bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Novel Biogenic nanoparticles for antimicrobial traits
Authors: Kumar Arun , Sharma Deepanjali , Balasubramaniam Bhuvaneshwari , Thakur Rahul , Saini Reena V. , Gupta Raju K , Mittal Divya , Saini Adesh K.
Published: July 2022

Nanotechnology is a better approach to dealing with the current challenges of phytopathogens in agriculture and the environment. Nanoparticles (NPs) are less time-consuming, non-toxic and environmentally friendly and provide a high yield compared to conventional synthesis of NPs. Using plant growth promoting (PGP) bacterial strain for the synthesis of nanoparticles can route out the challenges of using chemical-based fertilizers and pesticides for agriculture. In our study, silver nanoparticles (AgNPs) were synthesized by using Burkholderia sp. 15B, which were further characterized by various physical techniques. All the techniques suggested the formation of biogenic NPs. We found that the bacteria-based NPs were able to hamper the growth of phytopathogenic fungi by more than 80%, as examined by the inhibition of fungal growth in the presence of green NPs. In addition, the synthesized NPs efficiently rescued seedlings from phytopathogenic fungal invasion. The results implicate the use of microorganism-mediated AgNPs as pesticides over chemical-based pesticides.
PRELIMINARY PHYTOCHEMICAL ANALYSIS OF ANTIFERTILITY PLANTS
Authors:   Research Scholar, Vinayaka Misson’s College of Pharmacy Vinayaka Misson’s Research Foundation (Deemed to be University), Salem–636008, Sarma Sai Koteswar , Umamaheswari D ,   Professor, Department of Pharmaceutical Analysis, Vinayaka Misson’s College of Pharmacy, Vinayaka Misson’s Research Foundation (Deemed to be University), Salem–636008, Venkateswaralu B S ,   Professor & Principal, Vinayaka Misson’s College of Pharmacy Vinayaka Misson’s Research Foundation (Deemed to be University), Salem–636008, Kumar M ,   Professor & Head, Department of Pharmaceutical Chemistry, Vinayaka Misson’s College of Pharmacy Vinayaka Misson’s Research Foundation (Deemed to be University), Salem– 636008
Published: July 2022

The objective of this study was to investigate the presence of various phytochemicals obtained from ethanol (E), ethyl acetate (ET), methanol (M), and chloroform (C) extracts of the Datura Stramonium and Musa Paradasica. Methods: The freshly collected plant materials were subjected to successive extraction separately using E,ET, M and C with soxhlet apparatus. Using the standard protocols, the leaf extracts obtained were subjected to preliminary phytochemical analysis to detect the presence of carbohydrates, proteins, steroids, flavonoids, tannins, and alkaloids. Results: The phytochemical analysis showed the presence of tannins, flavonoids, alkaloids, terpenoids, glycosides, saponins, resins, carbohydrates and proteins. The Datura Stramonium and Musa Paradasica plants showed the presence of flavonoids, terpenoids, glycosides, carbohydrates and proteins. Flavonoids, alkaloids, terpenoids, glycosides, resins, carbohydrates and proteins are found in the leaves of Datura Stramonium. Flavonoids, glycosides and resins were found in the leaves of Musa Paradasica. Ethanol and methanol leaf extracts from Datura Stramonium and Musa Paradasica indicated that they contained most of thephytochemicalcompounds. Conclusion: The different extracts of plants have clearly indicated the presence of all the major phytochemicals; hence, these plants can be used for the extraction of bioactive compounds. Keywords: Phytochemicals,Datura Stramonium and Musa Paradasica
The effect of driver age and working hours on increased motorcycle accidents with the COVID-19 pandemic: a cross-sectional case study
Authors: KAYA Murat , KART Hayati , TUNÇ Oytun Derya , ÇATAL Samed , BÜYÜKTOPÇU Ömer , ŞİRİN Evrim
Published: July 2022

Aim: In the present study, the purpose was to investigate the effects of environmental and personal risk factors on accidents in the motor courier business, which expanded with the pandemic.

Material and Method: A total of 227 patients who applied to the Emergency Department after motorcycle accidents between After Pandemic (AP) March 2020-March 2022 and Before Pandemic (BP) March 2018-March 2020 period were included in the study. Statistical differences were analyzed regarding the number of motorcycle accidents before and after the pandemic, the occupation of the patients, driving experiences, weather conditions, and the timing of the accident.

Results: No statistically significant differences were detected between the mean age, gender distribution, occupational distribution, accident occurrence time, and duration of experience of the patients in motorcycle accidents admitted to the Emergency Department (p>0.05). Statistically significant differences were detected between the weekly working hours of the patients BP and AP (p
Exploring the Hadronic Origin of LHAASO J1908+0621
Authors: De Sarkar Agnibha , Gupta Nayantara
Published: July 2022

Recent observations by the Large High Altitude Air Shower Observatory (LHAASO) have paved the way for the observational detection of PeVatrons in the Milky Way, thus revolutionizing the field of γ-ray astrophysics. In this paper, we study one such detected source, LHAASO J1908+0621, and explore the origin of multi-TeV γ-ray emission from this source. A middle-aged radio supernova remnant SNR G40.5–0.5 and a GeV pulsar PSR J1907+0602 are cospatial with LHAASO J1908+0621. Dense molecular clouds are also found to be associated with SNR G40.5–0.5. We explain the multi-TeV γ-ray emission observed from the direction of LHAASO J1908+0621, by the hadronic interaction between accelerated protons that escaped from the SNR shock front and cold protons present inside the dense molecular clouds, and the leptonic emission from the pulsar wind nebula (PWN) associated with the pulsar J1907+0602. Moreover, we explain lower energy γ-ray emission by considering the radiative cooling of the electrons that escaped from SNR G40.5–0.5. Finally, the combined lepto-hadronic scenario was used to explain the multiwavelength spectral energy distribution of LHAASO J1908+0621. Although not yet significant, an IceCube hotspot of neutrino emission is spatially associated with LHAASO J1908+0621, indicating a possible hadronic contribution. In this paper, we show that if a hadronic component is present in LHAASO J1908+0621, then the second-generation IceCube observatory will detect neutrinos from this source.
Opacity of the Highly Ionized Lanthanides and the Effect on the Early Kilonova
Authors: Banerjee Smaranika , Tanaka Masaomi , Kato Daiji , Gaigalas Gediminas , Kawaguchi Kyohei , Domoto Nanae
Published: July 2022

We investigate the effect of the presence of lanthanides (Z = 57–71) on the kilonova at t ∼ 1 hr after the neutron star merger for the first time. For this purpose, we calculate the atomic structures and the opacities for selected lanthanides: Nd (Z = 60), Sm (Z = 62), and Eu (Z = 63). We consider the ionization degree up to 10th (XI), applicable for the ejecta at t ∼ a few hours after the merger, when the temperature is T ∼ 105 K. We find that the opacities for the highly ionized lanthanides are exceptionally high, reaching

κ

exp

∼
1000

cm

2

g

−
1

for Eu, due to the highly dense energy levels. Using the new opacity, we perform radiative transfer simulations to show that the early light curves become fainter by a (maximum) factor of four, in comparison to lanthanide-free ejecta at t ∼ 0.1 days. However, the period at which the light curves are affected is relatively brief owing to the rapid time evolution of the opacity in the outermost layer of the ejecta. We predict that for a source at a distance of ∼100 Mpc, UV brightness for lanthanide-rich ejecta shows a drop to ∼21–22 mag at t ∼ 0.1 days and the UV peaks around t ∼ 0.2 days with a magnitude of ∼19 mag. Future detection of such a kilonova by an existing UV satellite like Swift or the upcoming UV satellite ULTRASAT will provide useful constraints on the abundance in the outer ejecta and the corresponding nucleosynthesis conditions in the neutron star mergers.
Implementation of the Polarimetry Focusing Telescope Array Observation Simulator on board the X-Ray Timing and Polarimetry Observatory
Authors: Qi Liqiang , Li Gang , Ge Mingyu , Zhang Juan , Jiang Weichun , Liu Xiaohua , Yang Sheng , Du Yuanyuan , Dong Zefang , Yang Yanji , Liu Xiaojing , Sun Liang , Jiang Jiechen , Yang Jiawei , Chen Tianxiang , Jiao Yang , Dai Boyu , He Huilin , Xu Yupeng , Lu Fangjun
Published: July 2022

An observation simulator is established, on an event-by-event basis, for the Polarimetry Focusing telescope Array (PFA) on board the planned enhanced X-ray Timing and Polarimetry observatory (eXTP). An event generator, based on XIMPOL, is used to sample the parameters of the X-rays reaching the aperture of the telescope. The trajectories and interactions of X-rays through the telescope and the corresponding secondaries are calculated using the optics and detector simulation model built in GEANT4, before being translated into signals in the pixelated readout electronics. It is shown that mirror deformation is required for the optics simulation model, and transportation of ionization electrons is required for the detector simulation model to reproduce the overall performance of the telescope. The developed tool is useful in different mission phases, such as payload optimization in the design phase, discrimination of new phenomena against known physics models in the calibration phases, and sensitivity studies of potential polarized X-ray sources in observation planning. The sensitivity of PFA to the Crab Nebula and Crab pulsar is investigated to demonstrate the application of the tool. Even with the dilution effect, space-resolved and phase-resolved polarimetry can reveal important aspects of the Crab Nebula and Crab pulsar and help break the degeneracy between different models.
T-matrix and Hapke Modeling of the Thermal Infrared Spectra of Trojan Asteroids and (944) Hidalgo: Implications for Their Regolith Particle Size and Porosity
Authors: Lowry Vanessa C. , Donaldson Hanna Kerri L. , Ito Gen , Kelley Michael S. P. , Campins Humberto , Lindsay Sean
Published: July 2022

Trojan asteroids (911) Agamemnon, (1172) Aneas, and (624) Hektor and primitive asteroid (944) Hidalgo share a common thermal infrared spectral feature: a prominent 10 μm plateau that is also present in cometary comae spectra. To fit these asteroid spectra, we modeled individual minerals using the light-scattering multiple sphere T-matrix (MSTM) and Hapke reflectance models. Modeled mineral spectra were then combined using a weighted least-squares (WLS) model that included a spectral library of varied particle sizes and porosities. We later refined our method by using the mineral abundances, particle sizes, and porosities computed by WLS as an input to rerun the MSTM and Hapke models. We were able to model the asteroid spectral features using a mixture of olivine components, fine particles, and lunar-like porosities. The Trojan asteroids and (944) Hidalgo are comparable in mineral composition and particle size to spectrally similar bodies such as comet Hale-Bopp and CO3 and CY chondrite meteorites. While the required porosities for modeling are like those present on the lunar surface, they are lower than those in the meteorites and higher than those in comets.
The Dynamical Viability of an Extended Jupiter Ring System
Authors: Kane Stephen R. , Li Zhexing
Published: July 2022

Planetary rings are often speculated as being a relatively common attribute of giant planets, partly based on their prevalence within the solar system. However, their formation and sustainability remain a topic of open discussion, and the most massive planet within our planetary system harbors a very modest ring system. Here, we present the results of an N-body simulation that explores dynamical constraints on the presence of substantial ring material for Jupiter. Our simulations extend from within the rigid satellite Roche limit to 10% of the Jupiter Hill radius, and include outcomes from 106 and 107 yr integrations. The results show possible regions of a sustained dense ring material presence around Jupiter that may comprise the foundation for moon formation. The results largely demonstrate the truncation of stable orbits imposed by the Galilean satellites, and dynamical desiccation of dense ring material within the range ∼3–29 Jupiter radii. We discuss the implications of these results for exoplanets, and the complex relationship between the simultaneous presence of rings and massive moon systems.
Two new species of Calonectria (Hypocreales, Nectriaceae) causing Eucalyptus leaf blight in Brazil
Authors: Sanchez-Gonzalez Enrique I. , Soares Thaissa de Paula Farias , Zarpelon Talyta Galafassi , Zauza Edival Angelo Valverde , Mafia Reginaldo Gonçalves , Ferreira Maria Alves
Published: July 2022

In recent decades, commercial Eucalyptus plantations have expanded toward the warm and humid regions of northern and northeastern Brazil, where Calonectria leaf blight (CLB) has become the primary fungal leaf disease of this crop. CLB can be caused by different Calonectria species, and previous studies have indicated that Calonectria might have high species diversity in Brazil. During a disease survey conducted in three commercial plantations of Eucalyptus in northeastern Brazil, diseased leaves from Eucalyptus trees with typical symptoms of CLB were collected, and Calonectria fungi were isolated. Based on phylogenetic analyses of six gene regions (act, cmdA, his3, rpb2, tef1, and tub2) and morphological characteristics, two new species of Calonectria were identified. Five isolates were named as C. paragominensissp. nov. and four were named as C. imperatasp. nov. The pathogenicity to Eucalyptus of both species was confirmed by fulfilling the Koch’s postulates.
L'évaluation dans le secteur social et médico-social
Authors: Tillard Bernadette , Ribaucourt Magaly , Taverniez Laurence
Published: July 2022

La présente communication rappelle les éléments contextuels qui ont vu l’évaluation interne des établissements et des services s’imposer dans le champ de la protection de l’enfance, puis illustre quelques questions posées par l’évaluation interne à partir de deux situations différentes : la mise en place d’un groupe d’expression de parents dans une Mecs ; la modification des pratiques des éducateurs en AEMO.
L'évaluation dans le secteur social et médico-social
Authors: Sellenet Catherine , Portier-Le Cocq Fabienne
Published: July 2022

Le présent article rend compte d’une recherche internationale effectuée sous l’égide de l’association Bambini, dont le thème était : quel devenir et quelle insertion pour les jeunes ayant été accueillis dans les institutions de la Protection de l’enfance ? L’évaluation internationale exacerbe les problèmes méthodologiques sur quantité de définitions comme par exemple celle de l’insertion, celle de l’autonomie. Chaque pays élabore des définitions qui sont pour partie contextualisées. L’autonomie est différemment pensée, même si un noyau commun existe, en France, Italie, Bulgarie, Roumanie et Lettonie. La première partie de cet article dévoile les problèmes conceptuels d’une telle approche, la seconde partie donne quelques résultats pour la France. Cette recherche a été effectuée par entretiens auprès des professionnels et par le recueil de vingt-cinq témoignages de jeunes âgés de 18 à 23 ans.
A guide for using integration by parts: Pet-LoPo-InPo
Authors: Guo William
Published: July 2022

Based on the tutorial cases accumulated in the past several years, by reclassifying the arithmetic functions (A) in LIATE into the polynomial function (P), the standard power function (Po), and the integer power function (nPo), a new guide, comprising three sub-guides, Pet, LoPo and InPo, or Pet-LoPo-InPo, is summarized in this note to guide practicing integration by parts. This new guide removes many incompatible combinations included in LIATE, rationalizes the relationship between the exponential and trigonometric functions in LIATE, and expands the coverage of the P-functions beyond the traditional definitions. Hence, the new guide can reduce potential confusions that students may experience in using LIATE for their practices of integration by parts. The advantages of this new guide are demonstrated by many worked examples in this note.
Global existence and large time behavior of the quantum Boltzmann equation with small relative entropy
Authors: Wang Yong , Xiao Changguo , Zhang Yinghui
Published: July 2022

In this paper, we study the global well-posedness of the non-relativistic quantum Boltzmann equation with initial data of small relative entropy. For a class of initial data which are allowed to have arbitrary bounded amplitude and even contain vacuum, we establish the global existence and uniqueness of the mild solutions to the quantum Boltzmann equation in the torus \begin{document}$ x\in\mathbb T^3 $\end{document}. The exponential time decay rate is also obtained in the \begin{document}$ L^{\infty}_{x, v} $\end{document}-norm.
Pasquino: riflessioni e acquisizioni dal restauro
Authors: Ciancio Rossetto Paola
Published: July 2022

Il Pasquino, collocato nel 1501 presso il palazzo Orsini a Piazza Navona, divenne la statua parlante più nota della città. Il gruppo è copia di una scul - tura raffigurante un eroe adulto che trasporta il corpo di un giovane morto (Menelao e Patroclo oppure, preferibilmente, Aiace e Achille). Varie le ipo - tesi sul luogo e la datazione della creazione artistica della scultura, ritenuta preferibilmente un’opera elaborata nell’ambito pergameno sia in rapporto al grande donario di Attalo I, sia all’altare (III-II a. C) oppure una produzione rodia di età ellenistica, o infine una realizzazione eclettica romana (fine della repubblica-inizio dell’impero). Il restauro e le analisi svolte hanno chiarito alcuni dati tecnici sull’esecuzione e il tipo del marmo il docimium, utilizzato in età romana per altre grandi sculture. È probabile, per l’eventuale luogo del ritrovamento e per il contesto complessivo topografico-architettonico, che facesse parte della decorazione dello stadio di Domiziano.
Note sulla fortuna iconografica europea del marmo di parione nella prima età moderna
Authors: Lastraioli Chiara
Published: July 2022

La fortuna europea della raffigurazioni del busto di Pasquino sembra dettata non tanto dall’indiscusso pregio artistico del marmo di Parione, quan- to piuttosto dalla funzione letteraria che ad esso venne associata. Se in un primo tempo il travestimento all’antica di Pasquino permise lo svolgimento di un concorso poetico del tutto ufficiale ad uso degli studenti e dei docen- ti dello studium romano, ben presto il marmo di trasformò in una sorta di catalizzatore di testi satirici in cui i grandi della curia e dell’urbe venivano messi alla berlina. Pasquino divenne così, da marmo silente e inanimato, un personaggio letterario dotato di una voce squillante e di uno spirito graffiante che fece molti emuli presso gli autori transalpini, fossero essi cattolici oppure riformati. Il successo della « maschera letteraria » finì con implicare un’ana- loga migrazione del modello iconografico e Pasquino, a seconda dei luoghi, delle epoche e delle strategie polemiche messe in atto, assunse vesti, caratteri e messaggi assai diversi. Il presente studio propone un excursus sulle principali tipologie iconografiche diffusesi nell’Europa continentale dal terzo decennio del Cinquecento in poi.
« Pour dire sa prière » : les statues parlantes en Égypte au Proche-Orient anciens
Authors: Lavergne David
Published: July 2022

Deux catégories de statues sont décrites comme effectivement « parlantes » en Égypte et en Mésopotamie. Ce sont d’abord celles de souverains et de hauts dignitaires déposées dans les sanctuaires et qui possèdent la faculté d’inter - céder verbalement auprès des dieux, pour leur compte ou celui des visiteurs. D’ordinaire invisibles, les statues divines, elles aussi animées par le « Rite de l’ouverture de la bouche », s’expriment surtout par le biais des songes. En raison de sa condition particulière, le pharaon lui-même s’apparente à une statue vivante et douée de parole.
Le statue parlanti (e I tanti modi per zittirle) nell’antichità greca e romana
Authors: Papini Massimiliano
Published: July 2022

L’articolo fornisce una rassegna di casi di statue parlanti (in particolare di natura funeraria) a partire dall’età arcaica : grazie alle iscrizioni produttrici di un durevole kleos, le sculture erano in grado di acquistare la parola. Le immagini potevano poi evocare l’illusione di parlare secondo quegli elogi persistenti da Omero alla tarda antichità – e oltre – che esaltano scultura e pittura per il grado di perfezione mimetica : sembrano sul punto di respirare e anche di parlare le creazioni degli artefici più celebrati per la ricerca della veritas/aletheia. Dopo la menzione di casi celebri di statue parlanti di diversi luoghi e tempi, come quelli di Memnon a Tebe in Egitto e di due divinità in epoca repubblicana (Fortuna Muliebris al momento della sua consacrazione nel tempio sulla via Latina e Giunone a Veio in occasione della conquista della città da parte di M. Furio Camillo), il contributo riserva la parte finale anche a differenti esempi di offesa e distruzione di sculture da due poli temporali opposti, il VI-V sec. a.C. e l’età tardo-antica.
Les epigrammes d’Ausone ou quand un poète fait parler les statues…
Authors: Michel d’Annoville Caroline
Published: July 2022

Il s’agit de s’interroger sur des épigrammes portant sur des statues com - posées durant la seconde moitié du IVe siècle par Ausone. Une vingtaine de ces textes sont le commentaire artistique rapide de ces images selon un mode poétique assez classique, mais qui à l’époque d’Ausone ont une résonance particulière. Ils témoignent d’une véritable réflexion esthétique qui se nourrit ou vient enrichir une approche critique de ces objets, notamment des représentations de divinités païennes, jugées alors dangereusement équivoques en raison de leur aspect « mimétique ». L’effet est délibérément renforcé par la forme donnée à ces textes puisque la statue semble parler d’elle-même. Ces courts poèmes d’Ausone, à la différence des discours virulents des polémistes chrétiens ou d’autres, sont pétillants, jouant sur les effets provoqués par l’imitation de la réalité dans la pierre ou le bronze, tour à tour amusé, effrayé ou fasciné par la duperie née de la prouesse technique. Ces épigrammes m’ont paru être plus qu’un jeu littéraire, elles permettent d’appréhender la réception d’un type d’image à la fin de l’Antiquité et d’étudier le regard singulier qu’un auteur fameux de l’Antiquité tardive porte sur sa culture
Evaluating Interior Architectural Elements That Influence Perception of Spaciousness in Isolated, Confined, and Extreme Environments
Authors: Diker Berk , Demirkan Halime
Published: July 2022

This research aims to understand the factors that contribute to the quality of life within isolated, confined, extreme (ICE) environments by investigating the architectural elements that affect an individual’s spatial perception, their manifestation in ICE environments, and how spatial confinement and isolation contribute to changes in an individual’s perception of spaciousness. The researchers performed an in-depth examination on three different habitats, designed to simulate life in ICE environments, to identify which architectural elements were important contributors to positive and negative changes in spaciousness. For further explorations, fourteen design professionals were asked to evaluate these habitats using the Spaciousness and Crampedness Scale (SCS) and measuring the relative estimation in error of habitats’ areas. Afterward, the evaluations were compared with the examinations. The results indicate that the environment’s geometry, lighting, color, and texture significantly contribute to perceived spaciousness when evaluated through qualitative and quantitative methods.
Critical Analysis of Educational Aspirations and Practices Inside a Low-Cost Rural Private School
Authors: Dar Wahid Ahmad
Published: July 2022

Not much has been written on the issue of evolution of schooling in hard to reach places in south Asia. This article offers a critical overview of the underlying mechanism by which Low Cost Private School operate within rural Indian Milieu. It argues that these schools may have little to offer to disadvantaged students, beyond loads of information and good examination performances. In order to substantiate its argument, it systematically highlights the complexities and contradictions of examination focused educational practices prevalent in such schools. These findings are very important in terms of viewing such practices in relation to vision of quality education in SGD-4, which emphasises learning by interactive and inclusive engagement of students.
Research and Analysis of Influence Maximization Techniques in Online Network Communities Based on Social Big Data
Authors: Hou Jun , Chen Shiyu , Long Huaqiu , Li Qianmu
Published: July 2022

Recent years, many online network communities, such as Facebook, Twitter, Tik Tok, Weibo, etc., have developed rapidly and become the bridge connecting physical social world and virtual cyberspace. Online network communities store a large number of social relationships and interactions between users. How to analyze diffusion of influence from these massive social data has become a research hotspot in the applications of big data mining in online network communities. A core issue in the study of influence diffusion is influence maximization. Influence maximization refers to selecting a few nodes in a social network as seeds, so as to maximize influence spread of seed nodes under a specific diffusion model. Focusing on two core aspects of influence maximization, i.e., models and algorithms, this paper summarizes the main achievements of research on influence maximization in the computer field in recent years. Finally, this paper briefly discusses issues, challenges and future research directions in the research and application of influence maximization.
Optical Dielectric Constant and Electronegativity Difference in ANB8-N Type Binary Compounds
Authors: Aniya Masaru , Noda Hiroyuki
Published: July 2022

An empirical relation that correlates the optical dielectric constant and the electronegativity difference in ANB8-N type binary compounds is presented. The relation uses only one numerical constant common to all I-VII, II-VI and III-V compounds. The simplicity of the relation provides a clue to understand the role of the charge transfer from one atom to another in the origin of the optical dielectric constant. It is also shown that the optical dielectric constant correlates better with the Pauling ionicity scale than with the Phillips ionicity scale. The possible physical background of the found relation is discussed based on the results obtained.
Modification of Coal Fly Ash with Dithizone for Adsorption of Ni(II) Metal Ion
Authors: Rohmah Dini Novi , Aprilita Nurul Hidayat , Mudasir Mudasir
Published: July 2022

Adsorption of Ni(II) ion onto adsorbent of dithizone-immobilized coal fly ash (IFA) has been investigated in batch experiments. The activated coal fly ash (AFA) and its dithizone modification were characterized by FT-IR and XRD. Several parameters influencing the adsorption of Ni (II) ions on both adsorbents including effect of pH, adsorbent dosage, contact time and initial concentration on the efficiency of the adsorption of Ni (II) ion were investigated. The optimum condition of Ni(II) adsorption was found at pH 4, adsorbent dosage of 0.02 g, contact time of 60 min and initial Ni (II) ion concentration of 80 mg L–1. The adsorption kinetics of Ni(II) ions on AFA is best described by a pseudo first-order kinetic model while that on IFA follows a pseudo-second-order kinetic model. The adsorption isotherm of Ni(II) on both adsorbents follows the Langmuir model. Kinetics and adsorption isotherm studies suggest that the capacity and affinity of the IFA in adsorbing Ni(II) ions are significantly improved compared to those of AFA, suggesting the role of dithizone in the adsorption of Ni (II) by forming chelate complexation as proved by the results of sequential desorption.
Improving the Quenching of the Undercarriage Space due to the Adhesive Properties of Gel-Forming Compositions
Authors: Ostapov Kostiantyn , Senchykhin Yurii , Ragimov Sergey , Kirichenko Igor
Published: July 2022

The issue of increasing the technological and technical capabilities of firefighting undercarriage space at subway stations due to more efficient, due to adhesion to the burning surfaces of gel-forming compositions is considered. It is proposed to use a special cart to deliver the gel-forming system Na2O·2,95SiO2 – CaCl2 to hard-to-reach locations of electromechanical and other equipment of electric trains. The analysis of these experiments is carried out by comparing the time and mass of spent gel-forming compositions, water, fire-extinguishing powder when extinguishing model hearths close to the real undercarriage space. It is determined that due to the adhesion of the gel to the surface of the combustible substance, it is possible to reduce the loss of extinguishing agent in comparison with water or extinguishing powder.
Li-Doped SnO2 Electron Transport Layer for High-Performance Perovskite Solar Cell Fabricated Using Magnetic Field-Assisted Electrodeposition
Authors: Aji Demas , Pakawatpanurut Pasit
Published: July 2022

One of the key challenges for the development of perovskite solar cells lies in the approach toward large-scale fabrication of the active materials that allows for good photovoltaic performance, as well as facile handling. The electrodeposition technique can potentially address such requirements. However, the technique has yet to be investigated in detail and still suffers from low efficiency of the device. In this study, we sought to significantly upgrade the electrodeposition approach by coupling the technique with an external magnetic field in the preparation of high-quality PbI2 precursor layer and using Li-doped SnO2 electron transport layer. Our results showed that the magnetic field-assisted electrodeposition yielded good crystallinity of PbI2 and perovskite. Introducing the Li-doped mesoporous SnO2 into the device structure resulted in a higher current density of 18.50–18.80 mA cm-2, which can be attributed to, based on the linear sweep voltammetry, reduced resistance of the electron transport layer from 32.27 to 22.11 Ω cm-2. Moreover, the carbon-based device prepared using this simple procedure also yielded 5.20% in photoconversion efficiency for 1-cm2 active area and 0.45% for 25-cm2 active area, all without any significant hysteresis.
Application of Intumescent Coating for Increasing Fire-Resistance Values of Cable Products
Authors: Likhnyovskyi Ruslan , Tsapko Oleksii , Kovalenko Vitalii , Onyshchuk Andrii
Published: July 2022

The results of experimental studies on the effectiveness of insulation of electrical cables with fire-resistant coating are presented. Analysis of methods of cables products using shows a steady trend of increasing their using during the arrangement of premises. Fires and rapid spread of flame are possible during the exploitation of such structures. Statistics of cable products show a low level of safety due to using of combustible insulation, which is highly sensitive to high temperatures and fire. After the test, it is seen that the specimen of the cable without a fire-resistant coating supports self-combustion for more than 30 s, and the damage to the specimen is more than 100 mm. After testing the specimen with a fire-resistant coating, it is seen that the cable specimen doesn’t support self-combustion, and the damage to the specimen isn’t more than 40 mm. Inhibition of the process of ignition and propagation of flame for such specimen is associated with the decomposition of flame retardants under the action of temperature, which occurs with heat absorption and release of non-combustible gases (nitrogen, carbon dioxide), as well as changing the direction of decomposition towards non-combustible gases and flame retardant coke residue. This leads to an increase of the thickness of the coke layer and inhibition of heat transfer of high-temperature flame to the insulation material, which indicates the possibility of transition of combustible insulation of the cable with a fire-resistant coating to non-flammable materials, which aren’t spread a flame.
Effect of Ball Milling Technology on Properties of Refractory Waste
Authors: Liu Yue , Song Jie Guang , Zhu W.L. , Zhang Dong Liang , Wen H.B. , Huang Rong
Published: July 2022

With the popularization of "sponge city" in the whole country, the use of permeable bricks is increasing every year. Although the raw materials required for the preparation of permeable bricks are widely sourced, there are few reports on the process of using refractory waste to prepare permeable bricks. It is the ball milling process of refractory waste. The effects of ball milling time, ball mill rotation speed, and ball-to-material ratio on the properties of refractory waste were mainly studied. Through the experimental results and analysis, the following conclusions can be drawn: with the increase of ball milling time, ball milling speed and ball-to-material ratio, the particle size of refractory waste powder gradually decreases. Through research, it is concluded that the optimal ball milling time is 4h, the ball milling speed is 100r/min, and the ball-to-material ratio is 2:1.
Study on Flow Stress Model of AA5005 Material
Authors: Li Si Jia , Chen Wen Ning , Krishna Singh Bhandari , Kosimov Nodirbek , Jung Dong Won
Published: July 2022

Due to the continuous emergence of new alloys and the improvement of basic research requirements for aluminum alloy, researchers need to further study the flow constitutive relationship of new aluminum alloys. This paper used Model MTS-810 tensile machine to conduct tensile tests on AA5005 aluminum alloy at temperature of 360°C and strain rate of . Hollomon model, Swift model, Voce model, Voce+Voce model were used to compare the fitting accuracy with the experimental stress-strain curves, and the fitting parameters required by each formula were obtained from the fitting results, so as to obtain the constitutive model of AA5005 aluminum alloy. The Voce+Voce model which with more fitting freedom degree, lower flow stress increasing rate and saturation rate is most suitable to describe flow stress relation of aluminum alloy AA5005.
Electromagnetically Induced Transparency and Fano Resonances Base on Coaxial Photonic Waveguide Made up of Asymmetric Loop and Resonators
Authors: El-Aouni Mimoun , Ben-Ali Youssef , El Kadmiri Ilyass , Bria Driss
Published: July 2022

In the actual work, we present the phenomenon of electromagnetically induced transparency (EIT) and Fano resonances by one-dimensional microwave coaxial waveguides for the aim to achieve a filtering system either by transmission or by reflection with very high performance. Our proposed system is composed of coupled asymmetric loops of lengths d2 and d3, and two asymmetric resonators of lengths d5 and d6. This system creates the resonance modes, which are sensitive to certain lengths, while they are insensitive to other lengths. The very narrow EIT resonance appears as a maximum transmission peak stuck between two transmissions zeros, this EIT is due to the interaction of the Eigen modes of symmetric resonators and the incident electromagnetic waves. On the other hand, a resonance near to a zero of transmission is called a Fano resonance, its appearance is due to the interaction between the Eigen modes of symmetric loops and the incoming electromagnetic waves. The theoretical results are obtained using the continuous medium interface response theory, which allows calculating the Green function of composite systems and the transmission rate T. This structure can be utilized for electromagnetic filtering by transmission or reflection with high transmittance and good quality factor. According to these results, this filtering system can be used in the field of microwave communication antennas.
Synthesis of Polymer-Derived Carbon for Ibuprofen Removal from Simulated Wastewater
Authors: Mutia Aulia Septiani , Prasetyo Imam , Ariyanto Teguh
Published: July 2022

Ibuprofen is a nonsteroidal anti-inflammatory drug classified as one of the emerging contaminants from the pharmaceuticals group. Ibuprofen detected in the environment indicates that wastewater treatment facilities have a limited ability to remove this substance. Residual ibuprofen that accumulates continuously can harm ecosystems in the waters and indirectly affect human health. Adsorption using porous material is a method that can reduce the amount of ibuprofen in wastewater. This research synthesized porous carbon by pyrolysis of phenolic polymer. The resulting material was then characterized using an N2-sorption analyzer, SEM, and XRD. After being characterized, the material was used to adsorb ibuprofen at various concentrations. SEM characterization showed that carbon had voids or channels for adsorbing ibuprofen molecules. N2-sorption analyzer delivered that the polymer-derived carbon has a specific surface area of about ​​594 m2 g-1. Based on the adsorption test result, the porous carbon could adsorb the ibuprofen molecules in the simulated wastewater well and followed the Freundlich equilibrium model.
Mathematical Modeling of the Protective Effect of Ethyl Silicate Gel Coating on Textile Materials under Conditions of Constant or Dynamic Thermal Exposure
Authors: Sharshanov Andrey , Tarakhno Olena , Babayev Atabala M. , Skorodumova Olga
Published: July 2022

The influence of the process of fire-retardant coating on textiles on the degree of fire protection of cotton and blended fabrics is investigated. Physical-chemical properties of impregnated samples of textile materials depending on the composition of ethyl silicate hydrolysates, concentration and content of diammonium hydrogen phosphate on fire resistance of impregnated samples, time of onset destruction and area of charring of samples after fire tests are analyzed. The obtained experimental data showed the need to build a mathematical model of the protective action of the gel coating based on the laws of heat and mass transfer, which under conditions of maximum simplicity and minimal artificiality takes into account the main processes from the external heat flow processes of heat transfer, thermal decomposition, evaporation and removal of mass, as well as to develop algorithms and software for computer modeling of the protective action of such a coating in conditions of constant or dynamic thermal exposure. A mathematical model of fire-retardant action of organosilicon coating on cellulose-containing fiber of fabric threads has been developed. It provides predictive estimates of fire safety parameters of textile materials, based on the level of thermal impact on the surface of the protected material.
Bulk Modules of Three-Phase Composites with Spherical Inclusions
Authors: Erofeev V.T. , Tyuryakhina T.P. , Tingaev Aleksandr V. , Gladkin S.S.
Published: July 2022

In order to theoretically estimate the bulk modulus of granular composite materials (concretes: consisting of a binder and fine and coarse aggregates), the proposed model of the representative unit cell of a 3-phase concrete (with spherical gravel inclusion) is replaced by two 2-phase models: sand mortar (binder + sand) and concrete (mortar + gravel). The research paper substantiates the transition from the use of the Voigt – Reuss "fork" formulas (two models of 2-phase composites) to the generalized Voigt – Reuss "fork" formulas in cell models of 3-phase composites. A numerical and graphical analysis of the generalized formulas is made using the example of one of the possible subsets of 3-phase concretes. The graphic images of the Voigt – Reuss "forks" (of the analyzed subset of 3-phase composites) are characterized by their greater diversity in comparison with traditional images (in 2-phase composites). In this work, to choose out from the multitudes of possible compositions (3-phase composite) of the studied subset of 2-phase composites the authors employ and recommend for practical use the multistep dichotomy method.
Flexible Temperature Sensor Based on Binary Polymer Composite Thin Film
Authors: Aziz Shahid , Bhandari Krishna Singh , Jung Dong Won
Published: July 2022

A high performance flexible temperature sensor for environmental and health monitoring has been fabricated using various combinations of composite blend of poly vinylidene fluoride / poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate) (PVDF/PEDOT:PSS). The response curves and working principle were investigated and sensors were then fabricated to achieve highly linear and stable response for a wide range of temperature sensing (25°C to 120°C). The film was fabricated on flexible polyethylene terephthalate (PET) substrate using spin coating. The copper electrodes were fabricated using copper tape. The sensors showed stable and close to linear response of impedance change by varying temperature in the range 25°C to 120°C. The resistance of the sensors changed from ~70MΩ to ~52MΩ for the temperature change in the range 25°C to 120°C. The sensors are aimed to replace low performance, complex and expensive sensors in the market for environmental and health monitoring applications.
Effect of Staged Methane Flow on Graphene Quality of Low-Pressure Chemical Vapor Deposition
Authors: Lim Taeuk , Cheng Hao , Wang Shu Le , Hu Jie , Jung Won Suk
Published: July 2022

The chemical vapor deposition method and the method using copper are suitable for high-quality large-area graphene synthesis. Here, we present methane flow conditions for obtaining high-quality graphene over a large area. The conditions of gases other than the flow rate of methane were fixed, and the graphene synthesized by adjusting the flow rate of methane and the exposure time of methane was verified through the Raman spectrum. When the methane flow rate was 5 sccm, the growth of graphene was island-shaped and made into a multilayer graphene. When the methane flow rate increases to 8 sccm, the Irish growth of graphene disappears and stably grows into a single layer. However, if the flow rate exceeds 9 sccm, Irish growth disappears. However, in order to minimize the area where graphene in the multilayer is synthesized, the methane exposure time was analyzed in units of 10 minutes from 5 minutes to 25 minutes. When analyzing the I[2d]/I[g] value and I[d]/I[g] value of the Raman spectrum, single-layer graphene of a large area could be observed.
Preparation of Novel Copper Iron Lazulite Imitated Phosphate Pigments
Authors: Onoda Hiroaki , Sasaki Ryota
Published: July 2022

In recent years, the use of hazardous heavy metals has been banned all over the world, and the development of alternative materials is required. As for inorganic pigments, heavy metals have been used so far, but there is an urgent need for development of inorganic pigments that do not use these. In this work, novel phosphate pigments imitated natural ore were prepared from copper, iron, aluminum nitrate solutions, ascorbic acid, and phosphoric acid at pH 5. The obtained precipitates were heated at 300 and 500oC for 1 hour. The precipitates and their thermal products were estimated with X-ray diffraction (XRD), Infrared (IR) spectra, ultraviolet–visible (UV–Vis.) reflectance spectra, and L*a*b* color space. By adjusting the Cu/Fe ratio and temperature, inorganic phosphate pigments of light blue, green, yellow, orange, brown and red could be obtained.
Identification of Toxic Heavy Metals and Trace Elements in Pesticides Used by Shallots (Allium Cepa Var. Aggregatum) Farmers in Brebes District, Indonesia
Authors: Murniasih Sri , Santosa Sri Juari , Roto Roto
Published: July 2022

This study aims to identify the toxic heavy metals and trace elements in pesticides which are suspected to be a source of environmental pollution. The Neutron Activation Analysis method was used to identify and determine the concentration of toxic heavy metals and trace elements in pesticide samples. The pesticides used in this study consist of pesticides that are widely used by onion farmers in Brebes District, Central Java – Indonesia. These pesticides consist of two types (fungicides and insecticides) and in two different forms (solid and liquid). The results indicates that pesticides contain large levels of trace elements (Mg, Ti, Cl, Al, Ca, Br, Na, U, Mn, Br, La, Se, Hg, Rb, Fe, Eu, and Sb), and toxic heavy metals (As, Co, Cr, Ni, Zn, Cu, Hg). Generally, solid pesticides contain higher concentration of elements than liquid pesticides. In addition to releasing organic compounds, pesticides are also proven to be a source of certain trace elements (especially Mn, Br, Ti, Fe, Al) and toxic heavy metals (Cu, Zn, and Cr). They can affect the presence of these elements in the environment. *Corresponding author: sjuari@ugm.ac.id
Enhanced Reliability Method for the Two-Way Shear Provisions of the European Code for Lightweight Concrete
Authors: Alkhatib Soliman , Deifalla A.
Published: July 2022

The two-way shear failure of concrete elements is sudden; thus, reliable design codes are a must. In this current study, three reliability methods were implemented, namely: the Mean Value First Order Second Moment (MVFOSM), the First-Order Second Moment Method (FOSM), and the Rackwitez-Fiessler procedure (RFHL-FOSM) on the two-way shear provisions of the European design code for lightweight concrete. A brief state-of-the-art review of existing reliability methods is presented and compared. An extensive experimental database of lightweight concrete slabs testing under two-way shear loading was gathered. The reliability index was calculated for the design code. This index was compared with the target values set by international standards. For two-way shear of lightweight concrete, the European design code was found to achieve the target of reliability. The MVFOSM was found to provide a better reliability index than using the FOSM.