bluuebunny/crossref_metadata_2025 huggingface dataset:
Molecular relaxation effects on vibrational water vapor photoacoustic spectroscopy in air
Authors: Lang Benjamin , Breitegger Philipp , Brunnhofer Georg , Prats Valero Jordi , Schweighart Simon , Klug Andreas , Hassler Wolfgang , Bergmann Alexander
Published: March 2020

Photoacoustic spectroscopy is a highly sensitive technique, well suited for and used in applications targeting the accurate measurement of water vapor in a wide range of concentrations. This work demonstrates the nonlinear photoacoustic response obtained for water vapor in air at typical atmospheric concentration levels, which is a result of the resonant vibrational coupling of water and oxygen. Relevant processes in the relaxation path of water in a mixture with air, excited with near-infrared radiation, are identified and a physical model for the acoustic signal measured with a resonant photoacoustic cell is presented. The model is valid for modulation frequencies typical for conventional and quartz-enhanced photoacoustic spectroscopy and provides a simplified means of calibration for photoacoustic water vapor sensors. Estimated values for comprised model coefficients are evaluated from photoacoustic measurements of water vapor in synthetic air. Furthermore, it is shown experimentally that the process of vibrational excitation of nitrogen is of negligible importance in the relaxation path of water vapor and thus insignificant in the photoacoustic heat production in atmospheric measurement environments.
Record-breaking heat wave in southern China and delayed onset of South China Sea summer monsoon driven by the Pacific subtropical high
Authors: Deng Kaiqiang , Yang Song , Gu Dejun , Lin Ailan , Li Chunhui
Published: March 2020

We investigate a record-breaking heat wave in southern China (SC) and explore its association with the South China Sea (SCS) summer monsoon (SCSSM), using station observations and various reanalysis products. This heat wave event started in mid-May 2018 and persisted more than 15 days, when the maximum air temperature anomaly exceeded 6 °C. Meanwhile, the onset of the SCSSM was extremely late in 2018, primarily due to the intrusion of easterly winds over the SCS. We show that the anomalous easterlies over the SCS associated with the delayed SCSSM could block the moisture transport from the tropical oceans to SC, which led to decreased rainfall, increased surface radiation, and elevated probability of heat wave in SC during May 2018. Further analysis reveals that both SC heat waves and SCSSM were significantly affected by the Pacific subtropical high (PSH). The westward extension of the PSH can hinder the establishment of SCSSM via inducing easterly anomalies over the SCS, which reduces SC rainfall and results in a drier surface condition. Moreover, the westward displacement of the PSH may cause anomalously high pressures, descending air motions, and divergent winds over SC, which triggers above-normal air temperatures that are conducive to the occurrences of SC heat waves. This study also underlines the importance of Eurasian planetary wave trains in bridging the upstream climate variability and the changes in PSH during boreal spring, which could be used to improve the intra-seasonal predictions of SC heat wave and SCSSM onset.
Pressure dependence of graphitization: implications for rapid recrystallization of carbonaceous material in a subduction zone
Authors: Nakamura Yoshihiro , Yoshino Takashi , Satish-Kumar Madhusoodhan
Published: March 2020

We report the results of kinetic experiments of graphitization at various pressures (0.5–8.0 GPa) and durations (1 s to 24 h) at 1200 °C. The natural carbonaceous material in sedimentary rocks from the Shimanto accretionary complex and the Hidaka metamorphic belt, Japan, underwent systematic changes in crystallinity and morphology with increasing pressure. To assess the pressure dependence of graphitization, we adopted three approaches to formulating the graphitization kinetics using a power law rate model, a Johnson–Mehl–Avrami–Kolmogorov model, and a superposition method. Activation volumes of − 21.7 ± 3.0 to − 45.7 ± 4.5 cm3 mol−1 and − 0.7 ± 0.2 to − 16.8 ± 1.8 cm3 mol−1 were obtained for pressures from 0.5 to 2.0 GPa and 2.0 to 8.0 GPa, respectively. Such large negative activation volumes might arise from structural modification and compression in the primary carbonaceous material. We applied the experimental data to the Arrhenius-type equation of graphitization, extrapolated to geological P–T–t conditions. Our model predicts that carbonaceous material undergoing metamorphism for ~ 10 Myr at pressures of 0.5–3.0 GPa will begin to crystallize at around 350–420 °C and transform fully to ordered graphite at around 450–600 °C, depending on the peak pressure. Thus, natural graphitization might proceed much more rapidly than previously estimated, owing to the large negative activation volumes for the reaction rate. This indicates that subducted carbonaceous materials will completely convert to fully ordered graphite by rapid recrystallization and metamorphic devolatilization before reaching sub-arc depths (< 100 km).
Self-directed home-based neuromuscular electrical stimulation (NMES) in patients with advanced cancer and poor performance status: a feasibility study
Authors: O’Connor Dominic , Lennon Olive , Wright Sarah , Caulfield Brian
Published: March 2020

Purpose

Concurrent neuromuscular electrical stimulation (NMES) involving sub-tetanic low frequency and tetanic high frequency which targets aerobic and muscular fitness is a potential alternative to conventional exercise in cancer rehabilitation. However, its safety and feasibility in patients with advanced cancer are unknown. The aim of this feasibility study was to determine safety and feasibility and evaluate changes in functional and health-related quality of life (HR-QoL) outcomes in individuals with advanced cancer and poor performance status after concurrent NMES. These results should help inform the design of future studies.

Methods

Participants with advanced cancer and poor performance status (Eastern Cooperative Oncology Group scale ≥ 2) (n = 18) were recruited. The intervention included a novel NMES intervention implemented over a 4-week period. Functional exercise capacity, lower limb muscle endurance and HR-QoL were measured by 6-min walk test (6MWT), 30-s sit-to-stand (30STS) and European Organization for Research and Treatment quality of life questionnaire core-30 (EORTC QLQ C30) pre and post-intervention. Participants unable to complete the 6-min walk test completed the timed up and go test. Participant experience and the impact of the intervention on daily life were investigated through semi-structured interviews.

Results

Ten of 18 participants completed the intervention. No adverse events were reported. Seven of 8 participants improved 6MWT performance (2 of 2 improved timed up and go), 8 of 10 participants improved 30STS and 8 of 10 participants improved Global quality of life. Perceived benefits included improved mobility and muscle strength.

Conclusions

Neuromuscular electrical stimulation appears safe and feasible in advanced cancer and may improve physical and HR-QoL outcomes. Future prospective trials are warranted to confirm these findings prior to clinical implementation in an advanced cancer setting.
Accelerated changes of glaciers in the Yulong Snow Mountain, Southeast Qinghai-Tibetan Plateau
Authors: Wang Shijin , Che Yanjun , Pang Hongxi , Du Jiankuo , Zhang Zhonglin
Published: March 2020

The Yulong Snow Mountain (YSM) is a region of temperate glaciers in the southeast Qinghai-Tibetan Plateau. The present study systematically assessed the glacier changes during the past several decades using ground-based and remotely sensed observations and referencing topographic maps. The images and maps revealed that the glaciers area in the YSM retreated by 64.02% from 1957 to 2017. The length of Baishui River Glacier No. 1 decreased by 12.5 m/year during this period, whereas the front elevation of this glacier increased by 10.83 m/year. The mean annual mass balance of this glacier was at − 0.42 metre water equivalent from 1957 to 2017, and its accumulative mass balance was − 27.45 metre water equivalent. The glacier retreats of glacier area, glacier front, and mass balance in the YSM primarily resulted from the increasing air temperature. These glacier retreats not only will have a negative impact on glacier tourism in the future, e.g., the retreat or disappearance of glaciers will reduce the attractiveness of mountainous scenic spots, but also will create new opportunities for the development of local tourism, e.g., “last chance” will simulate tourists’ curiosity. Hence, the findings of our present study help to understand the mechanism between accelerated ablation of temperate glaciers and climate change in southeast regions of Qinghai-Tibetan Plateau and provide references for local tourism administrations.
Effective Models and Numerical Homogenization for Wave Propagation in Heterogeneous Media on Arbitrary Timescales
Authors: Abdulle Assyr , Pouchon Timothée
Published: March 2020

A family of effective equations for wave propagation in periodic media for arbitrary timescales$$\mathcal {O}(\varepsilon ^{-\alpha })$$O(ε-α), where$$\varepsilon \ll 1$$ε≪1is the period of the tensor describing the medium, is proposed. The well-posedness of the effective equations of the family is ensured without requiring a regularization process as in previous models (Benoit and Gloria in Long-time homogenization and asymptotic ballistic transport of classical waves, 2017,arXiv:1701.08600; Allaire et al. in Crime pays; homogenized wave equations for long times, 2018,arXiv:1803.09455). The effective solutions in the family are proved to be$$\varepsilon $$εclose to the original wave in a norm equivalent to the$${\mathrm {L}^{\infty }}(0,\varepsilon ^{-\alpha }T;{{\mathrm {L}^{2}}(\varOmega )})$$L∞(0,ε-αT;L2(Ω))norm. In addition, a numerical procedure for the computation of the effective tensors of arbitrary order is provided. In particular, we present a new relation between the correctors of arbitrary order, which allows to substantially reduce the computational cost of the effective tensors of arbitrary order. This relation is not limited to the effective equations presented in this paper and can be used to compute the effective tensors of alternative effective models.
Comparative ecological and behavioral study of Macaca assamensis and M. mulatta in Shivapuri Nagarjun National Park, Nepal
Authors: Khatiwada Sunil , Paudel Pavan Kumar , Chalise Mukesh K. , Ogawa Hideshi
Published: March 2020

Resource partitioning reduces the competition between different species within the same habitat, promoting their coexistence. To understand how such species co-adapt to reduce conflicts, we examined the behavior of two primates, Assamese macaque (Macaca assamensis) and rhesus macaque (Macaca mulatta), from April 2017 to March 2018 in Sivapuri Nagarjun National Park (SNNP), Kathmandu Valley, Nepal. We performed 1580 and 1261 scan sessions on wild multi-male/multi-female groups of Assamese and rhesus macaques, respectively, at 15-min sampling intervals. Assamese macaques consumed fewer plant species (38 species) than rhesus macaques (88 species). Overlapping food sources between the macaque species resulted in a Pianka index of 0.5. Assamese macaques consumed more items of tree, climber, and vine species, whereas rhesus macaques fed on more shrub, herb, and grass species. The proportions of plant parts consumed by the two species differed—more leaves, fruits and cones were used by Assamese macaques than rhesus macaques, whereas more flowers, seeds, and pods were consumed by rhesus macaques than Assamese macaques. Assamese macaques had a smaller home range (0.55 km2) than rhesus macaques (4.23 km2), and Assamese macaques had a shorter daily moving distance (1.6 km) than rhesus macaques (4.0 km). Although feeding time did not differ between the two macaque species, less time was devoted to social activities by Assamese macaques (16.0%) than by rhesus macaques (33.7%). Assamese macaques were generally arboreal, with 94.0% of their activities in trees, whereas rhesus macaques were largely terrestrial, with 58.5% of their activities on the ground. These differences in food selection, home-range size, ranging and activity patterns, and habitat use suggest that Assamese and rhesus macaques reduce resource competition through resource partitioning to coexist in a landscape matrix.
The Picard Group of an Order and Külshammer Reduction
Authors: Eisele Florian
Published: March 2020

Let $(K,\mathcal {O},k)$
(
K
,
O
,
k
)
be a p-modular system and assume k is algebraically closed. We show that if Λ is an $\mathcal {O}$
O
-order in a separable K-algebra, then $\text {Pic}_{\mathcal {O}}({\Lambda })$

Pic

O

(
Λ
)
carries the structure of an algebraic group over k. As an application to the modular representation theory of finite groups, we show that a reduction theorem by Külshammer concerned with Donovan’s conjecture remains valid over $\mathcal {O}$
O
.
Assessment of an Evolution Equation for the Displacement Speed of a Constant-Density Reactive Scalar Field
Authors: Yu Rixin , Nilsson Thommie , Brethouwer Geert , Chakraborty Nilanjan , Lipatnikov Andrei
Published: March 2020

The displacement speed that characterises the self-propagation of isosurfaces of a reaction progress variable is of key importance for turbulent premixed reacting flow. The evolution equation for the displacement speed was derived in a recent work of Yu and Lipatnikov (Phys Rev E 100:013107, 2019a) for the case where the flame is described by a transport equation for single reaction progress variable assuming simple transport and one-step chemistry. This equation represents interaction of a number of complex coupled mechanisms related to straining by the velocity field, surface curvature and the scalar gradient. The aim of the current work is to provide detailed physical explanations of the displacement speed equation and its various terms, and to provide a new perspective to understand the mechanisms responsible for observed variations in the displacement speed. The equation is then used to analyze the propagation of a statistically planar reaction wave in homogeneous isotropic constant-density turbulence using direct numerical simulations. Additional emphasis is put on retracting surface segments that have a negative displacement speed, a phenomenon that commonly occurs at high Karlovitz numbers.
Sub-grid Reaction Progress Variable Variance Closure in Turbulent Premixed Flames
Authors: Keil F. B. , Klein M. , Chakraborty N.
Published: March 2020

The statistical behaviour and modelling of the sub-grid variance of reaction progress variable have been analysed based on a priori analysis of Direct Numerical Simulation (DNS) data of freely propagating statistically planar turbulent premixed flames with different turbulence intensities. It has been found that an algebraic expression, which can be derived based on a presumed bi-modal sub-grid distribution of reaction progress variable with impulses at unburned reactants and fully burned products, is inadequate for the purpose of prediction of sub-grid variance. An algebraic model, which is often used for modelling sub-grid variance of passive scalars, has been found to significantly overpredict the sub-grid variance of reaction progress variable for the cases considered here. The statistical behaviours of the terms of the sub-grid variance have been analysed in detail and explained based on scaling arguments. It has been found that reaction rate and molecular dissipation contributions play leading order roles in the transport of sub-grid reaction progress variable variance and they remain in approximate equilibrium for large filter widths. Suitable model expressions have been identified for the sub-grid flux of variance, reaction rate contribution and scalar dissipation rate based on a priori analysis of DNS data.
Self-driving database systems: a conceptual approach
Authors: Kossmann Jan , Schlosser Rainer
Published: March 2020

Challenges for self-driving database systems, which tune their physical design and configuration autonomously, are manifold: Such systems have to anticipate future workloads, find robust configurations efficiently, and incorporate knowledge gained by previous actions into later decisions. We present a component-based framework for self-driving database systems that enables database integration and development of self-managing functionality with low overhead by relying on separation of concerns. By keeping the components of the framework reusable and exchangeable, experiments are simplified, which promotes further research in that area. Moreover, to optimize multiple mutually dependent features, e.g., index selection and compression configurations, we propose a linear programming (LP) based algorithm to derive an efficient tuning order automatically. Afterwards, we demonstrate the applicability and scalability of our approach with reproducible examples.
A Systematic Review of the Literature on Aspects Affecting Positive Classroom Climate in Multicultural Early Childhood Education
Authors: Khalfaoui Andrea , García-Carrión Rocío , Villardón-Gallego Lourdes
Published: March 2020

The risk for many young children from minority backgrounds of being excluded from a quality education might be reduced through the creation of a positive classroom climate. A systematic review was conducted to gain a better understanding of the pedagogical and structural aspects that foster a positive classroom climate in multicultural early childhood education settings. Following a systematic review procedure, 14 articles were selected and included in the analysis. The findings indicate that eight aspects contribute to a positive climate in these settings: on the one hand, pedagogical practices, including increased instructional time, teacher-student supportive interactions, peer interactions and friendship, child engagement, teacher training on emotionally supportive environments and teacher-family trust-based relationships, and on the other hand, structural aspects, including small peer groups and materials shared among children. This evidence may be used to foster a classroom climate that enhances learning processes and social development in multicultural preschool groups. However, more research is needed to better understand the particular role that cultural diversity plays in the classroom climate.
Objects or Others? Epistemic Agency and the Primary Harm of Testimonial Injustice
Authors: McGlynn Aidan
Published: March 2020

This paper re-examines the debate between those who, with Miranda Fricker, diagnose the primary, non-contingent harm of testimonial injustice as a kind of epistemic objectification and those who contend it is better thought of as a kind of epistemic othering. Defenders of the othering account of the primary harm have often argued for it by presenting cases of testimonial injustice in which the testifier’s epistemic agency is affirmed rather than denied, even while their credibility is unjustly impugned. In previous work, I have instead argued that such cases suggest that we need to enrich our conception of epistemic objectification in ways encouraged by Martha Nussbaum’s cluster analysis of objectification. Here I continue to make the case for this approach, and I consider the othering account in more detail. I focus in particular on Gaile Pohlhaus Jr.’s arguments for a version of the othering account in terms of the notion of derivatization, which turns on the idea that only such an account can enable us to properly understand the harms of testimonial injustice, in particular the ways in which it interferes with a subject’s epistemic agency and autonomy, and I’ll argue that such arguments should not sway us. Finally, I’ll further support my contention that it is illuminating and helpful to think of the primary harm of testimonial injustice in terms of epistemic objectification, though I will concede that the notion of epistemic othering may offer further helpful resources for understanding how subjects can be harmed by testimonial injustice.
Recent experiments at the JYFLTRAP Penning trap
Authors: Kankainen Anu , Eronen Tommi , Nesterenko Dmitrii , de Roubin Antoine , Vilén Markus
Published: March 2020

The JYFLTRAP double Penning trap mass spectrometer at the Ion Guide Isotope Separator On-Line (IGISOL) facility offers excellent possibilities for high-precision mass measurements of radioactive ions. Around 400 atomic masses, including around 50 isomeric states, have been measured since JYFLTRAP became operational. JYFLTRAP has also been used as a high-resolution mass separator for decay spectroscopy experiments as well as an ion counter for fission yield studies. In this contribution, an overview of recent activities at the JYFLTRAP Penning trap is given, with a focus on nuclei discussed in the PLATAN2019 meeting.
Critical stance within a community of inquiry in an advanced mathematics course for pre-service teachers
Authors: Goodchild Simon , Apkarian Naneh , Rasmussen Chris , Katz Brian
Published: March 2020

This paper reports a study of university students’ experiences of learning mathematics in an introductory differential equations course that takes an inquiry approach to learning and teaching. The students are on a trajectory leading toward a bachelor’s degree in mathematics to be followed by a year-long teacher education credential program. The analysis of students’ end of course presentations and written portfolios is framed with community of practice theory, complemented with analytic categories from community of inquiry, including notions of inquiry stance and critical alignment. Our social theorization of university mathematics education adds a complementary perspective to the more conventional cognitive and discursive analyses and is necessitated by the very nature of inquiry approaches to education. The analysis of students’ presentations and writing leads to exploring their development of the notion of critical stance, which the students are seen to take toward the mathematics, their learning, and approaches to teaching mathematics. We find that the notion of critical stance can be distilled into three components: awareness, self-evaluation, and agency.
A sequential multi-level framework to improve habitat suitability modelling
Authors: Bellamy Chloe , Boughey Katherine , Hawkins Charlotte , Reveley Sonia , Spake Rebecca , Williams Carol , Altringham John
Published: March 2020

Context

Habitat suitability models (HSM) can improve our understanding of a species’ ecology and are valuable tools for informing landscape-scale decisions. We can increase HSM predictive accuracy and derive more realistic conclusions by taking a multi-scale approach. However, this process is often statistically complex and computationally intensive.

Objectives

We provide an easily implemented, flexible framework for sequential multi-level, multi-scale HSM and compare it to two other commonly-applied approaches: single-level, multi-scale HSM and their post-hoc combinations.

Methods

Our framework implements scale optimisation and model tuning at each level in turn, from the highest (population range) to the lowest (e.g. foraging habitat) level, whilst incorporating output habitat suitability indices from a higher level as a predictor. We used MaxEnt and a species of conservation concern in Britain, the lesser horseshoe bat (Rhinolophus hipposideros), to demonstrate and compare multi-scale approaches.

Results

Integrating models across levels, either by applying our framework, or by multiplying single-level model predictions, improved predictive performance over single-level models. Moreover, differences in the importance and direction of the species-environment associations highlight the potential for false inferences from single-level models or their post-hoc combinations. The single-level summer range model incorrectly identified a positive influence of heathland cover, whereas sequential multi-level models made biological sense and underlined this species’ requirement for extensive broadleaf woodland cover, hedgerows and access to buildings for roosting in rural areas.

Conclusions

We conclude that multi-level HSM appear superior to single-level, multi-scale approaches; models should be sequentially integrated across levels if information on species-environment relationships is of importance.
Uniqueness of static, isotropic low-pressure solutions of the Einstein–Vlasov system
Authors: Thaller Maximilian , Harada Tomohiro
Published: March 2020

In Beig and Simon (Commun Math Phys 144:373–390, 1992) the authors prove a uniqueness theorem for static solutions of the Einstein–Euler system which applies to fluid models whose equation of state fulfills certain conditions. In this article it is shown that the result of Beig and Simon (1992) can be applied to isotropic Vlasov matter if the gravitational potential well is shallow. To this end we first show how isotropic Vlasov matter can be described as a perfect fluid giving rise to a barotropic equation of state. This Vlasov equation of state is investigated, and it is shown analytically that the requirements of the uniqueness theorem are met for shallow potential wells. Finally the regime of shallow gravitational potential is investigated by numerical means. An example for a unique static solution is constructed, and it is compared to astrophysical objects like globular clusters. Finally we find numerical indications that solutions with deep potential wells are not unique.
Mission to Planet Earth: The First Two Billion Years
Authors: Stüeken E. E. , Som S. M. , Claire M. , Rugheimer S. , Scherf M. , Sproß L. , Tosi N. , Ueno Y. , Lammer H.
Published: March 2020

Solar radiation and geological processes over the first few million years of Earth’s history, followed soon thereafter by the origin of life, steered our planet towards an evolutionary trajectory of long-lived habitability that ultimately enabled the emergence of complex life. We review the most important conditions and feedbacks over the first 2 billion years of this trajectory, which perhaps represent the best analogue for other habitable worlds in the galaxy. Crucial aspects included: (1) the redox state and volatile content of Earth’s building blocks, which determined the longevity of the magma ocean and its ability to degas H2O and other greenhouse gases, in particular CO2, allowing the condensation of a water ocean; (2) the chemical properties of the resulting degassed mantle, including oxygen fugacity, which would have not only affected its physical properties and thus its ability to recycle volatiles and nutrients via plate tectonics, but also contributed to the timescale of atmospheric oxygenation; (3) the emergence of life, in particular the origin of autotrophy, biological N2fixation, and oxygenic photosynthesis, which accelerated sluggish abiotic processes of transferring some volatiles back into the lithosphere; (4) strong stellar UV radiation on the early Earth, which may have eroded significant amounts of atmospheric volatiles, depending on atmospheric CO2/N2ratios and thus impacted the redox state of the mantle as well as the timing of life’s origin; and (5) evidence of strong photochemical effects on Earth’s sulfur cycle, preserved in the form of mass-independent sulfur isotope fractionation, and potentially linked to fractionation in organic carbon isotopes. The early Earth presents itself as an exoplanet analogue that can be explored through the existing rock record, allowing us to identify atmospheric signatures diagnostic of biological metabolisms that may be detectable on other inhabited planets with next-generation telescopes. We conclude that investigating the development of habitable conditions on terrestrial planets, an inherently complex problem, requires multi-disciplinary collaboration and creative solutions.
Experimental study on high-efficiency polishing for potassium dihydrogen phosphate (KDP) crystal by using two-phase air—water fluid
Authors: Liu Ziyuan , Gao Hang , Guo Dongming
Published: March 2020

A high-efficiency polishing approach using two-phase air—water fluid (TAWF) is proposed to avoid surface contamination and solve the inefficiency of previous water-dissolution polishing techniques for potassium dihydrogen phosphate (KDP) crystal. In the proposed method, controllable deliquescence is implemented without any chemical impurity. The product of deliquescence is then removed by a polishing pad to achieve surface planarization. The mechanism underlying TAWF polishing is analyzed, a special device is built to polish the KDP crystal, and the effect of relative humidity (RH) on polishing performance is studied. The relationship between key parameters of polishing and surface planarization is also investigated. Results show that the polishing performance is improved with increasing RH. However, precisely controlling the RH is extremely difficult during TAWF polishing. Controllable deliquescence can easily be disrupted once the RH fluctuates, which therefore needs to be restricted to a low level to avoid its influence on deliquescence rate. The material removal of TAWF polishing is mainly attributed to the synergistic effect of deliquescence and the polishing pad. Excessive polishing pressure and revolution rate remarkably reduce the life of the polishing pad and the surface quality of the KDP crystal. TAWF polishing using IC-1000 and TEC-168S increase the machining efficiency by 150%, and a smooth surface with a root mean square surface roughness of 5.5 nm is obtained.
Correction to: Wave and Current Effects on Floating Fish Farms
Authors: Faltinsen Odd M. , Shen Yugao
Published: March 2020

The article “Wave and Current Effects on Floating Fish Farms,” written by Odd M. Faltinsen and Yugao Shen, was originally published Online First without Open Access.
Approximate solution for pressure behavior during a multiple rate injectivity test
Authors: Bonafé Maíra Fortes , Braga Arthur , Barreto Abelardo Borges
Published: March 2020

The pressure response during a well test provides important information about reservoir properties, well productivity or reservoir performance. In order to have an option to replace traditional production tests, avoiding the gas flaring and increasing operational safety, injectivity test began to play an important role in the management of reservoirs. Although analytical models are able to describe injection and falloff periods, multiple rate models still need to be developed. This work presents a new formulation to compute pressure response when performing multiple rate injectivity test in a water injection well operating in an oil zone. First, the proposed formulation is compared to injection/falloff models and after a multiple rate scheme is performed. This formulation extends prior models presented in the literature. The accuracy of the proposed solution was assessed by comparison with a numerical simulator. The proposed formulation is also used to determine the reservoir equivalent permeability in any specific period of injection or shut-in.
How to setup a successful transplant program for hemoglobinopathies in developing countries
Authors: Faulkner Lawrence
Published: March 2020

Hematopoietic stem cell transplantation (HSCT) remains the only established definitive cure for severe hemoglobinopathies, such as sickle cell disease (SCD) and thalassemia-the most prevalent life-threatening non-communicable disease of childhood globally. HSCT can not only cure over 85% of children with a compatible sibling but also restore normal health-related quality of life in most cases who do not have major irreversible organ damage at transplant. In low-and middle-income countries (LMICs), particularly in sub-Saharan Africa, SCD carrier rate can be up to 30% and 1% of live births have SCD. Relatively simple and inexpensive measures such as newborn screening, early diagnosis, caregiver education, and timely institution of antipneumococcal prophylaxis and hydroxyurea therapy can substantially reduce SCD-related mortality and morbidity. Improved prevention and early care should proceed in parallel with the development of transplant services and hope for cure. Cure2Children, an Italian NGO, has supported the startup of several bone marrow transplantation programs in LMICs where over 500 transplants have been performed over the last 10 years, with outcomes not substantially different from high-income countries but at a fraction of the cost. This report summarizes this experience and suggests some strategies to set up new HSCT units.
How to increase the role of social workers in suicide preventive interventions
Authors: Levine Joshua , Sher Leo
Published: March 2020

Objective:

Suicide is a serious public health issue that affects individuals, families and societies all over the world. International studies provide consistent evidence that the presence of psychiatrists in a region is associated with lesser suicide rates. However, many psychiatric patients including suicidal patients do not have access to psychiatrists. This indicates that mental health and non-mental health social workers need to be involved in suicide prevention efforts. This paper is the first comprehensive work that discusses how to increase the role of social workers in the area of suicide prevention.

Methods:

A review of the relevant literature.

Results:

Increasing the role of social workers in suicide prevention efforts may reduce suicide risk in groups and people at elevated risk for suicide, as well as the general population.

Conclusion:

Recommendations are provided for how the social work profession can improve upon suicide prevention while incorporating universal, selective and indicated suicide preventive interventions. Social work research efforts should focus on how to increase the role of social workers in suicide prevention and the management of suicidal patients. Social work education programmes should modify their curricula and increase their attention on suicide prevention. Mental health social workers need to educate the patient and their family on suicide risk factors. Furthermore, mental health and non-mental health social workers need to educate the general public on suicide risk factors.
Symbolic threat affects negative self-conscious emotions
Authors: Chen Yujie , Li Longwei , Ybarra Oscar , Zhao Yufang
Published: March 2020

Self-conscious emotions are a distinct category of emotional responses that are rooted in social contexts. Previous findings suggest that negative self-conscious emotions might be elicited by a specific social factor, that is, symbolic intergroup threat. The present study tested the hypothesis that this is true, with three experiments conducted in the Chinese-context. In particular, the Mandarin words for shame (羞愧), guilt (内疚) and loss of face (丢脸) were examined. Symbolic threats were manipulated in all three experiments, with participants randomly divided into a symbolic threat condition and a control condition in each experiment. As expected, participants in the symbolic threat condition always reported more negative self-conscious emotions compared to participants in the control condition. These results suggest that symbolic intergroup threat can lead to self-conscious emotions as well as basic emotions, as was demonstrated by previous research.
COMPOUND-SPECIFIC RADIOCARBON, STABLE CARBON ISOTOPE AND BIOMARKER ANALYSIS OF MIXED MARINE/TERRESTRIAL LIPIDS PRESERVED IN ARCHAEOLOGICAL POTTERY VESSELS
Authors: Casanova Emmanuelle , Knowles Timothy D J , Ford Candice , Cramp Lucy J E , Sharples Niall , Evershed Richard P
Published: March 2020

At archaeological sites located on islands or near the coast, the potential exists for lipid extracts of potsherds to contain fatty acids (FA) from both aquatic and terrestrial organisms, meaning that consideration must be given to marine reservoir effects (MRE) in radiocarbon (14C) analyses. Here we studied the site of Bornais (Outer Hebrides, UK) where a local MRE, ΔR of –65 ± 45 yr was determined through the paired 14C determinations of terrestrial and marine faunal bones. Lipid analysis of 49 potsherds, revealed aquatic biomarkers in 45% of the vessels, and δ13C values of C16:0 and C18:0 FAs revealed ruminant and marine product mixing for 71% of the vessels. Compound-specific 14C analysis (CSRA) of FAs yielded intermediate 14C ages between those of terrestrial and marine bones from the same contexts, confirming an MRE existed. A database containing δ13C values for FAs from reference terrestrial and marine organisms provided endmembers for calculating the percentage marine-derived C (%marine) in FAs. We show that lipid 14C dates can be corrected using determined %marine and ΔR values, such that pottery vessels from coastal locations can be 14C dated by CSRA of FAs.
Female Glass Engravers in the Early Modern Dutch Republic
Authors: van Elk Martine
Published: March 2020

This essay explores glass engravings by Dutch authors Anna Roemers Visscher, Maria Tesselschade Roemers Visscher, and Anna Maria van Schurman. I place these engravings in their rich contemporary contexts, comparing them to other art forms that were the product of female pastime. Like embroidery, emblems, andalba amicorum, engraved glasses combined text and image, transforming each glass into an object that fulfilled key social and cultural functions. Above all, engraving glasses allowed women to forge new self-representations, specifically through their use of play to question binary oppositions and moral certainties.
Validation of saliva and urine use and sampling time on the doubly labelled water method to measure energy expenditure, body composition and water turnover in male and female cats
Authors: Goloni Camila , Peres Francine M. , Senhorello Igor L. S. , Di Santo Ludmilla G. , Mendonça Fernanda S. , Loureiro Bruna A. , Pfrimer Karina , Ferriolli Eduardo , Pereira Gener T. , Carciofi Aulus C.
Published: March 2020

Less invasive protocols are necessary to study energy expenditure (EE) of cats living in homes for expressing their normal living conditions. The present study compared sampling times and the use of saliva, urine and blood to measure2H and18O to apply the doubly labelled water method. In the first study, four cats were used to evaluate the enrichment (2, 4, 6, 7 and 8 h) and elimination (2, 4, 6, 8, 10, 12, 14, 16, 18 and 20 d) of2H and18O (subcutaneously injected). The maximum enrichment was after 5 h (R20·82) of injection, with an Ln linear elimination of both isotopes (P< 0·001;R20·99). The results of EE were similar, regardless of the sampling time used (P= 0·999). In the second study, seven male cats and seven female cats were used. Before and after isotope injection (5 h, 7 d, 10 d and 14 d), blood, saliva and urine were collected. Isotope enrichment was lower in urine (P< 0·05) and at the similar level in blood and saliva. Isotope elimination was similar for all fluids (P< 0·473). The EE calculated with blood and saliva was similar but higher for urine (P= 0·015). According to Bland–Altman statistics, blood and saliva presented low bias and high correlation (P< 0·001), but this was not observed for urine (P= 0·096). Higher EE was observed for male cats (384 (se39) kJ/kg0·67per d) than for female cats (337 (se34) kJ/kg0·67per d;P< 0·05). The sampling time for the method is flexible, and saliva can be used as a substitute for blood.
The use of a portable metabolic monitoring device for measuring RMR in healthy adults
Authors: Yeung Suey S. Y. , Trappenburg Marijke C. , Meskers Carel G. M. , Maier Andrea B. , Reijnierse Esmee M.
Published: March 2020

Objective measurement of RMR may be important for optimal nutritional care but is hindered by the price and practicality of the metabolic monitoring device. This study compared two metabolic monitoring devices for measuring RMR and VO2 and compared the measured RMR with the predicted RMR calculated from equations. RMR was measured using QUARK RMR (reference device) and Fitmate GS (COSMED) in a random order for 30 min, each on fasted participants. In total, sixty-eight adults participated (median age 22 years, interquartile range 21–32). Pearson correlation showed that RMR (r 0·86) and VO2 (r 0·86) were highly correlated between the two devices (P < 0·05). Intraclass correlation coefficients (ICC) showed good relative agreements regarding RMR (ICC = 0·84) and VO2 (ICC = 0·84) (P < 0·05). RMR measured by QUARK RMR was significantly higher (649 (sd 753) kJ/d) than Fitmate GS. Equations significantly overpredicted RMR. Accurate RMR (i.e. within ±10 % of the RMR measured by QUARK RMR) was found among 38 % of the participants for Fitmate GS and among 46–68 % depending on the equations. Bland–Altman analysis showed a low absolute agreement with QUARK RMR at an individual level for both Fitmate GS (limits of agreement (LOA): −828 to +2125 kJ/d) and equations (LOA ranged from −1979 to +1879 kJ/d). In conclusion, both Fitmate GS and predictive equations had low absolute agreements with QUARK RMR at an individual level. Therefore, these limitations should be considered when determining RMR using Fitmate GS or equations.
In Search of Self-Censorship
Authors: Shen Xiaoxiao , Truex Rory
Published: March 2020

Item nonresponse rates across regime assessment questions and nonsensitive items are used to create a self-censorship index, which can be compared across countries, over time and across population subgroups. For many authoritarian systems, citizens do not display higher rates of item nonresponse on regime assessment questions than their counterparts in democracies. This result suggests such questions may not be that sensitive in many places, which in turn raises doubts that authoritarian citizens are widely feigning positive attitudes towards regimes they secretly despise. Higher levels of self-censorship are found under regimes without electoral competition for the executive.
Experimental optimization of the hundred-keV electron source from laser-driven wire target
Authors: Zeng Yushan , Zhou Chuliang , Qi Rong , Li Zhongpeng , Sun Haiyi , Tian Ye , Liu Jiansheng , Xu Zhizhan
Published: March 2020

We present the experimental optimization of electrons in the several hundred keV energy range originated from laser-irradiated wire targets. Accelerated by a femtosecond laser pulse, an electron pulse emitted from the wire target was collimated immediately along the wire to a filter unit for the manipulation of energy and spatial distributions. It is shown in simulation that with a pair of magnets as the filter unit, the optimized electrons could serve as a compact and tunable electron source. The proposed system was demonstrated in a proof-of-principle experiment where we attained 1 fC bunch charge with transverse coherence length approaching 1 nm based on a 0.2 TW laser platform. This indicates the scheme as a promising candidate for single-shot electron diffraction.
Judgesad hocof the International Court of Justice
Authors: Brower Charles N. , Lando Massimo
Published: March 2020

Judgesad hocof the International Court of Justice have been widely criticized for their supposed lack of impartiality. This criticism may seem all the more powerful if one takes into account that judgesad hocwere created as a means to avoid the Court’s bias and appearance of bias. However, recent developments in the appointment of judgesad hocindicate that, far from being a detriment to the states’ perception of the Court’s impartiality, judgesad hocare a means to enhance the perception that the Court as a whole is impartial. Such developments include the increased frequency with which former elected judges are appointed judgesad hoc, the practice of electing judges from the ranks of former (or sitting) judgesad hoc, and the appointment of nationals or non-nationals as judgesad hoc. The institution of judgesad hochas come full circle, and should be regarded as fulfilling the function for which it was created.
Prevalence of Coxiella burnetii in German sheep flocks and evaluation of a novel approach to detect an infection via preputial swabs at herd-level
Authors: Wolf A. , Prüfer T. L. , Schoneberg C. , Campe A. , Runge M. , Ganter M. , Bauer B. U.
Published: March 2020

A prevalence study was conducted on German sheep flocks including goats if they cohabitated with sheep. In addition, a novel approach was applied to identify an infection at the herd-level before lambing season with preputial swabs, suspecting venereal transmission and ensuing colonisation of preputial mucosa with Coxiella (C.) burnetii. Blood samples and genital swabs were collected from breeding males and females after the mating season and were analysed by enzyme-linked immunosorbent assay (ELISA) and quantitative polymerase chain reaction (qPCR) respectively. In total, 3367 animals were sampled across 71 flocks. The true herd-level prevalence adjusted for misclassification probabilities of the applied diagnostic tests using the Rogan-Gladen estimator for the prevalence estimate and a formula by Lang and Reiczigel (2014) for the confidence limits, ranged between 31.3% and 33% (95% confidence interval [95% CI] 17.3–45.5) detected by the ELISA and/or qPCR. Overall 26–36.6% (95% CI 13–56.8) were detected by ELISA, 13.9% (95% CI 4.5–23.2) by the qPCR and 7.9–11.2% (95% CI 0.08–22.3) by both tests simultaneously. The range of results is due to data obtained from literature with different specifications for test quality for ELISA. Among eight farms with females shedding C. burnetii, three farms (37.5%) could also be identified by preputial swabs from breeding sires. This indicates less reliability of preputial swabs if used as a single diagnostic tool to detect C. burnetii infection at the herd-level.
Factors associated with frequent consumption of fast food among Australian secondary school students
Authors: Scully Maree , Morley Belinda , Niven Philippa , Crawford David , Pratt Iain S , Wakefield Melanie ,   for the NaSSDA Study Team
Published: March 2020

Objective:

To examine demographic and behavioural correlates of frequent consumption of fast food among Australian secondary school students and explore the associations between fast food consumption and social/environmental factors.

Design:

Cross-sectional survey using a web-based self-report questionnaire.

Setting:

Secondary schools across all Australian states and territories.

Participants:

Students aged 12–17 years participating in the 2012–2013 National Secondary Students’ Diet and Activity survey (n 8392).

Results:

Overall, 38 % of students surveyed reported consuming fast food at least weekly. Being male, residing in lower socio-economic areas and metropolitan locations, having more weekly spending money and working at a fast food outlet were all independently associated with consuming fast food once a week or more, as were several unhealthy eating (low vegetable intake and high sugary drink and snack food intake) and leisure (low physical activity and higher commercial television viewing) behaviours and short sleep duration. Frequent fast food consumption and measured weight status were unrelated. Students who agreed they go to fast food outlets with their family and friends were more likely to report consuming fast food at least weekly, as were those who usually ‘upsize’ their fast food meals and believe fast food is good value for money.

Conclusions:

These results suggest that frequent fast food consumption clusters with other unhealthy behaviours. Policy and educational interventions that reach identified at-risk groups are needed to reduce adolescent fast food consumption at the population level. Policies placing restrictions on the portion sizes of fast food may also help adolescents limit their intake.