e.g., species distributions, life history adaptations, predator-prey dynamics). However, disentangling the cumulative impacts of multiple interacting stressors on tidal marshes, whether the effects are additive, synergistic, or antagonistic, and the time scales at which they occur, poses a significant research challenge. This perspective highlights the key physical and ecological processes affecting tidal marshes, with an emphasis on the trophic linkages between marsh production and estuarine and coastal nekton, recommended for consideration in future climate change studies. Such studies are urgently needed to understand climate change effects on tidal marshes now and into the future.
Systems of environmental innovation: sectoral and technological perspectives on ballast water treatment systems
Authors: Makkonen Teemu , Inkinen Tommi
Published: January 2021

The research on innovation in the maritime sector has commonly focused on the implementation of innovation rather than on more complex issues such as the interplay between technological aspects, market conditions, and, particularly, regulatory regimes in shaping the emergence and growth of global systems involved with the development, production, and use of environmental innovation. Therefore, this paper sets out to analyze—by combining insights from sectoral (SSI) and technological (TIS) systems of innovation concepts—ballast water treatment systems (BWTS), designed to prevent the negative impacts of invasive species, as an example of such complex interaction. The results show how public policy and institutional acceptance have shaped the market for BWTS. First, BWTS were induced by environmental regulations mandating their use. Second, the demand for BWTS increases substantially when the implementation date of the regulations approaches. Third, differences in regulatory regimes shape the demand for various available technologies. Without coordinated regulations, this unclear operating environment remains a definite concern for shipowners when choosing the specific type of BWTS technology for onboard installation. The results also underline that the combined SSI/TIS framework, utilized in this paper, is a feasible analytical framework for studying environmental innovation.
Homotopy types of gauge groups of $$\mathrm {PU}(p)$$-bundles over spheres
Authors: Rea Simon
Published: January 2021

We examine the relation between the gauge groups of $$\mathrm {SU}(n)$$

SU
(
n
)

- and $$\mathrm {PU}(n)$$

PU
(
n
)

-bundles over $$S^{2i}$$

S

2
i

, with $$2\le i\le n$$

2
≤
i
≤
n

, particularly when n is a prime. As special cases, for $$\mathrm {PU}(5)$$

PU
(
5
)

-bundles over $$S^4$$

S
4

, we show that there is a rational or p-local equivalence $$\mathcal {G}_{2,k}\simeq _{(p)}\mathcal {G}_{2,l}$$

G

2
,
k

≃

(
p
)

G

2
,
l

for any prime p if, and only if, $$(120,k)=(120,l)$$

(
120
,
k
)
=
(
120
,
l
)

, while for $$\mathrm {PU}(3)$$

PU
(
3
)

-bundles over $$S^6$$

S
6

there is an integral equivalence $$\mathcal {G}_{3,k}\simeq \mathcal {G}_{3,l}$$

G

3
,
k

≃

G

3
,
l

if, and only if, $$(120,k)=(120,l)$$

(
120
,
k
)
=
(
120
,
l
)

.
Comparison of pollutant emission associated with the operation of passenger cars with internal combustion engines and passenger cars with electric motors
Authors: Bebkiewicz Katarzyna , Chłopek Zdzisław , Sar Hubert , Szczepański Krystian
Published: January 2021

Energy consumption and pollutant emission aspects were ascertained for cars under traffic conditions: in cities, outside cities, on motorways and expressways, with the use of data from the inventory of emissions from road transport in Poland in 2018. The values of characteristics of energy consumption under model traffic conditions, as well as pollutant emissions and energy consumption of cars with internal combustion engines and cars with electric motors, constituted the basis for further analyses and conclusions about the characteristics of the vehicles under the study in terms of energy consumption and pollutant emissions. As a result of the research, it was found in the case of the use of electric drives, a very significant decrease in energy consumption—by 70% and the emission of non-methane volatile organic compounds—at the level of 90%. In the case of the emission of nitrogen oxides, there is a great advantage in relation to cars with compression-ignition engines, while the emission of nitrogen oxides from cars with spark-ignition engines is about two times lower. It was found that the emission of particulate matter for electric cars is about three times higher than for cars with compression-ignition engines and almost six times higher than for cars with spark-ignition engines. On the other hand, the impact on carbon dioxide emissions is small—less than 10%.
The Validity and Reliability of Commercially Available Resistance Training Monitoring Devices: A Systematic Review
Authors: Weakley Jonathon , Morrison Matthew , García-Ramos Amador , Johnston Rich , James Lachlan , Cole Michael H.
Published: January 2021

Background

Monitoring resistance training has a range of unique difficulties due to differences in physical characteristics and capacity between athletes, and the indoor environment in which it often occurs. Traditionally, methods such as volume load have been used, but these have inherent flaws. In recent times, numerous portable and affordable devices have been made available that purport to accurately and reliably measure kinetic and kinematic outputs, potentially offering practitioners a means of measuring resistance training loads with confidence. However, a thorough and systematic review of the literature describing the reliability and validity of these devices has yet to be undertaken, which may lead to uncertainty from practitioners on the utility of these devices.

Objective

A systematic review of studies that investigate the validity and/or reliability of commercially available devices that quantify kinetic and kinematic outputs during resistance training.

Methods

Following PRISMA guidelines, a systematic search of SPORTDiscus, Web of Science, and Medline was performed; studies included were (1) original research investigations; (2) full-text articles written in English; (3) published in a peer-reviewed academic journal; and (4) assessed the validity and/or reliability of commercially available portable devices that quantify resistance training exercises.

Results

A total of 129 studies were retrieved, of which 47 were duplicates. The titles and abstracts of 82 studies were screened and the full text of 40 manuscripts were assessed. A total of 31 studies met the inclusion criteria. Additional 13 studies, identified via reference list assessment, were included. Therefore, a total of 44 studies were included in this review.

Conclusion

Most of the studies within this review did not utilise a gold-standard criterion measure when assessing validity. This has likely led to under or overreporting of error for certain devices. Furthermore, studies that have quantified intra-device reliability have often failed to distinguish between technological and biological variability which has likely altered the true precision of each device. However, it appears linear transducers which have greater accuracy and reliability compared to other forms of device. Future research should endeavour to utilise gold-standard criterion measures across a broader range of exercises (including weightlifting movements) and relative loads.
Acceleration through Digital Communication: Theorizing on a Perceived Lack of Time
Authors: Entschew Elisa Maria
Published: January 2021

Digital communication between humans fundamentally changes the nature of communication. One inherent change is the acceleration of communication as a systematic change in societal life, particularly in the workplace. Often, the aim is to release time resources. However, the acceleration of communication also leads to the opposite: a lack of time. This paradoxical development can be based on an acceleration cycle whereby technologies seem to be a solution on the micro-level, but they are also a significant part of the problem on the meso-level.
Evaluating the feasibility and advantage of a multi-purpose submerged breakwater for harbor protection and benthic habitat enhancement at Kahului Commercial Harbor, Hawai‘i: case study
Authors: Stender Yuko , Foley Michael , Rodgers Ku’ulei , Jokiel Paul , Singh Amarjit
Published: January 2021

Construction of breakwaters provides an engineering solution for coastal protection. However, little effort has been made toward understanding the ecological impact on local coral reef ecosystems and developing engineering structures that would enhance the coral reef environment. A submerged breakwater proposed for Kahului Commercial Harbor, Hawai‘i, provided an opportunity to design a multi-purpose ‘reef structure’ to mitigate wave impacts while providing new coral reef habitat. This design involved ecological and environmental considerations alongside engineering principles, serving as a model for environmentally sound harbor development. This field study evaluated environmental conditions and reef community composition at the proposed site in a gradient extending outward from the harbor, using in situ data with multivariate analyses. Benthic and topographic features in the area were assessed using a towed drop camera system to relate to biological factors. Results that support breakwater topography should follow the natural spur and groove and depth of the adjacent reef and orient with wave direction. A deep area characterized by unconsolidated substrata and low coral cover would be replaced with the shallow, sloping hard bottom of the breakwater, and provide an exemplary area for corals to flourish while protecting the harbor from large ocean swells. Surfaces on shallow sloping hard bottoms receive higher levels of irradiance that benefits coral growth. Optimal levels of water motion facilitate sediment removal and promote coral recruitment and growth. The design of the Kahului Harbor submerged multi-purpose structure serves as a model for design of shoreline modification that enhances, rather than degrades, the local coral reef environment.
Low-complexity signal detection and precoding algorithms for multiuser massive MIMO systems
Authors: Boukharouba Abdelhak , Dehemchi Marwa , Bouhafer Asma
Published: January 2021

In this study, we present efficient detection and precoding algorithms for massive multi-user multiple-input multiple-output wireless system. To reduce the computational complexity due to large matrix inversion, the proposed algorithms are an enhanced version of zero forcing scheme based on QR matrix decomposition for both uplink and downlink systems. Through extensive numerical experiments, we demonstrate that the proposed algorithms outperform the recently published ones in terms of performance and complexity.
Predicting the behavior of reinforced concrete columns confined by fiber reinforced polymers using data mining techniques
Authors: Ghanem Sahar Y. , Elgazzar Heba
Published: January 2021

Fiber Reinforced Polymer (FRP) usage to wrap reinforced concrete (RC) structures has become a popular technology. Most studies about RC columns wrapped with FRP in literature ignored the internal steel reinforcement. This paper aims to develop a model for the axial compressive strength and axial strain for FRP confined concrete columns with internal steel reinforcement. The impact of FRP, Transverse, and longitudinal reinforcement is studied. Two non-destructive analysis methods are explored: Artificial Neural Networks (ANNs) and Regression Analysis (RA). The database used in the analysis contains the experimental results of sixty-four concrete columns under the compressive concentric load available in the literature. The results show that both models can predict the column's compressive stress and strain reasonably with low error and high accuracy. FRP has the highest effect on the confined compressive stress and strain compared to other materials. While the longitudinal steel actively contributes to the compressive strength, and the transverse steel actively contributes to the compressive strain.
Impact of Mitochondrial Genetic Variants in ND1, ND2, ND5, and ND6 Genes on Sperm Motility and Intracytoplasmic Sperm Injection (ICSI) Outcomes
Authors: Al Smadi Mohammad A. , Hammadeh Mohamad Eid , Solomayer Erich , Batiha Osamah , Altalib Mohammad M. , Jahmani Mohammad Y. , Shboul Mohammad A. , Nusair Bassam , Amor Houda
Published: January 2021

Sperm mitochondrial dysfunction causes the generation of an insufficient amount of energy needed for sperm motility. This will affect sperm fertilization capacity, and thus, most asthenozoospermic men usually require assisted reproductive techniques. The etiology of asthenozoospermia remains largely unknown. The current study aimed to investigate the effect of mitochondrial genetic variants on sperm motility and intracytoplasmic sperm injection (ICSI) outcomes. A total of 150 couples from the ICSI cycle were enrolled in this study. One hundred five of the male partners were asthenozoospermic patients, and they were subdivided into three groups according to their percentage of sperm motility, while forty-five of the male partners were normozoospermic. Genetic variants were screened using direct Sanger’s sequencing in four mitochondrial genes (nicotinamide adenine dinucleotide hydrogen (NADH) dehydrogenase 1 (ND1), NADH dehydrogenase 2 (ND2), NADH dehydrogenase 5 (ND5), and NADH dehydrogenase 6 (ND6)). We identified three significant variants: 13708G>A (rs28359178) in ND5, 4216T>C (rs1599988) in ND1, and a novel 12506T>A in ND5 with P values 0.006, 0.036, and 0.013, respectively. The medians of sperm motility, fertilization rate, embryo cleavage score, and embryo quality score were significantly different between men showing 4216T>C, 12506T>A, 13708G>A and wild type, Mann-Whitney P values for the differences in the medians were < 0.05 in all of them. The results from this study suggest that 13708G>A, 12506T>A, and 4216 T>C variants in sperm mitochondrial DNA negatively affect sperm motility and ICSI outcomes.
Towards a Circular Economy Taxation Framework: Expectations and Challenges of Implementation
Authors: Milios Leonidas
Published: January 2021

The transition to a circular economy is a complex process requiring wide multi-level and multi-stakeholder engagement and can be facilitated by appropriate policy interventions. Taking stock of the importance of a well-balanced policy mix that includes a variety of complementing policy instruments, the circular economy action plan of the European Union (COM(2020) 98 final) includes a section about “getting the economics right” in which it encourages the application of economic instruments. This contribution presents a comprehensive taxation framework, applied across the life cycle of products. The framework includes (1) a raw material resource tax, (2) reuse/repair tax relief, and (3) a waste hierarchy tax at the end of life of products. The research is based on a mixed method approach, using different sources to analyse the different measures in the framework. More mature concepts, such as material resource taxes, are analysed by reviewing the existing literature. The analysis of tax relief on repairs is based on interviews with stakeholders in Sweden, where this economic policy instrument has been implemented since 2017. Finally, for the waste hierarchy tax, which is a novel proposition in this contribution, macroeconomic modelling is used to analyse potential impacts of future implementation. In all cases, several implementation challenges are identified, and potential solutions are discussed according to literature and empirical sources. Further research is required both at the individual instrument and at the framework level. Each of the tax proposals needs a more detailed examination for its specificities of implementation, following the results of this study.
Clash of Powers
Authors: Hopewell Kristen
Published: January 2021

The US-China trade war instigated by President Trump has thrown the multilateral trading system into a crisis. Drawing on vast interview and documentary materials, Hopewell shows how US-China conflict had already paralyzed the system of international rules and institutions governing trade. The China Paradox – the fact that China is both a developing country and an economic powerhouse – creates significant challenges for global trade governance and rule-making. While China demands exemptions from global trade disciplines as a developing country, the US refuses to extend special treatment to its rival. The implications of this conflict extend far beyond trade, impeding pro-development and pro-environment reforms of the global trading system. As one of the first analyses of the implications of US-China rivalry for the governance of global trade, this book is crucial to our understanding of China's impact on the global trading system and on the liberal international economic order.
Findings Predictive of Poor Outcome in Grade 5 Subarachnoid Hemorrhage: A Cohort Study
Authors: Kramer Andreas H. , Couillard Philippe L. , Kromm Julie A. , Ruddell Stacy , Demers-Marcil Simon , Mitha Alim P. , Sutherland Garnette R. , Wong John H.
Published: January 2021

Background:

Most patients with World Federation of Neurological Surgeons (WFNS) grade 5 subarachnoid hemorrhage (SAH) have poor outcomes. Accurate assessment of prognosis is important for treatment decisions and conversations with families regarding goals of care. Unjustified pessimism may lead to “self-fulfilling prophecy,” where withdrawal of life-sustaining measures (WLSM) is invariably followed by death.

Methods:

We performed a cohort study involving consecutive patients with WFNS grade 5 SAH to identify variables with >= 90% and >= 95% positive predictive value (PPV) for poor outcome (1-year modified Rankin Score >= 4), as well as findings predictive of WLSM.

Results:

Of 140 patients, 38 (27%) had favorable outcomes. Predictors with >= 95% PPV for poor outcome included unconfounded 72-hour Glasgow Coma Scale motor score <= 4, absence of >= 1 pupillary light reflex (PLR) at 24 hours, and intraventricular hemorrhage (IVH) score of >= 20 (volume >= 54.6 ml). Intracerebral hemorrhage (ICH) volume >= 53 ml had PPV of 92%. Variables associated with WLSM decisions included a poor motor score (p < 0.0001) and radiographic evidence of infarction (p = 0.02).

Conclusions:

We identified several early predictors with high PPV for poor outcome. Of these, lack of improvement in motor score during the initial 72 hours had the greatest potential for confounding from “self-fulfilling prophecy.” Absence of PLR at 24 hours, IVH score >= 20, and ICH volume >= 53 ml predicted poor outcome without a statistically significant effect on WLSM decisions. More research is needed to validate prognostic variables in grade 5 SAH, especially among patients who do not undergo WLSM.
Association between serum zinc concentrations and metabolic risk factors among Chinese children and adolescents
Authors: Zhu Qianrang , Dai Yue , Zhang Jingxian , Xie Wei , Zuo Hui , Zhang Jian , Zhou Yonglin
Published: January 2021

The aim of the present study was to examine whether serum Zn concentrations were associated with metabolic risk factors in Chinese children and adolescents. This was a cross-sectional study including 3241 participants, aged 6 to 17 years, from Jiangsu, China. Metabolic risk factors included fasting glucose (FG), total cholesterol (TC), TAG, HDL-cholesterol, LDL-cholesterol, systolic blood pressure and diastolic blood pressure. Data were analysed using multi-variable linear regression and generalised additive models, which were adjusted for age, sex, high-sensitive C-reactive protein, estimated glomerular filtration rate, BMI and region of residence, to assess the associations of serum Zn concentrations with metabolic risk factors. We observed a negative association between serum Zn concentrations and FG (coefficient = −0·532; 95 % CI −0·569, −0·495; P < 0·001). Moreover, TC (coefficient = 0·175; 95 % CI 0·127, 0·222; P < 0·001), HDL-cholesterol (coefficient = 0·137; 95 % CI 0·082, 0·193; P < 0·001) and LDL-cholesterol (coefficient = 0·195; 95 % CI 0·128, 0·263; P < 0·001) were found to be positively associated with Zn levels. A generalised additive model showed that the negative association between serum Zn and FG was weak at lower serum Zn concentrations and was stronger with the increase in serum Zn concentrations. Additionally, a U-shaped association between serum Zn and TAG was observed. Serum Zn concentrations were associated with FG, TC, TAG, HDL-cholesterol and LDL-cholesterol levels in Chinese children and adolescents. Lower levels of serum Zn were more likely related to a poor metabolic status.
The Effect of Austerity Packages on Government Popularity During the Great Recession
Authors: Bojar Abel , Bremer Björn , Kriesi Hanspeter , Wang Chendi
Published: January 2021

During the Great Recession, governments across the continent implemented austerity policies. A large literature claims that such policies are surprisingly popular and have few electoral costs. This article revisits this question by studying the popularity of governments during the economic crisis. The authors assemble a pooled time-series data set for monthly support for ruling parties from fifteen European countries and treat austerity packages as intervention variables to the underlying popularity series. Using time-series analysis, this permits the careful tracking of the impact of austerity packages over time. The main empirical contributions are twofold. First, the study shows that, on average, austerity packages hurt incumbent parties in opinion polls. Secondly, it demonstrates that the magnitude of this electoral punishment is contingent on the economic and political context: in instances of rising unemployment, the involvement of external creditors and high protest intensity, the cumulative impact of austerity on government popularity becomes considerable.
Party Unity and Discipline in Canadian Politics
Authors: Lewis J. P.
Published: January 2021

Anyone with a passing understanding of Canadian politics is aware of the stubborn presence of party discipline in the parliamentary system. It is not a phenomenon that has been left to the stuffy corners of the ivory tower. Political actors and the media have complained about party discipline for decades. Reforms have been proposed; party leaders have promised new ways forward. As a central trait of Canadian Parliament, party discipline has driven away voters—it has even inspired the development of new political parties. What role can Canadian political science play in understanding party discipline 75 years after these familiar sentiments appeared in the predecessor to this journal: “How could this control [party discipline] be destroyed, and the individual member be made an independent critic of government and of legislation, and a responsible servant of the people” (Morton, 1946: 136)? It turns out Canadian political science has much to offer. With the publication of J. F. Godbout'sLost on Division: Party Unity in the Canadian Parliamentand Alex Marland'sWhipped: Party Discipline in Canada, 2020 has been a monumental year for the study of Canadian Parliament and political parties.
OMNES QVI SVNT EIVS ORDINIS A POMPEIO EVOCANTVR: THE PROCONSUL POMPEIUS’ SENATORIAL MEETING IN 49 b.c.
Authors: Frolov Roman M.
Published: January 2021

In his Bellum Ciuile, Caesar reports the events of 1 January 49 with these words (1.3.1):

misso ad uesperum senatu omnes qui sunt eius ordinis a Pompeio euocantur. laudat  Pompeius atque in posterum confirmat, segniores castigat atque incitat.

When the Senate had been dismissed towards dusk, all who belonged to that order were summoned by Pompeius. He praised the determined and encouraged them for the future while criticizing and stirring up those who were less eager to act.

This meeting has not attracted much scholarly attention and admittedly for a good reason: other circumstances of the outbreak of the Civil War are, perhaps, more significant for understanding the events as well as the intentions and decisions of the political actors. The importance of this gathering lies, however, not so much in what its role might have been in the developments of the year 49 but rather in the context of the phenomenon of the promagistrates’ interference in the domestic politics of Late Republican Rome.
Zircon in mantle eclogite xenoliths: a review
Authors: Melnik Aleksey E. , Korolev Nester M. , Skublov Sergey G. , Müller Dirk , Li Qiu-Li , Li Xian-Hua
Published: January 2021

Very few zircon-bearing, kimberlite-hosted mantle eclogite xenoliths have been identified to date; however, the zircon they contain is crucial for our understanding of subcratonic lithospheric mantle evolution and eclogite genesis. In this study, we constrain the characteristics of zircon from mantle eclogite xenoliths based on existing mineralogical and geochemical data from zircons from different geological settings, and on the inferred origin of mantle eclogites. Given the likely origin and subsequent evolution of mantle eclogites, we infer that the xenoliths can contain zircons with magmatic, metamorphic and xenogenic (i.e. kimberlitic zircon) origins. Magmatic zircon can be inherited from low-pressure mafic oceanic crust precursors, or might form during direct crystallization of eclogites from primary mantle-derived melts at mantle pressures. Metamorphic zircon within mantle eclogites has a number of possible origins, ranging from low-pressure hydrothermal alteration of oceanic crustal protoliths to metasomatism related to kimberlite magmatism. This study outlines a possible approach for the identification of inherited magmatic zircon within subduction-related mantle eclogites as well as xenogenic kimberlitic zircon within all types of mantle eclogites. We demonstrate this approach using zircon grains from kimberlite-hosted eclogite xenoliths from the Kasai Craton, which reveals that most, if not all, of these zircons were most likely incorporated as a result of laboratory-based contamination.
New Paradoxes of Motion: Arguing Against Open-Bounded Material Objects
Authors: Pezet Robert E.
Published: January 2021

It is widely assumed that a geometric model of boundaries, which prescribes a tripartite topological characterisation of the boundaries for material objects – fully open, fully closed, or partially open/closed – can be unproblematically extended from regions to material objects. Drawing on a disanalogy between regions and material objects – that only the latter move – I demonstrate the incoherence of (fully or partially) open material objects through two arguments relating to the ability for such objects to freely move. The first is a dilemma considering separately open material objects occupying their location directly or indirectly (located in virtue of their proper parts occupying locations). It is argued that movement in the former case would involve a miraculous topological transformation; whilst in the latter case, would involve miraculous reorganising movements in the object's proper parts. The second argument reignites a problem regarding the moment of change specifically for the movement of such objects.
Research on the hydrographic survey cycle for updating navigational charts
Authors: Duan Jing , Wan Xiaoxia , Luo Jianan
Published: January 2021

Due to the vast ocean area and limited human and material resources, hydrographic survey must be carried out in a selective and well-planned way. Therefore, scientific planning of hydrographic surveys to ensure the effectiveness of navigational charts has become an urgent issue to be addressed by the hydrographic office of each coastal state. In this study, a reasonable calculation model of hydrographic survey cycle is established, which can be used to make the plan of navigational chart updating. The paper takes 493 navigational charts of Chinese coastal ports and fairways as the research object, analyses the fundamental factors affecting the hydrographic survey cycle and gives them weights, proposes to use the BP neural network to construct the relationship between the cycle and the impact factors, and finally establishes a calculation model of the hydrographic survey cycle. It has been verified that the calculation cycle of the model is effective, and it can provide reference for hydrographic survey planning and chart updating, as well as suggestions for navigation safety.
Finding Pleasure and Satisfaction in Perfectionism
Authors: Hayes Michael
Published: January 2021

Many philosophers find welfare perfectionism implausible because it is arguably underinclusive, as it fails to count as good certain acts, events, and things that intuitively improve one's quality of life. Likewise, philosophers intuit that the experience of pleasure directly contributes to well-being. The problem for welfare perfectionism is straightforward: neither desire-satisfaction nor the experience of pleasure seem to perfect (or be perfections of) one's nature.

This leaves two options for the welfare perfectionist. He can “bite the bullet” and argue that these intuitions are mistaken and that pleasure and desire-satisfaction don't impact well-being. Alternatively, he can explain how such intuitive goods can directly contribute to well-being, despite initial appearances. I advance the latter approach.

I argue that at least for some perfectionists, desire-satisfaction and pleasure both directly contribute to well-being. One cannot argue that welfare perfectionism necessarily neglects the intuitive importance of desire-satisfaction and pleasure.
Prevalence of thinness, overweight and obesity among Tibetan adolescents aged 12–17 years
Authors: Zhang Yunfei , Sun Jiahong , Zhao Min , Magnussen Costan G , Xi Bo
Published: January 2021

Objective:

To estimate the prevalence of thinness, overweight and obesity among Tibetan adolescents aged 12–17 years.

Design:

Cross-sectional survey.

Setting:

Shigatse City of Tibet municipality, with an average altitude of more than 4000 m.

Participants:

Study participants included 2642 adolescents aged 12–17 years selected from six schools using a convenient cluster sampling method.

Results:

The prevalence of thinness/overweight/obesity among Tibetan adolescents was 9·4 %/5·4 %/1·4 % (China definition), 14·7 %/4·4 %/0·7 % (International Obesity Task Force (IOTF) definition), and 2·8 %/5·7 %/0·9 % (WHO definition). The prevalence of thinness and overweight was significantly different between both sexes based on each of three BMI classification criteria (P < 0·001). There was no significant difference in the prevalence of obesity between both sexes according to each of three BMI criteria. There was no clear trend in the prevalence of thinness across ages according to the China or IOTF definition (both P > 0·05), whereas an upward trend was observed for thinness in boys according to the IOTF definition (Pfor trend <0·05). In contrast, the prevalence of thinness tended to decrease with increasing age in girls according to the IOTF definition and in total sample according to the WHO definition (Pfor trend <0·05).

Conclusions:

Among Tibetan adolescents, the prevalence of overweight and obesity is relatively low, while the prevalence of thinness is high, especially in boys. These data suggest urgent attention is needed to control adolescent thinness in Tibet.
The association between dietary patterns with type 2 diabetes mellitus and pre-diabetes in the Henan rural cohort study
Authors: Xue Yuan , Liu Chang , Wang Bingya , Mao Zhenxing , Yu Songcheng , Wang Yan , Zhang Dongdong , Wang Chongjian , Li Wenjie , Li Xing
Published: January 2021

Objective:

We aimed to investigate whether dietary patterns were associated with the risk of type 2 diabetes mellitus (T2DM) or pre-diabetes in adults of rural area in Henan.

Design:

Cross-sectional study. Principal component analysis was used to identify dietary patterns, while multivariate logistic regression analysis and restricted cubic spline regression models were used to analyse the association between dietary patterns and both pre-diabetes and T2DM.

Setting:

Rural area of Henan province, China.

Participants:

A total of 38 779 adults aged 18–79 years were recruited from the Henan rural cohort study as the subjects.

Results:

The prevalence of pre-diabetes and T2DM in rural Henan was 6·8 % and 9·4 %, respectively. A total of three dietary patterns were assessed in the present study. Dietary pattern I with a high intake of red meat and white meat; dietary pattern II with a high intake of grains, nuts, milk and eggs and dietary pattern III with a high intake of vegetables, staple food and fruits. The highest quintile (Q5) of pattern III could reduce 32·7 % risk of pre-diabetes. The Q5 of pattern II showed a 15·5 % decreased risk of T2DM, in a U-shaped dose–response manner; meanwhile, the Q5 of pattern III was significantly associated with reduced risks of T2DM (OR: 0·582, 95 % CI (0·497, 0·682)).

Conclusions:

Pattern III is beneficial for reducing risk of pre-diabetes or T2DM. Though a higher consumption of ‘grains-nuts-egg’ may associate with a reduced risk of T2DM, excessive intakes should be avoided. This study may provide a reference for the prevention of diabetes on dietary precautions.
Maternal dietary diversity during pregnancy and risk of low birth weight in newborns: a systematic review
Authors: Kheirouri Sorayya , Alizadeh Mohammad
Published: January 2021

Objective:

Maternal nutrition during pregnancy is a key factor influencing birth outcome. Dietary diversity is a proxy for multiple macro- and/or micronutrient sufficiency of an individual’s diet. This systematic review aimed to summarise the findings on the association between maternal dietary diversity during pregnancy and the risk of low birth weight (LBW) in newborns.

Design:

This is a systematic review study.

Setting:

Google and the PubMed, Scopus and Google Scholar databases were searched to extract original studies on humans published until June 2020, without date restrictions. There was no limitation regarding geographic region or economic condition of countries. Duplicated and irrelevant studies were screened out and data were obtained through critical analysis.

Participants:

Articles that examined the association between maternal dietary diversity during pregnancy and the risk of LBW in infants were included.

Results:

Of the ninety-eight studies retrieved, fifteen articles were included in the final review. All included articles represent low- and middle-income countries. Eighty percentage of the studies (n12) indicated that low maternal dietary diversity during pregnancy is associated with an increased risk of LBW infants. Three studies that included a small number of LBW infants and did not take into account factors which may bias study results failed to show this association.

Conclusion:

The results suggest that low maternal dietary diversity during pregnancy may be associated with the risk of LBW, more specifically in developing countries. Dietary diversity might be a valuable predictor of maternal nutrition during pregnancy and the chance of giving birth to a LBW infant.