bluuebunny/crossref_metadata_2025 huggingface dataset:
SUJEITO DISCURSIVO EM LE GRAND ROUTIER DE MER
Authors: Bessa Rita Maria Ribeiro
Published: July 2023

Os roteiros da Carreira da Índia e da Carreira do Brasil,traduzidos pelo holandês J. H. van Linschoten para a língua francesa,integram a coletânea Le grand routier de mer (1610). A partir da relevânciaatribuída ao eu (Je), que nos roteiros se refere ao piloto portuguêse ao tradutor, adotam-se pressupostos teóricos da escola francesade análise do discurso acerca da noção de sujeito, sobretudo, a partirdas ideias de S. Possenti. De acordo com os fatos linguístico-discursivosapresentados, verifica-se que o sujeito de Le grand routier de mer é osujeito-tradutor que assume diversas faces, a saber, sujeito-de-direitoespião-autor.
LIBERALISMO AO ESTADO CONTEMPORÂNEO
Authors: Viana de Souza Joselito
Published: July 2023

O artigo analisa a falta de uma definição política clara para o Estado. Para tanto, é importante que se resgatem algumas teoriasmarxistas do Estado, como também o histórico do liberalismo e neoliberalismo. Dentro deste contexto, encontra-se o capitalismo presente e futuro em crise e os problemas pós-neoliberal. Ao final, são apontados elementos visando contribuir para um re-estudo da questão neoliberal.
TEOLOGIA DA PROSPERIDADE, MERCANTILIZAÇÃO DO SAGRADO
Authors: Silva Deyvid Souza Bacelar da
Published: July 2023

Este trabalho trata das relações entre a Teologia da Prosperidade(TP), uma das características principais da Igreja Celular noModelo dos Doze (ICMD), e as ideias que estão presentes na sociedadecapitalista, destacando o mercado e a cultura do consumo. A pesquisa,realizada em Igrejas de Feira de Santana – Bahia, buscou fazer umaanálise da TP e da gestão e cultura organizacional adotada por essemodelo de igreja, bem como verificar como as técnicas e estratégias damoderna administração influenciaram e continuam influenciando no discursoe na práxis dos líderes desse modelo de igreja. Objetiva-se contribuirpara uma melhor compreensão desse imenso campo das estruturas religiosas,através da pesquisa sobre a ICMD e sua teologia.
ONDE A CULTURA É MATÉRIA-PRIMA DA EDUCAÇÃO POPULAR E DO DESENVOLVIMENTO COMUNITÁRIO
Authors: Da Silva Luciene Aparecida
Published: July 2023

Num cenário mundial intensamente marcado pelo processohegemônico de globalização, as contradições e demandas sociais se acentuam:num dos vértices, um acelerado avanço científico e tecnológico nuncaantes experimentado pela humanidade, noutro, uma massa de pessoasdesacreditadas, para as quais a educação formal tem se mostrado poucoeficaz na promoção da emancipação humana. Este artigo aborda a educaçãopopular e o desenvolvimento comunitário como uma das instânciasconstitutivas do processo de enfrentamento da exclusão social tendoa cultura como sua matéria-prima. Na discussão, são apresentadas diversasformas de ação, relação e atuação de uma organização do TerceiroSetor – Centro Popular de Cultura e Desenvolvimento (CPCD) - comoagente fomentador do ativismo popular, capital social e formação deredes. As práticas empreendidas por esta Organização não Governamental(ONG) constituem alternativas eficazes ao enfrentamento da ausênciaou insuficiência de políticas públicas direcionadas ao atendimento dasdemandas populares.
CONSTRUÇÃO DO PROCESSO DE DEMOCRATIZAÇÃO DA GESTÃO PÚBLICA: UMA ABORDAGEM INTRODUTÓRIA À SUA COMPREENSÃO
Authors: Menezes José Lima de
Published: July 2023

O Estado, como ente regulador das relações sociais, historicamentetem estabelecido uma relação com a sociedade civil. Trata-sede uma relação que se ressalta por características próprias, as quais sãodefinidas por cada contexto espaço-temporal específico. No Brasil, ainteração entre Estado e sociedade civil tem sido marcada por avançose retrocessos, quando se tornam cada vez mais evidentes os requerimentosda sociedade em participar na definição e controle de políticaspúblicas, na esteira do processo de democratização da gestão pública.Diante deste panorama, este artigo discute a evolução do processo participativoda sociedade civil na administração pública1, buscando identificar osentraves mais evidentes para a sua consolidação.
CONCEITOS JURÍDICOS INDETERMINADOS E O PROCESSO DE INTERPRETAÇÃO DO SENTIDO DA NORMA JURÍDICA NA DISCRICIONARIEDADE ADMINISTRATIVA
Authors: Bezerra Tássio Túlio Braz
Published: July 2023

O presente trabalho traça uma discussão da discricionariedadeadministrativa, analisando os conceitos jurídicos indeterminados, discorrendosobre a incidência da fluidez da linguagem na indeterminaçãodo sentido das normas jurídicas. Nesta perspectiva, afirma-se o problemados conceitos jurídicos indeterminados como decorrentes da própriaporosidade da linguagem natural, caracterizando-os como campo específicode atuação da discricionariedade administrativa, haja vista a suanecessidade de valoração para a devida interpretação do sentido normativo.Assim, tem-se como indispensável a atividade interpretativa do aplicadordo direito, de modo a delimitar o campo de discricionariedade, tendocomo parâmetros o caso concreto, em sua junção com o todo normativoe os valores sociais, aliados à possibilidade de legitimação discursivapautada no consenso social. Posteriormente, verificam-se as possibilidadesde controle jurisdicional, segundo a natureza do Estado e concepçõesde racionalidade, conforme o positivismo normativista, o racionalismodworkiano e as teorias discursivas de Viehweg e Perelman.
PRODUÇÃO FAMILIAR: A QUESTÃO CONCEITUAL
Authors: Brito João Carlos Nery de
Published: July 2023

Os agricultores com suas economias de estrutura familiarsão denominados de “pequenos produtores”, “pequenos agricultores”,“colonos”, “camponeses”, “trabalhadores rurais” dentre outras definições.Tais definições terminam por indicar um tipo peculiar de atividadeeconômica. A diferenciação1 existente entre as famílias produtoras contribuipara a dificuldade de se estabelecer conceito que represente arealidade de modo a propiciar entendimento comum. No entanto, a lógicade funcionamento destas economias – voltadas para o atendimentodas necessidades das próprias famílias, e não para a acumulação docapital na forma capitalista – terminam por apresentar traços comuns aessas atividades, possibilitando classificá-las como economias de produçãofamiliar. O conceito de produção familiar, portanto, comporta asdefinições que possam ser atribuídas a essas atividades econômicas desenvolvidaspor famílias agricultoras ou operárias urbanas, já que o modo comorealizam e consomem a riqueza gerada lhes conferem característicaspeculiares.
Architecture and performance evaluation of fiber-granularity routing networks with supplemental grooming by wavelength conversion
Authors: Matsuo Takeshi , Shiraki Ryuta , Mori Yojiro , Hasegawa Hiroshi
Published: July 2023

Fiber-granularity routing networks that adopt wavelength-granularity add/drop and a limited number of wavelength converters are proposed. The express parts of nodes can be optical switches, used as fiber cross-connects (FXCs), as they offer low-cost scaling. However, FXCs cannot route optical signals on a wavelength basis, unlike present wavelength cross-connects (WXCs). This routing restriction degrades the statistical multiplexing effect and decreases fiber utilization efficiency. The restriction is slightly relaxed by the use of wavelength-granularity add/drop operations; however, our numerical simulations show that the degradation can reach around 50% when the number of optical paths in a fiber is 25. This substantial degradation is cost-effectively alleviated by introducing wavelength/optical path grooming with a limited number of wavelength converters, which enhances routing flexibility. Numerical simulations show that our network architecture improves routing performance by 86% compared to fiber-granularity routing networks without wavelength converters, and the performance deterioration relative to present WXC-based networks is suppressed to ∼14%.
Reflective one-to-multi-polarization conversion via separate control of phase and magnitude
Authors: Sun Zhiwei , Ma Xianchao , Liu Run , Zhao Junming , Feng Yijun
Published: July 2023

Polarization manipulation is a key issue in electromagnetic (EM) research. Research on 90° polarization rotators and circularly-polarized wave generators has been widely conducted. In this study, a polarization conversion metasurface that can shift one linearly-polarized EM wave into multi-polarization outgoing waves at certain frequencies is demonstrated, including co-, cross-, left-hand, and right-hand circular-polarization components. The surface was made of periodically arranged chiral meta-atoms. The polarization manipulation method is based on the independent control of phase and magnitude, in which the phase control is based on the Berry-phase theory of linearly-polarized EM waves, while the magnitude control is based on the cavity mode theory of the microstrip structure. Both eigenmode analysis (EMA) and characteristic mode analysis (CMA) were utilized for magnitude control, which was further verified by the surface current distribution. Finally, the metasurface was fabricated and measured, showing good agreement between the measured and simulated results. This research proposed what we believe to be a novel polarization method, which can be potentially applied in polarization manipulation, EM radiation, filters, wireless sensors, etc., over a frequency range from optics to microwave bands.
Transient dynamics of pulsating polarization rotating dual solitons in an ultrafast fiber laser
Authors: Liyang Jin , Chang Zhenghu , Wu Qiang , Long Yu , Qiu Junjie , Gao Lei , Huang Wei , Zhu Tao
Published: July 2023

The state of polarization is essential for a full description of ultrashort pulses. We experimentally observe the transient vector dynamics of pulsating vector solitons with rotating polarizations in a single-wall carbon nanotube mode-locked fiber laser. We acquire the single-shot polarization evolution of two different dual soliton pulsations using a homemade real-time wavelength-resolved state of polarization measurement system. We identify experimentally two different types of dual-soliton pulsations with longer and shorter pulsating periods respectively, and we find that dispersive-caused wave-caused energy exchange may be the reason for the distinct single soliton polarization evolution in multi-soliton cases. Our results are crucial for understanding the essence of soliton behaviour and developing novel potential applications of ultrafast fiber lasers.
Detection of a spinning object using a superimposed optical vortex array
Authors: Ding You , Zhu Xiangyang , Liu Tong , Liu Zhengliang , Qiu Song , Chen Xiaocen , Ren Yuan
Published: July 2023

The optical vortex (OV) carries unique orbital angular momentum (OAM) and experiences a Doppler frequency shift when backscattered from a spinning object. This rotational Doppler effect (RDE) has provided a solution for the non-contact detection of rotating motion. The reported RDE researches mainly use a single OV that generates frequency shifts proportional to its topological charge and has low robustness to light incidence. Here, we show the distinctive RDE of superimposed optical vortex array (SOVA). We analyze the holistic OAM of SOVA which is represented in terms of a superposition of azimuthal harmonics and displays a unique modal gathering effect. In the experiment of RDE, the frequency shift signals of SOVA show a precise mapping to the OAM modes and the modal gathering effect contributes to enhance the amplitude of signals, which has the potential to enhance robustness against non-coaxial incidence. This finding provides a new aspect of RDE and a pioneered example for introducing various SOVAs into rotation detection.
Tunable bandpass microwave photonic filter with largely reconfigurable bandwidth and steep shape factor based on cascaded silicon nitride micro-ring resonators
Authors: Cheng Wei , Lin Dongdong , Wang Pengfei , Shi Shangqing , Lu Mengjia , Wang Jin , Guo Chen , Chen Yifei , Cang Zhao , Tian Zhuang , Liang Zien , Hu Guohua , Yun Binfeng
Published: July 2023

Bandpass microwave photonic filter (MPF) can be achieved based on the well-known phase to intensity conversion method by using phase modulation and single micro-ring resonator (MRR) notch filter. Since MRR could introduce residual phase in handling one optical sideband, the out-of-band radio frequency (RF) rejection ratio and the shape factor of the bandpass MPF are very limited. Here, by introducing another MRR to handle the other optical sideband, the residual phase can be greatly suppressed, thus the filter’s performance can be greatly improved. The proposed bandpass MPF was both verified theoretically and experimentally. Compared with the single MRR, the out-of-band RF rejection ratio and the shape factor were improved by 20 dB and 1.67, respectively. Furthermore, the bandpass MPF’s bandwidth is reconfigurable by adjusting the optical carrier’s frequency or the two MRRs’ amplitude coupling coefficients. The bandpass MPF’s center frequency is also tunable by changing the resonant wavelengths of two MRRs in the opposite direction simultaneously. Experimentally, bandwidth reconfiguration from 0.38 GHz to 15.74 GHz, the shape factor optimization from 2 to 1.23, and frequency tuning from 4 GHz to 21.5 GHz were achieved. We believe that the proposed bandpass MPF has great potential for microwave photonic signal processing.
Thermal-noise-limited, compact optical reference cavity operated without a vacuum enclosure
Authors: Liu Yifan , McLemore Charles , Kelleher Megan , Lee Dahyeon , Nakamura Takuma , Jin Naijun , Schima Susan , Rakich Peter , Diddams Scott , Quinlan Franklyn
Published: July 2023

We present an in-vacuum bonded, 9.7 mL-volume Fabry-Pérot ultrastable optical reference cavity that operates without a vacuum enclosure. A laser stabilized to the cavity demonstrates low, thermal noise-limited phase noise and 5 × 10^{-14} Allan deviation at 1 second.
A Custom 3D Printed Design of Smartphone-Based Adapter for Colorimetric Biomarker Concentration Measurements
Authors: Alawsi Taif , Albawi Zainab , Beraldi Roberto , Mattia Gabriele Proietti , FARIS RAWAA
Published: July 2023

Recently, the emerging interdisciplinary research in biosensing has been increasing, due to the advances in 3D printing technology. In this article, we demonstrate the feasibility of the novel smartphone-based 3D printed design with the aid of an Android application intended solely to measure the concentration of multiple biomarker samples based on the colorimetric detection approach. The optical and electronic elements inside the adapter provide a reliable imaging platform for image acquisition, analysis, rapid testing, and measurements. 3D printed smartphone-based adapter design has been implemented and tested for colorimetric applications in biomarkers including glucose, urea, triglycerides, bilirubin (Total Serum Bilirubin (TSB)), and High-Density Lipoprotein (HDL). The compatible smartphone-based system resulted in a highly reliable regression coefficient (R2) of more than 0.9 for the tested samples. To the best of our knowledge, this is the first report on the effects of multiple illumination sources on multiple biomarkers with a complete set of results depending solely on the smartphone. This enables reliable use of the compatible system in biomarker testing.
Amplification of light pulses with orbital angular momentum (OAM) in nitrogen ions lasing
Authors: Mei Haicheng , Gao Jingsong , Wang Kailu , Dong Jiahao , Gong Qihuang , Wu Chengyin , Liu Yunquan , Jiang Hongbing , Liu Yi
Published: July 2023

Nitrogen ions pumped by intense femtosecond laser pulses give rise to optical amplification in the ultraviolet range. Here, we demonstrated that a seed light pulse carrying orbital angular momentum (OAM) can be significantly amplified in nitrogen plasma excited by a Gaussian femtosecond laser pulse. With the topological charge of ℓ = ±1, we observed an energy amplification of the seed light pulse by two orders of magnitude, while the amplified pulse carries the same OAM as the incident seed pulse. Moreover, we show that a spatial misalignment of the plasma amplifier with the OAM seed beam leads to an amplified emission of Gaussian mode without OAM, due to the special spatial profile of the OAM seed pulse that presents a donut-shaped intensity distribution. Utilizing this misalignment, we can implement an optical switch that toggles the output signal between Gaussian mode and OAM mode. This work not only certifies the phase transfer from the seed light to the amplified signal, but also highlights the important role of spatial overlap of the donut-shaped seed beam with the gain region of the nitrogen plasma for the achievement of OAM beam amplification.
Polarization Imaging and Edge Detection with Image-Processing Metasurfaces
Authors: Alu Andrea , Cotrufo Michele , Singh Sahitya , Arora Akshaj , Majewski Alexander
Published: July 2023

Optical metasurfaces have been recently explored as ultrathin analog image differentiators. By tailoring the momentum transfer function, they can perform efficient Fourier-filtering – and thus potentially any linear mathematical operation – on an input image, replacing bulky 4f systems. While this approach has been investigated in different platforms, and a few techniques have been explored to achieve the required angular response, little effort has been devoted so far to tailor and control also the polarization response of an image-processing metasurface. Here, we show that edge-detection metasurfaces can be designed with tailored polarization responses, while simultaneously preserving an isotropic response. In particular, we demonstrate single-layer silicon metasurfaces yielding efficient Laplacian operation on a 2D image with either large polarization asymmetry, or nearly polarization-independent response. In the former case, we show that a strongly asymmetric polarization response can be used to unlock more sophisticated on-the-fly image processing functionalities, such as dynamically tunable direction-dependent edge detection. In parallel, metasurfaces with dual-polarized response are shown to enable efficient operation for unpolarized or arbitrarily polarized images, ensuring high efficiency. For both devices, we demonstrate edge detection within relatively large numerical apertures, with excellent isotropy and intensity throughput. Our study paves the way for the broad use of optical metasurfaces for sophisticated, massively parallel analog image processing with zero energy requirements.
Partial inhibition of class III PI3K VPS-34 ameliorates motor aging and prolongs health span
Authors: Hu Zhongliang , Luo Yamei , Liu Yuting , Luo Yaru , Wang Liangce , Gou Shengsong , Peng Yuling , Wei Rui , Jia Da , Wang Yuan , Gao Shangbang , Zhang Yan
Published: July 2023

Global increase of life expectancy is rarely accompanied by increased health span, calling for a greater understanding of age-associated behavioral decline. Motor independence is strongly associated with the quality of life of elderly people, yet the regulators for motor aging have not been systematically explored. Here, we designed a fast and efficient genome-wide screening assay inCaenorhabditis elegansand identified 34 consistent genes as potential regulators of motor aging. Among the top hits, we found VPS-34, the class III phosphatidylinositol 3-kinase that phosphorylates phosphatidylinositol (PI) to phosphatidylinositol 3-phosphate (PI(3)P), regulates motor function in aged but not young worms. It primarily functions in aged motor neurons by inhibiting PI(3)P-PI-PI(4)P conversion to reduce neurotransmission at the neuromuscular junction (NMJ). Genetic and pharmacological inhibition of VPS-34 improve neurotransmission and muscle integrity, ameliorating motor aging in both worms and mice. Thus, our genome-wide screening revealed an evolutionarily conserved, actionable target to delay motor aging and prolong health span.
The impact of COVID-19 on the mental health and well-being of ambulance care professionals: A rapid review
Authors: Ebben Remco H. A. , Woensdregt Tim , Wielenga-Meijer Etty , Pelgrim Thomas , de Lange Annet , Berben Sivera A. A. , Vloet Lilian C. M.
Published: July 2023

The COVID-19 pandemic has a significant impact on the health and well-being of all healthcare professionals. However, for ambulance care professionals it is unknown on which health outcomes the impact of COVID-19 is measured, and what the actual impact on these health outcomes is. Therefore, the aim of this study was to gain insight in a) which type of health outcomes were measured in relation to the impact of COVID-19 among ambulance care professionals, and b) to determine the actual impact on these outcomes. A rapid review was performed in PubMed (including MEDLINE) and APA PsycInfo (EBSCO). All types of study designs on health and well-being of ambulance care professionals were included. Selection on title an abstract was performed by pairs of two reviewers. Full text selection, data extraction and quality assessment were performed by one reviewer, with a check by a second independent reviewer. The systematic searches identified 3906 unique hits, seven articles meeting selection criteria were included. Six studies quantitatively measured distress (36,0%) and PTSD (18.5%-30.9%), anxiety (14.2%-65.6%), depression (12.4%-15.3%), insomnia (60.9%), fear of infection and transmission of infection (41%-68%), and psychological burden (49.4%-92.2%). These studies used a variety of instruments, ranging from internationally validated instruments to self-developed and unvalidated questionnaires. One study qualitatively explored coping with COVID-19 by ambulance care professionals and reported that ambulance care professionals use five different strategies to cope with the impact of COVID-19. There is limited attention for the health and well-being of ambulance care professionals during the COVID-19 pandemic. Although the included number of studies and included outcomes are too limited to draw strong conclusions, our results indicate higher rates of distress, PTSD and insomnia compared to the pre-COVID-19 era. Our results urge the need to investigate the health and well-being of ambulance care professionals during and after the COVID-19 pandemic.
Economic freedom, inclusive growth, and financial development: A heterogeneous panel analysis of developing countries
Authors: Yang Zhengrong , Vitenu-Sackey Prince Asare , Hao Lizhong , Tao Yuqi
Published: July 2023

The effective and efficient management of financial systems and resources fosters a socioeconomic climate conducive to technological and innovative advancement, thereby fostering long-term economic growth. The study used panel data from 72 countries classified as less financially developed between 2009 and 2017 to examine the role of economic freedom and inclusive growth in financial development. For the long-run estimations, we utilised the linear dynamic panel GMM-IV estimator, panel corrected standard errors (PCSE) linear regression method, and contemporaneous correlation estimator, a generalised least squares method. Our analyses indicate that economic liberty, inclusive growth, and capital stock significantly contribute to financial development in a positive manner. Moreover, inclusive growth contributes positively to overall financial development by enhancing economic freedom. Regardless of exogenous and endogenous shocks, we found that the tax burden and investment freedom are negative drivers of financial development as measured by the overall financial development index. In contrast, protection of property rights, government spending, monetary freedom, and financial freedom are positive and significant drivers of economic growth.
communication éco-responsable d'entreprise autour du care
Authors: Bruneel Emmanuelle
Published: July 2023

Cet article entreprend l’examen des modalités communicationnelles relatives à la démarche de responsabilité sociale et environnementale intitulée « Wecare! » au sein du groupe Etam, le leader industriel français de la lingerie féminine. Il déploie une approche sémio-communicationnelle des discours de promotion de ce programme en analysant les énoncés institutionnels déclinant les actions éco-socio-responsables mises en œuvre par l’entreprise. Il s'agit de mettre en lumière la façon dont les figurations de la communication autour de la « mode durable » dans le domaine de la lingerie relèvent du « paradigme environnemental ». Cette étude d’un dispositif de communication dédié à la démonstration des engagements du groupe Etam cherche à montrer comment les formes énonciatives convoquées reconfigurent les façons de parler du « soutenable ». En disant prendre soin en même temps de « la planète et des personnes » (clientes comme salariées), le discours institutionnel de l’entreprise Etam cherche à articuler dimensions environnementales et sociales de son activité, tout en s’inscrivant dans un paradigme global du care.
mode responsable sur Instagram : encastrement de la communication de marque et de la communication environnementale
Authors: Burlat Claire , Suarez Iris
Published: July 2023

Instagram est un média sur lequel les marques de mode communiquent de plus en plus régulièrement. Nous interrogeons la manière dont ce réseau social participe à produire des discours sur la mode dite responsable. Comment ces discours s’articulent-ils selon les particularités techniques et sémiotiques d’Instagram ? Comment renouvellent-ils les rhétoriques de la communication environnementale tout en construisant des représentations de la mode responsable ? Nous avons analysé les comptes Instagram de trois marques de mode auto-déclarées responsables et mené des entretiens avec des professionnels. Nous formalisons l’idée d’un encastrement de la communication environnementale et de la communication marchande, favorisé par une réactualisation de la notion de « sobriété heureuse » par les marques de mode responsable.
Setting up multicolour TIRF microscopy down to the single molecule level
Authors: Schirripa Spagnolo Chiara , Luin Stefano
Published: July 2023

Investigating biological mechanisms in ever greater detail requires continuous advances in microscopy techniques and setups. Total internal reflection fluorescence (TIRF) microscopy is a well-established technique for visualizing processes on the cell membrane. TIRF allows studies down to the single molecule level, mainly in single-colour applications. Instead, multicolour setups are still limited. Here, we describe our strategies for implementing a multi-channel TIRF microscopy system capable of simultaneous two-channel excitation and detection, starting from a single-colour commercial setup. First, we report some applications at high molecule density and then focus on the challenges we faced for achieving the single molecule level simultaneously in different channels, showing that rigorous optimizations on the setup are needed to increase its sensitivity up to this point, from camera setting to background minimization. We also discuss our strategies regarding crucial points of fluorescent labelling for this type of experiment: labelling strategy, kind of probe, efficiency, and orthogonality of the reaction, all of which are aspects that can influence the achievable results. This work may provide useful guidelines for setting up advanced single-molecule multi-channel TIRF experiments to obtain insights into interaction mechanisms on the cell membrane of living cells.
Fractional Sobolev regularity for solutions to a strongly degenerate parabolic equation
Authors: Ambrosio Pasquale
Published: July 2023

We carry on the investigation started in [P. Ambrosio and A. Passarelli di Napoli, Regularity results for a class of widely degenerate parabolic equations, preprint 2022, version 3,https://arxiv.org/abs/2204.05966v3] about the regularity of weak solutions to the strongly degenerate parabolic equation

ut-div⁡[(|D⁢u|-1)+p-1⁢D⁢u|D⁢u|]=f in ⁢ΩT=Ω×(0,T),u_{t}-\operatorname{div}\Bigl{[}(\lvert Du\rvert-1)_{+}^{p-1}\frac{Du}{\lvert Du% \rvert}\Bigr{]}=f\quad\text{in }\Omega_{T}=\Omega\times(0,T),

where Ω is a bounded domain inℝn{\mathbb{R}^{n}}forn≥2{n\geq 2},p≥2{p\geq 2}and(⋅)+{(\,\cdot\,)_{+}}stands for the positive part. Here, we weaken the assumption on the right-hand side, by assuming that

f∈Llocp′⁢(0,T;Bp′,∞,locα⁢(Ω)),f\in L_{\mathrm{loc}}^{p^{\prime}}(0,T;B_{p^{\prime},\infty,\mathrm{loc}}^{% \alpha}(\Omega)),

withα∈(0,1){\alpha\in(0,1)}andp′=p/(p-1){p^{\prime}=p/(p-1)}. This leads us to obtain higher fractional differentiability results for a function of the spatial gradientDuof the solutions. Moreover, we establish the higher summability ofDuwith respect to the spatial variable. The main novelty of the above equation is that the structure function satisfies standard ellipticity and growth conditions only outside the unit ball centered at the origin. We would like to point out that the main result of this paper can be considered, on the one hand, as the parabolic counterpart of an elliptic result contained in [P. Ambrosio, Besov regularity for a class of singular or degenerate elliptic equations, J. Math. Anal. Appl. 505 2022, 2, Paper No. 125636], and on the other hand as the fractional version of some results established in [P. Ambrosio and A. Passarelli di Napoli, Regularity results for a class of widely degenerate parabolic equations, preprint 2022, version 3,https://arxiv.org/abs/2204.05966v3].
Polyvinylidene fluoride/maghnite nanocomposites: fabrication and study of structural, thermal and mechanical properties
Authors: Khiati Zoulikha , Mrah Lahouari
Published: July 2023

An in-depth study of polyvinylidene fluoride (PVDF) based nanocomposite systems will be the focus of this research. This polymer being hydrophobic and apolar, it will be unlikely to generate strong interactions with clay leaves called organophilic maghnite. The challenge of this study will therefore be to manage the load/polymer interfaces by using montmorillonite with specific surface treatments by adding a surfactant Cetyltrimethylammonium bromide. Therefore, a significant improvement in mechanical and thermal properties was observed. The properties of PVDFNC nanocomposites were evaluated using various physico-chemical techniques (XRD, FTIR, TGA, DSC, TEM, SEM). The results of the structural and thermal measurements carried out on these products reveal that the structural concept of the surfactant influences both the morphological profile, the thermal and mechanical properties of the nanocomposites obtained. Accelerated crystallization is observed in PVDNC nanocomposites as an effective nucleation agent, the crystals formed are predominantly β shaped and have a small number of polar α crystals. Measurements by X-ray diffraction, as well as transmission and scanning electron microscopy indicated that modified maghnite was perfectly distributed 3 % by weight in the polyvinylidene fluoride matrix. The mechanical properties of the nanocomposites were evaluated according to the filler material used and the polyvinylidene fluoride matrix.
Melting point of dried gold nanoparticles prepared with ultrasonic spray pyrolysis and lyophilisation
Authors: Jelen Žiga , Krajewski Marcin , Zupanič Franc , Majerič Peter , Švarc Tilen , Anžel Ivan , Ekar Jernej , Liou Sz-Chian , Kubacki Jerzy , Tokarczyk Mateusz , Rudolf Rebeka
Published: July 2023

A coupled process of ultrasonic spray pyrolysis and lyophilisation was used for the synthesis of dried gold nanoparticles. Two methods were applied for determining their melting temperature: uniaxial microcompression and differential scanning calorimetry (DSC) analysis. Uniaxial microcompression resulted in sintering of the dried gold nanoparticles at room temperature with an activation energy of 26–32.5 J/g, which made it impossible to evaluate their melting point. Using DSC, the melting point of the dried gold nanoparticles was measured to be around 1064.3°C, which is close to pure gold. The reason for the absence of a melting point depression in dried gold nanoparticles was their exothermic sintering between 712 and 908.1°C.
Wear properties of graphene-reinforced aluminium metal matrix composite: A review
Authors: Wakhi Anuar Nur Farah Bazilah , Salleh Mohd Shukor , Omar Mohd Zaidi , Zamri Wan Fathul Hakim W. , Md Ali Afifah , Samat Saziana
Published: July 2023

The recent advancement in graphene-reinforced aluminium matrix composites improves wear behaviour in the production of lightweight and high-performance nanocomposites. Considerable works have been devoted to using graphene nanoparticles as solid self-lubricants to increase wear resistance, minimise friction coefficients, improve service efficiency, and extend the lifespan of related sliding components. In general, wear behaviour often depends on the homogeneous distribution of graphene in the aluminium matrix. The non-uniform distribution of reinforcement due to the tendency of graphene to agglomerate in aluminium matrix and its poor wettability becomes a challenge in developing optimum functional of composites. The wettability of graphene can be enhanced by proper processing methods and sufficient addition of magnesium that can improve the wear and frictional properties of the produced composites. Hence, this review article provides recent findings and the influence of graphene as reinforcement materials in composites, including the effects on wear behaviour and friction properties. This article also discusses new advancements in the effect of graphene in self-lubricating aluminium matrix composites and the impact of reinforcement on the wear mechanisms of the composites. The future direction of the wear properties of MMCs is also covered at the end of the review.
Role of the thermal regime in the defect formation of zinc oxide nanostructures prepared by the thermal decomposition process
Authors: Katekaew Panuwat , Prasatkhetragarn Anurak , Sirirak Reungruthai , Boonruang Chatdanai , Klinbumrung Arrak
Published: July 2023

The intrinsic defect of ZnO depicts a crucial role in the charge transfer owing to the suppression of the exciton recombination, exhibiting superior semiconducting performance. In this study, the intrinsic defect of ZnO nanostructures prepared by direct thermal activation of 300–900 °C was investigated. X-ray diffraction (XRD) was employed to analyze phase, crystallite size, Zn–O bond length, and dislocation density. The relation of Williamson–Hall (W–H) was used to calculate crystallite size and micro-strain. The atomic coordination was approximated through the Rietveld method. Morphology and crystal growth investigation was carried on by scanning electron microscope (SEM) and tunneling electron microscope (TEM), exhibiting rod-like nanostructures transform to oval shape particle with high residual strain when increasing calcination temperature, exhibiting the crystal growth direction of (101). Specific surface and pore analysis reveals a significant value corresponding to SEM analysis. Fourier transform infrared spectroscopy (FT-IR) detected Zn–O stretching vibration bands, presenting a notable increase in the intensity when heat at 600 °C. Relating to the thermal regime, energy bandgap (Eg) was found to be 3.41–3.50 eV as increasing heat treatment temperatures. Photoluminescence (PL) was applied to determine intrinsic defects through emissive spectra. The surface charge was determined through the zeta potential measurement. The photo-induced dye degradation was measured to understand the effect of the defect in semiconductors. The X-ray photoelectron spectroscopy (XPS) confirms the wurtzite structure appearance, including the intrinsic defects. The observed intrinsic defects are discussed, associating with the structural constants, emissive spectra, cationic dye degradation, and binding energy.
A marca do caminhar dos avós na retomada Mbya Guarani Yjêre: Disputando território, história e patrimônio na ponta do arado, Porto Alegre, RS
Authors: Wittmann Marcus A. S.
Published: July 2023

Ao olhar etnograficamente para as pesquisas arqueológicas efetuadas no âmbito do licenciamento ambiental, nota-se como a definição de patrimônio cultural material está em um campo de disputa entre estado, ciências e populações tradicionais. Esse artigo pretende expor os termos dessa disputa através da análise de documentos legais e burocráticos, de relatórios técnicos de arqueologia para o licenciamento ambiental e de um estudo de caso: a retomada Mbya Guarani na Ponta do Arado (Porto Alegre, Rio Grande do Sul, Brasil). Esse panorama mostra como a ciência arqueológica pode ser constrangida por documentos burocráticos e legais, e como demandas políticas e territoriais de grupos indígenas atuam contra definições e práticas instituídas pelo estado, demonstrando suas incongruências e violências.
 
Abstract:
 
When looking ethnographically at the archaeological research carried out within the scope of environmental licensing, it can be seen how the definition of material cultural heritage is in a field of dispute between the state, sciences and traditional populations. This article aims to expose the terms of this dispute through the analysis of legal and bureaucratic documents, technical reports of archeology for environmental licensing and a case study: the reclaim of a Mbya Guarani territory in Ponta do Arado (Porto Alegre, Rio Grande do Sul, Brazil). This panorama shows how archaeological science can be constrained by bureaucratic and legal documents, and how political and territorial demands by indigenous groups act against definitions and practices instituted by the state, demonstrating their inconsistencies and violence.
A estatueta Pé na Boca e a construção de discursos a partir da cultura material
Authors: Alves Daiana Travassos
Published: July 2023

A estatueta ‘pé na boca’ é uma das mais icônicas peças da cerâmica Santarém, datada entre os séculos X e XVI. Este artigo se debruça sobre diversas análises que incluíram este objeto desde sua coleta em uma feição arqueológica no centro de Santarém em meados do século XX. A partir da revisão de 9 estudos de coleção, 7 reportagens online, 3 programas de TV e 9 contas em mídias sociais, apresento uma perspectiva acerca dos diferentes discursos, em particular os arqueológicos, partindo da cultura material de sociedades pré-coloniais amazônicas.
Reactivation of Early-Life Stress-Sensitive Neuronal Ensembles Contributes to Lifelong Stress Hypersensitivity
Authors: Balouek Julie-Anne , Mclain Christabel A. , Minerva Adelaide R. , Rashford Rebekah L. , Bennett Shannon N. , Rogers Forrest D. , Peña Catherine Jensen
Published: July 2023

Early-life stress (ELS) is one of the strongest lifetime risk factors for depression, anxiety, suicide, and other psychiatric disorders, particularly after facing additional stressful events later in life. Human and animal studies demonstrate that ELS sensitizes individuals to subsequent stress. However, the neurobiological basis of such stress sensitization remains largely unexplored. We hypothesized that ELS-induced stress sensitization would be detectable at the level of neuronal ensembles, such that cells activated by ELS would be more reactive to adult stress. To test this, we leveraged transgenic mice to genetically tag, track, and manipulate experience-activated neurons. We found that in both male and female mice, ELS-activated neurons within the nucleus accumbens (NAc), and to a lesser extent the medial prefrontal cortex, were preferentially reactivated by adult stress. To test whether reactivation of ELS-activated ensembles in the NAc contributes to stress hypersensitivity, we expressed hM4Dis receptor in control or ELS-activated neurons of pups and chemogenetically inhibited their activity during experience of adult stress. Inhibition of ELS-activated NAc neurons, but not control-tagged neurons, ameliorated social avoidance behavior following chronic social defeat stress in males. These data provide evidence that ELS-induced stress hypersensitivity is encoded at the level of corticolimbic neuronal ensembles.

SIGNIFICANCE STATEMENTEarly-life stress enhances sensitivity to stress later in life, yet the mechanisms of such stress sensitization are largely unknown. Here, we show that neuronal ensembles in corticolimbic brain regions remain hypersensitive to stress across the life span, and quieting these ensembles during experience of adult stress rescues stress hypersensitivity.
Estereotipos de género: conflicto en el sistema corporativo
Authors: Ariza Hernández Ángela María
Published: July 2023

Actualmente, las organizaciones buscan un camino que les permita promover la competitividad, el desarrollo económico y sostenible en la sociedad, contribuyendo con la justicia social y haciendo uso de buenas prácticas en sus proyectos de responsabilidad social empresarial. A pesar de esto, pocos esfuerzos se han concentrado en eliminar la inequidad de género en el sistema corporativo, siendo este un camino para alcanzar el objetivo. Reconocer a la mujer como componente social que dinamiza la economía permite maximizar su participación dentro de las instancias del gobierno corporativo, contribuyendo con la equidad de género como elemento ganador que provee valor a la organización y es considerado de alto impacto. Por esta razón, el aporte de este proyecto aplicado empresarial es proporcionar a las empresas una guía de trabajo con estrategias puntuales que les permita contribuir en fomentar la equidad de género, la participación de la mujer en la organización y recuperar sus derechos fundamentales, de manera práctica, optimizando el recurso y haciendo uso de las herramientas con las que cuenta actualmente el modelo organizacional. Este proyecto plantea acciones, que desde la gobernabilidad corporativa, contribuyen como posible solución a esta problemática, incluyendo la participación en un Modelo de Colaboración Femenina, Inspiring Girls, el cual representa otra manera de eliminar estereotipos de género en la organización, usando redes de voluntariado.
Short date palm tree fibers / polyepoxy composites prepared using RTM process: Effect of TEMPO mediated oxidation of the fibers
Authors: Sbiai Adil. , Maazouz Abderrahim , Fleury Etienne , Sautereau Henry , Kaddami Hamid
Published: July 2023

Short date palm tree lignocellulosic fibers were used as a reinforcing phase in a polyepoxy thermoset commodity resin. Unmodified fibers as well as counterparts chemically oxidized using TEMPO catalyst mediation were used as fillers for composite materials prepared in a Resin Transfer Molding process. The preparation was facilitated in the case of the composites based on oxidized fibers. During the process, the front displacement of injected resin was more regular, more homogeneous, and faster in the case of oxidized fibers. The morphology, thermal and mechanical properties of the resultant composites were characterized by SEM, DSC, DMA, as well as three-point bending and Charpy impact tests. An elevated reinforcing capability of the oxidized fibers as compared to their unmodified counterparts was demonstrated, particularly by a high strain test in the glassy state. This confirmed the enhanced filler/matrix interface observed in such materials during the process and in the final composite as analyzed by SEM. No significant difference in reinforcing capability of the two kinds of filler was observed in the DMA analysis.
Fast pyrolysis of enzymatic/mild acidolysis lignin from moso bamboo
Authors: Lou Rui , Wu Shu-bin , Lv Gao-jin
Published: July 2023

The characteristics of enzymatic/mild acidolysis lignin (EMAL) isolated from moso bamboo were investigated using pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Pyrolysis temperature as a factor on products was studied, and the pyrolysis mechanism was inferred with respect to the dominating products. Research results showed that pyrolysis products derived from EMAL pyrolysis were mainly heterocyclic (2,3-dihydrobenzofuran), phenols, esters, and a minor amount of acetic acid. Pyrolysis temperature had a distinct impact on yields of pyrolysis products. As pyrolysis temperature increased, the yield of 2,3-dihydrobenzofuran rapidly decreased; however, yields of phenols increased smoothly. It can be obtained that, at the low temperatures (250-400oC), pyrolysis products were mainly 2,3-dihydrobenzofuran, and the highest yield was 66.26% at 320oC; at the high temperatures (400-800oC), pyrolysis products were mainly phenols, and yields hit their highest level of 56.43% at 600 oC. A minor amount of acetic acid only emerged at 800°C. Knowledge of pyrolysis products releasing from EMAL and the pyrolysis mechanism could be basic and essential to the understanding of thermochemical conversion of EMAL to chemicals or high-grade energy.
Characteristics of nanofibers extracted from kenaf core
Authors: Jonoobi Mehdi , Harun Jalaluddin , Tahir Paridah Md. , Zaini Lukmanul Hakim , SaifulAzry Syeed , Makinejad Majid Davoodi
Published: July 2023

Cellulose nanofibers were isolated from kenaf core fibers by employing chemo-mechanical treatments. The morphologies and sizes of the fibers were explored with environmental scanning electron microscopy (ESEM) and transmission electron microscopy (TEM). The results of chemical analysis showed that the cellulose contents of the bleached pulp fibers and nanofibers increased from 46% to 92% and to 94%, respectively. Most of the produced nanofibers had diameters in the range of 20 to 25 nm, whereas kenaf nanofibers ranged in diameter diameters from 10 to 75 nm. Fourier transform infrared spectroscopy (FTIR) analysis revealed the removal of lignin and the majority of the hemicelluloses from the kenaf core fibers. The thermogravimetric analysis (TGA), which was carried out to evaluate the thermal properties of the fibers, demonstrated that the thermal stabilities of these fibers were increased by the chemo-mechanical treatments. The results of X-ray analysis confirmed that chemical and mechanical treatments can improve the crystallinity of fibers.
ECF bleaching with a final hydrogen peroxide stage: Impact of the chemical composition of Eucalyptus globulus kraft pulp
Authors: Loureiro Pedro E. G. , Domingues Eva F. , Evtuguin Dmitry V. , Carvalho M. Graça V. S.
Published: July 2023

Two industrial elemental chlorine free (ECF) bleaching sequences, D0(EOP)D1(EP)D2 and OQ(PO)DP, are compared with respect to the bulk content of lignin, carboxyl, hexeneuronic acids (HexA), and reducing groups after each bleaching stage. HexA groups contribute significantly to the total content of carboxyl groups, and their degradation during chlorine dioxide bleaching is reflected by a decrease of the carboxyl content. The higher degradation using an enhanced use of oxygen-based bleaching chemicals is associated with a higher fiber charge reduction, mainly due to xylan depletion. Additionally, the effect of process variables of a laboratory final hydrogen peroxide stage on the chemical composition of the fully bleached pulp (D0(EOP)D1P and OQ(PO)DP) is studied. The ability of final peroxide bleaching to raise the content of carboxyl groups is dependent on the operating conditions and pulp bleaching history. A balance between carbohydrate oxidation and dissolution of oxidized groups determines the effect on fiber charge. The effect of hydrogen peroxide stabilizers added into the final stage on the content of carboxyl groups is also reported.
Influence of N,N-dimethylacetamid on the thermal and mechanical properties of polymer-filled wood
Authors: Hamdan Sinin , Rahman Md. Rezaur , Ahmed Abu Saleh , Talib Zainal Abidin , Islam Md. Saiful
Published: July 2023

Mercerized wood species were impregnated with N, N-dimethylacetamid. The FT-IR showed enhanced absorption at 1419 cm-1(-C-/CH3), and the 1267 cm-1 (-N-/ CH3) stretching band confirmed the polymerization reaction. Differential scanning calorimetric analysis indicated that the decomposition temperature of WPC gives a higher thermal stability compared to the raw material. WPC yielded higher MOE and MOR compared to the untreated wood. The Young’s modulus of Xylopia Spp Artocarpus Rigidus and Eugenia Spp were significantly different between raw wood and WPC. The increase in the stiffness and the thermal stability of the composites increased due to the crystallinity of WPC as indicated by XRD analysis.