bluuebunny/crossref_metadata_2025 huggingface dataset:
Fear of Cancer Recurrence in Women with Breast Cancer: A Cross-Sectional Study after Mastectomy
Authors: ZORBA BAHÇELİ Pınar , YAZICIOĞLU KÜÇÜK Banu
Published: August 2022

Aim: The aim of this study was to determine the fear of cancer recurrence in women with breast cancer after mastectomy.

Material and Methods: Data were collected between March and September 2021 with the Personal Information Form and the Fear of Cancer Recurrence Inventory via social media. The sample consisted of 127 women with breast cancer, who were registered in the general surgery service of a training and research hospital in Turkey, could be reached by phone and had a social media account. Descriptive statistics, independent groups t test, One-Way ANOVA and Mann-Whitney U test analysis were used in the analysis of the data.

Results: It was determined that the Fear of Cancer Recurrence Inventory mean score was 126.12±24.88 and the coping strategies sub-dimension mean score was 30.96±6.00. It was determined that there was a significant difference between the mean score of the Fear of Cancer Recurrence Inventory and the duration of diagnosis, the status of receiving radiotherapy and chemotherapy, the status of experiencing treatment-related side effects, and the status of doing any sports/exercise (p
PULMONAR.Y ARTERIAL HYPERTENSION ASSOCIATED WITH A SYSTEMIC SCLEROSIS: REVIEW OF LITERATURE
Authors: Yudkina N. N. , Volkov A. V.
Published: August 2022

The review is devoted to a problem of the pulmonary arterial hypertension associated with a systemic sclerosis. Data on prevalence, genetic aspects, clinical features and the diagnostic algorithms used for early diagnostics of this fatal manifestation of a system sclerosis are submitted.
Chemical Abundances of Young Massive Clusters in NGC 1313∗
Authors: Hernandez Svea , Winch Autumn , Larsen Søren , James Bethan L. , Jones Logan
Published: August 2022

We analyze spectroscopic observations of five young massive clusters (YMCs) in the barred spiral galaxy NGC 1313 to obtain detailed abundances from their integrated light. Our sample of YMCs was observed with the X-shooter spectrograph on the Very Large Telescope. We make use of theoretical isochrones to generate synthetic integrated-light spectra, iterating on the individual elemental abundances until converging on the best fit to the observations. We measure abundance ratios for [Ca/Fe], [Ti/Fe], [Mg/Fe], [Cr/Fe], and [Ni/Fe]. We estimate an Fe abundance gradient of −0.124 ± 0.034 dex kpc−1, and a slightly shallower α gradient of −0.093 ± 0.009 dex kpc−1. This is in contrast to previous metallicity studies that focused on the gas-phase abundances, which have found NGC 1313 to be the highest-mass barred galaxy known not to have a radial abundance gradient. We propose that the gradient discrepancy between the different studies originates from the metallicity calibrations used to study the gas-phase abundances. We also observe an age–metallicity trend that supports a scenario of constant star formation throughout the galaxy, with a possible burst in star formation in the southwest region where YMC NGC 1313–379 is located.
Improving Astronomical Time-series Classification via Data Augmentation with Generative Adversarial Networks
Authors: García-Jara Germán , Protopapas Pavlos , Estévez Pablo A.
Published: August 2022

Due to the latest advances in technology, telescopes with significant sky coverage will produce millions of astronomical alerts per night that must be classified both rapidly and automatically. Currently, classification consists of supervised machine-learning algorithms whose performance is limited by the number of existing annotations of astronomical objects and their highly imbalanced class distributions. In this work, we propose a data augmentation methodology based on generative adversarial networks (GANs) to generate a variety of synthetic light curves from variable stars. Our novel contributions, consisting of a resampling technique and an evaluation metric, can assess the quality of generative models in unbalanced data sets and identify GAN-overfitting cases that the Fréchet inception distance does not reveal. We applied our proposed model to two data sets taken from the Catalina and Zwicky Transient Facility surveys. The classification accuracy of variable stars is improved significantly when training with synthetic data and testing with real data with respect to the case of using only real data.
Distances to Local Group Galaxies via Population II, Stellar Distance Indicators. I. The Sculptor Dwarf Spheroidal*
Authors: Tran Quang H. , Hoyt Taylor J. , Freedman Wendy L. , Madore Barry F. , Oakes Elias K. , Cerny William , Hatt Dylan , Beaton Rachael L.
Published: August 2022

We determine the distance to the Sculptor Dwarf Spheroidal via three Population II stellar distance indicators: (a) the Tip of the Red Giant Branch (TRGB), (b) RR Lyrae variables (RRLs), and (c) the ridgeline of the blue horizontal branch (HB). High signal-to-noise, wide-field VI imaging that covers an area

48
′

×

48
′

and reaches a photometric depth approximately 2 mag fainter than the HB was acquired with the Magellan-Baade 6.5 m telescope. The true modulus derived from Sculptor’s TRGB is found to be

μ

o

TRGB

=
19.59

±

0.07

stat

±

0.05

sys

mag. Along with periods adopted from the literature, newly acquired RRL phase points are fit with template light curves to determine

μ

W

I
,
V
−
I

RRL

=
19.60
±

0.01

stat

±

0.05

sys

mag. Finally, the HB distance is found to be

μ

o

HB

=
19.54
±

0.03

stat

±

0.09

sys

mag. Absolute calibrations of each method are anchored by independent geometric zero-points, utilize a different class of stars, and are determined from the same photometric calibration.
Accreted or Not Accreted? The Fraction of Accreted Mass in Galaxies from the Magneticum Simulations and Observations
Authors: Remus Rhea-Silvia , Forbes Duncan A.
Published: August 2022

In the two-phase scenario of galaxy formation, a galaxy’s stellar mass growth is first dominated by in-situ star formation, and subsequently by accretion. We analyze the radial distribution of the accreted stellar mass in ∼500 galaxies from the (48 Mpc/h)3 box volume of the hydrodynamical cosmological simulation Magneticum, in a stellar-mass range of 1010 to 1012
M
⊙. We find that higher-mass galaxies have larger accreted fractions, as found in previous works, but predict generally higher accretion fractions for low-mass galaxies. Based on the 3D radial distribution of the accreted and in-situ components, we define six galaxy classes, from completely accretion to completely in-situ dominated, and measure the transition radii between in-situ and accretion-dominated regions for galaxies that reveal a transition. About 70% of our galaxies have one transition radius. However, about 10% of the galaxies are accretion dominated everywhere, and about 13% have two transition radii, with the center and the outskirts both being accretion dominated. We show that these classes are strongly correlated with the galaxy merger histories, especially with the cold gas fraction at the time of merging. We find high total in-situ (low accretion) fractions to be associated with smaller, lower-mass galaxies, lower central dark-matter fractions, and larger transition radii. Finally, we show that the dips in observed surface brightness profiles seen in many early-type galaxies do not correspond to the transition from in-situ to accretion-dominated regions, and that any inferred mass fractions are not indicative of the true accreted mass but contain information about the galaxies’ dry-merger history.
SRGA J181414.6-225604: A New Galactic Symbiotic X-Ray Binary Outburst Triggered by an Intense Mass-loss Episode of a Heavily Obscured Mira Variable
Authors: De Kishalay , Mereminskiy Ilya , Soria Roberto , Conroy Charlie , Kara Erin , Anand Shreya , Ashley Michael C. B. , Boyer Martha L. , Chakrabarty Deepto , Grefenstette Brian , Hankins Matthew J. , Hillenbrand Lynne A. , Jencson Jacob E. , Karambelkar Viraj , Kasliwal Mansi M. , Lau Ryan M. , Lutovinov Alexander , Moore Anna M. , Ng Mason , Panagiotou Christos , Pasham Dheeraj R. , Semena Andrey , Simcoe Robert , Soon Jamie , Srinivasaragavan Gokul P. , Travouillon Tony , Yao Yuhan
Published: August 2022

We present the discovery and multiwavelength characterization of SRGA J181414.6-225604, a Galactic hard X-ray transient discovered during the ongoing SRG/ART-XC sky survey. Using data from the Palomar Gattini-IR survey, we identify a spatially and temporally coincident variable infrared (IR) source, IRAS 18111-2257, and classify it as a very-late-type (M7–M8), long-period (1502 ± 24 days), and luminous (M

K
≈ −9.9 ± 0.2) O-rich Mira donor star located at a distance of ≈14.6+2.9
−2.3 kpc. Combining multicolor photometric data over the last ≈25 yr, we show that the IR counterpart underwent a recent (starting ≈800 days before the X-ray flare) enhanced mass-loss (reaching ≈2.1 × 10−5
M
⊙ yr−1) episode, resulting in an expanding dust shell obscuring the underlying star. Multi-epoch follow-up observations from Swift, NICER, and NuSTAR reveal a ≈200 day long X-ray outburst reaching a peak luminosity of L
X ≈ 2.5 × 1036 erg s−1, characterized by a heavily absorbed (N
H ≈ 6 × 1022 cm−2) X-ray spectrum consistent with an optically thick Comptonized plasma. The X-ray spectral and timing behavior suggest the presence of clumpy wind accretion, together with a dense ionized nebula overabundant in silicate material surrounding the compact object. Together, we show that SRGA J181414.6-225604 is a new symbiotic X-ray binary in outburst, triggered by an intense dust-formation episode of a highly evolved donor. Our results offer the first direct confirmation for the speculated connection between enhanced late-stage donor mass loss and the active lifetimes of symbiotic X-ray binaries.
Are Active Galactic Nuclei in Post-starburst Galaxies Driving the Change or Along for the Ride?
Authors: Lanz Lauranne , Stepanoff Sofia , Hickox Ryan C. , Alatalo Katherine , French K. Decker , Rowlands Kate , Nyland Kristina , Appleton Philip N. , Lacy Mark , Medling Anne , Mulchaey John S. , Sazonova Elizaveta , Urry Claudia Megan
Published: August 2022

We present an analysis of 10 ks snapshot Chandra observations of 12 shocked post-starburst galaxies, which provide a window into the unresolved question of active galactic nuclei (AGN) activity in post-starburst galaxies and its role in the transition of galaxies from active star formation to quiescence. While seven of the 12 galaxies have statistically significant detections (with two more marginal detections), the brightest only obtained 10 photons. Given the wide variety of hardness ratios in this sample, we chose to pursue a forward-modeling approach to constrain the intrinsic luminosity and obscuration of these galaxies, rather than stacking. We constrain the intrinsic luminosity of obscured power laws based on the total number of counts and spectral shape, itself mostly set by the obscuration, with hardness ratios consistent with the data. We also tested thermal models. While all the galaxies have power-law models consistent with their observations, a third of the galaxies are better fit as an obscured power law and another third are better fit as thermal emission. If these post-starburst galaxies, early in their transition, contain AGNs, then these are mostly confined to lower obscuration (N

H
≤ 1023 cm−2) and lower luminosity (L
2−10 keV ≤ 1042 erg s−1). Two galaxies, however, are clearly best fit as significantly obscured AGNs. At least half of this sample shows evidence of at least low-luminosity AGN activity, though none could radiatively drive out the remaining molecular gas reservoirs. Therefore, these AGNs are more likely along for the ride, having been fed gas by the same processes driving the transition.
DustPy: A Python Package for Dust Evolution in Protoplanetary Disks
Authors: Stammler Sebastian M. , Birnstiel Tilman
Published: August 2022

Many processes during the evolution of protoplanetary disks and during planet formation are highly sensitive to the sizes of dust particles that are present in the disk: the efficiency of dust accretion in the disk and volatile transport on dust particles, gravoturbulent instabilities leading to the formation of planetesimals, or the accretion of pebbles onto large planetary embryos to form giant planets are typical examples of processes that depend on the sizes of the dust particles involved. Furthermore, radiative properties like absorption or scattering opacities depend on the particle sizes. To interpret observations of dust in protoplanetary disks, a proper estimate of the dust particle sizes is needed. We present DustPy: a Python package to simulate dust evolution in protoplanetary disks. DustPy solves gas and dust transport including viscous advection and diffusion as well as collisional growth of dust particles. DustPy is written with a modular concept, such that every aspect of the model can be easily modified or extended to allow for a multitude of research opportunities.
Jets from Accretion Disk Dynamos: Consistent Quenching Modes for Dynamo and Resistivity
Authors: Mattia Giancarlo , Fendt Christian
Published: August 2022

Astrophysical jets are launched from strongly magnetized systems that host an accretion disk surrounding a central object. The origin of the magnetic field, which is a key component of the launching process, is still an open question. Here we address the question of how the magnetic field required for jet launching is generated and maintained by a dynamo process. By carrying out nonideal MHD simulations (PLUTO code), we investigate how the feedback of the generated magnetic field on the mean-field dynamo affects the disk and jet properties. We find that a stronger quenching of the dynamo leads to a saturation of the magnetic field at a lower disk magnetization. Nevertheless, we find that, while applying different dynamo feedback models, the overall jet properties remain unaffected. We then investigate a feedback model that encompasses a quenching of the magnetic diffusivity. Our modeling considers a more consistent approach for mean-field dynamo modeling simulations, as the magnetic quenching of turbulence should be considered for both a turbulent dynamo and turbulent magnetic diffusivity. We find that, after the magnetic field is saturated, the Blandford–Payne mechanism can work efficiently, leading to more collimated jets, which move, however, with slower speed. We find strong intermittent periods of flaring and knot ejection for low Coriolis numbers. In particular, flux ropes are built up and advected toward the inner disk thereby cutting off the inner disk wind, leading to magnetic field reversals, reconnection and, the emergence of intermittent flares.
Chemodynamical Signatures of Bar Resonances in the Galactic Disk: Current Data and Future Prospects
Authors: Wheeler Adam , Abril-Cabezas Irene , Trick Wilma H. , Fragkoudi Francesca , Ness Melissa
Published: August 2022

The Galactic disk exhibits complex chemical and dynamical substructure thought to be induced by the bar, spiral arms, and satellites. Here, we explore the chemical signatures of bar resonances in action and velocity space, and characterize the differences between the signatures of corotation (CR) and higher-order resonances using test particle simulations. Thanks to recent surveys, we now have large data sets containing metallicities and kinematics of stars outside the solar neighborhood. We compare the simulations to the observational data from Gaia EDR3 and LAMOST DR5 and find weak evidence for a slow bar with the “hat” moving group (250 km s−1 ≲ v

ϕ
≲ 270 km s−1) associated with its outer Lindblad resonance and “Hercules” (170 km s−1 ≲ v

ϕ
≲ 195 km s−1) with CR. While constraints from current data are limited by their spatial footprint, stars closer in azimuth than the Sun to the bar’s minor axis show much stronger signatures of the bar’s outer Lindblad and CR resonances in test particle simulations. Future data sets with greater azimuthal coverage, including the final Gaia data release, will allow reliable chemodynamical identification of bar resonances.
GECAM Detection of a Bright Type I X-Ray Burst from 4U 0614+09: Hint for Its Spin Frequency at 413 Hz
Authors: Chen Yu-Peng , Li Jian , Xiong Shao-Lin , Ji Long , Zhang Shu , Peng Wen-Xi , Qiao Rui , Li Xin-Qiao , Wen Xiang-Yang , Song Li-Ming , Zheng Shi-Jie , Song Xin-Ying , Zhao Xiao-Yun , Huang Yue , Lu Fang-Jun , Zhang Shuang-Nan , Xiao Shuo , Cai Ce , An Zheng-Hua , Chang Zhi , Chen Can , Chen Gang , Chen Wei , Dai Guang-Qi , Du Yan-Qi , Gao Min , Gong Ke , Guo Dong-Ya , Guo Zhi-Wei , He Jian-Jian , Li Bin , Li Chao , Li Chao-Yang , Li Gang , Li Jian-Hui , Li Lu , Li Qing-Xin , Li Xiao-Bo , Li Yan-Guo , Liang Jing , Liang Xiao-Hua , Liao Jin-Yuan , Liu Jia-Cong , Liu Xiao-Jing , Liu Ya-Qing , Luo Qi , Ma Xiang , Meng Bin , Ou Ge , Shi Dong-Li , Shi Jing-Yan , Sun Gong-Xing , Sun Xi-Lei , Tuo You-Li , Wang Chen-Wei , Wang Hui , Wang Huan-Yu , Wang Jin , Wang Jin-Zhou , Wang Ping , Wang Wen-Shuai , Wang Yu-Xi , Wen Xing , Wu Hong , Xie Sheng-Lun , Xu Yan-Bing , Xu Yu-Peng , Xue Wang-Chen , Yang Sheng , Yao Min , Ye Jian-Ying , Yi Qi-Bin , Zhang Cheng-Mo , Zhang Chao-Yue , Zhang Da-Li , Zhang Fan , Zhang Fei , Zhang Hong-Mei , Zhang Kai , Zhang Peng , Zhang Xiao-Lu , Zhang Yan-Qiu , Zhang Zhen , Zhao Guo-Ying , Zhao Shi-Yi , Zhao Yi , Zheng Chao , Zhou Xing , Zhu Yue
Published: August 2022

One month after launching the Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor, a bright thermonuclear X-ray burst from 4U 0614+09 was observed on 2021 January 24. We report the time-resolved spectroscopy of the burst and a hint of burst oscillation at 413 Hz with a fractional amplitude ∼2.0% (rms). This coincides with the burst oscillation previously discovered with Swift/Burst Alert Telescope (Strohmayer et al. 2008), and therefore supports the spin frequency of this source. This burst is a bright one in the normal bursts detected from 4U 0614+09, which leads to an upper limit of distance estimation of 3.1 kpc. The folded light curve during the burst oscillation shows a sinusoidal structure, which is consistent with previous observations.
MAXI J1535–571 2017 Outburst Seen by INTEGRAL/SPI and Investigating the Origin of Its Hard Tail
Authors: Rodi James , Jourdain E. , Roques J. P.
Published: August 2022

On 2017 September 2 MAXI J1535–571 went into outburst and peaked at ∼5 Crab in the 2–20 keV energy range. Early in the flare, the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) performed target of opportunity pointings and monitored the source as it transitioned from the hard state to the soft state. Using quasi-simultaneous observations from MAXI/GSC and INTEGRAL/SPI, we studied the temporal and spectral evolution of MAXI J1535–571 in the 2–500 keV range. Early spectra show a Comptonized spectrum and a high-energy component dominant above ∼150 keV. CompTT fits to the SPectrometer on INTEGRAL (SPI) data found electron temperatures (kT

e
) evolve from ∼31 keV to 18 keV with a tied optical depth (τ ∼ 0.85) or τ evolving from ∼1.2–0.65 with a tied kT

e
(∼24 keV). To investigate the nature of the high-energy component, we performed a spectral decomposition of the 100–400 keV energy band. The CompTT flux varies significantly during the hard state while the high-energy component flux is consistent with a constant flux. This result suggests that the two components originate from different locations, which favors a jet origin interpretation for the high-energy component over a hybrid corona interpretation. Lastly, two short rebrightenings during the hard-to-soft transition are compared to similar events reported in MAXI J1820+070.
Stability Evaluation of Caulerpa racemosa as Novel Halal Capsule-Shell
Authors: Permatasari Happy Kurnia , Nurkolis Fahrul , Barazani Hero , Satria Piko , Prima Eka Nugraha , Alfaien Panca Aghniaa Ruuhu , Choirunnisa Naura Luviezka , Kumalawati Dian Aruni , Solihah Jumailatus , Pramesti Dias Idha , Bolang Alexander
Published: August 2022

BACKGROUND: The capsule shell is generally made from mammalian gelatin; according to Europe gelatine manufacturers of Europe, about 80% of the base material of the capsule shell comes from pork skin and 15% from cow skin. This raises a great deal of concern in the community, especially on the religious aspect. Muslims are prohibited from consuming anything made from pork, while Hindus are forbidden from consuming anything made from beef. To reduce public concern, an alternative medicine shell made from natural ingredients is necessary.

AIM: This study aims to discover the potential of a new medicinal shell, which is made from the stem of sea grapes (Caulerpa racemosa).

METHODS: This laboratory experimental study used a completely randomized design with three treatment variations, namely, the ratio between the volume of chitosan and tripolyphosphate in Sample 1 (V1) was 2:1, Sample 2 (V2) was 3.5:1, and Sample 3 (V3) is 5:1. Each sample was replicated 3 times (triples) and used the analytical method of the association of official analytical chemists. The dough is then printed on capsules of size O (300–500 mg; 0.5 g).

RESULTS: The results obtained are the particle size, polydispersity index, and zeta potential of V1, V2, and V3 that are significantly different (p < 0.0001, p = 0.0004, and p < 0.0001) based on the one-way Analysis of variance test.

CONCLUSION: From these results, the V3 nanocapsule variant is the best variant and has the potential to be an alternative to drug capsule shells.
Spectral theory of spin substitutions
Authors: Frank Natalie Priebe , Mañibo Neil
Published: August 2022

We introduce substitutions in \begin{document}$ {\mathbb{Z}}^m $\end{document} which have non-rectangular domains based on an endomorphism \begin{document}$ Q $\end{document} of \begin{document}$ {\mathbb{Z}}^m $\end{document} and a set \begin{document}$ {\mathcal D} $\end{document} of coset representatives of \begin{document}$ {\mathbb{Z}}^m/Q{\mathbb{Z}}^m $\end{document}, which we call digit substitutions. Using a finite abelian 'spin' group we define 'spin digit substitutions' and their subshifts \begin{document}$ ({\Sigma}, {\mathbb{Z}}^m) $\end{document}. Conditions under which the subshift is measure-theoretically isomorphic to a group extension of an \begin{document}$ m $\end{document}-dimensional odometer are given, inducing a complete decomposition of the function space \begin{document}$ L^{2}({\Sigma},\mu) $\end{document}. This enables the use of group characters in \begin{document}$ {\widehat{G}} $\end{document} to derive substitutive factors and analyze the spectra of specific subspaces. We provide general sufficient criteria for the existence of pure point, absolutely continuous, and singular continuous spectral measures, together with some bounds on their spectral multiplicity.
The general maximum principle for stochastic control problems with singular controls
Authors: Song Yuanzhuo , Wu Zhen
Published: August 2022

We consider a stochastic control problem with an absolutely continuous control and a singular control. The control domain of the two kinds of admissible controls need not to be convex. We obtain two maximum principles respectively by applying spike variation to these two kinds of optimal controls.
Pathless directed topology in connection to the circulation of blood in the heart of human body
Authors: Othman Hakeem A. , Al-Shamiri Mohammed M. , Saif Amin , Acharjee Santanu , Lamoudan Tarik , Ismail Rashad
Published: August 2022

We introduce a topology on the set of vertices of a directed graph and we call the topological space as pathless directed topological space. We study relation between the relative topologies and pathless directed topological spaces of E-generated subdirected graphs. Then, we study connectedness, isomorphic and homeomorphic properties in digraphs and pathless directed topological spaces. Moreover, we apply our results to blood circulation process in human heart and disprove Shokry and Aly [M. Shokry and R. E. Aly, Topological properties on graph vs medical application in human heart, Int. J. Appl. Math., 15 (2013), 1103-1109], Nada et al. [S. Nada, A. E. F. El Atik and M. Atef, New types of topological structures via graphs, Math. Method. Appl. Sci., 41 (2018), 5801-5810] and Nawar et al. [A. S. Nawar and A. E. F. A. El-Atik, A model of a human heart via graph nano topological spaces, Int. J. Biomath., 12 (2019), p.1950006]. We show that pathless directed topology is accurately describing the circulation of blood in the heart of human body.
Design and application of improved sparrow search algorithm based on sine cosine and firefly perturbation
Authors: Ren Xiangyang , Chen Shuai , Wang Kunyuan , Tan Juan
Published: August 2022

Swarm intelligence algorithms are relatively simple and highly applicable algorithms, especially for solving optimization problems with high reentrancy, high stochasticity, large scale, multi-objective and multi-constraint characteristics. The sparrow search algorithm (SSA) is a kind of swarm intelligence algorithm with strong search capability, but SSA has the drawback of easily falling into local optimum in the iterative process. Therefore, a sine cosine and firefly perturbed sparrow search algorithm (SFSSA) is proposed for addressing this deficiency. Firstly, the Tent chaos mapping is invoked in the initialization population stage to improve the population diversity; secondly, the positive cosine algorithm incorporating random inertia weights is introduced in the discoverer position update, so as to improve the probability of the algorithm jumping out of the local optimum and speed up the convergence; finally, the firefly perturbation is used to firefly perturb the sparrows, and all sparrows are updated with the optimal sparrows using the firefly perturbation method to improve their search-ability. Thirteen benchmark test functions were chosen to evaluate SFSSA, and the results were compared to those computed by existing swarm intelligence algorithms, as well as the proposed method was submitted to the Wilcoxon rank sum test. Furthermore, the aforesaid methods were evaluated in the CEC 2017 test functions to further validate the optimization efficiency of the algorithm when the optimal solution is not zero. The findings show that SFSSA is more favorable in terms of algorithm performance, and the method's searchability is boosted. Finally, the suggested algorithm is used to the locating problem of emergency material distribution centers to further validate the feasibility and efficacy of SFSSA.
Machine fault detection methods based on machine learning algorithms: A review
Authors: Ciaburro Giuseppe
Published: August 2022

Preventive identification of mechanical parts failures has always played a crucial role in machine maintenance. Over time, as the processing cycles are repeated, the machinery in the production system is subject to wear with a consequent loss of technical efficiency compared to optimal conditions. These conditions can, in some cases, lead to the breakage of the elements with consequent stoppage of the production process pending the replacement of the element. This situation entails a large loss of turnover on the part of the company. For this reason, it is crucial to be able to predict failures in advance to try to replace the element before its wear can cause a reduction in machine performance. Several systems have recently been developed for the preventive faults detection that use a combination of low-cost sensors and algorithms based on machine learning. In this work the different methodologies for the identification of the most common mechanical failures are examined and the most widely applied algorithms based on machine learning are analyzed: Support Vector Machine (SVM) solutions, Artificial Neural Network (ANN) algorithms, Convolutional Neural Network (CNN) model, Recurrent Neural Network (RNN) applications, and Deep Generative Systems. These topics have been described in detail and the works most appreciated by the scientific community have been reviewed to highlight the strengths in identifying faults and to outline the directions for future challenges.
CONFIGURAÇÃO URBANA NA DISPONIBILIDADE DE LUZ NATURAL NO AMBIENTE CONSTRUÍDO
Authors: Mota Beck Luciana , Ruttkay Pereira Fernando Oscar
Published: August 2022

As formas urbanas são controladas pelos regulamentos que podem não ser suficientes para assegurar o desempenho da luz natural no interior dos ambientes de todos os pavimentos de uma edificação. Diante disso, este artigo analisa a combinação de índices urbanos (índice de aproveitamento – IA, taxa de ocupação – TO e gabarito) e do índice de performance (Autonomia Espacial da Luz Natural – sDA300,50%), considerando cenários de bloco isolado no lote, para a cidade de Florianópolis. Outros parâmetros são avaliados: ângulo de obstrução vertical,  porcentagem de céu visível e índice de espaço aberto – OSR, que relaciona a área construída total com a área aberta. Como resultados da pesquisa, são identificados valores de OSR, ângulo máximo de obstrução e porcentagem mínima de céu visível, correspondentes ao sDA igual a 45%, para que cenários de diferentes IA, TO e gabarito, obtenham desempenho satisfatório. As análises realizadas gradualmente permitem desenvolver estratégias específicas por pavimento, colaborando na escolha da configuração mais adequada para uma determinada condição de projeto. Verificou-se que as regras urbanas criadas a partir da escala do lote, restringem a criatividade arquitetônica, pois limitam a disposição dos arranjos espaciais e a geometria das edificações, importantes requisitos para a qualidade arquitetônica, urbana e de conforto.
Palavras-chave: Forma urbana. Índices urbanos. Luz natural.
Team-Based Collaborative Practices
Authors: Dunham Wendi Marissa , Floyd Kimberly K. , Lockwood Debra , McFarland-Whisman Jennifer
Published: August 2022

Collaboration is a team-based professional partnership in which structured but shared problem-solving processes are used to reach a common goal. This chapter highlights theoretical frameworks and collaboration models. Barriers to communication are discussed as well as various collaboration models. Project-based collaboration is described as well as ways to be effective within this model. Case-based learning collaboration is also discussed. A final evidence-based model for collaboration in communities of practice that can supplement based on case-based instruction using teacher discussion and participatory learning is presented. Communities of practice have been defined by Kirchnera and Laib as environments where individuals who share common interests regarding a problem or subject exchange ideas, develop solutions, and construct knowledge as part of an ongoing social learning process that occurs over a long period of time.
Co-Teaching in Higher Education for Multi-Perspective Learning
Authors: Cassidy Kimberly D.
Published: August 2022

Co-teaching is one of several instructional methods used in the clinical model to educate pre-service teachers. The clinical model, implemented by Shawnee State University (SSU) since the 2014-2015 school year, is a P-12 learner/school/community focused practice where P-12 learning is the priority. This differs from the traditional student teaching model, which is a course-based teacher preparation practice focused on the pre-service teacher and college. This chapter will share the experiences of two SSU professors who teamed up to provide a team-teaching model in the higher education classroom that supported the clinical model tenants.
Faith Goes to College
Authors: Singleton Harry
Published: August 2022

This chapter is concerned with the spirit and mindset of Black denominational leaders at the end of the Civil War regarding the building of HBCUs. It argues that Black church leaders across denominations were interested in providing a foundation that would outlive them and the formal education of their children and posterity would be the key component of that foundation. Structurally, this chapter addresses the vision of Black denominational leaders by looking at the lessons learned from the history of bondage, how that history informed the pragmatic thrust of the building of HBCUs, and how they desired those HBCUs serve the community for each subsequent generation where racial antagonisms are concerned. The chapter gives ultimate attention to the theological implications inherent in Black denominational leaders starting “secular” institutions like HBCUs and how that commitment challenges long-standing theological assumptions about Black religious leaders and the Black church regarding asocial and escapist tendencies.
Community Activism and Impacting Communities Through High Impact Educational Practice
Authors: Bivens Nicola Davis , Quick Deborah Brown , Miller DeMond S. , Bledsoe-Gardner Anita D. , Byrd Yolanda Meade
Published: August 2022

Almost since their inception, faculty at Historically Black Colleges and Universities have prepared and promoted their students to be actively engaged as advocates and activists within their communities. For nearly 40 years, through experiential and constructivist learning, primarily in the form of service learning, community-based participatory research, and internships, the Criminology program at Johnson C. Smith University has utilized the various pedagogy to address public safety, health, and other social problems to promote equity. Each of these strategies are deemed effective as high impact practices by the American Association of Colleges and Universities. This chapter is an examination of the experiences of JCSU faculty and their students in affecting change while promoting advocacy and civic responsibility. These strategies have also served as effective pedagogy, a method of student and program assessment, and allow the authors to provide good will beyond their gates.
Howard University's Latínx Legacy
Authors: Stinchcomb Dawn F.
Published: August 2022

While some may believe that the study of the history of Afro Latin American and Afro Hispanic Studies, an academic discipline devoted to the study of the history, religions, languages, and geography of African-descended people in the Americas, developed independently of African American Studies in the United States, this chapter reveals that all research of the African Diaspora began outside of academia among self-taught historians and bibliophiles. The Black intellectual elite, founders, administrators, and scholars from historically Black institutions developed these academic areas to elicit pride in the accomplishments of their ancestors. Professors in the Romance languages at Howard University were some of the first to teach their students about Blacks in the history of Latin America and Europe who made contributions to the humanities. With this in mind, this chapter discusses the origins of Afro Latin American/Afro Romance and Afro Hispanic Studies in the United States, crediting professors at Howard University as the founders of this branch of African Diasporic Studies.
A New Look
Authors: Rush Amani
Published: August 2022

This chapter outlines three main contributions of HBCU museums: as educational spaces, as spaces that shape identity, and as community-building spaces. The author discusses the benefits of HBCU museums for students, faculty, and administrators. Discussion of the possibilities for identity development and the active engagement of these institutions is also included. In evaluating several HBCU museums and their ability to create meaningful visitor experiences, this chapter includes suggestions for future research.
Intelligent RFQ Summarization Using Natural Language Processing, Text Mining, and Machine Learning Techniques
Authors: Trappey Amy J. C. , Chang Ai-Che , Trappey Charles V. , Chien Jack Y. C. Chang
Published: August 2022

Request for quotation (RFQ) is a lengthy document soliciting vendor products and services according to rigid specifications. This research develops an integrated natural language processing (NLP), text mining, and machine learning approach for intelligent RFQ summarization. Over 1,300 power transformer RFQ requests are used to build a word-embedding model for training and testing. Domain keywords are extracted using N-gram TF-IDF. The method automatically extracts essential specifications such as voltage, capacity, and impedance from RFQs using text analytics. The K-means algorithm groups the sentences of each specification. The TextRank algorithm identifies important sentences of all specifications to generate RFQ summaries. The summarization system helps engineers shorten the time to identify all specifications and reduces the risk of missing important requirements during manual RFQ reading. The system helps improve the complex product design for manufacturers and improve the cost estimation and competitiveness of quotations in a highly competitive marketplace.
Effect of Sn Content on Structure and Piezoelectric Properties of Pb(Zr0.35Ti0.65)1-xSnxO3
Authors: Haroon Haseeb , Sarfraz Zahid , Shuaib Muhammad , Saleem Muhammad , Rauf Abdul , Abbas Nasir , Luqman Muhammad
Published: August 2022

Pb (Zr0.35Ti0.65)1-xSnxO3 (PZST) piezoelectric ceramics with ABO3 perovskite structure were synthesized using Solid state reaction technique. The piezoelectric, ferroelectric and dielectric behavior of PZST piezoceramics was studied systematically by varying the amount of Sn at fixed Zr/Ti ratio. It was found that sample containing Sn= 0.26 exhibit maximum piezoelectric coefficient of 324 pC/N and minimum tangent loss of 0.009. Decrease in tetragonality and Curie Temperature (Tc) was observed with the increase of Sn content. The polarization–electric field hysteresis loops for all compositions were studied and it was observed that the sample containing Sn= 0.26 exhibit maximum polarization of 0.3C/m2. The synthesized PZST compositions can be utilized for Pressure sensors and maritime SONAR applications. Keywords: Piezoelectric, PZST ceramics, ferroelectric, Domains
Polypropylene/CaCO3 Nanocomposites Fabricated Using Masterbatch: Effect of Nano-CaCO3 Loadings and Re-Processing on the Melting Properties
Authors: Chafidz Achmad
Published: August 2022

Polypropylene filled calcium carbonate (CaCO3) nanocomposites were fabricated by employing melt blending/compounding method using masterbatch. To investigate the efffect of reprocessing on the melting properties of PP/CaCO3 nanocomposites, the melt compounding process was conducted twice (two cycles). The effect of nano-CaCO3 loadings (i.e. 5, 10 and 15 wt%) on the melting properties of PP/CaCO3 nanocomposites were also studied. The meling properties of the nanocomposites were analyzed by using a DSC (Differential Scanning Calorimetry). Additionally, the nanocomposites samples were also analyzed by an SEM (Scanning Electron Microscopy). The SEM analysis results revealed that at higher nano-CaCO3 loading (i.e. 15 wt%), the nano-CaCO3 particles in the 2nd cycle were more well distributed/dispersed in the polypropylene matrix as compared to the 1st cycle. Whereas, the DSC test results showed that the crystallinity of the nanocomposites samples were similar to that of neat PP for the 1st cycle of melt blending process, which was about 41%. In the other hand, for the 2nd cycle, the crystallinity of the samples slightly increased wtih increasing nano-CaCO3 loadings, which were about 39.6; 43; 44% for nano-CaCO3 loadings of 0, 5, 10 wt%, respectively. Nevertheless, at the highest nano-CaCO3 loadings (i.e. 15 wt%), the crystallinity of the nanocomposites (i.e. NCC-15-II) decreased again and lower than that of neat PP, which was about 37.7%.
Kinetic Study of Polymerization Reaction of Bisphenol a Diglycidyl Ether and Terephthalic Acid
Authors: Romadhona Rizky , Rochmadi  , Ariyanto Teguh , Hartanto Danang Tri
Published: August 2022

Epoxy resin as a polymer material with good mechanical and electrical characteristics and resistance from corrosion and moisture resistance are considered to have the potential to be applied in defense field. The research aimed to investigate the kinetics of the reaction between bisphenol A diglycidyl ether (DGEBA) and terephthalic acid (TPA). The reaction between the DGEBA and TPA was carried out for 2 h. Then, the samples of the reaction product were taken at 15, 30, 45, 60, 90 and 120 min and were analyzed for their acid number. To determine the effect of temperature on the reaction, the reaction was carried out at various temperatures of 30 °C, 50 °C, 60 °C and 75 °C. Furthermore, the effect of variation of DGEBA and TPA mole ratio was carried out using the ratio of 0.8:1; 1:1; 1.2:1; 1.4:1. By comparing the experimental data with the calculated reaction kinetics equation data, the proposed reaction model had an average relative error of 4.63% for the temperature variation and a relative error of 7.02% for the variation of mole ratio reactants.
Development of a Test Bench for the Investigation of Thermoplastic-Thermoset Material Combinations in Additive Manufacturing
Authors: Schreil Daniela , Zhilev Georgi , Matschinski Alexander , Drechsler Klaus
Published: August 2022

To enhance the mechanical properties of fused filament fabricated parts, the process integrates continuous fibers. Currently, fibers are impregnated either with thermoplastics or with thermoset material, which is completely cured before printing and later combined with thermoplastic filament during the coextrusion process. A major problem about using cured thermoset matrix for the fibers is an insufficient bond between the fiber matrix and the thermoplastic material. A new approach proposed by the authors combine uncured thermoset matrices with thermoplastic filaments to form a substance-to-substance bond. To investigate the material and bonding behavior, a test bench is constructed. Its main purpose is to replicate the coextrusion of thermoplastic filament and thermoset impregnated continuous fibers. Parameters, such as temperature, tension and extrusion speed can be adjusted within the setup to accurately simulate the additive manufacturing process. Aluminum blocks including heater cartridges and thermocouples act as hot ends and impregnation units. Heated blocks compact the fiber strands. We tested different heating blocks containing flat and curved geometries including actual additive manufacturing nozzles to evaluate the impregnation behavior of the dry carbon fiber filaments. Approaches with additive manufacturing nozzles show the most promising results regarding fiber impregnation with thermoplastic material.
CO2 Hydrate Thermodynamic and Crystallographic Characterization below the Freezing Point under Low Subcooling
Authors: Li Yan , Gambelli Alberto Maria , Rossi Federico
Published: August 2022

In this study, CO2 hydrate formation-decomposition experiments were carried out below the freezing point in a lab-scale reactor and the in-situ high-pressure optical cell. It was found that, in the low subcooling temperature range below 0 °C, ice formation competed with hydrates. Initially, ice occupied most of the space and hydrates had limited space to grow. On the other side, it would reduce the contact between gas and liquid water, thus hindering the process. Finally, the ice dissolved and the hydrate growth dominated in the system. Otherwise, hydrate crystals grew in supercooled water in the micron-sized tube. Here we provided a comparison between macro and micro-scale properties, which revealed the competition relationship between ice and hydrates, and consequently, it was difficult to define equilibrium curves with similar methods at temperatures below the ice-point.
Experimental Study of MQL Performance on the Titanium Material Drilling Process
Authors: Alayaini Mustafa , Rizal Muhammad , Iqbal Mohd , Dirhamsyah Muhammad
Published: August 2022

This titanium material is very difficult to machine due to its low thermal conductivity resulting in heat generated when machining accumulates in the cutting zone. This causes the thermal effect to be absorbed in the drill tool so that the tool wears out quickly which affects the quality of the hole. This study aims to examine the effect of tool wear on the cutting force of hole quality under dry machining conditions and machining using the MQL method. The cutting force resulting from the process of drilling holes using MQL is smaller than drilling in dry conditions. The larger the feed (f), the greater the cutting force (N) that is generated during the drilling process in dry conditions and MQL conditions. The greater the cutting speed (v) used during the drilling process, the lower the cutting force generated
Effect of Oil Quenching and Shot Peening to Improve Hardness Behavior of S45C Carbon Steel
Authors: Priyambodo Bambang Hari , Margono  , Nugroho Kacuk Cikal , Atmoko Nugroho Tri , Yaqin Rizqi Ilmal
Published: August 2022

S45C carbon steel is widely used as a raw material for tools and automotive components. In machine components, a material that has hard and ductile properties is also needed, with this problem, of course, it is necessary to have material engineering to improve the mechanical properties of steel in order to obtain good quality. The heat treatment process on the material has the advantage of improving mechanical properties. The purpose of this study was to determine the effect of heat treatment and shot peening on the mechanical properties and microstructure of the S45C carbon steel surface. S45C carbon steel was heat-treated at 900 oC and held for 15 minutes, then quenched using oil media. Next, the shot peening process was carried out with pressure variations of 4, 5, 6, and 7 bar for 20 minutes. Hardness testing was carried out using micro Vickers with a load of 0.49 N for 10 seconds. The results of the heat treatment on S45C material experienced an increase in hardness of 251.56 VHN compared to non-treatment, namely 187.38 VHN. Specimens that have been heated treated and shot peening with pressure variations of 4, 5, 6, and 7 bar experienced an increase in hardness of 286.18, 289.22, 357.24, and 450.22 VHN. The microstructure of the heat treatment material is formed by the phases of ferrite, pearlite, and martensite. The pearlite structure is denser and denser, showing increased hardness compared to non-treated S45C. Furthermore, the cross-sectional microstructure shows the depth of the shot peening effect as far as 130 μm. The surface of the specimen has a denser structure than the raw material.
Rice Husk Ash Extraction Applied for Biosilica Reinforced Tire Tread Filler Compound
Authors: Anggraini Lydia , Sutisna Nanang , Hernawan Rendi
Published: August 2022

In the agricultural countries, rice husk is an abundant waste, especially as one of the largest sources of silica (SiO2) production that can be produced. By complete combustion, to about 87% - 97% SiO2 content can be produced from rice husks. Alkaline solution is used as a solvent in the solid-liquid extraction production of rice husk ash SiO2. The mass of 10 grams of rice husk ash was weighed for the extraction process added with 80 ml of potassium hydroxide (KOH) solution with 10%, 15% and 20% various concentration to extract the SiO2 content. In a systematic study, for 60 minutes the rice husks were soaked and washed using HCl and then heated in a muffle furnace. The results of this study showed that all samples are succeeded in homogenizing SiO2 with purity close to 90%. Furthermore, through Energy-Dispersive X-ray Spectroscopy (EDS) analysis was proven these results obtained through solid-liquid extraction of KOH from rice husks. Natural SiO2, known as biosilica, is useful and has potential in reinforcing compounds, including applications as filler in tires and natural rubber compounds.