bluuebunny/crossref_metadata_2025 huggingface dataset:
Global and Northern-High-Latitude Terrestrial carbon sinks in the 21st century from CMIP6 experiments
Authors: Qiu Han , Hao Dalei , Zeng Yelu , Zhang Xuesong , Chen Min
Published: June 2022

Abstract. Climate warming is accelerating the changes in the global terrestrial ecosystems and particularly those in the northern high latitudes (NHL), and rendering the land-atmosphere carbon exchange highly uncertain. The Coupled Model Intercomparison Project Phase 6 (CMIP6) employs the most updated climate models to estimate terrestrial ecosystem carbon dynamics driven by a new set of socioeconomic and climate change pathways. By analyzing the future (2015–2100) carbon fluxes estimated by ten CMIP6 models, we quantitatively evaluated the projected magnitudes, trends and uncertainties of global and NHL carbon fluxes under four scenarios plus the role of NHL in the global terrestrial ecosystem carbon dynamics. Overall, the models suggest that the global and NHL terrestrial ecosystems will be consistent carbon sinks in the future, and the extent of the carbon sinks is projected to be larger under scenarios with higher radiative forcing. By the end of this century, the models by average estimate the NHL net ecosystem productivity (NEP) as 0.54±0.77, 1.01±0 .98, 0.97±1.62, and 1.05±1.83 PgC/yr under SSP126, SSP245, SSP370 and SSP585, respectively. The uncertainties are not substantially reduced compared with earlier results, e.g., the Coupled Climate Carbon Cycle Model Intercomparison Project (C4MIP). Although NHL contributes a small fraction of the global carbon sink (~13 %), the relative uncertainties of NHL NEP are much larger than the global level. Our results provide insights into future carbon flux evolutions under future scenarios and highlight the urgent need to constrain the large uncertainties associated with model projections for making better climate mitigation strategies.
Technical note: Accelerator mass spectrometry of 10Be and 26Al at low nuclide concentrations
Authors: Wilcken Klaus M. , Codilean Alexandru T. , Fülöp Réka-H. , Kotevski Steven , Rood Anna H. , Rood Dylan H. , Seal Alexander J. , Simon Krista
Published: June 2022

Abstract. Accelerator mass spectrometry (AMS) is currently the standard technique to measure cosmogenic 10Be and 26Al concentrations, but the challenge with measuring low nuclide concentrations is to combine high AMS measurement efficiency with low backgrounds. The current standard measurement setup at ANSTO uses the 3+ charge state with Ar stripper gas at 6 MV for Be and 4 MV for Al, achieving ion transmission through the accelerator for 10Be3+ and 26Al3+ of around 35 % and 40 %, respectively. Traditionally, 26Al measurement uncertainties are larger than those for 10Be. Here, however, we show that 26Al can be measured to similar precision as 10Be even for samples with 26Al / 27Al ratios in the range of 10−15, provided that measurement times are sufficiently long. For example, we can achieve uncertainties of 5 % for 26Al / 27Al ratios around 1×10-14, typical for samples of late Holocene age or samples with long burial histories. We also provide empirical functions between the isotope ratio and achievable measurement precision, which allow predictive capabilities for future projects and serve as a benchmark for inter-laboratory comparisons. For the smallest signals, not only is understanding the source of 10Be or 26Al background events required to select the most appropriate blank correction method but also the impact of the data reduction algorithms on the obtained nuclide concentration becomes pronounced. Here we discuss approaches to background correction and recommend quality assurance practices that guide the most appropriate background correction method. Our sensitivity analysis demonstrates a 30 % difference between different background correction methods for samples with 26Al / 27Al ratios below 10−14. Finally, we show that when the measured signal is small and the number of rare isotope counts is also low, differing 26Al or 10Be concentrations may be obtained from the same data if alternate data reduction algorithms are used. Differences in the resulting isotope concentration can be 50 % or more if only very few (≲ 10) counts were recorded or about 30 % if single measurement is shorter than 10 min. Our study presents a comprehensive method for analysis of cosmogenic 10Be and 26Al samples down to isotope concentrations of a few thousand atoms per gram of sample, which opens the door to new and more varied applications of cosmogenic nuclide analysis.
A Local Data Assimilation Method (Local DA v1.0) and its Application in a Simulated Typhoon Case
Authors: Wang Shizhang , Qiao Xiaoshi
Published: June 2022

Abstract. A local data assimilation method, Local DA, is introduced. The proposed algorithm aims to perform hybrid and multiscale analyses simultaneously yet independently for each grid, vertical column or column group and aims to flexibly perform analyses with or without ensemble perturbations. To achieve these goals, an error sample matrix is constructed by explicitly computing the localized background error correlation matrix of model variables that are projected onto observation-associated grids (e.g., radar velocity) or columns (e.g., precipitable water vapor). This error sample matrix allows Local DA to apply the conjugate gradient (CG) method to solve the cost function and to perform localization in the model-variable space, the observation-variable space, or both spaces (double-space localization). To assess the Local DA performance, a typhoon case is simulated, and a multiscale observation network comprising sounding, wind profiler, precipitable water vapor, and radar data is built; additionally, a time-lagged ensemble is employed. The results show that experiments using the hybrid covariance and double-space localization yield smaller analysis errors than experiments without the static covariance and experiments without double-space localization. Moreover, the hybrid covariance plays a more important role than does localization when a poor time-lagged ensemble is used. The results further indicate that applying the CG method for each local analysis does not result in a discontinuity issue, and the wall clock time of Local DA implemented in parallel is halved as the number of cores doubles.
Climate Impacts of Parameterizing Subgrid Variation and Partitioning of Land Surface Heat Fluxes to the Atmosphere with the NCAR CESM1.2
Authors: Yin Ming , Wang Yong , Sun Wenqi , Deng Jianbo , Wei Daoming , Kong Ying , Wang Bin
Published: June 2022

Abstract. All current global climate models (GCMs) only utilize grid-averaged surface heat fluxes to drive the atmosphere, and thus, their subgrid horizontal variations and partitioning are absent. This can result in many simulation biases. To address this shortcoming, a novel parameterization scheme considering the subgrid variations of the sensible and latent heat fluxes to the atmosphere and the associated partitioning is developed and implemented into the National Center for Atmospheric Research (NCAR) Climate Earth System Model 1.2 (CESM1.2). The evaluations show that in addition to the improved boreal summer precipitation simulation over eastern China and the coastal areas of the Bay of Bengal, the longstanding overestimations of precipitation on the southern and eastern margins of the Tibetan Plateau (TP) in most GCMs are significantly mitigated. The improved precipitation simulation on the southern and eastern margins of the TP is from suppressed large-scale precipitation. Moisture advection for precipitation production is blocked toward the southern edge of the TP, and the intensity of the moisture transport to the eastern edge is weakened. The corrected large-scale circulation in the lower atmosphere due to the realistic simulations of the grid-scale surface radiative and heat fluxes is responsible for the change in moisture transport. In terms of global annual mean states, some improvements are obtained by the new scheme compared to the default CESM1.2 and the scheme stochastically allocating the subgrid surface heat fluxes to the atmosphere (i.e., without subgrid partitioning included). This study highlights the importance of subgrid surface energy variations and partitioning to the atmosphere in the simulation of the hydrological and energy cycles in GCMs.
Impact of atmospheric forcing uncertainties on Arctic and Antarctic sea ice simulation in CMIP6 OMIP
Authors: Lin Xia , Massonnet François , Fichefet Thierry , Vancoppenolle Martin
Published: June 2022

Abstract. Atmospheric reanalyses are valuable datasets to drive ocean-sea ice general circulation model and to propose multi-decadal reconstructions of the ocean-sea ice system in polar regions. However, these reanalyses exhibit biases in these regions. It was previously found that the representation of Arctic and Antarctic sea ice in models participating in the Ocean Model Intercomparison Project Phase 2 (OMIP2, using the Japanese 55-year atmospheric reanalysis) was significantly more realistic than in the OMIP1 (forced by atmospheric state from the Coordinated Ocean-ice Reference Experiments version 2, CORE-II). To understand why, we study the sea ice concentration budget and its relations to surface heat and momentum fluxes, as well as the connections between the simulated ice drift and the ice concentration, the ice thickness and the wind stress in a subset of three models (CMCC-CM2-SR5, MRI-ESM2-0, and NorESM2-LM). These three models are representative of the ensemble and are the only ones to provide the tendencies of ice concentration attributed to dynamic and thermodynamic processes required for the ice concentration budget analysis. It is found that negative summer biases in high-ice concentration regions and positive biases in the Canadian Arctic Archipelago (CAA) and central Weddell Sea (CWS) regions are reduced from OMIP1 to OMIP2 due to surface heat fluxes changes. Net shortwave radiation fluxes provide key improvements in the Arctic interior, CAA and CWS regions. There is also an influence of improved surface wind stress in OMIP2 giving better winter Antarctic ice concentration and the Arctic drift speed simulations near the ice edge. The ice velocity direction simulation in the Beaufort Gyre and the Pacific and Atlantic sectors of the Southern Ocean in OMIP2 are also improved owing to surface wind stress changes. This study provides clues on how improved atmospheric reanalysis products influence sea ice simulations. Our findings suggest that attention should be paid to the radiation fluxes and winds in atmospheric reanalyses in polar regions.
HDPE Recycled Plastic Composite with Cellulose Fiber Filler Based on Oil Palm Empty Fruit Bunches
Authors: Atmaja Wawan , Zulnazri Zulnazri , Muarif Agam , W Willy
Published: June 2022

Composite is an advanced material product that has better mechanical properties than a single material and has high tensile strength; it can be applied to the construction of boat walls, car dashboards, electronic casings, and others. This study examines the composite quality of HDPE recycled plastic using cellulose fiber-based on Empty Palm Oil Bunches (TKKS), which is processed through an extruder and injection melt blending system. The method used is mixing plastic and fiber materials with a roll mill and blending with an extruder. Cellulose fiber was dissolved with compatibilizer maleic anhydrous (MAH) 2.5% as much as 20 mL, stirred until smooth, and HDPE plastic was dissolved with benzoyl peroxide (BPO) 0.5% 10 mL. The composite was molded with hot pores at 160-170 ᴼC. The tensile test shows the strength of HDPE composite (90: 10) is 27.0 Mpa with maximum load reaching 274 N, HDPE composite (80: 20) is 26.0 MPa with full load 258 N, HDPE composite (70: 30) is 320.0 MPa with a maximum load of 316 N. SEM shows the surface structure of the fiber-compatible HDPE composite. Functional group analysis showed that HDPE composites had O-H and C-O-C functional groups derived from lignocellulosic OPEFB material. The appearance of these two peaks indicates a compatible interaction between the HDPE matrix and cellulose. DSC shows that HDPE composites have a degradation temperature of up to 260 ᴼC and a decomposition temperature of 493.45 ᴼC. This temperature indicates that the HDPE-cellulose composite can withstand heat until it decomposes at a temperature of 493 45 oC.
Doping Effect and Microstructure Behavior of Rare-Earth Element Cerium (Ce+3) in Barium Hexaferrite (BaCexFe12-xO19) Nanoparticles
Authors: Gilani Zaheer Abbas , Ahmed Awais , Khan Asghar H M Noor ul Huda , Muhammad Khalid
Published: June 2022

Cerium substituted BaM hexaferrites BaCexFe12-xO19 (x = 0.0, 0.25, 0.5, 0.75, and 1.0) nano crystallites were synthesized via Sol-gel method. The x-ray diffraction (XRD) patterns were analyzed by Rietveld refinement which confirms the formation of hexagonal structure. The crystalline size was calculated by Debye Scherrer method, W–H method and SSP method. The lattice constant ? found to decrease, this was due to the octahedral site replacing a large radius of Ce3+ ion with a smaller radius Fe3+ ion, While the lattice constant c found increase. The x-ray density observed increases with increasing Ce3+ concentration. Fourier transform infrared spectroscopy (FTIR) confirmed the two frequency bands n1 tetrahedral site and n2 octahedral site in a range between 400–620 cm-1. Impedance analyzer was used to investigate the dielectric properties in a range of 1 MHz – 3 GHz following Maxwell Wagner model. Dielectric constant showed decreasing trend while dielectric loss showed dispersive behavior by increasing frequency and same was that with tangent loss, such behavior was due to Koop's phenomenological theory. AC conductivity exhibits a plane behavior in a low frequency, while dispersive in high frequency. Such behavior was due to grain effect at high frequency. Impedance showed continuous action at high frequency, which is attributed to the release of space charges. The real and imaginary modulus showed variation by increasing frequency, which was due to the occurrence of relaxation phenomenon. As per dielectric research, these ferrites can be utilized in high frequency devices, microwave technologies, and semiconductor devices.
Comparison of Thermoelectric Properties of ZnO and ZnSnO Thin Films Grown on Si Substrate by Thermal Evaporation
Authors: Rehman U. , Mahmood K. , Ali A. , Ikram S.
Published: June 2022

In this manuscript, we compared the thermoelectric properties of ZnO and ZnSnO thin films grown on silicon (100) substrate. We have evaporated Zn and Sn+Zn metal powders were evaporated in vacuum tube furnace alternatively, under same experimental conditions for the growth of ZnO and ZTO respectively. After the deposition, these grown films were cut into pieces and post growth annealed at different annealing temperatures from 600oC to 800oC in the air using programmable muffle furnace. Seebeck and Hall data suggested that ZTO sample shows highest value of Seebeck coefficient, electrical conductivity and power factor as compared to the ZnO samples. It is also observed that the value of Seebeck coefficient showing an increasing trend for both of the samples as we increase the post growth annealing temperature. The higher thermoelectric properties for ZTO are due the presence of Sn atoms in ZnO structure. Tin dopants may generate secondary phases and/or enhanced the carrier mobility which might be the reason that ZTO has improved thermo-electric properties as compared to ZnO. XRD and Raman measurements were used to confirm the formation of ZTO. XRD data verified the hexagonal structure of ZnO but a slight red shift is observed for the case of ZTO samples. To further justify our argument, we have also performed Raman spectroscopy measurements which confirmed the presence of Sn elements in ZTO.
Magnesium Ferrite/Polyvinyl Alcohol (PVA) Nanocomposites: Fabrication and Characterization
Authors: Nasar Gulfam , Muhammad Ishfaq  , Ahmad Fawad , Nazir Shahbaz , Ur Raheem Faseeh
Published: June 2022

Terbium doped magnesium spinel ferrites (Mg1-xTbxFe2O4) with composition x=0.12, 0.14, 0.16, 0.18 were synthesized via micro-emulsion method followed by synthesis of PVA/Mg1-xTbxFe2O4 composites using in-situ polymerization technique. The structural properties were evaluated using X-ray diffraction (XRD) and Fourier transform infra-red spectroscopy (FTIR). XRD analysis confirmed the construction of spinel lattice of terbium ferrite whereas FTIR revealed the interactions between ferrite nanoparticles and polyvinyl alcohol matrix. The XRD and FTIR results quite matched with the reported literature. The dielectric and resistivity analyses were performed by determining dielectric parameters and current-voltage measurements. The values of dielectric constant, dielectric loss and tan ? were found to be inversely proportional to the frequency under the ambient electric field at room temperature but became constant at higher frequency values. The lower values of dielectric constant of terbium incorporated magnesium ferrite polymer composites (MgFe2O4/PVA) are attributed to hindrance in ‘electron exchange mechanism’ created by lockup between iron and terbium ions. The resistivity values of all the composites were found from 2.5x109 ?cm to 18.8x109 ?cm which showed a non- linear behavior.
Synthesis and Characterization of Praseodymium Doped Nickel Zinc Ferrites using Microemulsion Method
Authors: Khan Asghar H. M. Noor ul Huda , Nawaz Muhammad Kamran , Hussain Rafaqat , Gilani Zaheer Abbas
Published: June 2022

Spinel ferrites nanoparticles are plays important role in our daily life. Praseodymium doped Nickel Zinc Ferrite Nanoparticles having general formula Ni0.3Zn0.7PrxFe2-xO4 (x=0.00, 0.025, 0.050, 0.075 and 0.1) were synthesized by microemulsion method. X-Ray diffraction (XRD) was used to find different parameters of crystalline size. The development of the FCC spinel structure was observed by XRD data. The most intense peak of the XRD was identified at 2?=35º.From Debye sherrer's formula, calculated the crystalline size 15nm to 29nm ranges. The lattice constant calculations are decreased with the doping of Praseodymium (Pr3+) contents. The x-ray density increases as the concentration of Praseodymium (Pr3+) doping increases, Because Praseodymium (Pr3+) ion has a greater molar weight than Fe3+ ion. The Absorption band spectra are analyzed by using Fourier Transform Infrared spectroscopy (FTIR).The absorption bands ?1 is known as octahedral stretching bands were found to be in the range of 414 cm-1 and ?2 is the tetrahedral stretching band were found to be in the range of 530cm-1.Dielectric properties of Praseodymium doped Nickel-Zinc Ferrite were measured with impedance Analyzer in the frequency of 1 MHz to 3 GHz range. When Pr3+content concentration increases, the dielectric characteristics, such as dielectric constant, dielectric loss, and tangent loss were also decreased. These measured dielectric characteristics showed that these nanomaterials may be used in higher frequencies devices.
Characterization of Zr-Al Substituted M-Type Barium Hexaferrite Synthesized by Co-Precipitation Method
Authors: Akhtar Shahia Humaira , Shifa Muhammad Shahzad , Mehboob Zeshan , Muhammad Hashim  , Ur Raheem Faseeh
Published: June 2022

Structural properties of Zr-Al substituted M-type of barium hexaferrites, having compositions Ba1-xZr0.5xAl0.3Fe11.7O19, (x= 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) are studied, which were synthesized by using co-precipitation method. These prepared samples are characterized by X-RAY diffraction (XRD) to confirm hexaferrites structure. Fourier transform infrared spectroscopy is used to make tetrahedral (higher frequency band) and octahedral (lower frequency band) clusters of metal oxides in hexaferrites and confirmed the formation of hexaferrites structure. (FESEM) Field emission scanning electron microscopy was used to give micrographs to show that grains are platelet like shaped, which agrees very well with hexaferrites structure. The particle morphology is observed to be porous and non-uniform. The grain size is decreased initially, and then increased with Zirconium additions. Scherer’s formula is applied to calculate particle size, which is observed to change in the range of 18.86 nm-9.43 nm. The grains are bounded together due to interfacial surface tension forces. The optical properties are also studied by UV Vis spectrometer to find the energy band gap, in the range of 2.09ev - 5.15ev and absorbance peak having the range 237.9nm - 252.13nm. This change in energy band gap and absorbance peak is due to the change in the grain size on the zirconium substitution.
Enhancement in Corrosion Resistance and Hardness of AZ91D Magnesium Alloy by Carbon Ion Implantation
Authors: Mumtaz M. Kashif , Murtaza G.
Published: June 2022

To improve the mechanical and corrosion resistance of AZ91D magnesium alloy, carbon ion implantation technique has been carried out using 2 MV Pelletron accelerator on the polished magnesium alloy surface. Vickers hardness test, particle induced X-ray emission (PIXE) analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD) and corrosion tests are employed to analyse the properties. Vickers hardness tests revealed the improvement in surface hardness which we infer is due to the enhancement in dislocation density, as a consequence of carbon ion implantation with varied dose from 1.26×1013 to 8.4×1014 ions-cm-2. That is, the increase in hardness is directly related to the ion dose, variation in lattice parameters, crystallite size, and change in peak intensity, all due to the increase in ion fluence. The non-destructive elemental analysis, PIXE, gave the elemental profile before and after ion implantation. SEM results indicated that singly ionized carbon ion implantation has modified the surface of AZ91D Mg-alloy. XRD results showed that the unexposed and treated samples include ?-Mg and ?-Mg17Al12 phases. XRD results also revealed that after the carbon ion implantation the diffraction peak position and intensity of all the phases shifted. The corrosion tests were carried out using two methods, namely, weight loss method and electrochemical test. The results guided that for a higher dose of ion implantation, the corrosion resistance increased and loss of mass of exposed surface of specimens decreased, which reflect the enhancement of corrosion resistance.
Investigation of Structural, Spectral, and Dielectric Properties of CdSubstituted NiCoPr Nano Ferrites
Authors: Manzoor Alina , Abubakar Muhammad , Afzal Amir Muhammad , Arshad Muhammad Imran , Rasul M. Nasir
Published: June 2022

The effect of cadmium ions on the structural, spectral, and dielectric properties of Pr doped Ni0.4Co0.6-xCdxFe1.95Pr0.05O4 ferrites synthesized by the self-ignited sol-gel process is investigated in the present work. The addition of cadmium ions in place of cobalt ions resulted in an increase in the lattice constant. X-ray diffraction experiment revealed the single-phase spinel structure. The obtained average crystallite size is ranging from 20 - 30 nm. By increasing the substitution of cadmium ions, the dielectric constant, dielectric loss (tan ?) and impedance are noted to increase. SEM study found the spherical grain morphology with some degree of agglomeration. The existence of pores, the sintering process, and the magnetic activity of the particles may be responsible for nanosized particles with a homogeneous particle size distribution. Raman spectra revealed a slight shifting in Raman modes with cadmium addition which may be attributed to the strain produced due to the presence of larger cadmium ions at the Fe3+ site.
Impact of Lanthanum Doping on the Structural, Electrical, and Magnetic Properties of BaFe12O19 Nano Particles
Authors: Gilani Zaheer Abbas , Ul Islam Siraj , Khan Asghar H. M. Noor ul Huda , Hussain Rafaqat , Ahmad Shaikh Furhaj
Published: June 2022

These ferrites had been considered very highly valuable electronic materials for many decades. The ferrite compounds have a hexagonal structure. Nano structural and dielectric features for BaFe12-xLaxO19 (0.00, 0.25.0.50, 0.75, 1.00) nano Hexaferrite (NHFs) was studied present research. The Ba NHF prepared via sol-gel technique. The single phase of barium Nano Hexaferrites of various sample was confirmed by XRD, the average crystalline size calculated in the range of 5 to 13 nm.The lattice parameter lattice constant, X-ray density, bulk density, micro strain and lattice strain are the parameters of XRD which are also calculated. The different parameters of XRD also show the decreasing and increasing trend which is totally depend on the concentration. The hexagonal structure also confirmed by FTIR. There are two frequency band are investigated which are ?1 and ?2 which are associated with tetrahedral stretching band and octahedral stretching band respectively. The different frequency band are calculated at different frequency like ?1=500 to 540 and also ?2 = 413. The dielectric properties also measured in the frequency range from 1 MHz to 3 GHz. There are many others parameters are calculated in dielectric properties such as real and imaginary electric modulus, real and imaginary impedance, dielectric constant, dielectric loss and tangent loss. The parameters of dielectric also showing decreasing and increasing in trend. The real and imaginary impedance plot changes as when the frequency increases, the all the specimens converge on one another, and at a higher frequency, the impedance exhibits coherent nature, which is due to the discharge of space charges.
Structural Elucidation and Magnetic Behavior Evaluation of Nd-doped Nickel-Cobalt Spinel Ferrites
Authors: Waqar Muhammad , A. I. Aljameel
Published: June 2022

Nano ferrites crystals of Ni0.4Co0.6NdxFe2-xO4 for 0.00 ? x ? 0.08 with step size of 0.02 were synthesized by sol gel technique with annealing at 950 oC for 6 hours. Spinel phase along with a secondary phase for Nd concentration x ? 0.04 due to formation of NdFeO3 was observed in XRD patterns. Lattice constant and grain size were found in decreasing trend with increasing concentration of Nd as compared to that of undoped nickel cobalt ferrites. X-ray density and porosity both were increased with increasing concentration of neodymium. Two characteristics frequency bands were observed in the range of 400cm-1 to 550 cm-1 which showed successful formation of spinel structure. It is also the evidence of metal-oxygen bonding at octahedral and tetrahedral sites in spinel ferrites. Also, bands for carbon-hydrogen, carboxyl group, carbon-oxygen stretching and iron-cobalt alloys were observed in the FTIR spectra. By using these values of characteristics frequencies, octahedral and tetrahedral radii were calculated and found in decreasing trend with increasing concentration. Force constants are increasing with increase in neodymium concentration. Saturation magnetization, coercivity and remanence values were calculated from the M-H loops. Saturation magnetization showed the decreasing behavior with increase in neodymium concentration. Coercivity showed increasing values as compared to the base sample and also showing reciprocal relation with saturation magnetization. Magnetic moment is decreasing with increase in neodymium concentration.
Role of Tb-Cr Substitution on the Structural and Magnetic Properties of Cobalt Ferrites
Authors: Hameed Abdul , Khaliq Muhammad Waqas
Published: June 2022

The impact of Tb-Cr substitution in cobalt-based ferrites having composition Co1-xTbxFe2-yCryO4 (x=0.0-0.1, y=0.0-0.5) prepared by solid state reaction method on structural, magnetic and dielectric parameters was explored. Structural analysis was carried out by X-ray diffraction technique. A variation in lattice parameter (a) was observed as a function of doping. The lattice constant ‘a’ increases from 8.37 Å to 8.39 Å, whereas crystallite size (D) decreases from 44 nm to 28 nm with Tb-Cr substitution. Unit cell volume was found in the range 586.8 Å3 - 590.6 Å3. X-ray density, bulk density as well as porosity were also affected with the inclusion of Tb-Cr ions. Saturation magnetization and remanence were observed to decrease from 62 emu/g to 51 emu/g and 13.38 emu/g to 8.29 emu/g, respectively with the addition of Tb-Cr contents. The incorporation of Tb-Cr cations caused the decrease in dielectric parameters like dielectric constant as well as dielectric loss.
erê dos 25 anos do Bando de Teatro Olodum
Authors: Freitas Regia Mabel
Published: June 2022

Este artigo objetivou descrever o espetáculo “Erê” (2015), do Bando de Teatro Olodum, que comemorou as Bodas de Prata (25 anos) deste grupo que promove Teatro Negro desde 1990 em Salvador, na Bahia. No que tange à metodologia, utilizou-se o percursoexploratório-descritivo, a natureza qualitativae para a coleta de dadosoptou-se pela revisão bibliográfica, em geral,negrorreferenciadas,bem como a análise documental do texto dramatúrgico. Os resultados apontaram que essa insurreição cênica, que discute genocídio de jovens pretos, relações familiares, violência nacional, segurança pública, maioridade penal, lei 10.639/03e racismo na mídia, é um grito de intimação com pungentes intenções político-ideológicas defomentar uma luta antigenocida em prol dos direitos civis, políticos e sociais de jovens pretos.
Palavras-chave: Bando de Teatro Olodum; espetáculo Erê; genocídio de jovens pretos.
Cenas pretas e restaurações do encantamento do mundo
Authors: Oliveira Victor Hugo Neves de , Oliveira Tiago
Published: June 2022

Este artigo representa um esforço de valorização das estéticas negras no contexto da criação em dança. O interesse se encontra relacionado com as críticas ao racismo desenvolvidas no trabalho coreográfico de Tiago Oliveira, coreógrafo negro da cidade do Rio de Janeiro, Brasil. Para tanto, organiza-se uma discussão sobre a situação colonial como fenômeno estruturante de um modelo de desenvolvimento baseado na lógica da exploração e da violência. Além disso, defende-se a ideia das cenas negras como políticas de luta e resistência. Metodologicamente, elabora-se um estudo de caso sobre as obras de Tiago Oliveira, buscando compartilhar os processos de pensamento, criação e ativismo político que se encontram nas dramaturgias de duas de suas peças coreográficas: Vira-lata e À margem.
Epistemologias afrocentradas na academia
Authors: Falkembach Maria , Baptista Carle Claudio , Leite Domenice Eloisa
Published: June 2022

Este trabalho apresenta um ensaio etnográfico sobre a experiência de um concurso público para docente efetivo em danças afro-brasileiras ocorrido em universidade federal do sul do Brasil. O texto busca narrar a singularidade do evento, que tornou evidente o choque epistemológico entre os saberes forjados em cultura afrocentrada e o conhecimento acadêmico eurocêntrico colonizador. Apresenta o modo como a banca de avaliação, constituída pelos(as) autores(as) do texto, construiu meios para manter uma postura anti-racista dentro de um sistema estruturalmente racista. O ensaio toma as perspectivas dos Estudos da Performance e da Exunêutica, para descrever as performances dos(as) candidatos(as) e as práticas em danças afro-brasileiras, cuja lógica destoa profundamente das danças acadêmicas, assentadas em modelos racionalistas de sistematização e difusão. Dentre esses princípios, identificou-se que a conexão com a ancestralidade é um dos elementos basilares da perspectiva afrocentrada. A escrita explicita o concurso como encruzilhada, na qual a banca construiu uma conduta em que os papeis de etnógrafos(as) e avaliadores(as) se sobrepunham, na medida em que o exercício de escuta e de definição de critérios se teciam. O artigo conclui que este concurso constituiu-se numa situação exemplar em que os critérios acadêmicos precisaram ser readequados para acolher a epistemodiversidade.
Pneumonia e elementos climáticos: análise comparativa entre Balneário Camboriú e Erechim
Authors: Brito Silveira Rafael , Murara Pedro Germano
Published: June 2022

As doenças respiratórias, incluindo a pneumonia, representam boa parte das enfermidades existentes na sociedade atual. Diversos autores, ao longo do tempo, evidenciam a influência dos elementos climáticos na saúde das populações. Nesse sentido, o presente artigo tem por objetivo investigar o impacto dos elementos climáticos nos registros de internações diárias por pneumonia em Balneário Camboriú e Erechim, individualmente e comparativamente. Por meio de análises gráficas e estatísticas, com base na correlação de Spearman (α = 5%), concluiu-se que a temperatura do ar em decréscimo (resfriamento) apresenta impacto significativamente estatístico na taxa de internação, evidenciando maiores picos nos registros de pneumonia na estação de inverno, bem como nas estações de transição (primavera e outono). Em Erechim, ocorreram os maiores registros de internações, proporcionalmente, quando comparados à localidade catarinense. Esses resultados se justificam pelos registros mais evidentes de menores temperaturas em Erechim. Além disso, sugere-se que as condições socioeconômicas inferiores da localidade sul-rio-grandense, em comparação com a catarinense, impactem de maneira mais evidente na enfermidade.
Palavras-Chaves: Clima e saúde; Geografia da saúde; Correlação; Doença respiratória.
Percepção ambiental e legibilidade do espaço: um estudo no contexto universitário
Authors: Peruzzo Gusman Samara , Marques Ramos Ana Paula , Azevedo Arana Alba Regina
Published: June 2022

A produção desordenada do espaço urbano gera consequências negativas no bem-estar e na qualidade de vida dos habitantes, promovendo, danos ambientais que podem der irreversíveis. O artigo objetiva analisar a percepção ambiental no ambiente universitário e entender como a legibilidade do espaço ajuda na percepção ambiental. Trata-se de uma pesquisa aplicada e exploratória, utilizando trabalho de campo de abordagem qualitativa, os dados foram obtidos através das entrevistas e observação participante. Os entrevistados foram divididos em três classes: aluno, professor e colaborador. Eles foram questionados sobre o significado do Campus, elementos distintivos do local, indicações do percurso mais comum feito pelos entrevistados e justificativas das indicações dos elementos distintivos. Predominaram definições positivas nas classificações sobre o significado do Campus, sendo: amplo e arborização/árvores, citadas por 25% dos entrevistados. Os resultados obtidos indicam que os mapas mentais foram instrumentos importantes e eficazes, para identificar a construção do conhecimento espacial e legibilidade por parte dos estudantes, professores e servidores do campus.
Palavras-chave: Paisagem. Espaço urbano. Universidade. Areas verdes.
A secular formação territorial sertaneja das “Terras da Santa” no distrito de Buenolândia, cidade de Goiás/GO
Authors: Alves da Silva Luciana Helena , Almeida Maria Geralda
Published: June 2022

Apresentamos neste estudo a formação do atual distrito de Buenolândia, na cidade de Goiás/GO, desde seu referencial histórico até a produção socioespacial e simbólica dos seus habitantes, pela abordagem Cultural em Geografia. O objetivo desta discussão dá-se a partir de uma perspectiva histórica que aborda a encarnação das experiências dos habitantes na paisagem do distrito, suas pegadas sobre esse território. Para a metodologia utilizada nessa pesquisa, além do levantamento bibliográfico, também se realizou com a visita a museus, leitura de acervos e cartórios, trabalhos de campo, confecção de mapas, elaboração teórica e sistematização. A estrutura do artigo divide-se em três partes: O Arraial e as Sesmarias como Marco de Ocupação dos Sertões das Minas dos Goyazes, A Freguesia de Nossa Senhora do Rosário da Barra e a Demarcação Político-Jurídica conferindo o Controle Normatizador da Colônia Portuguesa e o Distrito de Buenolândia. Conclui-se refletindo sobre este espaço geográfico, com suas mudanças administrativas que perpassam desde o Arraial, a Freguesia ao Distrito, percorrendo seu ciclo de formação territorial composta e reconhecida até agora.
Palavras-chave: Espaço. Lugar. Território. Toponímia. Geografia Cultural.
Mekaron Nhyrunkwa: reconhecimento do território cultural Mebêbgôkre a partir do acidente do voo Gol 1907
Authors: Kokometi Waurá Txucarramãe Mayalu , Araújo Kárita de Fátima , Teixeira Vinicius Modolo
Published: June 2022

O conceito de território se desenvolveu através da história do pensamento geográfico como uma de suas ferramentas analíticas mais importantes. Nesse sentido seu uso exerce importante papel para compreensão de questões atuais, como a luta por direitos e conflitos sociais, derivadas de embates de diferentes formas de poder. Nesse trabalho, demonstramos como o reconhecimento do direito a compensações por danos imateriais de cunho cultural para os indígenas Mebêngôkre, derivadas do acidente com o voo Gol 1907, transformou-se em uma conquista para seu povo e, em extensão, para outras etnias, tornando-se um marco para a luta indígena no Brasil.
Palavras-chave: Mebêngôkre. Território Indígena. Compensações.
Influência da Infraestrutura de Transportes sobre a Temperatura de Superfície em um corredor BRT, na cidade de Goiânia/GO
Authors: Tobias Portis Gabriela , Mota dos Santos Alex , Gioppo Nunes Fabrizia
Published: June 2022

A artificialização em áreas urbanas contribuem para concentração de problemas ambientais diversos, dentre os quais, a alteração do microclima urbano, incluindo a temperatura da superfície terrestre. Assim, a presente pesquisa tem como objetivo analisar os impactos da construção de um Sistema Bus Rapid Transit (BRT), localizado na cidade de Goiânia, sobre a temperatura da superfície terrestre, antes e após a sua implantação. A metodologia contemplou a análise de imagens de sensoriamento remoto orbital do satélite Landsat 8, sensores OLI e TIRS, manipuladas em um Sistema de Informação Geográfica (SIG). Para tanto, foram necessários o cálculo da temperatura de brilho; correção da emissividade e; a temperatura da superfície terrestre. Os resultados revelam como a alteração da paisagem urbana, influenciada pelo corredor de transportes, é uma das principais causas das mudanças de temperatura da superfície terrestre (TST), mostrando a intensificação de altas temperaturas em áreas onde houve o aumento de superfícies pavimentadas e comerciais, e redução da temperatura onde empregou-se manejos de arborização.
Palavras-chave: Uso da Terra. Impacto ambiental. Transportes. Microclima.
Agronegócio e urbanização no Triângulo Mineiro: As “cidades da cana” e as especificidades do urbano sob o efeito do setor sucroenergético
Authors: Fachini Vicente Pereira Mirlei
Published: June 2022

O estudo avalia aspectos territoriais da atividade sucroenergética (produção de cana de açúcar e derivados) em pequenos núcleos urbanos do Triângulo Mineiro (Minas Gerais), sedes de municípios que conhecem significativa expansão dos plantios e da produção agroindustrial neste início de século. Estes espaços, a que estamos denominando como “cidades da cana”, tornam-se economicamente dependentes do setor sucroenergético e a falta de alternativas de trabalho cria um cotidiano restrito para a população, ainda que o poder público aposte na atividade como indutora de desenvolvimento.  
Palavras-chave: Cana-de-açúcar. Urbanização. Pequenas cidades. Triângulo Mineiro (Minas Gerais, Brasil)
KEY LEARNING THEORIES AND THEIR IMPLICATIONS IN TEACHING
Authors: SHAKYA Mr. AMIT , PADHAN Dr. ANANDA
Published: June 2022

Mr. AMIT SHAKYA, 2Dr. ANANDA PADHAN
Capítulo 11. Narrativas interactivas e inmersivas
Authors: Vázquez-Herrero Jorge , Pérez-Seijo Sara
Published: June 2022

La exploración de nuevas formas de contar es una de las líneas de innovación más frecuentes en los medios de comunicación. En los medios nativos digitales se convierte en una necesidad y una oportunidad. Este trabajo revisa la aplicación de técnicas interactivas e inmersivas en los formatos narrativos periodísticos y describe su implementación en los medios nativos digitales.

Palabras clave: medios digitales, medios nativos digitales, cibermedios, medios de comunicación, periodismo digital, periodismo narrativo, narrativas interactivas, narrativas inmersivas.
Capítulo 12. Coproducción de contenido
Authors: Sixto-García José , Rodríguez-Vázquez Ana Isabel
Published: June 2022

La multimedialidad, la hipertextualidad y la interactividad de Internet posibilitaron que los usuarios pudieran inmiscuirse en los procesos productivos. Este estudio explica cómo se produce la evolución del concepto de los usuarios como consumidores a cocreadores de contenidos, y los desafíos que implica.

Palabras clave: medios digitales, medios nativos digitales, cibermedios, medios de comunicación, periodismo digital, coproducción de contenidos, cocreación de contenidos digitales.
Capítulo 18. Periodistas ante la automatización y la Inteligencia Artificial: la importancia de la formación
Authors: Toural-Bran Carlos , Vizoso Ángel
Published: June 2022

La Inteligencia Artificial está más presente en el día a día del periodismo de lo que los propios profesionales de la información llegan a advertir. Este trabajo analiza los desafíos que los procesos de automatización están produciendo en las redacciones de los medios y en las aulas de las universidades que forman a los nuevos profesionales digitalizados.

Palabras clave: medios digitales, medios nativos digitales, cibermedios, medios de comunicación, periodismo digital, periodismo automatizado, inteligencia artifici
Capítulo 5. Medios nativos digitales de referencia
Authors: Vázquez-Herrero Jorge
Published: June 2022

La búsqueda de nuevas fórmulas narrativas y de interacción con la audiencia refleja un grado significativo de experimentación que protagonizan los medios nativos digitales, al no estar atados a modelos rígidos de la industria tradicional. Este estudio repasa la trayectoria y principales rasgos de ocho medios nativos digitales de referencia en el panorama europeo y español de los últimos años.

Palabras clave: medios digitales, medios nativos digitales, cibermedios, medios de comunicación, periodismo digital, innovación, modelos de negocio.
PEMBENTUKKAN POJOK STUNTING UNTUK PENCEGAHAN DAN PENANGANAN STUNTING PADA MASA PANDEMIK COVID-19 DI RW.13 DESA SUKAMULYA KABUPATEN BANDUNG
Authors: Herawati Ade Tika , Siti Jundiah Rd , Sumbara Sumbara , Manaf H.Manaf , Widyawati Widyawati
Published: June 2022

Pengabdian pada masyarakat ini dilatarbelakangi oleh masih tingginya angka Stunting baik di Indonesia 30,8%, Jawa Barat 35,5%  maupun Kabupaten Bandung 35,2%. Hasil Angka Stunting yang tinggi ini menyebabkan berbagai masalah yang juga akan berdampak terhadap masa depan generasi penerus bangsa sehingga memerlukan penaganan yang tepat. Penyebab Stunting yang multidimensi memerlukan penanganan yang multisektor pula dengan melibatkan masyarakat. Menurut Hasil wawancara kepada Kepala Desa Sukamulya Kecamatan Rancaekek kabupaten Bandung, angka Stunting cukup tinggi yaitu sebanyak 107 Balita  dari total 600 Balita di desa tersebut, serta angka ibu hamil yang kurang energi protein sebanyak 16 orang dari 2.552 jumlah WUS. Desa Sukamulya terdiri dari 13 RW dimana angka kejadian Stunting tertinggi berada di 2 RW yaitu RW 11 dan RW 13. Data yang didapatkan dari hasil wawancara dengan Kepala Desa Sukamulya  angka stunting di RW 11 sebanyak 18 Balita, WUS 192 Orang dan Jumlah ibu Hamil sebanyak 4 Orang, angka stunting di RW 13 sebanyak 17 Balita, WUS 187 Orang dan Jumlah ibu Hamil sebanyak 6 Orang.  Upaya yang dilakukan adalah dengan pembentukkan Pojok Stunting sebagai salah satu upaya untuk menangani dan mencegah peningkatan angka Stunting. Upaya yang dilakukan adalah dengan memberikan Pendidikan kesehatan tentang Stunting, perbaikan gizi anak Balita dan penkes Inovasi Makanan yang sebelumnya dilakukan pretest dan Post Test diakhir kegiatan. Hasil yang di dapatkan adalah adanya peningkatan pemahaman para kader terhadap stunting dan penanganannya. Diakhir kegiatan juga membentuk Pojok Stunting sebagai upaya deteksi dini dan skrining dan pemantauan terhadap kejadian Stunting di Rw.13 Desa Sukamulya. Adapun mitra dalam pengabdian kepada Masyarakat ini adalah Rumah Desa Sehat yang di ketuai oleh Ibu Dede Rohana. Tujuan pengmas ini adalah untuk mendukung penekanan angka kejadian Stunting di Rw.13 Desa Sukamulya dan membantu meningkatkan pemahaman masyarakat terkait Stunting dan Penatalaksanaannya.
EDUKASI PENTINGNYA PEMERIKSAAN RHESUS PADA SISWA SMA AISIYAH 1 PALEMBANG
Authors: Bastian Bastian
Published: June 2022

Pemeriksaan golongan darah penting dilakukan untuk membantu masyarakat mengetahui golongan darah dan Rhesus masing-masing, kegiatan pemeriksaan golongan darah kepada masyarakat umumnya untuk memberikan pengetahuan tentang pentingnya mengetahui golongan darah dan Rhesus. Pemeriksaan golongan darah dan rhesus dilakukan di SMA Aisiyah 1 Palembang dengan metode edukasi melalui media poster dan melakukan demonstrasi pentingnya pemeriksaan golongan darah dan rhesus. Pada hasil pemeriksaan golongan darah di SMA Aisiyah 1 Palembang didapatkan siswa yang bergolongan darah A, B, AB, O berturut-turut dengan persentasi 40%, 20%, 20%, dan 50% dan hasil pemeriksaan Rhesus di SMA Aisiyah 1 Palembang didapatkan 100% siswa memiliki Rh-Positif (Rh+).  Pemeriksaan rhesus sangat berpengaruh terhadap Kehamilan dan Transfusi Darah diberikan jika terjadi ketidakcocoakan Rhesus.
EDUKASI MANFAAT AKTIVITAS FISIK PADA LANSIA DI KECAMATAN SUKARAMI, PALEMBANG
Authors: Yudiansyah Yudiansyah
Published: June 2022

Aktivitas fisik memiliki manfaat yang besar terhadap fungsi tubuh para lansia. Diantaranya adalah agar terhindar dari penyakit kardiovaskular, hipertensi, depresi hingga mencegah terjadinya cidera akibat terjatuh. Faktor tubuh yang sudah menurun membuat para lansia harus benar-benar memperhatikan dosis latihan dan jenis latihan yang dilakukan. Untuk itu kegiatan ini memberikan edukasi terhadap para lansia untuk melakukan aktivitas fisik dengan baik agar mendapatkan fungsi yang diinginkan. Hasil kegiatan ini di temukan lansia dengan aktivitas fisik ringan 17 orang (55%), dan lansia dengan aktivitas fisik sedang 9 orang (30%) sedangkan lansia dengan aktivitas fisik berat 4 orang(15%).
Synthesis, Characterization and Biological Screening of some Newer Carbazole Conjugates
Authors: Verma Neetu , Awasthi Shruti , Jain Vikrant
Published: June 2022

A novel series of novel 5-[(9H-carbazol-9-yl)methyl]-N-[(substituted phenyl)(piperazin-1-yl)methyl]-1,3,4-oxadiazol-2-amines (4a–o) products were synthesized from starting material of carbazole, which were on reacted with ethyl chloro-acetate yielded to form ethyl 2-(9H-carbazole-9-yl)acetate (1). Compound 1 on reacted with semicarbazide followed by cyclisation by sulphuric acid to give 5-((9H-carbazole-9-yl)-1,3,4-oxadiazol-2-amine (3), which through Mannich condensation with piperazine and a variety of aromatic aldehydes in the occurrence of acetic acid to form titled compounds (4a–o). The structures of compounds were characterized by UV, FT-IR, 1H-NMR and MS spectral studies, and by elemental analysis.