bluuebunny/crossref_metadata_2025 huggingface dataset:
Further investigation on solant–rectenna‐based flexible Hilbert‐shaped metamaterials
Authors: Elwi Taha A. , Abdulqader Sarah G.
Published: June 2020

This study discusses the design of a low‐profile metamaterial‐based antenna consisting of a 3 × 5 array of Hilbert shaped unit cells organised as a rectangular patch. The antenna is backed by with a partial ground plane loaded with square electromagnetic band gap defects for energy harvesting applications in the context of ultra‐wideband self‐powered wearable wireless devices. The antenna is mounted on a 28 × 32 mm FR4 substrate, with a thickness of 0.394 mm, a relative permittivity of 4.2 and a loss tangent of 0.02. The antenna is also printed on a flexible solar panel for self‐powered devices through solant–rectenna output terminals. The proposed solant–rectenna is found to cover the frequency range from 0.8 up to 10 GHz. The I–V characteristics of the solar panel are measured with and without the antenna structure to realize low shadowing effects. After that, the solant radiofrequency (RF) port is connected to a rectifier circuit to create a rectenna port that collects the RF energy and converts it to an output DC voltage at 0.915 GHz. It is found that the proposed rectenna provides an output DC voltage of 1.42 V with a conversion efficiency of 90%.
Evolved massive stars at low metallicity
Authors: Yang Ming , Bonanos Alceste Z. , Jiang Bi-Wei , Gao Jian , Gavras Panagiotis , Maravelias Grigoris , Wang Shu , Chen Xiao-Dian , Tramper Frank , Ren Yi , Spetsieri Zoi T. , Xue Meng-Yao
Published: June 2020

We present the most comprehensive red supergiant (RSG) sample for the Small Magellanic Cloud (SMC) to date, including 1239 RSG candidates. The initial sample was derived based on a source catalog for the SMC with conservative ranking. Additional spectroscopic RSGs were retrieved from the literature, and RSG candidates were selected based on the inspection of Gaia and 2MASS color-magnitude diagrams (CMDs). We estimate that there are in total ∼1800 or more RSGs in the SMC. We purify the sample by studying the infrared CMDs and the variability of the objects, though there is still an ambiguity between asymptotic giant branch stars (AGBs) and RSGs at the red end of our sample. One heavily obscured target was identified based on multiple near-IR and mid-IR (MIR) CMDs. The investigation of color-color diagrams shows that there are fewer RSGs candidates (∼4%) showing PAH emission features compared to the Milky Way and LMC (∼15%). The MIR variability of RSG sample increases with luminosity. We separate the RSG sample into two subsamples (risky and safe), and identify one M5e AGB star in the risky subsample based on simultaneous inspection of variabilities, luminosities, and colors. The degeneracy of mass loss rate (MLR), variability, and luminosity of the RSG sample is discussed, indicating that most of the targets with high variability are also the bright ones with high MLR. Some targets show excessive dust emission, which may be related to previous episodic mass loss events. We also roughly estimate the total gas and dust budget produced by entire RSG population as ∼1.9−1.1+2.4 × 10−6 M⊙ yr−1 in the most conservative case, according to the derived MLR from IRAC1–IRAC4 color. Based on the MIST models, we derive a linear relation between Teff and observed J − KS color with reddening correction for the RSG sample. By using a constant bolometric correction and this relation, the Geneva evolutionary model is compared with our RSG sample, showing a good agreement and a lower initial mass limit of ∼7 M⊙ for the RSG population. Finally, we compare the RSG sample in the SMC and the LMC. Despite the incompleteness of LMC sample in the faint end, the result indicates that the LMC sample always shows redder color (except for the IRAC1–IRAC2 and WISE1–WISE2 colors due to CO absorption) and higher variability than the SMC sample, which is likely due to a positive relation between MLR, variability and the metallicity.
Photometric detection of internal gravity waves in upper main-sequence stars
Authors: Bowman D. M. , Burssens S. , Simón-Díaz S. , Edelmann P. V. F. , Rogers T. M. , Horst L. , Röpke F. K. , Aerts C.
Published: June 2020

Context. Massive stars are predicted to excite internal gravity waves (IGWs) by turbulent core convection and from turbulent pressure fluctuations in their near-surface layers. These IGWs are extremely efficient at transporting angular momentum and chemical species within stellar interiors, but they remain largely unconstrained observationally.

Aims. We aim to characterise the photometric detection of IGWs across a large number of O and early-B stars in the Hertzsprung–Russell diagram, and explain the ubiquitous detection of stochastic variability in the photospheres of massive stars.

Methods. We combined high-precision time-series photometry from the NASA Transiting Exoplanet Survey Satellite with high-resolution ground-based spectroscopy of 70 stars with spectral types O and B to probe the relationship between the photometric signatures of IGWs and parameters such as spectroscopic mass, luminosity, and macroturbulence.

Results. A relationship is found between the location of a star in the spectroscopic Hertzsprung–Russell diagram and the amplitudes and frequencies of stochastic photometric variability in the light curves of massive stars. Furthermore, the properties of the stochastic variability are statistically correlated with macroturbulent velocity broadening in the spectral lines of massive stars.

Conclusions. The common ensemble morphology for the stochastic low-frequency variability detected in space photometry and its relationship to macroturbulence is strong evidence for IGWs in massive stars, since these types of waves are unique in providing the dominant tangential velocity field required to explain the observed spectroscopy.
Ongoing flyby in the young multiple system UX Tauri
Authors: Ménard F. , Cuello N. , Ginski C. , van der Plas G. , Villenave M. , Gonzalez J.-F. , Pinte C. , Benisty M. , Boccaletti A. , Price D. J. , Boehler Y. , Chripko S. , de Boer J. , Dominik C. , Garufi A. , Gratton R. , Hagelberg J. , Henning Th. , Langlois M. , Maire A. L. , Pinilla P. , Ruane G. J. , Schmid H. M. , van Holstein R. G. , Vigan A. , Zurlo A. , Hubin N. , Pavlov A. , Rochat S. , Sauvage J.-F. , Stadler E.
Published: June 2020

We present observations of the young multiple system UX Tauri to look for circumstellar disks and for signs of dynamical interactions. We obtained SPHERE/IRDIS deep differential polarization images in the J and H bands. We also used ALMA archival CO data. Large extended spirals are well detected in scattered light coming out of the disk of UX Tau A. The southern spiral forms a bridge between UX Tau A and C. These spirals, including the bridge connecting the two stars, all have a CO (3–2) counterpart seen by ALMA. The disk of UX Tau C is detected in scattered light. It is much smaller than the disk of UX Tau A and has a major axis along a different position angle, suggesting a misalignment. We performed PHANTOM SPH hydrodynamical models to interpret the data. The scattered light spirals, CO emission spirals and velocity patterns of the rotating disks, and the compactness of the disk of UX Tau C all point to a scenario in which UX Tau A has been perturbed very recently (∼1000 years) by the close passage of UX Tau C.
Statistical data analysis in the Wasserstein space
Authors: Bigot Jérémie
Published: June 2020

This paper is concerned by statistical inference problems from a data set whose elements may be modeled as random probability measures such as multiple histograms or point clouds. We propose to review recent contributions in statistics on the use of Wasserstein distances and tools from optimal transport to analyse such data. In particular, we highlight the benefits of using the notions of barycenter and geodesic PCA in the Wasserstein space for the purpose of learning the principal modes of geometric variation in a dataset. In this setting, we discuss existing works and we present some research perspectives related to the emerging field of statistical optimal transport.
Entwicklung einer deutschen Telefonversion des IQCODE (Informant Questionnaire on Cognitive Decline in the Elderly) innerhalb einer Kohorte von Angehörigen von Patienten nach ischämischem Schlaganfall
Authors: Engelhardt Sabrina , Wiedmann Silke , Rücker Viktoria , Kraft Peter , Mackenrodt Daniel , Malzahn Uwe , Störk Stefan , Kleinschnitz Christoph , Heuschmann Peter
Published: June 2020

Hintergrund Eine validierte telefonische Fassung der deutschen Version des Fragebogens „Informant Questionnaire on Cognitive Decline in the Elderly“ (IQCODE) zur Erfassung kognitiver Veränderungen von Schlaganfall-Patienten über einen Zeitraum von 10 Jahren vor Schlaganfall durch Befragung Angehöriger liegt bislang nicht vor. Eine deutsche telefonische Kurzversion existiert ebenfalls nicht.

Methoden 60 Angehörige von 60 Patientinnen und Patienten mit ischämischem Schlaganfall wurden mit der persönlichen und der telefonischen 26-Item-Version des IQCODE in randomisierter Reihenfolge befragt. Als Maß zur Quantifizierung der Reliabilität beider IQCODE-Versionen wurde ein gewichtetes Kappa berechnet (Fleiss-Cohen Gewichte). Mithilfe von Varianzinflationsfaktoren wurde eine telefonische Kurzversion des IQCODE entwickelt und diese Version mit der 26-Item-Telefonversion mittels Spearman‘s Korrelationskoeffizienten verglichen.

Ergebnisse Das gewichtete Kappa der telefonischen Befragung gegenüber der persönlichen betrug 0,84 (95 % Konfidenzintervall 0,72–0,97). Die neu entwickelte Kurzversion des telefonbasierten IQCODE umfasste 10 Items. Der Korrelationskoeffizient zwischen der Kurz- und der Langversion betrug 0,97 (95 % Konfidenzintervall 0,96–0,99).

Schlussfolgerung Die telefonische Version des deutschsprachigen 26-Item IQCODE zeigte im Vergleich zur persönlichen Befragung exzellente Übereinstimmungswerte. Die telefonische 10-Item-Kurzversion zeigte eine exzellente Übereinstimmung mit der telefonischen Langversion. Somit stehen nun auch für den deutschen Sprachraum vereinfachte Werkzeuge für die effiziente Befragung großer Kollektive zur Verfügung.
Pancreatic Neuroendocrine Neoplasm Associated with a Familial MAX Deletion
Authors: Petignot Sandrine , Daly Adrian F. , Castermans Emilie , Korpershoek Esther , Scagnol Irène , Beckers Pablo , Dideberg Vinciane , Rohmer Vincent , Bours Vincent , Beckers Albert
Published: June 2020

Most pancreatic neuroendocrine neoplasms (pNEN) occur sporadically but they
can also occur as part of multiple endocrine neoplasia type 1 (MEN1).
MAX was originally described as an inherited
pheochromocytoma-paraganglioma risk gene, but also has recently been
implicated in pituitary tumorigenesis. Here we describe the first case of a
pNEN associated with an inherited MAX gene deletion in a family with
endocrine tumors. The patient was a male carrier of an intragenic exon 3
deletion inherited from his father who had recurrent pheochromocytomas and a
macroprolactinoma. The patient underwent screening and hormonal studies but
no pheochromocytoma-paraganglioma, pituitary or renal tumors were
identified. However, abdominal magnetic resonance imaging (MRI) identified a
1 cm lesion in body of the pancreas. The lesion was hyperintense on
T2-weighted signal, and there was hyperfixation of the tumor on 68Ga-DOTANOC
PET-CT images. No biochemical evidence of pancreatic hormone excess was
identified. Following a guided biopsy, a pathological diagnosis of a low
grade pNEN was made and immunohistochemistry showed loss of MAX nuclear
staining. Genetic analysis of the tumor tissue indicated copy number neutral
loss of heterozygosity consistent with uniparental disomy. This is the first
reported case of a MAX deletion associated pNEN and strengthens the
argument that MAX may represent an inheritable multiple endocrine
neoplasia risk gene. Further analysis of germline and somatic MAX
mutations/deletions in large cohorts of unexplained NEN cases could
help clarify the potential role of MAX in NEN etiology.
Nucleophilic Cyclization/Electrophilic Substitution of (2,2-Dialkoxyethyl)ureas: Highly Regioselective Access to Novel 4-(Het)arylimidazolidinones and Benzo[d][1,3]diazepinones
Authors: Smolobochkin Andrey V. , Gazizov Almir S. , Otegen Nazerke K. , Voronina Julia K. , Strelnik Anna G. , Samigullina Aida I. , Burilov Alexander R. , Pudovik Michail A.
Published: June 2020

Imidazolidin-2-one and 1,3-benzodiazepin-2-one scaffolds are structural motifs of many biologically active compounds. Herein, we report a highly regioselective acid-catalyzed intramolecular nucleophilic cyclization/intermolecular electrophilic substitution reaction sequence of (2,2-dialkoxyethyl)ureas. The reaction benefits from readily available starting materials, a simple workup procedure, moderate to high yields of target compounds, and provides a convenient entry to previously unknown 4-(het)arylimidazolidinones and 5-(het)arylbenzodiazepinones. The proposed mechanism of the reaction is also discussed.
Factors Associated with Formula Feeding among Late Preterm Neonates
Authors: Fishel Bartal Michal , Chen Han-Yang , Blackwell Sean C. , Chauhan Suneet P. , Sibai Baha M.
Published: June 2020

Objective Late preterm births (delivery at 34–36 weeks) account for nearly three quarters of the preterm births and among them there is a knowledge gap about an important aspect of infant care: breast versus formula feeding. The aim of this study was to assess factors associated with formula feeding in late preterm neonates.

Study Design Secondary analysis of a multicenter randomized trial of antenatal corticosteroids for women at risk for late preterm birth. All women with a singleton pregnancy who delivered at 340/7 to 366/7 weeks were included. Women with no information on neonatal feeding or known fetal anomalies were excluded. The outcome evaluated was the type of neonatal feeding during hospital stay. Maternal and neonatal characteristics were compared among women who initiated breast versus formula feeding. Adjusted relative risks (aRRs) for formula feeding with 95% confidence intervals (CIs) were calculated.

Results Of the 2,831 women in the parent trial, 2,329 (82%) women met inclusion criteria and among them, 696 (30%) were formula feeding. After multivariable regression, the following characteristics were associated with an increased risk of formula feeding: maternal age < 20 years (aRR: 1.47, 95% CI: 1.20–1.80) or ≥35 years (aRR: 1.19, 95% CI: 1.02–1.40), never married status (aRR: 1.39, 95% CI: 1.20–1.60), government-assisted insurance (aRR: 1.41, 95% CI: 1.16–1.70), chronic hypertension (aRR: 1.19, 95% CI: 1.01–1.40), smoking (aRR: 1.51, 95% CI: 1.31–1.74), cesarean delivery (aRR: 1.16, 95% CI: 1.03–1.32), and admission to neonatal intensive care unit (aRR: 1.31, 95% CI: 1.16–1.48). Hispanic ethnicity (aRR: 0.78, 95% CI: 0.64–0.94), education >12 years (aRR: 0.81, 95% CI 0.69–0.96), and nulliparity (aRR 0.71, 95% CI: 0.62–0.82) were associated with a reduced risk for formula feeding.

Conclusion In this geographically diverse cohort of high-risk deliveries, 3 out 10 late preterm newborns were formula fed. Smoking cessation was a modifiable risk factor that may diminish the rate of formula feeding among late preterm births.

Key Points
Pregnancy Outcomes after Preeclampsia: The Effects of Interpregnancy Weight Change
Authors: Tabet Maya , Banna Soumya , Luong Lan , Kirby Russell , Chang Jen Jen
Published: June 2020

Objective This study aimed to examine the effects of interpregnancy weight change on pregnancy outcomes, including recurrent preeclampsia, preterm birth, small-for-gestational age (SGA), large-for-gestational age (LGA), and cesarean delivery, among women with a history of preeclampsia. We also evaluated whether these associations were modified by prepregnancy body mass index (BMI) category in the first pregnancy (BMI < 25 vs. ≥25 kg/m2) and if associations were present among women who maintained a healthy BMI category in both pregnancies.

Study Design We conducted a population-based retrospective cohort study including 15,108 women who delivered their first two nonanomalous singleton live births in Missouri (1989–2005) and experienced preeclampsia in the first pregnancy. We performed Poisson regression with robust error variance to estimate relative risks and 95% confidence intervals for outcomes of interest after controlling for potential confounders.

Results Interpregnancy weight gain was associated with increased risk of recurrent preeclampsia, LGA, and cesarean delivery. These risks increased in a “dose–response” manner with increasing magnitude of interpregnancy weight gain and were generally more pronounced among women who were underweight or normal weight in the first pregnancy. Interpregnancy weight loss exceeding 1 BMI unit was associated with increased risk of SGA among underweight and normal weight women, while interpregnancy weight loss exceeding 2 BMI units was associated with reduced risk of recurrent preeclampsia among overweight and obese women.

Conclusion Even small changes in interpregnancy weight may significantly affect pregnancy outcomes among formerly preeclamptic women. Appropriate weight management between pregnancies has the potential to attenuate such risks.

Key Points
Unilateral Dyshidrosiform Pemphigus Vulgaris
Authors: Daroach Manju , De Dipankar , Handa Sanjeev , Mahajan Rahul , Vishwajeet Vikarn , Saikia Uma N.
Published: June 2020

Abstarct

Pemphigus vulgaris is an autoimmune disease characterized by fluid-filled blisters over body and mucosal surfaces. Localized pemphigus is a rare presentation of the disease. There are few reports of localized pemphigus in literature presenting as esophageal involvement, recurrent paronychia, conjunctival mass, foot ulcers, discoloration of toes with hyperkeratotic skin lesions, verrucous lesions, and dyshidrosiform pemphigus vulgaris. We present a case of dyshidrosiform pemphigus involving a foot following trauma. Histopathology and direct immunofluorescence confirmed our diagnosis. In our patient, the disease started as localized dyshidrosiform pemphigus and later became generalized. This unusual presentation led to a delay in diagnosis and proper treatment in this patient. Physicians should be aware of such rare presentations to aid in the timely diagnosis and management of such patients.
MEMS blazed gratings fabricated using anisotropic etching and oxidation sharpening
Authors: Nie Qiuyu , Xie Yiyuan , Chang Fei
Published: June 2020

Micro-electro-mechanical system (MEMS) blazed gratings are the critical optical elements in high resolution micro-spectrometer systems. The MEMS blazed gratings fabricated by conventional methods are not ideal saw-tooth profiles. After the photolithographic and anisotropic etching process, a tiny platform of silicon will be left on the top of the grating groove because of the silica mask, which will lead to amounts of stray light and reduce the diffraction efficiency of gratings. This paper presents a novel design and fabrication method for fabricating MEMS blazed grating, which utilizes off-cut silicon (111) wafers. The blazed angle of gratings is revised from 7.54° to 8.0° according to the tiny platform width on the top of grating grooves. In the procedure of grating fabrication, the oxidation sharpening method is used to cut down the width of the tiny platform. The experimental result shows that the platform width of the grating groove has sharpened from 1000 nm to 540 nm, and the fabricated blazed grating has high diffraction efficiency. The result indicates that the process to fabricate blazed gratings through the anisotropic etching and oxidation sharpening technology is quite effective.
Superconductivity of alkali-metal intercalated BC2
Authors: Hayami Wataru , Tanaka Takaho
Published: June 2020

The superconductivity of alkali-metal intercalated BC2, MxBC2 (M = Li, Na, and K; x = 0.5–1.5), has been studied using first-principles calculations. The calculated critical temperature (Tc) values are substantially high at x = 0.5 (49.8–57.1 K), which are higher than those for MgB2 and close to those predicted for LixByCz compounds. The Tc values at x = 1.5 are comparatively low (0.6–5.6 K) and close to those for graphite intercalation compounds. No superconductivity is observed at x = 1.0 for all alkali metals. An analysis of the electronic structures reveals that at x = 0.5, the state at the Fermi energy includes the σ bond character. In contrast, at x = 1.5, the state includes only π bonds comprising pz orbitals of B and C atoms. The σ bond character is essential for attaining high Tc values because the σ bond couples strongly with the bending-like phonon modes of the BC2 layer. However, the π bond couples weakly with the stretching-like phonon modes due to the small overlap of the pz orbitals, which results in a relatively low Tc for the material.
Soliton dynamics for quantum systems with higher-order dispersion and nonlinear interaction
Authors: Chen Chen , Pan Yuqi , Guo Jiyuan , Wang Ying , Gao Guojun , Wang Wei
Published: June 2020

We investigated three-dimensional quantum systems with higher-order dispersion and nonlinear effects. The systems’ soliton dynamics is studied based on the (3+1)-dimensional higher-order nonlinear Schrödinger equation (NLSE). Based on the self-similar approach and the bright soliton-type solution of the (1+1)-dimensional NLSE, we derived the analytical bright soliton solution for the (3+1)-dimensional NLSE with higher-order dispersion and nonlinear effects, with the typical soliton feature pictorially demonstrated. Our study illustrates that a higher-dimensional medium with higher-order dispersion and nonlinear effects supports soliton behavior. This demonstrates the applicability of the theoretical treatment presented in this work.
Diamond avalanche diodes for obtaining high-voltage pulse with subnanosecond front edge
Authors: Liu Zhangcheng , Yi Wenyang , Zhao Dan , Abbasi Haris Naeem , Min Tai , Wang Hong-Xing
Published: June 2020

In this Letter, we report on demonstrating diamond avalanche diodes for obtaining a high-voltage pulse with a subnanosecond front edge. Under a 2.5 kV driving pulse, the diamond avalanche diodes show a 2.04 kV output and the front edge is 0.894 ns. After repetitive tests, the output voltage wave remains almost the same, indicating good stability. By applying a reverse DC 100 V bias, the front edge shortens to be 0.675 ns, while the rectifier characteristics degrade and the output voltage is limited. Therefore, the reverse bias should be optimized to obtain both the fast front edge and high output voltage. The results show that diamond avalanche diodes have a promising application for high-voltage pulse sources.
Probing the surface activity of hydroxyapatite nanoparticles through their interaction with water molecules
Authors: Wang Xia , Wu Hong , Cheng Xiajie , Yang Mingli , Zhang Li
Published: June 2020

Hydroxyapatite nanoparticles (nano-HAPs) are often used to promote the performance of various biomaterials, but their surface activity can be hardly evaluated directly. An indirect approach of using water molecules as a probe to measure the surface activity of nano-HAPs is proposed in this work. The interaction of nano-HAPs with their surrounding water molecules is studied by using a two-step simulation for the isothermal–isobaric and canonical ensembles successively. A part of water molecules forms a dense and structured layer around the particle, while the remaining molecules are in a disordered state. The particles annealed under high temperature show a lower activity toward water than the corresponding unannealed ones. Moreover, the small-sized particles possess greater interaction energy with water molecules than the large-sized particles, which indirectly reflects the higher activity of small-sized HAPs. Our computations not only suggest a new approach to study the surface activity of nanoparticles but also address the structure–activity relationship of nano-HAPs, which would be useful for regulating the surface activity of HAP-based biomaterials.
Isotopes of alternative algebras of characteristic different from
Authors: Pchelintsev S. V.
Published: June 2020

We study homotopes of alternative algebras over an algebraically closed field of characteristic different from

. We prove an analogue of Albert’s theorem on isotopes of associative algebras: in the class of finite-dimensional unital alternative algebras every isotopy is an isomorphism. We also prove that every

-homotope of a unital alternative algebra preserves the identities of the original algebra. We also obtain results on the structure of isotopes of various simple algebras, in particular, Cayley–Dixon algebras.
Qualitative exploration of barriers to alcohol management in patients with chronic disease in a regional setting
Authors: Mudd Julie , Preston Robyn , Larkins Sarah
Published: June 2020

Chronic diseases are a major contributor to the burden of disease in Australia. Alcohol consumption is similar in people with chronic disease and the general public, and may contribute to management challenges. In regional Australia, there are limited options for the management of excess alcohol consumption, so most of this burden falls to general practitioners. This study explored how staff in general practices are managing alcohol in patients with chronic disease with a view to determining what additional services may be appropriate. Brief interviews were conducted with doctors, nurses and allied health practitioners across three general practices in a regional centre. Interviews were analysed using abductive thematic techniques to elicit broad themes. In all, 18 interviews were conducted. All interviewees found the management of patients with chronic disease who were drinking in excess of guidelines to be challenging. The complexity of patients, in terms of health needs and social circumstances, affected management and self-care. Australian drinking cultural norms also affected patients’ and practitioners’ behaviour. Multidisciplinary care was highlighted by all health professionals; however, there were challenges maintaining staff motivation, a lack of training in alcohol management and a lack of referral or assistance services. Experienced practitioners identified that the patient was the key stakeholder who needed to take ownership of their health. The combined burden of excess alcohol consumption and chronic disease is a common management challenge faced by staff in general practice. Although there was evidence of awareness of the issue and a concerted effort to address the problem, most staff felt they had inadequate training, skills and resources. More undergraduate or postgraduate training in alcohol management and more resources are required to support general practitioners in this area.
Linking phosphorus sorption and magnetic susceptibility in clays and tropical soils
Authors: Poggere G. C. , Barrón V. , Inda A. V. , Barbosa J. Z. , Brito A. D. B. , Curi N.
Published: June 2020

Maghemite (Mh) and magnetic susceptibility have been little studied in relation to phosphorus (P) sorption, despite the fact that tropical soils – particularly those derived from mafic rocks – may contain substantial amounts of this iron oxide. In this work, we investigated the relationship between P adsorption and magnetic susceptibility in tropical soils, and determined the maximum adsorption capacity of P (MACP) and P desorption in seven pedogenic clays from magnetic soils with contrasting parent materials and three synthetic Mh samples. Considering the heterogeneity of the soil dataset in this study, the exclusive adoption of magnetic susceptibility as an indicator of P adsorption potential in soil remains uncertain. The relationship between magnetic susceptibility and adsorbed P was more evident in the B horizon of red soils from basic igneous rocks. In this group, soils with magnetic susceptibility above 20 × 10−6 m3 kg−1 had high adsorbed P. Although the pedogenic clays exhibited lower MACP values (1353–2570 mg kg–1) than the synthetic Mh samples (3786–4321 mg kg–1), P desorption exhibited the opposite trend (~14% vs ~8%). The substantial P adsorption capacity of synthetic Mh confirmed the adsorption data for pedogenic clays, which were strongly influenced by magnetic susceptibility, Mh and gibbsite contents, and specific surface area.
Pre-eradication assessment of feral cat density and population size across Kangaroo Island, South Australia
Authors: Hohnen Rosemary , Berris Karleah , Hodgens Pat , Mulvaney Josh , Florence Brenton , Murphy Brett P. , Legge Sarah M. , Dickman Chris R. , Woinarski John C. Z.
Published: June 2020

Abstract
Context Feral cats (Felis catus) are a significant threat to wildlife in Australia and globally. In Australia, densities of feral cats vary across the continent and also between the mainland and offshore islands. Densities on small islands may be at least an order of magnitude higher than those in adjacent mainland areas. To provide cat-free havens for biodiversity, cat-control and eradication programs are increasingly occurring on Australian offshore islands. However, planning such eradications is difficult, particularly on large islands where cat densities could vary considerably.
Aims In the present study, we examined how feral cat densities vary among three habitats on Kangaroo Island, a large Australian offshore island for which feral cat eradication is planned.
Methods Densities were compared among the following three broad habitat types: forest, forest–farmland boundaries and farmland. To detect cats, three remote-camera arrays were deployed in each habitat type, and density around each array was calculated using a spatially explicit capture–recapture framework.
Key results The average feral cat density on Kangaroo Island (0.37 cats km−2) was slightly higher than that on the Australian mainland. Densities varied from 0.06 to 3.27 cats km−2 and were inconsistent within broad habitat types. Densities were highest on farms that had a high availability of macropod and sheep carcasses. The relationship between cat density and the proportion of cleared land in the surrounding area was weak. The total feral cat population of Kangaroo Island was estimated at 1629±661 (mean±s.e.) individuals.
Conclusions Cat densities on Kangaroo Island are highly variable and may be locally affected by factors such as prey and carrion availability.
Implications For cat eradication to be successful, resources must be sufficient to control at least the average cat density (0.37 cats km−2), with additional effort around areas of high carcass availability (where cats are likely to be at a higher density) potentially also being required.
Distribution and diet of feral cats (Felis catus) in the Wet Tropics of north-eastern Australia, with a focus on the upland rainforest
Authors: Rowland Jesse , Hoskin Conrad J. , Burnett Scott
Published: June 2020

Abstract
ContextFeral cats have been identified as a key threat to Australia’s biodiversity, particularly in arid areas and tropical woodlands. Their presence, abundance and potential impacts in rainforest have received less attention.
AimsTo investigate the distribution and diet of feral cats (Felis catus) in upland rainforest of the Wet Tropics.
MethodsWe collated available occurrence records from the Wet Tropics, and data from upland camera-trapping surveys over an 8-year period, to assess geographic and elevational distribution of feral cats in the bioregion. We also assessed the diet of feral cats from scats collected at upland sites.
Key resultsFeral cats are widespread through the Wet Tropics bioregion, from the lowlands to the peaks of the highest mountains (>1600m), and in all vegetation types. Abundance appears to vary greatly across the region. Cats were readily detected during camera-trap surveys in some upland rainforest areas (particularly in the southern Atherton Tablelands and Bellenden Ker Range), but were never recorded in some areas (Thornton Peak, the upland rainforest of Windsor Tableland and Danbulla National Park) despite numerous repeated camera-trap surveys over the past 8 years at some of these sites. Scat analysis suggested that small mammals comprise ~70% of the diet of feral cats at an upland rainforest site. Multivariate analysis could not detect a difference in mammal community at sites where cats were detected or not.
ConclusionsFeral cats are widespread in the Wet Tropics and appear to be common in some upland areas. However, their presence and abundance are variable across the region, and the drivers of this variability are not resolved. Small mammals appear to be the primary prey in the rainforest, although the impacts of cats on the endemic and threatened fauna of the Wet Tropics is unknown.
ImplicationsGiven their documented impact in some ecosystems, research is required to examine the potential impact of cats on Wet Tropics fauna, particularly the many upland endemic vertebrates. Studies are needed on (1) habitat and prey selection, (2) population dynamics, and (3) landscape source–sink dynamics of feral cats in the Wet Tropics.
Assessment of plastic damage in high strength structural steel using electromagnetic technique
Authors: Wang Xiao , Chen Jian-Guo , Li Jia-Qing
Published: June 2020

High strength structural (HSS) steels are widely used in many construction equipment and infrastructures. Currently, there is a substantial demand of Non-Destructive Testing of these steel structures. In this research, the electromagnetic technique was utilised to assess the plastic damage in a typical HSS steel (i.e. Q690 steel). The results showed that the magnetic hysteresis loop of this material changed apparently after the tensile deformation, and the relevant magnetic parameters such as coercivity, remanence, and maximum permeability were sensitive to the cumulative plastic strain. The results demonstrated that there is a good coherence between the plastic damage evolution and the magnetic parameters variation, which indicated that the electromagnetic technique is an effective method to assess the plastic damage of HSS steel.
Linkages of flow regime and micro-topography: prediction for non-native mangrove invasion under sea-level rise
Authors: Chen Luzhen , Feng Hongyu , Gu Xiaoxuan , Dong Ying , Cheng Peng , Guo Xudong , Lin Qiulian , Tang Ting , Zhang Yihui , Zhu Xudong , Yang Shengchang
Published: June 2020

Flow regime is a key driver of invasive aquatic organisms, and the invasiveness of mangrove species may be simultaneously attributed to plant traits and flowing hydrological conditions at the estuary scale. We focused on hydrological and topographic conditions for a non-native mangrove species,
Sonneratia apetala
, in Zhangjiang Estuary of Fujian, China. A hydrological model and a micro-topographic model were used to predict its dispersal and early establishment, and field surveys and simulated experiments were integrated to estimate its future dispersal patterns. The mesohaline mudflat with a salinity of 8 ~ 10 PSU at the mangrove seaward edge was the most likely colonization area for
S. apetala
under current conditions. The south-western region of the estuary with native mangroves was the most likely area for its colonization according to the unstructured-grid finite-volume community ocean model (FVCOM) in September, when the largest tidal currents within a year and the maximum fruit maturity period occur. Approximately 42% of the mudflats throughout the whole estuary may be available for seedling establishment under the future sea-level rise RCP 4.5 scenarios compared with 44% for current establishment; however, the RCP 8.5 scenarios would significantly decrease seedling establishment by 2100 due to serious tidal inundation according to the micro-topographical model.
Coupling of translation quality control and mRNA targeting to stress granules
Authors: Moon Stephanie L. , Morisaki Tatsuya , Stasevich Timothy J. , Parker Roy
Published: June 2020

Stress granules are dynamic assemblies of proteins and nontranslating RNAs that form when translation is inhibited in response to diverse stresses. Defects in ubiquitin–proteasome system factors including valosin-containing protein (VCP) and the proteasome impact the kinetics of stress granule induction and dissolution as well as being implicated in neuropathogenesis. However, the impacts of dysregulated proteostasis on mRNA regulation and stress granules are not well understood. Using single mRNA imaging, we discovered ribosomes stall on some mRNAs during arsenite stress, and the release of transcripts from stalled ribosomes for their partitioning into stress granules requires the activities of VCP, components of the ribosome-associated quality control (RQC) complex, and the proteasome. This is an unexpected contribution of the RQC system in releasing mRNAs from translation under stress, thus identifying a new type of stress-activated RQC (saRQC) distinct from canonical RQC pathways in mRNA substrates, cellular context, and mRNA fate.
Facile synthesis of N,B-co-doped carbon dots with the gram-scale yield for detection of iron (III) and E. coli
Authors: Zhang Lixia , Zhang Zishu , Gao Zhiwen , Xie Yan , Shu Shuang , Ke Yuee , Wang Yu , Deng Bin , Yu Ruijin , Geng Huiling
Published: June 2020

A simple method was developed to prepare fluorescent nitrogen/boron-doped carbon dots (N,B-CDs) in the gram scale. The results showed that the CDs exhibited blue photoluminescence (PL) under 365 nm ultraviolet radiation and excitation-dependent emission. Heteroatoms entered the CDs to enhance the photochemical properties, and their positive properties can be attributed to the presence of guanidino group and functionalized with boronic acid for realizing their utilization in certain applications. These materials could be applied to monitor Fe3+ via static PL quenching, yielding a limit of detection (LOD) of 0.74 μM. Furthermore, the charged and boronic acid groups on the prepared N,B-CDs enabled their use as recognition elements to bind with the bacteria through electrostatic interaction and allowed covalent interactions to form the corresponding boronate ester with E. coli (E. coli) bacterial membrane. This method could satisfy a linear range of 102–107 with LOD of 165 cfu ml−1 for E. coli. This method was applied for the determination of E. coli in tap water and orange juice samples, and satisfactory results were obtained.
Students mathematical representation of Hatyaiwittayalaisomboonkulkanya School Thailand based on SOLO Taxonomy in solving PISA problem
Authors: Trapsilasiwi D , Murtikusuma R P , Pambudi D S , Oktavianingtyas E , Fauziyah M E
Published: June 2020

This research aims to describe mathematical representation ability of Hatyaiwittayalaisomboonkulkanya School students based on SOLO taxonomy in solving PISA problem especially change and relationship content. Data were analyzed through descriptive method with qualitative approach. Data were collected through a test using PISA problem and semi-structural interview. Test was given to Mattayom 4 students with 15-year-old average age. The result of this study showed that students with multi-structural and relational level tend to use verbal representation and students with extended abstract level tend to use verbal, visual, and mathematical expression representation in solving PISA problem on change and relationship content. Verbal representation are generally showed by writing argument, possibilities, and reasons of the final answer. Visual representation are generally showed by making diagram and table. Mathematical expression representation are generally showed by writing the reasons of final answer by using addition expression.
Grouping District / Cities in Papua Based Poverty Indicators
Authors: Endartyana R Y , Permatasari E O
Published: June 2020

Welfare of the people is a very important thing in a country. One measure of the welfare of society is seen from indicators of poverty. The government conducts a long-term agreement in terms of encouraging change through SDG’s. One of the government’s target is less poverty in all its forms by 2030. The area in Indonesia which has the highest percentage of poor people in the provinces of Papua. Hence, the groups based Indicators of Poverty in Papua province using C-Means Clustering and Fuzzy C-Means Clustering. The indicators used in this analysis is an indicator of Health, Education Indicators and Household Characteristics indicator. Based on the analysis results obtained Fuzzy C-Means formed 5 group is the best method to classify District / Cities in Papua Province by minimumicdrate value. Areas that need to be the focus of the government to reduce poverty in Papua is the Puncak District.
The analysis of queue model on a motorcycle parking area
Authors: Setiawani Susi , Hidayatni Nirmalawati , Suharto
Published: June 2020

This research aims to determine the queue model on a motorcycle parking area at Jember Universityand its performance measures. The data collection method in this research uses the observation method. Data taken are the number of arrivals, the number of departures, and service time. To get arrival distribution and service time distribution use mathematical calculation and Kolmogorov-Smirnov Test with SPSS Statistics. After arrival distribution and service time distribution are known, then using Kendall Notation rule to get queue model. Formula derivation and POM-QM for Windows are used to obtain performance measurement values in the queue model. After getting the data needed through observation, then analysedtaht data to determine the value of arrival rate and service rate, then the data is reanalysed to find out the data obtained has been steady-state. This research is known that steady-state, so that distribution test can be done, with the result that the arrival distribution was Poisson distribution and the service time distribution was Exponential distribution. In modelling the queue Kendall Notation is required. It’s used to clarify how the queue system reviewed works and is modelled. Based on the results of data analysis in this research, the queue model obtained was (M/M/1):(FIFO/∞/∞).
Completeness and Fixed Point Theorem in Cone Rectangular Metric Spaces
Authors: Setiawan S E , Sunarsini  , Sadjidon
Published: June 2020

In this paper, we explore two properties of cone rectangular metric spaces: completeness and fixed point theorem. We analyse sufficient condition and necessary requirement for a cone rectangular metric space to be complete. We also give a new proof for fixed point theorem in cone rectangular metric spaces.
Multiclass classification of acute lymphoblastic leukemia microarrays data using support vector machine algorithms
Authors: Hamidah  , Rustam Z , Utama S , Siswantining T
Published: June 2020

Acute lymphoblastic leukemia (ALL) is a form of leukemia, or cancer of the white blood cells characterized by excess lymphoblast. Classification of acute lymphoblastic leukemia subtypes based on fusion genes that have a translocation. The fusion genes are BCR-ABL, E2A-PBX1, Hyperdiploid > 50 chromosomes, MLL, T-ALL, and TEL-AML1. The classification of acute lymphoblastic leukemia subtypes has an important role for the type of treatment that will be received, duration of treatment, medication needed during treatment, and other treatments that may be needed. In this paper, the method used is Multiclass Support Vector Machine Recursive Feature Elimination (MSVM-RFE) as the feature selection and One-Against-One Multiclass Support Vector Machine (OAO-MSVM) with RBF-Kernel with σ = 0.01 and Polynomial-Kernel with d = 4 as the classification methods. For the multiclass classification of acute lymphoblastic leukemia microarrays data, the best method to use is the MSVM Polynomial-Kernel with d = 4 that produces overall accuracy about 94%, precision about 96%, recall about 95%, F1 score about 95%, and the running time is 0.66 seconds.
Forecasting the number of lecturers by multi-input intervention model for human resource university planning policy
Authors: Kusrini Dwi Endah , Werdhiastuti Any
Published: June 2020

Institut Teknologi Sepuluh Nopember (ITS) as one of the leading universities in Indonesia that is currently transforming into an internationally reputed research university, must have a plan for employee needs, in this case, lecturers who can meet the needs of the university in line with organizational change. Good Human Resource planning must be supported by complete data and information. One way to predict the needs of lecturers is to do time series modelling using data on the number of ITS lecturers in previous years. The time series modelling used is intervention modelling because the initial hypothesis of this study was the number of lecturers’ needs had a significant change when ITS changed to BLU and PTNBH. Based on the background description above, the purpose of this study is to obtain an appropriate time series intervention model to predict the number of ITS lecturers based on the model that has been produced. Based on the results of data analysis, the best intervention model is ARIMA ([4, 5], 1, 0). It means that the number of lecturers in the t-month is influenced by the number of lecturers in the 4th, 5th, 6th months ago, and the forecasting results show that the number of lecturers will decrease every month, so it is necessary to add the number of lecturers regularly every year.
Parameter Estimation and Sensitivity Analysis of Malaria Model
Authors: Fatmawati  , Purwati Utami Dyah , Nainggolan Jonner
Published: June 2020

In this work, we present a model dynamic of malaria disease transmission in Papua province, Indonesia. The parameters of the model are estimated based on the monthly cumulative data of malaria cases in the Papua province in 2018. We use the least-square fitting technique to estimate the parameters. The basic reproduction number (R
0) of the model is estimated as R
0 ≈ 1.2929. Furthermore, the sensitivity analysis is done to determine the significance of the biological parameters in the disease spread. The numerical simulation indicates that the disease can be minimized by reduces the contact between human and mosquito.
Stability Analysis on Mangrove Forest Resource Models with Proboscis Monkey and Fish Pond Land Interaction with Time Delay
Authors: Nugraheni Kartika , Pancahayani Sigit , Herliansyah Riki
Published: June 2020

Mangrove is one of the most important ecosystems in Balikpapan, where the Proboscis monkeys-an endemic animal in Borneo-lives. The growth of their population is affected by the opening of pond land by human around the forest. In this research, the problem from the interaction among the growth rate of mangrove, monkey and the opened pond land is presented in a mathematics model in the form of prey-predator for those three variables. We give an attention to the model by introducing time delays for the growth rate of fish pond land. It shows that the linearized system performs a small perturbation and the value of critical delay of the characteristic equation will affects the stability of the equilibrium point and causes stability changes (Hopf bifurcation). In this work, we obtain the existence of a critical value of the time delay and the fulfillment of the transversal conditions.
The composition of the improved logistic map and the MS map in generating a new chaotic function
Authors: Satria Yudi , Suryadi MT , Solihat Ita M , Prawadika Luqman N , Melvina Venny
Published: June 2020

A new chaotic map is proposed from the composition of the improved logistic map and the MS map. The composition is done by mapping the MS map first, where the result is then mapped by the improved logistic map. The new map as the result of the composition is chaotic. This is shown by the Lyapunov Exponent analysis, bifurcation diagrams, and the NIST randomness test. The Lyapunov Exponent results with x0
= 0.1 are non-negative for r ∈ [1,4]. Its bifurcation diagrams with p ∈ (0,4) has a better density at r ∈ 2.5. The new chaotic function also passes 10 out of 16 NIST test, with initial value and parameter values x0
= 0.1, r = 2.5, and p = 2.5.