bluuebunny/crossref_metadata_2025 huggingface dataset:
Buckling analysis of tape springs using a rod model with flexible cross-sections
Authors: Bourgeois Stéphane , Cochelin Bruno , Guinot François , Picault Elia
Published: July 2021

This work is devoted to the study of tape springs behaviour. We focus on the instabilities that lead to the creation of localised folds, due to the flattening of the cross-section. Depending on the kind of loading, the folds can move along the tape, split or disappear. Using an extended four parameters rod model with flexible cross-sections, we study several modes of instabilities (number and localisation of folds) for such structures submitted to an overall compression or bending.
Modified Lees–Edwards Boundary conditions and viscous contact for numerical simulations of particles in a shear flow
Authors: Verdon Nicolas , Lefebvre-Lepot Aline , Laure Patrice , Lobry Laurent
Published: July 2021

We present a way to handle contacts between rigid particles in shear flow. The influence of such a modeling is shown by studying an example with 13 particles in 3D. Studying a concentrated suspension in 2D, we demonstrate that contact modelling as well as choice of boundary conditions influences the macroscopic properties of the suspension.
Implicit constraint handling for shape optimisation with POD-morphing
Authors: Raghavan Balaji , Xiao Manyu , Breitkopf Piotr , Villon Pierre
Published: July 2021

In the former paper, we have introduced an original morphing approach based on Proper Orthogonal Decomposition (POD) of shapes, designed to replace parametrized CAD models in structural optimization. Here, we expand the method to interpolate exclusively between admissible instances of structural shapes, thus permitting a global understanding of the design domain and also reducing the size of the optimisation problem. The result is a bilevel reparametrization approach for structural geometries based on Diffuse Approximation in a properly chosen locally linearized space, and the geometric parameters are replaced with the smallest set of variables needed to represent a manifold of admissible shapes for a chosen precision. We demonstrate the approach in a typical shape optimisation problem.
A Newton–Krylov method for solid mechanics
Authors: Tardieu N. , Cheignon E.
Published: July 2021

In this article a Newton–Krylov method is discussed, which is part of the inexact Newton’s methods family. They combine iterative solution methods, especially Krylov methods (conjugate gradient, GMRES, etc.) with the Newton’s method, whereas, in solid mechanics, direct solvers are often preferred for the solution of linearised systems. After having introduced a versatile and robust preconditioner, we discuss the efficiency of this approach on a highly non-linear industrial problem.
On a hybrid Laplace-time domain approach to dynamic interaction problems
Authors: Ferro A. Nieto , Clouteau D. , Greffet N. , Devésa G.
Published: July 2021

Dynamic interaction problems between two subdomains lead in time to convolution integrals on the interface when one (linear) subdomain is modelled by an impedance operator and the other exhibits non-linear behaviour. In the present work, a convolution quadrature method is used to address a Laplace transform-based approach to evaluate these convolution products. Its properties are discussed on some numerical soil–structure interaction applications: one that is fully linear and the other showing material non-linearities.
A new solution technique for cathodic protection systems with homogeneous region by the boundary element method
Authors: Santos W. J. , Brasil S. L. D. C. , Santiago J. A. F. , Telles J. C. F.
Published: July 2021

The purpose of this work is to efficiently evaluate the design of cathodic protection (CP) systems of tank bottoms using concentric ring or linear anodes. As customary in current CP systems, the outer surface of the tank bottom is usually in electrical contact with a slender homogeneous layer of conductive concrete (or something similar) which in turn is in direct contact with the homogeneous deep soil region. The boundary element method (BEM) together with a subregion technique has been widely adopted to analyse such CP systems where the domain consists of two (or even more) homogeneous zones. However, the numerical solution of the final matrix system of equations can be quite time-consuming, especially if the slender intermediate layer is to be discretised, requiring a considerable number of elements, due to its somewhat reduced thickness. To overcome this problem, the present work proposes a new methodology in which the slender subregion is indirectly introduced, as a theoretically created polarisation curve, acting as a new boundary condition at the boundary of the soil domain (original common interface). Numerical simulations have been carried out using BEM implementations and results are discussed, including CP studies of practical axisymmetric and three-dimensional engineering problems.
EAS 3D triangular and quadrangular shell elements
Authors: Jetteur Philippe , Pasquet Philippe
Published: July 2021

A new 3D solid shell element is developed in SAMCEF™ code. The purpose of this element is to make the meshing easier starting from a 3D definition of the structure, it is not necessary to extract the mean surface of the shell. Here, we are not concerned by the meshing; we only are concerned by the element formulation. In order to improve the quality of the results, we add internal degrees of freedom as suggested by Simo and co-authors. We use the Enhanced Assumed Strain method. A special handling of the transverse shear is performed in order to pass successfully the plate patch test (constant bending) and to avoid shear locking. The formulation is based on the work of Bathe and Dvorkin for classical shell. The element has been developed in linear and non-linear analysis; it can be a mono or multilayer element.
Modeling of random anisotropic elastic media and impact on wave propagation
Authors: Ta Quang-Anh , Clouteau Didier , Cottereau Régis Cottereau
Published: July 2021

The class of stochastic non-gaussian positive-definite fields with minimal parameterization proposed by Soize (Soize, 2006) to model the elasticity tensor field of a random anisotropic material shows an anisotropy index which grows with the fluctuation level. This property is in contradiction with experimental results in geophysics where the anisotropy index remains limited whatever the fluctuation level. Hence, the main purpose of this paper is to generalize the Soize’s model in order to account independently for the anisotropy index and the fluctuation level. It is then shown that this new model leads to major differences in the wave propagation regimes.
Fluid-structure interaction with a multiscale domain decomposition method
Authors: Vergnault Etienne , Allix Olivier , Maison-le-Poëc Serge
Published: July 2021

In order to solve structural problems submitted to a fluid-induced loading, we are interested in solving a fluid-structure interaction problem involving a deforming solid and a viscous fluid, under incompressible flow. We propose to use a partitioned but strongly coupled Gauss-Seidel scheme. We propose to solve the fluid part of the simulation by a finite element method with a scalable mixed domain decomposition strategy. A fictitious domain method enables taking into account the fluid-structure interface inside each fluid subdomain. Here, we describe the domain decomposition method and the coupling process on a stationary problem.
Multiple resonance capture of a compound system under harmonic excitation
Authors: Pham Thanh Tung , Lamarque Claude-Henri , Savadkoohi Alireza Ture , Pernot Stéphane
Published: July 2021

Vibration exchange between a master linear oscillator and a slave Nonlinear Energy Sink (NES) under harmonics excitation by means of several resonance capture is investigated and commented upon. The importance of higher frequencies by introducing the concept of the relative mode is pinpointed. A fast and special iterative technique and then the more general form of it is introduced in order to evaluate the system unknowns. Finally, the effect of the correct resonance paring on detecting the actual system behavior is illustrated by an example.
Interaction véhicule-voie-sol et vibrations dues aux trains
Authors: Auersch Lutz , Maldonado Marc
Published: July 2021

This contribution presents models that are necessary to calculate the vibrations due to the passage of a train. The models allow to calculate the propagation of the waves and the receptances of the soil and the track. The layered soil and the coupling with the track are treated by a (double) integration in wavenumber domain. The dynamic stiffnesses of the track and vehicle are combined and the excitation forces due to the irregularities of the track and the wheel are calculated. Finally, these excitation forces are used to simulate the ground vibration of a passing train. All these models are validated by a number of different measurements at two sites in France and Germany.
A robust data completion method for two dimensional Cauchy problems associated with the Laplace equation
Authors: Delvare Franck , Cimetière Alain
Published: July 2021

Our aim is to propose an improved regularization method for data completion problems. This method is presented on the Cauchy problem for the Laplace equation in 2D situations. This method is an iterative one, uses a regularization with fading effect and penalization terms which take into account the fact that, under some regularity assumptions, the partial derivatives of a harmonic function is also harmonic. Many numerical simulations using the finite element method highlight the efficiency, accuracy, stability when data are noisy and the ability of the method to take into account and deblur noisy data.
Passive and active acoustic properties of a diaphragm at low Mach number
Authors: Trabelsi Hassen , Zerbib Nicolas , Ville Jean-Michel , Foucart Félix
Published: July 2021

In this paper a low noise flow duct facility that performs a multimodal characterization of the passive and active acoustic properties of obstacles in the aero-acoustic conditions of an automotive air conditioning system is presented. The experimental procedure is made of two steps. In the first one the passive data, i.e. the multimodal scattering matrix, is measured with a multi-sources method. In the second step the outgoing modal pressure spectra radiated upstream and downstream by the flow obstacle interaction source is achieved. A numerical simulation of the experiment based on a 3D-Finite Element Method is developed. A very good agreement between the theoretical and experimental results of the no flow scattering matrix of a diaphragm is found. The effect of the flow on the scattering matrix is shown before performing the measurement of the aero-acoustic source characteristics of the diaphragm.
Improving research impact: lessons from the infrastructure engagement excellence standards
Authors: Jones Kirsty , Bice Sara
Published: July 2021

Background:

The gap between research and practical implementation remains a major challenge for policymakers. Research co-creation, involving researchers co-designing and co-producing research with industry, government and civil society, can support improved end user uptake and better research implementation.

Aims and objectives:

This Practice Paper introduces a process of research co-creation based in implementation science and integrated knowledge translation theories. It details the development of the Infrastructure Engagement Excellence Standards (IEE), a framework of 10 Standards defining the qualities of community engagement for optimal infrastructure planning and delivery. The paper details a research co-creation process applicable across a variety of industries and policy settings.

Key conclusions:

The Practice Paper introduces a theory-based method for research co-production and discusses strengths and weaknesses of the co-creation approach used to develop the IEE Standards. Implementation science and integrated knowledge translation theory offer important insights to support more successful research co-design and co-production. Research that incorporates these theories is better positioned to achieve implementation. The creation of the IEE Standards offers one helpful example of how researchers, policymakers and practitioners can begin to close the research-implementation gap.
Seasonal bias in global ocean color observations
Authors: Bisson K. M. , Boss E. , Werdell P. J. , Ibrahim A. , Frouin R. , Behrenfeld M. J.
Published: July 2021

In this study, we identify a seasonal bias in the ocean color
satellite-derived remote sensing reflectances (

R

r
s

(
λ
)
;

s
r

−
1

) at the ocean color validation site,
Marine Optical BuoY. The seasonal bias in

R

r
s

(
λ
)

is present to varying degrees in all
ocean color satellites examined, including the Visible Infrared
Imaging Radiometer Suite, Sea-Viewing Wide Field-of-View Sensor, and
Moderate Resolution Imaging Spectrometer. The relative bias in

R

r
s

has spectral dependence. Products
derived from

R

r
s

(
λ
)

are affected by the bias to varying
degrees, with particulate backscattering varying up to 50% over a
year, chlorophyll varying up to 25% over a year, and absorption from
phytoplankton or dissolved material varying by up to 15%. The
propagation of

R

r
s

(
λ
)

bias into derived products is
broadly confirmed on regional and global scales using Argo floats and
data from the cloud-aerosol lidar with orthogonal polarization
instrument aboard the cloud-aerosol lidar and infrared pathfinder
satellite. The artifactual seasonality in ocean color is prominent in
areas of low biomass (i.e., subtropical gyres) and is not easily
discerned in areas of high biomass. While we have eliminated several
candidates that could cause the biases in

R

r
s

(
λ
)

, there are still outstanding
questions regarding potential contributions from atmospheric
corrections. Specifically, we provide evidence that the aquatic
bidirectional reflectance distribution function may in part cause the
observed seasonal bias, but this does not preclude an additional
effect of the aerosol estimation. Our investigation highlights the
contributions that atmospheric correction schemes can make in
introducing biases in

R

r
s

(
λ
)

, and we recommend more simulations
to discern these influence

R

r
s

(
λ
)

biases. Community efforts are needed
to find the root cause of the seasonal bias because all past, present,
and future data are, or will be, affected until a solution
is implemented.
Monitoring adaptation of skin tissue oxygenation during cycling ergometer exercise by frequency-domain diffuse optical spectroscopy
Authors: Tseng Sheng-Hao , Liang Bo-Jian , Wang Wen , Tsai Bo-Xiang , Hu Po-Sheng
Published: July 2021

In addition to supplying oxygen molecule O2 for metabolic functions during the adaptation to exercise, blood also plays a critical role in heat dissipation for core temperature stabilization. This study investigates the status of hemodynamic oxygenation in the forearm’s skin tissue of three participants during a complete ergometer exercise from the resting to exercising, and to recovering conditions using a three-wavelength frequency-domain diffuse reflectance spectroscopy (FD DRS) alongside the monitoring of heartbeat rate and skin temperature. The FD DRS system was synchronized with radiofrequency (RF)-modulated input photon sources and the respective output to extract time-course absorption and scattering coefficients of the skin tissue, which, through the fitting of lambert’s law of absorbance, can be used to determine the concentration of oxygenated/deoxygenated hemoglobin molecules, and consequentially, the oxygen saturation of skin tissue and total hemoglobin (THb) concentration. Expressly, a sudden jump in heartbeat rate at the beginning of the exercise, a temporal lag of the rising edge of skin temperature behind that of the THb concentration in the procession of step-wise incremental working intensity, and the uprising of THb in the exhaustion zone in responses to the physiological adaptation to exercise were identified. Finally, conclusive remarks were drawn that the FD DRS system is useful in extracting the hemodynamic properties of forearm skin which is often being neglected in previous exercise physiology studies by DRS-related techniques. The detailed variation of hemodynamic and optical scattering parameters of forearm skin elucidated in the studies can be applied for the analysis of athletes’ physiological status, and may be a potential reference for the design of future wearable devices.
Numerical studies of the operating regimes of a passively mode-locked Thulium doped fiber laser
Authors: P S Anjali , Srivastava Manas , Srinivasan Balaji , Venkitesh Deepa
Published: July 2021

The design of a stable and reliable passively mode-locked laser cavity with Thulium doped fiber is a challenge especially due to its large saturation power owing to a shorter metastable lifetime. In this work, we investigate the influence of various cavity parameters on the stable mode-locked operation of a semiconductor saturable absorber mirror (SESAM) based passively mode-locked Thulium doped fiber laser through numerical modelling. Specifically, we present a detailed study on the effect of the repetition rate, modulation depth, saturation fluence, and damage threshold of the saturable absorber, quality factor of the laser cavity, bandwidth of the passive reflector, and gain medium characteristics on stable operation of a passively mode-locked fiber laser. Experimental results are also presented to validate the key aspects of the simulation.
Screening of biocontrol bacteria against soft rot disease of Colocasia esculenta (L.) schott and its field application
Authors: Dong Xiaofei , Fang Lu , Ye Zuyun , Zhu Guangqiang , Lai Qianyu , Liu Shengrong
Published: July 2021

Soft rot disease is a major pathogenic bacteria of Fuding areca taro and has caused serious losses. This study aims to screen biocontrol bacterial against soft rot disease. A total of 53 bacterial strains were isolated from the rhizosphere soil, nine of which exhibited good biocontrol effect against the pathogenic bacteria of soft rot disease as seen in antagonistic screening of biocontrol bacteria from corm in vitro. Strains were selected by physical and chemical experiments, biocontrol effect tests in vivo, molecular sequencing, morphological observation and field tests. Four strains including CAB-L005, CAB-L012, CAB-L014, and CAB-L022 exhibited strong antagonistic effects. On the basis of the sequence homology of 16S rRNA genes, the similarity between strain CAB-L005 and Bacillus tropicus was 100%, that between strain CAB-L012 and Bacillus subtilis was 99%, and that between strain CAB-L014 and Bacillus tequilensis was 100%, and similarity between strain CAB-L022 and Bacillus cereus was 100%. The isolated bacteria demonstrated good biocontrol effects in field experiments. In this study, four strains with good biocontrol application value were isolated and identified, providing a foundation for biocontrol against soft rot disease in areca taro.
Evaluation of a community-based HIV test and start program in a conflict affected rural area of Yambio County, South Sudan
Authors: Ferreyra Cecilia , Moretó-Planas Laura , Wagbo Temessadouno Fara , Alonso Beatriz , Tut Buai , Achut Victoria , Eltom Mohamed , Aderie Endashaw M. , Descalzo-Jorro Vicente
Published: July 2021

Background

Antiretroviral therapy (ART) coverage in South Sudan is around 10%. Access to HIV care in settings with low ART coverage or conflict affected is still low; innovative strategies are needed to increase access and ensure continuation of ART during instability. A pilot HIV test and start project was implemented in a conflict-affected area of South Sudan. In a retrospective analysis, we determined the feasibility and outcomes of this intervention.

Methods

Programme data from July 2015 to June 2018 was analysed. The project involved five mobile teams offering HIV counselling and testing (HCT) and same day ART initiation at community level. Baseline and follow-up information on clinical, immunological and viral load (VL) was routinely recorded, as well as treatment outcomes. A semi-qualitative study was conducted to assess acceptability of the program among beneficiaries and community members.

Results

By June 2018, 14824 people received counselling and testing for HIV and 498 (3.4%) tested positive. Out of those 395 (79.3%) started ART. A total of 72 ART patients were organized in 26 Community ART Groups (CAGs) and contingency plan was activated 9 times for 101 patients. Kaplan-Meier estimated retention in care (RIC) at 12 and 18 months was 80.6% [95% CI: 75.9–84.5%] and 69.9% [95% CI: 64.4–74.8%] respectively. RIC was significantly higher at 18 months in patients under community ART groups (CAGs) (90.9% versus 63.4% p<0.001) when compared to patients on regular follow up. VL suppression at 12 months was 90.3% and overall virological suppression reached 91.2%. A total of 279 persons were interviewed about the MSF program perception and acceptance: 98% had heard about the programme and 84% found it beneficial for the community, 98% accepted to be tested and only 4% found disadvantages to the programme.

Conclusions

Our study shows that HCT and early ART initiation in conflict affected populations can be provided with good program outcomes. RIC and virological suppression are comparable with facility-based HIV programs and to those in stable contexts. This model could be extrapolated to other similar contexts with low access to ART and where security situation is a concern.
António Sérgio: um dissidente em constante busca de sentido
Authors: Matos Sérgio Campos
Published: July 2021

No pensamento de António Sérgio a memória individual ocupa aparentemente um lugar insignificante. No contexto de uma obra tão variada tudo parece obedecer a um ideal racionalista unitário de coerência íntima, a um impulso para a cidadania e expectativa de futuro melhor – o que se compreende se atendermos à intencionalidade de progresso, à marca libertária e à sede de absoluto que percorre o seu ideário. No entanto, a releitura de passagens autobiográficas esquecidas – modo de se observar a si mesmo e de se confrontar com o seu segredo íntimo – revela um complexo auto-retrato em que se torna evidente a necessidade de autojustificar o apelo de acção, a par de uma dimensão que durante muito tempo lhe foi negada: a marca romântica e mística de um dissidente das elites políticas e intelectuais do seu tempo, relativamente a uma mentalidade dominada pela dimensão material da vida e pela superstição do poder.
Rhetoric of Corporality: Representation and Apprehension of Bodies in Aristophanes' Plutus
Authors: Fernandez Claudia
Published: July 2021

En Pluto, la última comedia conservada de Aristófanes, los cuerpos ocupan el primer plano: están sustancialmente integrados al desenvolvimiento de la trama. El cuerpo ciego del dios de la riqueza, por ejemplo, es la causa de los males que aquejan a Atenas (los únicos ricos son los perversos) y también la solución del problema (a través de la curación de ese cuerpo enfermo). Este trabajo se propone ahondar en los modos, usos y regulaciones de la representación y aprehensión de los cuerpos en esta comedia, esencialmente en lo que respecta a la amenaza que significan la enfermedad y la vejez en ellos, así como explorar las experiencias sensoriales y afectivas que transitan en la relación con el mundo que los rodea.
Blockchain para periodistas y medios de comunicación
Authors: Luco-Rojas Nicolás
Published: July 2021

Reseña del libro Blockchain para periodistas y medios de comunicación.
Un manual básico para administrar empresas publicitarias
Authors: Ramos-Serrano Marina
Published: July 2021

Este libro no sólo es un manual básico  para enseñar a gestionar y administrar empresas de publicidad, sino que también es al mismo tiempo, una guía práctica para emprendedores y profesionales del sector publicitario.
Rancang Bangun Aplikasi Tele-Kendali Komputer Via Jaringan PSTN dengan Modul DTMF dan Mikrokontroller Attiny2313
Authors: Erdani Yuliardi , Rudiansyah Hendy
Published: July 2021

Extremely long distance control, hardly reachable actuator/target and costly network development  are some concerns within a distance control system. Such control is computer control for advertisements placed in tricky areas as locations over the bridge, at a junction, etc. The provider usually performs system inactivation in order to save energy. But until now, it is still difficult to find a system that can be turned on and off in remote manner. That is why the distant control using telephone can be the best alternative solution. Not only can the telephone be used in wide range of area, but also easily operated. The developed circuit in this research uses dual tone multiple frequency (DTMF). It is operated by pressing telephone button as control input for microcontroller. The microcontroller processes the input and controls the computer via relay and serial port. The result of experiment shows that the developed application is able to shut down and turn on computer as well as to apply software remotely.
Solo-paisagem no “Pico do Jabre (PB)
Authors: Marques Ailson De Lima , Sousa Gabryelle De Farias , Moura Debora Coelho , Macedo Rodrigo Santana , Costa Cássio Ricardo Gonçalves da
Published: July 2021

O Pico do Jabre é um patrimônio natural e cultural com alto potencial turístico para o desenvolvimento socioeconômico da região imediata de Patos e embora seja considerado uma das mais importantes áreas de preservação do estado da Paraíba, os trabalhos sobre suas características geomorfológicas e pedológicas dispostos na literatura não contemplam uma abordagem holística que possa reportar uma compreensão de parte da gênese de sua paisagem. Este estudo realizou a caracterização do solo-paisagem do Parque Estadual Pico do Jabre-PB. Para realização desta pesquisa foram utilizadas técnicas de cartografia geomorfológica com extração de dados morfométricos a partir de dados de elevação do sistema TOPODATA, interpretação morfológica com base na taxonomia do relevo proposta por Ross e observação foto-geológica. Levou-se em consideração o limite da Unidade de Conservação Pico do Jabre, e com base neste, criou-se um buffer de 10 km. Com base na hipsometria, declividade, relevo sombreado, perfis topográficos, rede de drenagem, Modelo Digital de Elevação e dados da CPRM, foi realizado o mapeamento do relevo. Além disso, os solos representativos e a descrição morfológica foram utilizadas para compreender a interação solo-paisagem. Os resultados obtidos mostraram que a área de estudo apresenta vertentes adaptadas a linhas de falhas. Com base na distribuição dos solos identificados na topossequência, foi constatado que os mesmos estão em catena, numa mesma superfície geomórfica, o que ressalta processos pedogenéticos associados. Os solos foram classificados como Organossolo Fólico, Neossolo Litólico, Neossolo Regolítico, Argissolo Vermelho-Amarelo, e o Neossolo Regolítico.
Planetar denken
Authors: Hanusch Frederic , Leggewie Claus , Meyer Erik
Published: July 2021

Planetar denken heißt, die Erde als Planeten ernst nehmen: vom Erdkern bis in den interplanetaren Raum, von der Nanosekunde bis zur Tiefenzeit, vom Elementarteilchen bis zur Erdmasse. Stehen Wechselwirkungen zwischen unserem Heimatplaneten und uns im Zentrum, nimmt ein planetares Wissensparadigma Gestalt an. Es geht einher mit der Relationierung menschlicher Existenz im Universum und der Relativierung der anthropozentrischen Sichtweise. So rücken Fragen der Bewohnbarkeit und Gastfreundschaft in den Vordergrund - und die Schaffung neuen Wissens bedeutet stets auch die Schaffung neuer Welten. Dieses Buch spricht alle mit dem Universum und dem Menschen befassten Wissenschaften an.
Europaentwürfe - Positionierungen der rumänischen Literatur nach 1989
Authors: Bacali Miruna
Published: July 2021

Die postkommunistische Literatur Rumäniens wirft entscheidende Fragen der europäischen Zugehörigkeit, der gesellschaftlichen Transformation sowie der Selbst- und Fremdverortung in transnationaler Perspektive auf. Miruna Bacali präsentiert einen innovativen Umgang mit den literarischen Quellentexten, die im Sinne der Geschichtswissenschaft analysiert werden. Sie werden so zu Material für gesellschaftspolitisch relevante Diskurse, die weit über das Literarische hinausgehen. Auch bindet die Fallstudie soziologische, kultur- und literaturwissenschaftliche Theorieansätze mit ein, wodurch Transfer und Vergleichbarkeit über Disziplingrenzen hinaus gewährleistet werden.
INTENSI KELUAR KERJA DITINJAU DARI THEORY OF PLANNED BEHAVIOR
Authors: Titiani Skolastika Meta Wedika , Rostiana Rostiana
Published: July 2021

This study aimed to explore the formation process of employees’ intentions to leave viewed by Planned Behavior Theory during the Covid-19 Pandemic and to determine the factors that influence the formation of employees’ intentions to leave. The intention to leave work is how much encouragement an employee has to leave the company. Based on theory of planned behavior, intention was formed by indirect belief factor and direct belief factor. The components of indirect belief were behavioral belief, normative belief, and control belief. The components of direct belief were attitudes toward behavior, subjective norms, and perceived behavioral control. The research method used was mixed method design. This research consisted of 2 stages research. First study (study 1) aimed to determine the subject's understanding toward components of indirect belief that contributed to form intention. Second study (study 2) aimed to test the measurement model through Confirmatory Factor Analysis (CFA) and structural model theory of planned behavior in the form of a Goodness of Fit test. The measurement used was the ‘Lisrel’ program. The results showed that work leave intentions were influenced by attitudes toward behavior, subjective norms and behavior control. The dominant predictor of intention to leave was subjective norms. Penelitian ini bertujuan untuk mengetahui proses terbentuknya intensi keluar kerja ditinjau dari theory of planned behavior di masa pandemi Covid-19 dan mengetahui faktor yang mempengaruhi intensi karyawan keluar kerja. Intensi keluar kerja adalah dorongan yang dimiliki seseorang untuk keluar dari perusahaan. Menurut theory of planned behavior, intensi dipengaruhi oleh faktor keyakinan tidak langsung dan faktor keyakinan langsung. Komponen dalam keyakinan tidak langsung meliputi: keyakinan perilaku, keyakinan normatif, dan keyakinan kontrol. Komponen dalam keyakinan langsung meliputi: sikap terhadap perilaku, norma subjektif, dan kontrol perilaku. Metode penelitian yang digunakan adalah metode campuran. Penelitian ini terdiri dari 2 tahap. Tahap pertama (studi 1) bertujuan untuk menggali komponen-komponen pada keyakinan tidak langsung yang berperan dalam pembentukan intensi. Tahap kedua (studi 2) bertujuan untuk menguji model pengukuran melalui Confirmatory Factor Analysis (CFA) dan uji model struktural theory of planned behavior berupa uji kecocokan model (Goodness of Fit). Pengukuran yang digunakan menggunakan program Lisrel. Hasil penelitian menunjukkan bahwa intensi kerja dipengaruhi oleh sikap terhadap perilaku, norma subjektif dan kontrol perilaku. Faktor yang paling dominan dalam mempengaruhi intensi keluar kerja adalah norma subjektif.
Ética do Slow Cinema: Lentidão e hesitação no cinema contemporâneo
Authors: Brandão Pinto Eduardo
Published: July 2021

Recentemente, teóricos e críticos cinematográficos observaram o aparecimento, nas últimas três décadas, de um  “cinema de lentidão”. O conceito de Slow Cinema é recuperado neste artigo, buscando possíveis conexões históricas e culturais com outras experiências de desaceleração do tempo. Categorias como  flâneur (Benjamin), o blasé (Simmel) e o pensamento sobre a hesitação, na filosofia de Bergson, já apontavam para a descompressão da duração do intervalo entre estímulo e resposta. O conceito de imagem-tempo (Deleuze) auxilia-nos a explorar o surgimento de uma ética da lentidão no cinema moderno. Por fim, analisando filmes de Wim Wenders, Abbas Kiarostami e Cristi Puiu, sugerimos que o Slow Cinema investe numa temporalização das passagens de causa e efeito como modo de produção de uma situação favorável à reconexão entre sujeito e mundo.
El Cine como una Educación Social de los Sentidos
Authors: Ramé Jesús
Published: July 2021

Reseña sobre el libro de Sérgio Dias Branco O trabalho das imagens. Estudos sobre cinema e marxismo. Desde el estudio de las ideas y las prácticas, el autor explica la relación entre el pensamiento de Marx y el cine. El marxismo visto como una herramienta para el análisis fílmico.
New Directions for 21st-century Portuguese Cinema
Authors: Owen Hilary
Published: July 2021

Book review of Reframing Portuguese Cinema in the 21st Century. Volume 1, published in 2020 by Agência da Curta Metragem.
Editorial V8n2
Authors: Editorial Conselho
Published: July 2021

Editorial do número 2 do volume 8 da Aniki: Revista Portuguesa da Imagem em Movimento.
Die Bewältigung der Corona-Pandemie durch das Team der Hochschulbibliothek Ludwigshafen/Rhein
Authors: Oh Guido , Haß Torsten
Published: July 2021

Die coronabedingten Erlebnisse und Vorgänge in der Hochschulbibliothek Ludwigshafen waren eine nie dagewesene Ausnahmesituation für alle Beteiligten. Die Herausforderungen für einen reibungslosen und vor allem sicheren Ablauf vor und hinter den Kulissen stellten das Bibliotheksteam vor großen Herausforderungen, die letztlich souverän gemeistert und seitens der Hochschulleitung und der Studierendenschaft anerkennend gewürdigt wurde. Dieser Bericht versucht mit Stand 29.04.2021 Verlauf und Entwicklungen der Corona-Situation chronologisch einzuordnen und einen Einblick zu geben in die Ereignisse und Problemstellungen im Betrieb, im Alltagsgeschäft und im Homeoffice.
Preparation of cypress (Cupressus sempervirens L.) essential oil loaded poly(lactic acid) nanofibers
Authors: Argui Hayfa , Suner Salih Can , Periz Çağdaş Deniz , Ulusoy Seyhan , Türker Gülen , Ben-Attia Mossadok , Büyükkaya Fikret , Oral Ayhan , Coşkun Yalçın , Said Hechmi
Published: July 2021

This study investigated the production of poly(lactic acid) (PLA) nanofibers containing cypress (CUP) essential oil (EO) via electrospinning. The nanofibers were produced from polymer solution prepared with different percentages of cypress EO. Cypress EO-containing PLA nanofibers were characterized and some mechanical and thermal properties were examined using thermogravimetric analysis, scanning electron microscopy, Fourier-transform infrared spectroscopy, and dynamic mechanical analysis. The thermal stability of the nanofibers was reduced depending on the percentage of the cypress EO. As the ratio of the cypress EO to polymer matrices was increased, it was observed that the glassy transition temperatures of the nanofibers decreased and their flexibility increased. The T
g value was determined to be 53.74°C for the neat PLA nanofiber, while 51.83°C for the PLA-CUP nanofiber (containing 15% cypress EO). According to the results of releasing trial, the increased amount of cypress EO resulted in less cypress EO releasing from polymer matrices. The nanofibers were observed to exhibit antibacterial activity against Escherichia coli and Staphylococcus aureus. The inhibition zone diameter of the nanofibers containing 10% cypress EO was 20 mm for S. aureus and 16 mm for E. coli, while 10 mm in the presence of Kanamycin.
Hybrid buffer and AWG based add-drop optical packet switch
Authors: Singh Preeti , Rai J. K. , Sharma Ajay K.
Published: July 2021

Optical packet switching (OPS) exhibits the ability to be utilized as a data transmission technique for next-generation. The core router/switch plays a significant role in packet routing and buffering in OPS. Arrayed waveguide grating (AWG) is realized as a promising core element for fast optical switching, with its intrinsic capacity to achieve wavelength routing of different wavelengths in parallel. This paper proposes an AWG-based add-drop optical packet switch, including a hybrid buffer, to resolve contention among packets. In a hybrid buffer, both optical and electronic buffers are used for the buffering of contending packets. AWGs are affected by crosstalk that can significantly impair system operation. The physical layer analysis is discussed in the presence of crosstalk, and the performance of the switch is evaluated in terms of bit error rate. The desired minimum input power is calculated for the switch’s correct operation for both optical buffer and electronic buffer. Finally, the packet loss probability (PLP) of the hybrid buffer is examined under various buffering conditions. Results reveal that with the increase in the optical power of the input signal, crosstalk power increases linearly for optical and electronic buffers. The increased crosstalk power is higher for electronic buffers than the optical buffer. The use of electronic memory in the hybrid buffer allows the hybrid buffer to increase its buffer size thus, reducing the PLP.
Evaluation of inter-aircraft optical wireless communication system with different modulation formats
Authors: Srivastava Saumya , Upadhyay Kamal Kishor , Shukla Narendra Kumar
Published: July 2021

In this paper, simulative evaluation of the inter-aircraft optical wireless communication system with the use of different modulation formats like return to zero (RZ), non return to zero (NRZ) and raised cosine by signal to noise ratio (SNR) and quality factor (Q-factor). Performance parameters are attenuation level, transmitting pointing error and scintillation are used to analyse the performance of the system. Including the pre- and post-amplifier configuration in the system, a link range of 100 km is achieved at an acceptable bit error rate and the performance of the system is also enhanced at a 5 Gbps data rate as compared to the earlier detection mechanism.
Twitter and the Real Academia Española: perspectives on impoliteness
Authors: Koike Dale A. , Garre León Víctor , Pérez Cejudo Gloria
Published: July 2021

This study presents first- and second-order approaches to impoliteness as found in the Twitter feed of the Real Academia Española, the official Spanish-language institution of the Hispanic world. We argue that impoliteness must be viewed from the perspective of the individual, reflecting their background experiences and knowledge, while also acknowledging norms of their communities. We collected 56 reactive tweets in threads among different users, generating dialogues of different opinions of (dis)agreement. Fourteen participant-viewers rated each user’s tweet and provided judgments and comments on the impoliteness on a 5-point scale. Our results indicate some commonalities among subgroups in terms of politeness norms (e.g., insults), but also show individual differences in terms of expectations (e.g., not doing one’s job). The results suggest the limitations of previous impoliteness frameworks, which apply mostly to face-to-face interactions. Our research points to a need to develop a framework of impoliteness to account for the complexity of the interactions in social media and consider an analysis at individual and community levels.
Internal structures and mechanical properties of magnetic gels and suspensions
Authors: Zubarev Andrey , Musikhin Anton , Chirikov Dmitry
Published: July 2021

We present results of theoretical and computer study of linear chain-like and complicated labyrinth structures in magnetic gels and suspensions as well as effect of these internal structures on macroscopic elastic properties of the composites. Our results show that at a certain threshold deformation, the structures experience a rupture which provokes a fall down of the macroscopic elastic stress, induced by the deformation. This effect is detected for both shear and tensile deformations. The results of calculations are compared with experimental data’s.
Az olvasásnépszerűsítés jó gyakorlatai a Csorba Győző Könyvtárban
Authors: Pajor Zsófia , Szeifer Csaba
Published: July 2021

A Csorba Győző Könyvtár kiemelt célja az olvasás és a könyvtárhasználat népszerűsítése Pécsett és Baranyában megszólítva minden korosztályt, 0-99 éves korig. Az utóbbi években könyvtárunk számos olyan innovációt valósított meg, amelyek segítségével a hagyományos könyvtári szerepek mellett valódi közösségi tér funkciót is betölt. Cikkünkben az intézmény elmúlt években megvalósított néhány kiemelt innovatív programját, szolgáltatását, kiadványát mutatjuk be, amelyek az Olvasásra születtem ismeretterjesztő és könyvajánló kiadványsorozat, a FilmPakk és a könyvtárbuszos szolgáltatás, a nemzetközi könyvtárbusz-találkozó és a pandémia idején létrejött szolgáltatások. A jó gyakorlatok bemutatásával célunk, hogy érzékeltessük: a könyvtár ma már sokkal több, mint a könyvek kölcsönzésére szolgáló kultúraközvetítő intézmény. Az alkalmazott újításokkal pedig hatékonyabban éri el a felhasználókat, akiket így megszólítva invitál a könyvtárba. Az írásunkban bemutatott példák, jó gyakorlatok kidolgozásában mindketten részt vettünk és a tapasztalatainkat összegezve azt is megmutatjuk, hogy egy könyvtár tevékenységeiben milyen sokszínű is tud lenni, továbbá azt, hogy a kulturális intézményeknek, jelen esetben a könyvtárnak a folyamatos fejlődéshez figyelemmel kell kísérni a változó társadalmi-gazdasági környezetet is. Hiszen utóbbival az olvasói igények is változnak, ehhez pedig alkalmazkodni kell.
Tanulás, utazás, boldogság - Az iskolai végzettség és az utazás életminőségre és szubjektív boldogságérzetre gyakorolt hatásának összefüggései
Authors: Gonda Tibor
Published: July 2021

2018. április-májusában 1085 fős online megkérdezést végeztünk abból a célból, hogy a magyar lakosság turizmussal kapcsolatos beállítódását vizsgáljuk, generációs vetületben. A megkérdezés reprezentatív a 15-74 éves magyar lakosságra nem, korcsoportok (10 éves intervallumok) és a lakóhely régiója alapján.[1] Az elemzésbe öt változót vontunk be: nem, generációk, lakóhely településtípusa, iskolai végzettség foka, jövedelmi helyzet szubjektív megítélése. Jelen tanulmány a kutatás azon eredményeit elemzi, amelyek a turizmus életminőségre gyakorolt hatásaira vonatkoznak.  Olyan fontos kérdésekre keressük a választ, hogy korunk rendkívül fontos társadalmi jelenségét, a turizmust, mennyire tekintik a fogyasztók az életminőségüket jelentősen befolyásoló tényezőnek, és milyen mértékben jelenti számukra a boldogság forrását. Az elemzés során statisztikai módszerekkel vizsgáljuk, hogy az iskolai végzettség fokához, illetve a jövedelmi helyzet szubjektív megítélése alapján a különböző fogyasztói csoportoknak az egyes kérdésekre adott válaszaiban vannak-e statisztikailag igazolható eltérések. Az eredmények hasznos információkat szolgáltatnak a turizmusmarketing és a turisztikai termékfejlesztés területén dolgozók számára.

 

[1] A kutatás az EFOP-3.6.1-16-2016-00004 „Átfogó fejlesztések a Pécsi Tudományegyetemen az intelligens szakosodás megvalósítása érdekében” c. pályázat keretében valósult meg.
Obsidian in the Upper Palaeolithic of Iberia
Authors: Zilhão João , Angelucci Diego E. , Le Bourdonnec François-Xavier , Lucena Armando , Martín-Lerma Ignacio , Martínez Susana , Matias Henrique , Villaverde Valentín , Zapata Josefina
Published: July 2021

Sourced from the Tyrrhenian Islands and exchanged over long distances, obsidian was used widely across prehistoric Western Europe. An obsidian core and bladelets from a newly discovered rockshelter site in south-eastern Spain, however, raised the possibility of an unrecognised mainland source of obsidian. EDXRF analysis of the Early Magdalenian finds from La Boja links them to a source 125km to the south-west. The artefacts were discarded during two brief activity phases at the site, indicating that obsidian procurement was integral to the technological choices of the site's users. The specificities of the technocomplex may explain the unique nature of this occurrence.
Wolfgang Tillmans’s Abstract Mediations and Other Ecologies
Authors: Yazdani Sara R.
Published: July 2021

In 2003 the German artist Wolfgang Tillmans installed a selection of his Silver works—a body of abstract, nuanced, monochromic surfaces—together with ten almost identical editions of his Arctic works, images depicting the Arctic landscapes photographed from above. The result was a grid of unframed works appearing as mundane, monochromic yet meditative surfaces that changed and moved. The reflective play between the abstract and the representational, between media, matter, and nature, suggests that Tillmans’s abstractions take photography into a lively dialogue with the affective and diagrammatic means of image production and constellating. This essay takes Silver and the way in which those pieces were installed together with the Arctic works in the paradigmatic exhibition if one thing matters, everything matters at Tate Britain in 2003, as the place of departure for a closer inspection of Tillmans’s abstract work, connecting the history of photography with artistic practices of the historical avant-garde inevitably concerned with the formal forces of colors, light, and other matter. My inquiry revolves around questions of processes and relations, or, to be more precise, how the abstract and representational images at Tate Britain were less concerned with representation or the familiar 1990s concept of indexicality, than with processes of mediations evolving between matter, bodies, technologies, and the natural world. My assertion is that the Silver and Arctic works as constellated in one of seven rooms at Tate Britain in 2003 attest to how photography provoked new understandings of materiality and ecology in the late 1990s and early 2000s, while gesturing toward a politicization of “nature” and challenges to the anthropocentric worldview.
Walking in Women’s Shoes
Authors: Ozgen-Tuncer Asli
Published: July 2021

This article traces feminist affinities across images of shoes as signifiers of women’s precarious mobilities on the screen. Inspired by Catherine Russell’s methodology of parallax historiography, it investigates compelling images of shoes in women’s activist filmmaking from two different time periods and national cinemas. The footwear of Eva from Lois Weber’s Shoes (1916) and Mona from Agnès Varda’s Sans toit ni loi (Vagabond, 1985) lends itself to reflection on practices of feminist historiography and a figurative reconfiguration of the flâneuse as a feminist historian who critically revisits knowledge of the past and of the present to set both in motion.
Biodegradation mechanism of biogas production by modified rice straw fermentation
Authors: Liu Enhai , Zhu Baozhong , Liu Shengyong , Yu Hailong , Zhang Zhiping , Zheng Huifan , Pan Jiaxin , Zhang Wenyun
Published: July 2021

Based on the literature on the degradation mechanism and the change of micro-functional groups in the fermentation process of modified rice straw, this study aimed to solve the problems of low biogas production rate and poor stability of the biogas production system. In this work, mathematical equations were developed and combined with duck dung and rice straw mixed raw material to perform a fermentation test. The molecular micro-functional group changes of cellulose, hemicellulose, and lignin were studied to obtain the optimal ratio of mixed raw materials for fermentation and to explore the optimization mechanism of its fermentation biogas production. Experimental results showed that the optimal ratio of mixed raw materials was 2.8:1, and the inclusion of a suitable amount of Mn2+(concentration of 2 mol × L-1) was able to strengthen MnP activity and improve the ability of white-rot fungi to rupture β-O-4 bonds. A modification pre-treatment via activated carbon-based solid acid was performed, and the experimental group generated 15.8% more cumulative biogas than the control group. The biogas yield reached its peak when 300 g of inoculum was added to the pre-treatment at a concentration of 30%.