bluuebunny/crossref_metadata_2025 huggingface dataset:
Correction: Facile synthesis of ultrathin Ni-MOF nanobelts for high-efficiency determination of glucose in human serum
Authors: Xiao Xiao , Zheng Shasha , Li Xinran , Zhang Guangxun , Guo Xiaotian , Xue Huaiguo , Pang Huan
Published: June 2020

Correction for ‘Facile synthesis of ultrathin Ni-MOF nanobelts for high-efficiency determination of glucose in human serum’ by Xiao Xiao et al., J. Mater. Chem. B, 2017, 5, 5234–5239, DOI: 10.1039/C7TB00180K.
Combined dimercaptosuccinic acid and zinc treatment in neurological Wilson’s disease patients with penicillamine-induced allergy or early neurological deterioration
Authors: Zhu Xiao-Qun , Li Liang-Yong , Yang Wen-Ming , Wang Yu
Published: June 2020

The clinical data of safety and efficacy of a combined treatment with dimercaptosuccinic acid (DMSA) and Zinc with 2 years’ follow-up in 60 neurological Wilson’s disease (WD) patients was retrospectively analyzed. All the patients included in the present study were newly diagnosed and initialized with D-penicillamine (DPA) treatment but were found to have either neurological deterioration or allergy, and their treatment was switched to a combined treatment of DMSA and Zinc. Fifty-one patients (85%) had the neurological symptoms improved 1 and 2 years after treatment, 7 (11.67%) experienced a stable neurological condition, and 2 (3.33%) suffered deterioration of neurological symptoms. No early neurological deterioration was observed in all patients. Twenty-five percent patients experienced mild adverse reactions which did not require a discontinuation of the DMSA and Zinc treatment. Our study confirmed the safety and efficacy of the combined DMSA and Zinc therapy as an initial and probably long-term treatment in neurological WD patients.
Microwave non‐destructive testing of active frequency selective surface embedded tunable radar absorber
Authors: Sharma A. , Panwar R. , Khanna R.
Published: June 2020

The development and performance evaluation of a thin, broadband, and tunable radar wave absorber with reduced complexity is a strenuous task. This Letter reports the design, fabrication, and non‐destructive measurement of an active frequency selective surface (FSS) embedded tunable radar absorber. The proposed absorber design consists of periodically patterned, PIN diode mounted‐active transmissive/reflective FSS with a straightforward bias network. The tunable absorption characteristics are obtained over a wide frequency range by controlling the bias voltage of PIN diodes. The features of the proposed tunable absorber are demonstrated through non‐destructive free space, microwave measurement of a fabricated prototype. The measurement results show the achievement of a remarkable bandwidth of 3.0 GHz, which enables dynamic control of the absorption characteristics ranging from 8.2 to 12.4 GHz. Such an approach paves the way toward the realisation of smart materials and structures for electromagnetic wave manipulation.
Large‐disturbance stability analysis method based on mixed potential function for AC/DC hybrid distribution network with PET
Authors: Zhao Wenzhi , Zheng Jinghong , Han Zonghang , Liu Haizhou
Published: June 2020

The dynamics of the power electronic transformers (PETs) have brought great challenges to stability analysis of the AC/DC hybrid distribution network with PETs. In this study, a large disturbance stability analysis method is proposed for the AC/DC hybrid distribution network with PETs, based on the mixed potential function (MPF) theory. Firstly, the simple average models of the converters based on the controlled sources with the control links are presented to describe the dynamic characteristics of the AC/DC system, which are suitable for the MPF theory. Subsequently, the method of constructing the MPF for the non‐linear links in PET is proposed to derive a stability criterion for the AC/DC hybrid distribution network. The effects of the AC and DC dynamic characteristics and the non‐linear control links are both included in the criterion. Multiple scenarios of the faults or the large disturbances are used to investigate the effect of the stability criterion, and the results show that the stability state of the multi‐PET distribution network could be reflected by the stability criterion under various large disturbances. Finally, the parameter‐influence analysis method is proposed to improve the stability of the system.
Pyramidal approximation for power flow and optimal power flow
Authors: Zhou Bo , Fang Jiakun , Ai Xiaomeng , Yao Wei , Chen Zhe , Wen Jinyu
Published: June 2020

Power flow equations (PFEs) are the fundamental of power flow (PF) calculations and optimal PF (OPF) for power system analysis, but existing PFEs suffer from the trade‐off among various requirements in practice. This study presents a novel pyramidal approximation (PA) for PF and OPF. A multi‐sided pyramid is used to approximate the feasible region of PFEs. The PA‐based PFEs not only guarantee the linearity, tightness, and no dependence on the initial guess but also have high solution accuracy. The rotation‐and‐fold strategy is developed to balance the computational efficiency and approximation accuracy, so that the problem for a relatively large power system can be solved in a reasonable time. Case studies in different test systems validate the tightness and accuracy of the proposed PA method. The balance of accuracy and efficiency is also discussed, and the PA has a good performance in the small or medium power systems.
Dual‐polarised wideband tightly coupled dipole array for airborne applications
Authors: Johnson Alexander Dale , Zhong Jingni , Sekelsky Stephen , Alwan Elias A. , Volakis John L.
Published: June 2020

An ultra‐wideband (UWB) array is presented for UHF‐S band (0.19–2.3 GHz) communications with an emphasis on dual‐linear polarisation and wide‐angle scanning. The array achieves 12:1 impedance bandwidth for a voltage standing wave ratio (VSWR) <3 at broadside with low‐angle scanning off broadside to 0°, 45°, 60° in the E‐plane (VSWR < 3, 4, 3.1) and 0°, 45°, 60° (VSWR < 3, 3.8, 5.5) in the H‐plane. A 7 × 11 prototype was fabricated and tested for verification. In addition, finite effects with respect to mounting UWB arrays in airborne platforms are discussed. Specifically, the effect of radomes, perfect electric conductor shielding walls and resistive walls on the gain of the designed tightly coupled dipole antenna was studied, showing that losses can approach 2 dB.
GASP
Authors: Ramatsoku M. , Serra P. , Poggianti B. M. , Moretti A. , Gullieuszik M. , Bettoni D. , Deb T. , Franchetto A. , van Gorkom J. H. , Jaffé Y. , Tonnesen S. , Verheijen M. A. W. , Vulcani B. , Andati L. A. L. , de Blok E. , Józsa G. I. G. , Kamphuis P. , Kleiner D. , Maccagni F. M. , Makhathini S. , Molnár D. Cs. , Ramaila A. J. T. , Smirnov O. , Thorat K.
Published: June 2020

We present atomic hydrogen (H I) observations with the Jansky Very Large Array of one of the jellyfish galaxies in the GAs Stripping Phenomena sample, JO201. This massive galaxy (M* = 3.5 × 1010 M⊙) is falling along the line-of-sight towards the centre of a rich cluster (M200 ∼ 1.6 × 1015 M⊙, σcl ∼ 982 ± 55 km s−1) at a high velocity ≥3363 km s−1. Its Hα emission shows a ∼40 kpc tail, which is closely confined to its stellar disc and a ∼100 kpc tail extending further out. We find that H I emission only coincides with the shorter clumpy Hα tail, while no H I emission is detected along the ∼100 kpc Hα tail. In total, we measured an H I mass of MHI = 1.65 × 109 M⊙, which is about 60% lower than expected based on its stellar mass and stellar surface density. We compared JO201 to another jellyfish in the GASP sample, JO206 (of a similar mass but living in a ten times less massive cluster), and we find that they are similarly H I-deficient. Of the total H I mass in JO201, about 30% lies outside the galaxy disc in projection. This H I fraction is probably a lower limit since the velocity distribution shows that most of the H I is redshifted relative to the stellar disc and could be outside the disc. The global star formation rate (SFR) analysis of JO201 suggests an enhanced star formation for its observed H I content. The observed SFR would be expected if JO201 had ten times its current H I mass. The disc is the main contributor of the high star formation efficiency at a given H I gas density for both galaxies, but their tails also show higher star formation efficiencies compared to the outer regions of field galaxies. Generally, we find that JO201 and JO206 are similar based on their H I content, stellar mass, and star formation rate. This finding is unexpected considering their different environments. A toy model comparing the ram pressure of the intracluster medium (ICM) versus the restoring forces of these galaxies suggests that the ram pressure strength exerted on them could be comparable if we consider their 3D orbital velocities and radial distances relative to the clusters.
Onkonephrologie am Beispiel des Plasmazellmyeloms – Was Nephrologen und Hämatoonkologen voneinander lernen können
Authors: Schönermarck Ulf , Hentrich Marcus , Bassermann Florian , Theurich Sebastian , Fischereder Michael
Published: June 2020

Plasma cell diseases, in particular multiple myeloma, represent an interdisciplinary challenge for oncologists and nephrologists. Patients often present initially with kidney problems to a nephrologist, requiring timely diagnosis and referral to an oncologist for treatment. On the other hand, a relevant part of patients will experience a – mostly temporary – decline in kidney function during the treatment course, which may require nephrological care. In any case, renal insufficiency can affect the therapeutic options. This article provides a short overview about common nephrological factors and complications which impact on the manifestation and course of treatment in patients with plasma cell diseases.
Dorsal Preservation Rhinoplasty: Core Beam Computed Tomography Analysis of the Nasal Vault, Septum, and Skull Base—Its Role in Surgical Planning
Authors: Sadri Amir , East Charles , Badia Lydia , Saban Yves
Published: June 2020

Dorsal preservation rhinoplasty in cases of a convex or overprojected noses has significant advantages over resection and reconstruction of the dorsum. Analysis of the subdorsal septum in relation to the radix osteotomy to achieve a drop or hinge of the natural dorsum is important in avoiding possible complications involving the skull base, frontal sinus, and subsequent radix position. In the majority of patients, simple cut release of the perpendicular plate rather than resection superiorly may be necessary where the quadrangular cartilage junction with the perpendicular plate is caudal to the radix osteotomy. Computed tomography is helpful in delineating this position as well as providing information on the frontal sinus and position of the cribriform plate prerhinoplasty.
Protective coatings with modified silica nanoparticles defend against bacteria and fungi
Authors: Mandel Savannah
Published: June 2020

A comparative study on fungi attachment to industrial surfaces identifies optimal protective coatings.
A sequence of small perturbations eliminates unwanted transient chaos
Authors: Bandari Anashe
Published: June 2020

Though chaotic dynamics are ubiquitous, they are often unwanted and potentially detrimental, and the ability to terminate them quickly is a necessity.
Topological localized states in the time delayed Adler model: Bifurcation analysis and interaction law
Authors: Munsberg L. , Javaloyes J. , Gurevich S. V.
Published: June 2020

The time-delayed Adler equation is the simplest model for an injected semiconductor laser with coherent injection and optical feedback. It is, however, able to reproduce the existence of topological localized structures (LSs) and their rich interactions. In this paper, we perform the first extended bifurcation analysis of this model and we explore the mechanisms by which LSs emerge. We also derive the effective equations governing the motion of distant LSs and we stress how the lack of parity in time-delayed systems leads to exotic, non-reciprocal, interactions between topological localized states.
Molecular integrals from Fast Fourier Transforms (FFT) instead of recurrences: The McMurchie–Davidson case
Authors: Peels Mieke , Knizia Gerald
Published: June 2020

We report a closed formula expressing the McMurchie–Davidson (MD) key intermediates {[r](0); rx + ry + rz ≤ L} directly in terms of the set of basic integrals {[0](m); m ≤ L}, without any recurrences. This formula can be evaluated at O(L) cost per output [r](0) with dense matrix multiplications and Fast Fourier Transforms (FFT). Key to this is the fact that the transformation that builds Cartesian angular momentum from the basic integrals, {[0κ](m+m′)}↦{[lκ](m)} (κ ∈ {x, y, z}), can be phrased as a circulant-matrix/vector product, which is susceptible to FFTs. After simplification, a simple formula yields the final [r](0) in one step, as contraction of four auxiliary vectors over a common Fourier index k—one vector for the [0](m) and one for each Cartesian axis. Similar transformations occur in many integral approaches beside MD, making this idea potentially broadly applicable. The simple resulting code and data structures may make it attractive for novel hardware platforms.
Direct measurements of the magnetocaloric effect of Fe49Rh51 using the mirage effect
Authors: Amirov A. A. , Cugini F. , Kamantsev A. P. , Gottschall T. , Solzi M. , Aliev A. M. , Spichkin Yu. I. , Koledov V. V. , Shavrov V. G.
Published: June 2020

The magnetocaloric effect in the Fe49Rh51 alloy was systematically studied using three different approaches: in-field differential scanning calorimetry, standard direct measurement of the adiabatic temperature change, and a non-contact method based on a thermo-optical phenomenon, the mirage effect, which was able to directly test the magnetocaloric response induced by a fast magnetic field variation. The metamagnetic phase transition of Fe49Rh51 was studied in the temperature range of 290–330 K at magnetic fields up to 1.8 T through magnetic and calorimetric measurements. The estimated parameters of phase transition were comparable with the literature data. The values of adiabatic temperature change obtained with the three methods (calorimetry, standard direct measurement, and mirage-based technique), which explore three different time scales of the field variation (static field, 1 T s−1, 770 T s−1), were consistent, proving the absence of dynamic constraints in the first-order magnetostructural transition at the maximum field sweep rate.
Truncation of a nanosecond CO2 laser pulse by following of the temporal characteristics of the plasma parameters in laser ablation model
Authors: Rezaei Fatemeh , Beheshtipour Saleheh , Sedeh Amirhossein Barati
Published: June 2020

The evolution of laser-induced plasma for an aluminum target in a helium ambient gas at different pressures of 100, 300, 500, 700, and 1000 mbar is numerically studied. A thermal model of laser ablation is utilized for calculation of plasma parameters which comprise heat conduction, Euler equations, Saha–Eggert equations, Knudsen layer boundary condition, mass and energy balance relations, and optical shielding effects. In addition, in order to determine the temporal parameters of aluminum's plasma, the hydrodynamic equations are computed for calculation of the plasma absorption due to inverse Bremsstrahlung and photoionization. A CO2 laser pulse at a wavelength of 10.6 μm with different pulse durations of 50 and 100 ns is irradiated on laser induced Al plasma for truncation of the transmitted CO2 laser pulse. The laser intensities irradiated on the Al sample for producing plasma and generation of a shortened pulse are considered as 1016, 1017, and 5 × 1017 W/m2. Furthermore, for validation of the theoretical calculations, some experimental results are presented. Results showed that higher helium gas pressures caused the critical density attained at earlier delay times which caused the CO2 laser beam became efficiently truncated. Moreover, it is concluded that pulse duration has an inverse relation with ambient gas pressure and laser intensity which means that the higher gas pressure or laser intensity induces less pulse duration.
Nonequilibrium processes in repulsive binary mixtures
Authors: Santos-Flórez Pedro Antonio , de Koning Maurice
Published: June 2020

We consider rapid cooling processes in classical, three-dimensional, purely repulsive binary mixtures in which an initial infinite-temperature (ideal-gas) configuration is instantly quenched to zero temperature. It is found that such systems display two kinds of ordering processes, the type of which can be controlled by tuning the interactions between unlike particles. While strong inter-species repulsion leads to chemical ordering in terms of an unmixing process, weak repulsion gives rise to spontaneous crystallization, maintaining chemical homogeneity. This result indicates the existence of a transition in the topography of the underlying potential-energy landscape as the intra-species interaction strength is varied. Furthermore, the dual-type behavior appears to be universal for repulsive pair-interaction potential-energy functions in general, with the propensity for the crystallization process being related to their behavior in the neighborhood of zero separation.
External quantum efficiency measurements used to study the stability of differently deposited perovskite solar cells
Authors: Hierrezuelo-Cardet Pedro , Palechor-Ocampo Anderzon F. , Caram Jorge , Ventosinos Federico , Pérez-del-Rey Daniel , Bolink Henk J. , Schmidt Javier A.
Published: June 2020

The instability exhibited by perovskite solar cells when exposed to the environment under illumination is one of the major obstacles for the entry of perovskite technology in the photovoltaic market. In this work, we use the external quantum efficiency (EQE) technique to study the photoinduced degradation of two types of solar cells having CH3NH3PbI3 as an absorber layer: one deposited by spin coating with an n-i-p architecture and the other deposited by evaporation with an inverted p-i-n structure. We also study the effect of different encapsulants to protect the cells against atmospheric agents. We find that EQE provides information regarding the areas of the cell most susceptible to degradation, in addition to providing an estimate of the optical gap and the Urbach energy of the absorbent material. We confirm that the combined action of illumination and the environment markedly accelerate the degradation, which is reflected in the deterioration of all the parameters of the cell. The rear part of the cell is the first region to suffer the light-induced degradation. On the other hand, the cells deposited by evaporation and with a good encapsulation process are highly stable since after 30 h of exposure just a small spectral change is noticed in the red/infrared region of the EQE spectrum.
Dual vortex breakdown in a two-fluid confined flow
Authors: Naumov Igor V. , Sharifullin Bulat R. , Tsoy Mikhail A. , Shtern Vladimir N.
Published: June 2020

This experimental study reveals a spectacular and important phenomenon—double vortex breakdown—in a swirling flow of two immiscible fluids where vortex breakdown bubbles evolve simultaneously in both fluids. The rotating lid drives the steady axisymmetric motion in a sealed vertical cylindrical container whose other walls are stationary. As the rotation intensifies, topological metamorphoses occur, resulting in a multicellular flow. Two new circulation cells (vortex breakdown bubbles) simultaneously develop near the centers of both fluids while the flow remains steady and axisymmetric. Such a pattern can help provide fine, gentle, and nonintrusive mixing in chemical and biological reactors.
Hermite-Padé approximants to the Weyl function and its derivative for discrete measures
Authors: Sorokin V. N.
Published: June 2020

Hermite-Padé approximants of the second kind to the Weyl function and its derivatives are investigated. The Weyl function is constructed from the orthogonal Meixner polynomials. The limiting distribution of the zeros of the common denominators of these approximants, which are multiple orthogonal polynomials for a discrete measure, is found. It is proved that the limit measure is the unique solution of the equilibrium problem in the theory of the logarithmic potential with an Angelesco matrix. The effect of pushing some zeros off the real axis to some curve in the complex plane is discovered. An explicit form of the limit measure in terms of algebraic functions is given.

Bibliography: 10 titles.
Waveguide with double threshold resonance at a simple threshold
Authors: Nazarov S. A.
Published: June 2020

A threshold resonance generated by an almost standing wave occurring at a threshold — a solution of the problem that do not decay at infinity, but rather stabilizes there — brings about various anomalies in the diffraction pattern at near-threshold frequencies. Examples when a simple threshold resonance occurs or does not occur are trivial. For the first time an acoustic waveguide (the Neumann spectral problem for the Laplace operator) of a special shape is constructed in which there is a maximum possible number (namely two) of linearly independent almost standing waves at a threshold (equal to a simple eigenvalue of the model problem on the cross-section of the cylindrical outlets to infinity). Effects in the scattering problem for acoustic waves, which are caused by these standing waves are discussed.

Bibliography: 54 titles.
Changes in bat activity over 10 years in silviculturally treated wet sclerophyll forest
Authors: Law B. , Chidel M. , Brassil M. T. , Potter T.
Published: June 2020

A range of silvicultural treatments are applied to timber production forests, resulting in varied vegetation structural complexity. We compared the bat assemblage across three silvicultural treatments (unlogged forest, unthinned regrowth and thinned regrowth), two locations (on and off track) and three time periods (pre-thin, plus one and six years post-thinning) in wet sclerophyll forests, with treatments implemented at a small catchment scale. Linear edges provided important habitat for bats as total bat activity was substantially greater on tracks than off tracks, especially in unlogged and unthinned regrowth forest. Bat activity off track was greater in unlogged areas than in thinned and unthinned regrowth. Activity and species richness off track were greater in thinned than unthinned regrowth, but the time by treatment interaction was not significant for activity, indicating this difference cannot be ascribed to thinning alone. Thinning also led to a species composition that more closely resembled unlogged forest than unthinned regrowth. These patterns in bat activity across silvicultural treatments in wet sclerophyll forests were broadly consistent with other forest types, but subtleties, such as a subdued response to thinning, requires more replication to resolve. Nevertheless, differences between forest types need to be considered when developing management strategies.
Humerus midshaft histology in a modern and fossil wombat
Authors: Walker Meg M. , Louys Julien , Herries Andy I. R. , Price Gilbert J. , Miszkiewicz Justyna J.
Published: June 2020

The common wombat (Vombatus ursinus) is equipped with a set of physiological and morphological adaptations suited to a fossorial lifestyle. These allow wombats to engage in efficient scratch-digging and maintaining a low basal metabolic rate while living underground. While bone microstructure has been described for several subterranean animals, wombat bone histology has received very little attention to date. Here, we present preliminary insights into bone histology in modern adult V. ursinus (Mt Fairy, New South Wales) and Pleistocene fossil Vombatus sp. (Bakers Swamp, New South Wales) midshaft humeri. The modern sample was well preserved, allowing us to identify varying bone tissue types (woven, parallel-fibred, lamellar). The sample showed vascularity composed of primary and secondary osteons, and simple longitudinal and radial vessels. We also observed evidence for Haversian remodelling (i.e. localised replacement of pre-existing bone) and coarse compact cancellous bone within the inner cortex of the diaphysis. The fossil histology was poorly preserved, but likely showed bone matrix organisation similar to the modern specimen. We use these preliminary data to discuss hypotheses for wombat forelimb biomechanical and physiological microscopic adaptation to a burrow environment. We encourage future intraskeletal examination of microstructure in wombat populations to better inform their ecological adaptations and behaviour in palaeontological contexts.
Structured clustering of the glycosphingolipid GM1 is required for membrane curvature induced by cholera toxin
Authors: Kabbani Abir Maarouf , Raghunathan Krishnan , Lencer Wayne I. , Kenworthy Anne K. , Kelly Christopher V.
Published: June 2020

Significance

Membrane-binding toxins demonstrate both a public health challenge and a bioengineering opportunity due to their efficient internalization into cells. These toxins multivalently bind to naturally occurring lipid receptors at the plasma membrane and initiate endocytosis. This manuscript reports the importance of structured lipid receptor clustering for the induction of membrane bending. We also observed that the magnitude of membrane curvature was correlated to the stoichiometry of toxin-bound receptors. By identifying how these bacterial proteins initiate membrane curvature, these findings provide mechanistic insights into the early steps of pathogenic endocytosis.
Anne Frank’s Diary – The Graphic Adaptation as a case of
“indirect translation”
Authors: Weissbrod Rachel , Kohn Ayelet
Published: June 2020

The 2017 adaptation of Anne Frank’s diary into a graphic novel by Ari Folman and
David Polonsky is addressed in this article as a case of indirect translation, a
concept developed by Ernst-August Gutt on the basis of relevance theory. According
to Gutt, indirect translation “interpretively resembles” the source text in respects
that are relevant to a new target audience in a new context. Rather than applying
this concept to interlingual translation, we use it to study an adaptation which
involves a change of modalities – from the verbal to the multimodal. To find out how
the adaptation retains the relevance of the original diary to a new generation of
readers, familiar with new media and visual means of communication, we employ the
Bakhtinian concepts of chronotope and polyphony. Through this case study we hope to
demonstrate the usefulness of Gutt’s concept of “indirect translation” to the study
of adaptations, to offer a link between the principle of relevance and Bakhtinian
concepts, and to shed new light on the principle of relevance itself.
“Do you condemn?”
Authors: Kampf Zohar
Published: June 2020

This chapter discusses a specific type of interactional ritual in ethno-political
interviews, one that hinders their conciliatory potential. The ritual is performed
by two types of participants: Jewish-Israeli interviewers demanding the condemnation
of transgressions committed by others, and the respective response by Arab-Israeli
political representatives in the role of interviewees. Negotiation over
condemnations is examined, as this speech act is considered crucial to setting up
models for civic behavior. The chapter demonstrates how interviewers’ efforts to
exercise interactional and social power through pushing their interviewees to adopt
a consensual stance are rejected by resorting to indirect answer designs. It
concludes by discussing the extent to which “do you condemn” questions may be
perceived as a legitimate professional journalistic practice.
Does cosmological evolution select for technology?
Authors: Shainline Jeffrey M
Published: June 2020

If the parameters defining the physics of our universe departed from their present values, the observed rich structure and complexity would not be supported. This article considers whether similar fine-tuning of parameters applies to technology. The anthropic principle is one means of explaining the observed values of the parameters. This principle constrains physical theories to allow for our existence, yet the principle does not apply to the existence of technology. Cosmological natural selection has been proposed as an alternative to anthropic reasoning. Within this framework, fine-tuning results from selection of universes capable of prolific reproduction. It was originally proposed that reproduction occurs through singularities resulting from supernovae, and subsequently argued that life may facilitate the production of the singularities that become offspring universes. Here I argue technology is necessary for production of singularities by living beings, and ask whether the physics of our universe has been selected to simultaneously enable stars, intelligent life, and technology capable of creating progeny. Specific technologies appear implausibly equipped to perform tasks necessary for production of singularities, potentially indicating fine-tuning through cosmological natural selection. These technologies include silicon electronics, superconductors, and the cryogenic infrastructure enabled by the thermodynamic properties of liquid helium. Numerical studies are proposed to determine regions of physical parameter space in which the constraints of stars, life, and technology are simultaneously satisfied. If this overlapping parameter range is small, we should be surprised that physics allows technology to exist alongside us. The tests do not call for new astrophysical or cosmological observations. Only computer simulations of well-understood condensed matter systems are required.
MHD stability of JT-60SA operation scenarios driven by passing energetic particles for a hot Maxwellian model
Authors: Varela J. , Watanabe K.Y. , Shinohara K. , Honda M. , Suzuki Y. , Shiraishi J. , Spong D.A. , Garcia L.
Published: June 2020

We analyze the effects of the passing energetic particles on the resistive ballooning modes (RBM) and the energetic particle driven modes in JT-60SA plasma, which leads to the prediction of the stability in N-NBI heated plasma. The analysis is performed using the code FAR3d that solves the reduced MHD equations describing the linear evolution of the poloidal flux and the toroidal component of the vorticity in a full 3D system, coupled with equations of density and parallel velocity moments for the energetic particle (EP) species assuming an averaged Maxwellian EP distribution fitted to the slowing down distribution, including the effect of the acoustic modes. The simulations show the possible destabilization of a

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TAE with a frequency (f) of 115 kHz, a

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TAE with f = 98 kHz and a 6/4 or 7/4 BAE with f = 57 kHz in the ITER-like inductive scenario. If the energetic particle β increases, beta induced Alfven Eigenmodes (BAE), toroidal AEs (TAE) and elliptical AEs (EAE) are destabilized between the inner-middle plasma region, leading to the overlapping of AE of different toroidal families. If these instabilities coexist in the non-linear saturation phase the EP transport could be enhanced leading to a lower heating efficiency. For a hypothetical configuration based on the ITER-like inductive scenario but an center peaked EP profile, the EP β threshold increases and several BAEs are destabilized in the inner plasma region, indicating an improved AE stability with respect to the off-axis peaked EP profile. In addition, the analysis of a hypothetical JT-60SA scenario with a resonant q = 1 in the inner plasma region shows the destabilization of fishbones-like instabilities by the off-axis peaked EP profile. Also, the EPs have a stabilizing effect on the RBM, stronger as the population of EP with low energies (below 250 keV) increases at the plasma pedestal.
Mathematical modeling with digital technological tools for interpretation of contextual situations
Authors: Villamizar F , Martínez A , Cuevas C , Espinosa-Castro J
Published: June 2020

This article has the goal of proposing physical contextual situations modeling as a way to interpret mathematical representations that are produced by digital technological tools. Thus, there is an experimental situation-problem about a physical phenomenon that is modeled through video analysis and dynamic geometry software; the methodological model Cuvima conducts the experimental activity. Pre-testing and post-testing measuring instruments were designed to obtain the information and previous conceptions of ten graduate students in Mathematical Education, which showed a conceptual change. Similarly, results prove that digital technology, from a didactical sequence, supports and strengthens experimental work simplifying modeling processes of a physical phenomenon, promoting the use of mathematical representations to solve a situation-problem.
Characterization of hand movements using a low cost electromyography sensor
Authors: Laverde G , Salinas S , Montero D , Rueda C , Altuve M
Published: June 2020

Electromyography signals are commonly used to control prosthetic or orthotic devices. The electrodes attached to the skin capture the muscular activity coming from neuromotor signals. Robotic prostheses help to improve the quality of life of people who suffer from physical disabilities such as amputations of lower or upper limbs. However, these prostheses are quite expensive, and the operation of the robotic prosthesis depends on the contraction muscles that generally uses two movements, contraction and relaxation (closing and opening). In this paper, we propose the characterization of hand movements by means of an inexpensive electromyographic sensor, the MyoWare AT-04-001, which acquired neuromotor signals due to muscle contraction in the forearm. Four movements were recorded: flexion, extension, opening and closing of the hand. Hand movements were performed at one movement per second, as indicated by a metronome. Signals were acquired with an Arduino one at a sampling frequency of 200 Hz for 30 s. Using time-domain, frequency-domain and nonlinear measures we characterized the electromyography signal for each movement. We observed that the closing and extension of the hand produced the greatest amount of variance and entropy of the electromyography signal as well as the greatest energy in the frequency domain. These results were related to the location of the electrode in the forearm, since the sensor was placed in the muscles involved in the execution of these movements.
Beliefs about mathematics and academic performance: A descriptive - correlational analysis
Authors: Rincon G A , Fernández Cézar R , Hernandez C F
Published: June 2020

The purpose of this report has been to analyze students’ beliefs about mathematics and its relationship with their academic performance. The methodology used is quantitative, coupled to two study analyzes, the descriptive and the correlational, based on a non-experimental type design, correlational-causal transverse, since it seeks to explain the relationship between the variables. The technique used for data collection was a structured questionnaire, of questions of the Likert Scale type, which was applied to 121 students of 3 grade of primary basic education, belonging to a public educational institution of “San José de Cúcuta, Colombia”, selected by non-probabilistic sampling. This instrument was submitted to the respective analyzes that determined its validity and reliability. For academic performance the instrument of characterization of skills and procedures used by third grade students in the area of mathematics was used, designed by the all to Learn program of the “Ministerio de Educación Nacional, Colombia”. The results show that beliefs about mathematics, from the perspective of students, are a factor in the academic performance of that area.
Effect of the total lunar eclipse of 28 July 2018 on the night sky brightness at the Observatorium Ilmu Falak Universitas Muhammadiyah Sumatera Utara
Authors: Butar-Butar A J R , Raisal A Y , Pramudya Y
Published: June 2020

The measurement of the Night Sky Brightness (NSB) has been done at the Observatorium Ilmu Falak Universitas Muhammadiyah Sumatera Utara (OIF UMSU) during the total lunar eclipse on 28 July 2018. NSB was measured using three Sky Quality Meters (SQMs). We were directing those SQMs to the eastern horizon, zenith, and the western horizon with a resolution of 2 seconds. The results showed that zenith direction SQM data had a change in NSB due to the lunar eclipse. Before the eclipse, the NSB was 14.78 mpsas, and the NSB during the total Moon phase was 18.03 mpsas. While the SQM data in the direction of the eastern and the western horizons are showing insignificant changes, those were 15.58 mpsas and 15.15 mpsas, respectively. These are because fog and light pollution originating from the city center of Medan are heavily influencing the area in the direction of the eastern and western horizons.
Long term orbital dynamics of a retrograde Centaur 2006 RJ2
Authors: Pangestu A D , Dermawan B
Published: June 2020

Centaurs are small bodies whose semi-major axes are located between Jupiter and Neptune. They have chaotic orbits and may be in orbital resonances with giant planets. An orbital resonance occurs when a simple commensurability presents between some fundamental frequencies of orbital elements. One of the resonance states is 1:1 (mean motion) resonance or co-orbital with the respected planet. This resonance can also occur in high inclination Centaurs. This study describes the results of long term orbital integration of a retrograde Centaur 2006 RJ2 (inclination of 165°) for 200,000 years. Resonance state of 2006 RJ2 was examined using the FAIR (Fast Identification of Mean Motion Resonance) method for 243 orbital clones with automation by developing Python codes. We report that 2006 RJ2 may be in retrograde 1:1 resonance with Saturn for about 160,000 years in the future. However, the clones exhibit chaotic orbits and show many temporally unstable resonances. Since the quality of its orbital elements is not quite precise, 2006 RJ2 shows a low possibility in the state of long retrograde 1:1 resonance with Saturn.
The Effect of Neutron Decaying to Dark Matter on Properties of Neutron Stars with Hyperons
Authors: Wahidin A B , Sulaksono A
Published: June 2020

It has been reported that there is a discrepancy of 4σ in the neutron lifetime measurement with two methods, i.e., the trap method (measuring the number of neutrons remaining in the various time intervals) and beam method (measuring the number of protons formed from regulated neutrons currents). Fornal and Grinstein (2019) proposed that the possibility neutrons decay into the dark matter can explain this discrepancy. In this study, the author asses the consequence of the proposal by studying the impact on neutron stars with Hyperon. Based on our numerical calculation we found that dark matter may be present in the core of a neutron star because it only appears at very high densities, and the population is negligible with a maximum population of about 0.1%
Consumption Evaluation of Energy Consumption and Emissions of BAS KITe in Kuala Terengganu from the Development of Its Driving Cycle
Authors: Anida I.N. , Norbakyah J.S. , Zulfadli M. , Norainiza M.H. , Salisa A.R.
Published: June 2020

Public transportation transforms communities and the lives of the people dwelling in them via spurring monetary development, promoting sustainable existence and providing a greater first-rate of life. In Kuala Terengganu, an iconic and famous public bus is called ‘BAS KITe’. In order to evaluate the energy consumption and emissions of BAS KITe, its driving cycle needs to be developed. Driving cycle represents traffic behaviour in a specific area or city. Objectives of this paper are; to characterize and validate the parameters of BAS KITe driving cycle with existing driving cycle, to develop BAS KITe driving cycle using k-means method, and to analyse the energy consumption and emissions of BAS KITe driving cycle for conventional and plug-in hybrid electric types using AUTONOMIE software. The methodology consists of data collection, route selection and cycle development. From the validation, it can be concluded that the MATLAB code is acceptable for further analysis. The BAS KITe driving cycle is developed with 36 final micro-trips and 21.49 km/h of average speed. Hence, energy consumption and emissions analysis shows that the PHEB powertrain gives the best result with reduced energy consumption and emissions thereby minimizing the impact on the environment and economy.
Effect of Crack on Bending Process for S55c Carbon Steel with Ultrasonic Testing on Zero Degree Probes
Authors: Ali Kharudin , Rifai Damhuji , Siaw Paw Johnny Koh , Abdalla Ahmed N. , Hen Chong Kok , M.Sukor M. Fadzli , Ismail Zulkifli , Ding Tan Jian
Published: June 2020

Bending force and fatigue-induced crack is a generally assured trouble in industrial pipe line achieving their original design life. An amount of high-profile accidents has been covered in the past that involved bending and fatigue harm in structures. Such that incidences frequently encounter without prior warnings ascribable deficiency of proper crack monitoring method. Called for to discover and monitor the bending and fatigue crack, ultrasonic (UT) and acoustic emission (AE) technique, has been encountering growing concerns recently. This paper presenting the measurement and effect of bending test at carbon steel plate with different length and defect’s depth by using ultrasonic testing with considering the defect size at failure point. The zero-degree probe and 4MHz excitation frequency is used in UT measuring for condition of S55C carbon steel plate within before bending process and after bending process. From the result show that effect of bending force will increase the velocity (m/s), gain (dB), beam path (mm) and thickness plate (mm) based on the defect sizes. The increasing of four parameters can be explained namely 0.19% - 0.3% velocity, 17% - 20% gain, 10% - 12% beam path and 5.0% - 7.5% thickness of plate.
Internet of Things (IoT) Based Smart Shop (S-SHOP) System with RFID Technique
Authors: Abdullah Samihah , Daud Amerrudin , Mohamad Hadis Nor Shahanim , Hamid Shabinar Abd , Fadhlullah Solahuddin Yusuf , Damanhuri Nor Salwa
Published: June 2020

Billing system technology in the market nowadays is less efficient in parallel with revolution of technology. Conventional method widely uses a barcode scanner that has disadvantages as it is a manual system and requires man power. Besides that, the conventional method does not store the information such as warranty of the product and the information of a buyer. Using the smart shop billing system using Radio Frequency Identification (RFID) reader and RFID tag, the system will become more efficient and automated. The system consists of two main elements which are passive RFID tag (125 kHz) and RFID reader (ID-20LA) that has similar function with a barcode tag and a barcode scanner. For the hardware components, the Espresso Lite V2.0 acts as a microcontroller and UC00C acts as Universal Asynchronous Receiver/Transmitter (UART) converter and Arduino IDE is used as a platform to link between hardware and software. The system is completed with the Internet of Things (IoT) technique to make sure the system can be operated wirelessly. As a result, all the information from the reader will be sent to Google spreadsheet as a cloud to store the information about the item to generate GUI bill. In conclusion this proposed system also uses a real time tracking.
Fabrication of Highly Stable Non-Volatile Memory Device Using Plasma-Polymerisation of Hexamethyldisiloxane with Graphene Quantum Dots
Authors: Ooi Poh Choon , Razip Wee M. F. Mohd. , Hussain Afifuddin Husairi
Published: June 2020

We demonstrated the fabrication of a highly stable non-volatile memory (NVM) device using pulsed radiofrequency (rf) plasma polymerization and a simple solution route. The two-terminal NVM devices were fabricated based on a metal-insulator-metal (MIM) structure consisting of graphene quantum dots (GQDs) embedded in hexamethyldisiloxane (HMDSO) dielectric layers. GQDs, the charge trapping layer, and the top contacts were formed by spin coating and spray coating methods. Whereas, the dielectric layers were deposited using pulsed rf plasma polymerization as it is a no thermal stressed induced method to deposit the insulator layers and does not disturb the deposited charge trapping nanoparticles. The current-voltage (I-V) curves showed highly reproducible bistable current behavior with the presence of a hysteresis window when measured at room temperature. The fabricated NVM memory devices were reprogrammable for multiple times with a distinct ON/OFF ratio of 103. Various conduction mechanisms were proposed based on the obtained I-V data.
Ballistic Performance Evaluation of Aluminium Plate Impact by Fragment Simulating Projectile
Authors: Aziz MR , Zainol MF , Othman R
Published: June 2020

The ballistic performance has drawn attention to researchers from a military background. They intend to provide solutions to ensure the soldiers in the front line of war do not kill in action. A casualty in war can lead to depression among soldiers and not to mention to their family as well. The aim of this work is to provide preliminary data for the ballistic limit velocity, VBL of the hydrodynamic ram study. The test was conducted at Science and Technology Research Institute (STRIDE), Batu Arang, Selangor which is under the Ministry of Defence (MINDEF) Malaysia. The gas gun and fragment simulating projectiles (FSP) were employed in this test. There were about 16 rounds of fire were shot with different velocities from 246 up to 373 m/s. The ballistic limit velocity was calculated by taking the average of an equal number of highest partial perforation and the lowest perforation velocities. It was found that the VBL was equal to 275.8 m/s. On top of that, there were two main failure modes observed i.e. partial penetration and complete penetration.
Transfer Matrix Mathematical Method for Evaluation the DBR Mirror for Light Emitting Diode and Laser
Authors: Sharhan Alaa Abdulwahid
Published: June 2020

Applied mathematics is one of the most widely sciences used to serve other sciences, especially physical mathematics, which is one of the most important applied mathematics topics used in physics. In this work, we used the Transfer matrix mathematical method for evaluation the Distributed Bragg Reflectors mirrors for vertical cavity and the wavelength And The method of light extraction from the martials pay attention from the researchers since the LED and Laser become the most popular devices in different applications. This study focused on the development of simulation method to design and optimization for the DBR(Distributed Bragg Reflectors) structures, which are commonly used in designing DBR mirrors for vertical cavity surface emitting GaN based LEDs and lasers. From the multi-layer simulation, the simulation results are given for the investigation of several properties. First, the wavelength(nm) vs. reflectance(%) can be calculated in the DBR structures that TiO2 and SiO2 thin films are stacked alternately. As a results, it is suggested that highly efficient DBR structures can be designed and manufactured using simulation methodology.