bluuebunny/crossref_metadata_2025 huggingface dataset:
CORPOS DE TERRA E DE ÁGUA: POR UMA IDENTIDADE TERRENA NO AMBIENTE ESCOLAR
Authors: Schaefer Katia Bizzo
Published: January 2020

Este artigo traz a reflexão sobre relações entre seres humanos e natureza, com alguns apontamentos sobre brincadeiras com terra e com água no espaço escolar. O primeiro é a desmistificação da relação do contato da água e da terra com danos causados à saúde e à sustentabilidade do planeta. O segundo aponta a identidade terrena em relação ao brincar livre com terra e água na construção do Eu. Por fim, há considerações sobre o brincar livre com terra e água no contexto escolar. Este ensaio reafirma a importância de cuidar do corpo, como primeiro habitat, com o sentimento de pertencimento a um habitat maior, em uma dimensão planetária, reafirmando a importância do contato direto com a terra e a água como forma de potencializar os seres humanos em sua integralidade.
Phenology and potential reproduction of turi (Sesbania grandiflora) at Cibinong, Bogor, Indonesia
Authors: Syamsuwida Dida , Aam aminah
Published: January 2020

Abstract. Syamsuwida D, Aminah A. 2020. Phenology and potential reproduction of turi (Sesbania grandiflora) at Cibinong, Bogor, Indonesia. Nusantara Bioscience 12: 13-20. Turi (Sesbania grandiflora (L.) Pers.) is one of a prospectus energy woody species to be developed in establishing renewable energy base forest plantation. The development of this species cannot be separated from the basic information of its reproductive biology. The study was aimed to evaluate flowering phenology and reproductive potency of S. grandiflora so that information could be elaborated to estimate the fruit production potential produced. The research method was carried out by direct observation of samples of flowering trees. Data were analyzed descriptively. The number of tree samples observed for flower and fruit development and reproductive success of 10 trees, from each tree were observed three flowering branches distinguished from the west and east branches. The results showed that S. grandiflora did not experience generative bud dormancy so that flower initiation was thought to occur throughout the year and could flower and bear fruit throughout the year. S. grandiflora at the observation location has a flowering-fruiting development cycle of about 3-4 months which begins with the emergence of generative bud at the time of the observation in April and developed into flower shoot in the same month. Blooming flower (anthesis) in May, develop into young fruit in June. Mature fruits can be harvested in June-July. The reproductive potency of S. grandiflora was low with a value of fruit set (fruit/flower ratio) at the eastern and western branches were 19% ± 0.07 and 17%±0.06 and seed set (seed/ovule ratio) of 87% ± 0.12 and 83% ± 0.16, respectively. Reproductive success was 18% ± 0.07 for the eastern branches and 17% ± 0.05 for the western branches. Most reproductive variables of S. grandiflora did not show a significant difference between the eastern and western branches (P>0.05), except for fruit number (P<0.05).
Growth and secondary metabolites content of chloroform extract of Chlorella sp. and Chlorella sorokiniana cultured on chicken broiler waste media
Authors: Susanty Devy , Oksari Ade Ayu
Published: January 2020

Abstract. Susanty D, Oksari AA. 2020. Growth and secondary metabolites content of chloroform extract of Chlorella sp. and Chlorella sorokiniana cultured on chicken broiler waste media. Nusantara Bioscience 12: 28-32. Intensive chicken broiler farms create waste in the environment. Chicken Broiler Waste (CBW) was used as culture media for Chlorella sp. InaCC M39 and Chlorella sorokiniana InaCC M38 at various concentrations (2, 4, 6, 8, and 10%), and compared to AF6 media. The growth of Chlorella was observed every 48 hours for 10 days by counting the number of cells using a hemocytometer. The chloroform extract of Chlorella sp. and C. sorokiniana were analyzed for their phytochemical content to determine the presence of alkaloids, flavonoids, saponin, steroids, and tannin. The results showed that 2% of CBW media was the best medium for the growth of Chlorella with nitrogen (N), phosphorus (P), and potassium (K) content was 0.01% N; 0.01% P; 0.06% K respectively. The highest specific growth rate of Chlorella sp. on 2% CBW medium was on the 8th day of culture (0.8133) with cell density of 1.6 x 106 cells/mL, while the highest specific growth rate of Chlorella sorokiniana was on the 6th day (0.8907) with cell density of 2.99 x 107 cells/mL. The chloroform extract of the biomass of Chlorella sorokiniana contained steroid and saponin
Anti-stain algorithm of angular displacement based on a single image sensor
Authors: Yu Hai , Wan Qiuhua , Zhao Changhai , Lu Xinran , Sun Ying
Published: January 2020

The displacement measuring technique is prone to failure within the industrial environment due to the influence of dust, oil, and other contaminants that stain the equipment. There is urgent demand for new anti-stain techniques. In today’s image angular displacement measurement technology, the pixel array is used instead of the traditional photoelectric conversion element; this creates room for anti-stain improvement based on the image processing components. Based on a previous study on image-type angular displacement measurement technology, a single head image-type anti-stain algorithm is proposed in this paper that can remove the interference of small stains and ensure correct measurement value outputs. The influence of the stain on the calibration grating is first assessed based on the principle of image angular displacement measurement technology. An anti-stain algorithm based on the metal grating and multi-line fusion is proposed accordingly. The proposed algorithm is then tested on a circular grating with 38 mm diameter and

2

N

=

256

lines in the circle. The results show that angle measurement output accuracy can be guaranteed when the number of lines covered by the stains is less than half of the coding-bits. This work may provide a technical basis for enhancing stain resistance in high-performance displacement measurement technology.
Linear depolarization ratios of nitrate-coated mineral dust particles in haze episodes
Authors: Zhang XueHai , Duan Jinlong , Dai Congming , Wei Heli
Published: January 2020

This study reports an internal mixed particle model of dust and nitrate aerosols using the actual haze condition. We performed accurate calculations of linear depolarization ratios (LDR) of nitrate-coated mineral dust particles at three wavelengths (0.35, 0.53, and 1.06 µm) using the T-matrix method. The LDRs of the mono-disperse aerosol particles evolve differently as expressions in the Rayleigh and Mie domains. In the Rayleigh domain, the LDRs increase with the core–shell ratio and the aspect ratio and decrease when the wavelength increases. The forward and backward LDRs depend more on aspect ratio than on the core–shell ratio. In the Mie domain, the LDRs overall increase with the core–shell ratio and the aspect ratio, but there is no significant regular change. When the wavelength increases, the gradual change can be explained by the size parameter of the particles in the vicinity of the Rayleigh domain. For poly-disperse particles, the core–shell ratio mainly affects the position of the side-scattering peak, whereas aspect ratio affects the LDRs. The backscattering LDRs depend more on the variation of aspect ratio, and the core–shell ratio only affects LDRs in a small range. Furthermore, our results on the LDRs are highly promising for remote sensing of the non-spherical and inhomogeneous properties of fine aerosols compared with AERONET measurements. Our results provide a comprehensive understanding of the LDR evolution for coated non-spherical particles in a haze atmosphere. The LDRs can be used as an empirical reference for remote sensing to distinguish coated non-spherical particles.
Optical image encryption based on biometric keys and singular value decomposition
Authors: Tao Shan , Tang Chen , Shen Yuxin , Lei Zhenkun
Published: January 2020

We propose an asymmetric optical image cryptosystem based on biometric keys and singular value decomposition (SVD) in the Fresnel transform domain. In the proposed cryptosystem, the biometric keys are palmprint phase mask generated by a palmprint, a chaotic phase mask, and an amplitude truncated Fourier transform, which can provide the cryptosystem with more data security due to the uniqueness of the palmprint. Two images are first encoded into a complex function, which then is modulated by the palmprint phase mask. A Fresnel transform and then an SVD operation are performed on the modulated result. The SVD operation is used to generate private secret keys, which makes the encryption secret keys and decryption secret keys different, and thus the encryption process and decryption process are different. In addition, multiple images are encrypted into a real-valued ciphertext, making it convenient to transport and record. Numerical simulation results have demonstrated that our proposed encryption system has robustness against statistical, occlusion, noise, and chosen-plaintext attacks.
Dual-mode line-field confocal optical coherence tomography for ultrahigh-resolution vertical and horizontal section imaging of human skin in vivo
Authors: Ogien Jonas , Levecq Olivier , Azimani Hicham , Dubois Arnaud
Published: January 2020

Line-field confocal optical coherence tomography (LC-OCT) is a recently introduced technique for ultrahigh-resolution vertical section (B-scan) imaging of human skin in vivo. This work presents a new implementation of the LC-OCT technique to obtain horizontal section images (C-scans) in addition to B-scans. C-scan imaging is achieved with this dual-mode LC-OCT system using a mirror galvanometer for lateral scanning along with a piezoelectric chip for modulation of the interferometric signal. A quasi-identical spatial resolution of ∼ 1 µm is measured for both B-scans and C-scans. The images are acquired in both modes at a rate of 10 frames per second. The horizontal field of view of the C-scans is 1.2 × 0.5 mm2, identical to the vertical field of view of the B-scans. The user can switch between the two modes by clicking a button. In vivo cellular-resolution imaging of human skin is demonstrated in both B-scan and C-scan modes, with the possibility to navigate within the skin tissues in real time.
Effect of an input beam’s shape and curvature on the nonlinear effects in graded-index fibers
Authors: Ahsan Amira S. , Agrawal Govind P.
Published: January 2020

We present a general framework capable of describing the nonlinear
propagation of pulsed optical beams of arbitrary shapes and phase
fronts inside a graded-index (GRIN) fiber. The main assumption made is
that the spatial self-imaging features of the beam are not affected by
the temporal evolution of optical pulses. A propagation kernel known
from the work done in the 1970s is used to obtain a distance-dependent
nonlinear coefficient that captures all spatial effects within an
effective nonlinear Schrödinger equation. We consider three specific
beam shapes (Gaussian, circular, and square) to study the impact of
the shape, position, and curvature of optical beams on the complex
spatiotemporal dynamics specific to GRIN fibers. In particular, we
focus on the impact of an input beam’s shape on the
modulation-instability sidebands and the generation of multiple
dispersive waves when higher-order solitons form inside a GRIN fiber.
The results of our numerical analysis indicate that for beam widths
chosen to yield the same value of the effective mode area at the input
end of the fiber, the nonlinear effects are pronounced considerably
when a Gaussian beam is launched into the fiber. We also found that
even though the self-imaging period is doubled when an off-centered
Gaussian beam is launched into a GRIN fiber, it does not affect the
nonlinear evolution because the effective beam area still maintains
the same periodicity, as long as the shift in the beam’s center is not
so large that it does not remain confined to the fiber’s core.
Drive-noise tolerant optical switching inspired by composite pulses
Authors: Bulmer J. F. F. , Jones J. A. , Walmsley I. A.
Published: January 2020

Electro-optic modulators within Mach–Zehnder interferometers are a common construction for optical switches in integrated photonics. A challenge faced when operating at high switching speeds is that noise from the electronic drive signals will effect switching performance. Inspired by the Mach–Zehnder lattice switching devices of Van Campenhout et al. [Opt. Express 17(26), 23793 (2009).] and techniques from the field of Nuclear Magnetic Resonance known as composite pulses, we present switches which offer protection against drive-noise in both the on and off state of the switch for both the phase and intensity information encoded in the switched optical mode.
Long distance measurement by dynamic optical frequency comb
Authors: Xu Xinyang , Zhang Ziqiang , Zhang Haoyun , Zhao Haihan , Xia Wenze , He Mingzhao , Li Jianshuang , Zhai Jingsheng , Wu Hanzhong
Published: January 2020

In this paper, we propose a method aiming to measure the absolute distance via the slope of the inter-mode beat phase by sweeping the repetition frequency of the frequency comb. The presented approach breaks the inertial thinking of the extremely stable comb spacing, and the bulky phase-locking circuit of the repetition frequency is not required. In particular, the non-ambiguity range can be expanded to be infinite. To verify the performance of presented method, a series of distance experiments have been devised in different scenarios. Compared with the reference values, the experimental results show the differences within 25 µm at 65 m range in the laboratory, and within 100 µm at 219 m range out of the lab.
High-Q suspended optical resonators in 3C silicon carbide obtained by thermal annealing
Authors: Powell Keith , Shams-Ansari Amirhassan , Desai Smit , Austin Mitchell , Deng Jiangdong , Sinclair Neil , Lončar Marko , Yi Xiaoke
Published: January 2020

We fabricate suspended single-mode optical waveguides and ring resonators in 3C silicon carbide (SiC) that operate at telecommunication wavelength, and leverage post-fabrication thermal annealing to minimize optical propagation losses. Annealed optical resonators yield quality factors of over 41,000, which corresponds to a propagation loss of 7 dB/cm, and is a significant improvement over the 24 dB/cm in the case of the non-annealed chip. This improvement is attributed to the enhancement of SiC crystallinity and a significant reduction of waveguide surface roughness, from 2.4 nm to below 1.7 nm. The latter is attributed to surface layer oxide growth during the annealing step. We confirm that the thermo-optic coefficient, an important parameter governing high-power and temperature-dependent performance of SiC, does not vary with annealing and is comparable to that of bulk SiC. Our annealing-based approach, which is especially suitable for suspended structures, offers a straightforward way to realize high-performance 3C-SiC integrated circuits.
Effective vehicle-to-vehicle positioning method using monocular camera based on VLC
Authors: He Jing , Tang Kuang , He Jing , Shi Jin
Published: January 2020

In this paper, an effective vehicle-to-vehicle (V2V) positioning method using monocular camera based on visible light communication (VLC) is proposed and experimentally demonstrated. As we all know, one of the key impacts of the accuracy of monocular positioning is the baseline which is always unfixed. To improve the accuracy of monocular positioning, the known length of taillights is used as the fixed baseline. Moreover, Kalman filter (KF) is applied to reduce random errors and enhance positioning accuracy for the vehicle position. In addition, to verify the feasibility of the method, a controllable mobile platform is built. By varying the distance between estimating vehicle and target vehicle, and the relative speeds of the two vehicles, the performance of the proposed positioning method based on VLC is investigated. The experimental results show that it can achieve centimeter level of accuracy using the proposed vehicle-to-vehicle VLC based positioning method.
Direct 2D spatial-coherence determination using the Fourier-analysis method: multi-parameter characterization of the P04 beamline at PETRA III
Authors: Bagschik Kai , Wagner Jochen , Buß Ralph , Riepp Matthias , Philippi-Kobs André , Müller Leonard , Buck Jens , Trinter Florian , Scholz Frank , Seltmann Jörn , Hoesch Moritz , Viefhaus Jens , Grübel Gerhard , Oepen Hans Peter , Frömter Robert
Published: January 2020

We present a systematic 2D spatial-coherence analysis of the soft-X-ray beamline P04 at PETRA III for various beamline configurations. The influence of two different beam-defining apertures on the spatial coherence properties of the beam is discussed and optimal conditions for coherence-based experiments are found. A significant degradation of the spatial coherence in the vertical direction has been measured and sources of this degradation are identified and discussed. The Fourier-analysis method, which gives fast and simple access to the 2D spatial coherence function of the X-ray beam, is used for the experiment. Here, we exploit the charge scattering of a disordered nanodot sample allowing the use of arbitrary X-ray photon energies with this method.
Ultra-broadband and tunable saline water-based absorber in microwave regime
Authors: Xiong Han , Yang Fan
Published: January 2020

We present a saline water-based absorber that can offer an extremely wide bandwidth of electromagnetic absorption in the microwave frequency regime. The designed absorber is a hybrid of saline water and Poly Tetra Fluoro Ethylene (PTFE) dielectric material, which exhibits an absorption level greater than 90% across the frequency band from 1.4 to 3.3 and 4.3 to 63 GHz, with a relative absorption bandwidth as high as 180%. Meanwhile, the sensitivity of the absorption against oblique incidence is studied for both TE and TM polarizations. Additionally, the absorption performance of this saline water-based absorber could be tunable by changing the salinity and the combination of different temperatures and salinity. To explain the mechanism, interference theory is employed to investigate the designed absorber, and the theoretically calculated results are well in agreement with the simulation. This design offers an effective and feasible way to construct tunable and ultra-broadband absorber in low-cost stealth technology.
Window functions for self-consistency evaluation of optical constants
Authors: Larruquert Juan I. , Rodríguez de Marcos Luis V.
Published: January 2020

Optical-constant data of a material typically come from various sources, which may result in inconsistent data. Sum rules are tests to evaluate the self-consistency of optical constant data sets. Standard sum rules provide collective self-consistency evaluation of an optical-constant set in the full electromagnetic spectrum, but they give no information on the specific spectral range originating the inconsistency. Spectrally-resolved self-consistency information can be obtained with the use of window functions (WFs). Window functions can give more weight to the desired spectral range in the calculation of the sum rule. A previously developed WF was successfully used to evaluate self-consistency over the spectrum, but since it involves steep transition at the window edges and center, it has a trend to turn unstable in the calculation of sum-rule integrals for a fast decaying WF outside the window band. Two new WFs have been developed to reduce such instability. They use weight functions that smoothly cancel at the two window edges and center. The two new WFs use a weight function with three straight lines or with two 4-degree polynomials. The new WFs have been tested on exact optical constants with a coarse sampling, and they provide a strong instability reduction in self-consistency evaluation compared with the old WF. The new WFs have been also tested on experimental data sets of Al and Au reported in the literature, which unveils ranges of inconsistency. The large stability of the new WFs compared with the old one helps decide that the inconsistency calculated with the new WFs on experimental data must be attributed to inconsistency of the data sets, and not to poor sampling rate. A WF that has been used in the literature in the calculations of the dielectric function at imaginary energies for the thermal Casimir effect is also analyzed in terms of self-consistency when it is applied to sum rules involving optical constant at real (not imaginary) energies.
Beyond diffuse correlations: deciphering random flow in time-of-flight resolved light dynamics
Authors: Du Le V. N. , Srinivasan Vivek J.
Published: January 2020

Diffusing wave spectroscopy (DWS) and diffuse correlation spectroscopy (DCS) can assess blood flow index (BFI) of biological tissue with multiply scattered light. Though the main biological function of red blood cells (RBCs) is advection, in DWS/DCS, RBCs are assumed to undergo Brownian motion. To explain this discrepancy, we critically examine the cumulant approximation, a major assumption in DWS/DCS. We present a precise criterion for validity of the cumulant approximation, and in realistic tissue models, identify conditions that invalidate it. We show that, in physiologically relevant scenarios, the first cumulant term for random flow and second cumulant term for Brownian motion alone can cancel each other. In such circumstances, assuming pure Brownian motion of RBCs and the first cumulant approximation, a routine practice in DWS/DCS of BFI, can yield good agreement with data, but only because errors due to two incorrect assumptions cancel out. We conclude that correctly assessing random flow from scattered light dynamics requires going beyond the cumulant approximation and propose a more accurate model to do so.
Real time low-complexity adaptive channel equalization for coherent optical transmission systems
Authors: Zhang Xu , Li Xiang , Zeng Tao , Meng Lingheng , Li Jie , Luo Ming , Jiang Feng , Liu Ziqing , Yu Shaohua
Published: January 2020

In this paper, a novel low-complexity adaptive channel equalization (ACE) algorithm for digital coherent optical systems is proposed and experimentally demonstrated. We divide the conventional N-tap butterfly ACE into two N-tap polarization independent filters and a 1-tap butterfly adaptive equalization filter. The computational complexity can reduce about 40% of multiplier operations in the digital signal processing (DSP). We evaluate the effectiveness of our proposed ACE algorithm in a 10-Gb/s real-time coherent transmission platform. It is shown that our proposed ACE algorithm has similar performance as conventional ACE algorithm and better polarization tracking ability.
Contribution of the optical rectification in terahertz radiation driven by two-color laser induced plasma
Authors: Li Hang , Zhang Ying , Sun Wenfeng , Wang Xinke , Feng Shengfei , han Peng , Ye Jiasheng , Zhang Yan
Published: January 2020

In the terahertz (THz) generation driven by two-color laser pulses, the THz wave radiated from the BBO crystal as the effect of the optical rectification is always assumed to be less and negligible. In this paper, the contribution of the optical rectification in the THz radiation driven by two-color laser pulses has been determined quantitatively, by the crucial factors including BBO crystal rotation angle, the pump power of laser, and the numerical aperture of lens. The experimental and simulation results show that the above related factors have dramatically affected the intensity ratio of the THz waves from the plasma and BBO crystal. It is helpful for understanding the mechanism of THz generation from air plasma.
Passively mode-locked quantum dash laser with an aggregate 5.376 Tbit/s PAM-4 transmission capacity
Authors: Liu Guocheng , Lu Zhenguo , Liu Jiaren , Mao Youxin , Vachon Martin , Song Chunying , Barrios Pedro , Poole Philip J.
Published: January 2020

This paper presents an InAs/InP quantum dash (QD) C-band passively mode-locked laser (MLL) with a channel spacing of 34.224 GHz. By using this QD-MLL we demonstrate an aggregate 5.376 Tbit/s PAM-4 data transmission capacity both for back-to-back (B2B) and over 25-km of standard single mode fiber (SSMF). This represents the first demonstration of QD-MLL acting as error-free operation at an aggregate data transmission capacity of 5.376 Tbit/s for some filtered individual channels. This finding highlights the viability for InAs/InP QD lasers to be used as a low-cost optical source for data center networks.
Absolute phase synchronization over optical fiber
Authors: Si Hongwei , Wang Bo , Wang Fangmin , Chen Yufeng , Wang Lijun
Published: January 2020

An absolute phase synchronization method based on phase-conjugation scheme is demonstrated. A repeatable phase difference regardless of restart operation and fiber route changing between the phase standard at local site and the recovered signal at the intermediate-access node is achieved. This indicates that absolute phase synchronization to arbitrary nodes along the fiber link is feasible. At the intermediate-access node, this phase difference is highly stable with a fluctuation of ±0.014 rad over 10000s. And this phase difference shows consistency within 2% of the full cycle under different situations such as restart operation and fiber route changing.
Adaptive over-the-air RF self-interference cancellation using a signal-of-interest driven regular triangle algorithm
Authors: Zheng Lizhuo , Xiao Shilin , Liu Zhiyang , Fok Mable P. , Fang Jiafei , Yang Hang , Lu Ming , Zhang Zhiyi , Hu Weisheng
Published: January 2020

An optically-enabled radio frquency (RF) self-interference cancellation system is demonstrated for over-the-air in-band full duplex transmission, based on a signal-of-interest (SOI) driven regular triangle algorithm. Since the goal of a self-interference cancellation system is to retrieve the SOI that is masked by the in-band interference signal, using the SOI quality as the driven parameter for optimizing the self-interference cancellation performance is a natural and effective way to allow the system to adapt to changes and obtain the best cancellation performance. Since regular triangle algorithm has short iteration time, bursts of pseudo-random binary sequence would be used between real data transmission for optimizing the self-interference cancellation performance. The adaptive regular triangle algorithm optimizes the cancellation setting such that the in-band interference can be cancelled to a minimum, i.e., down to the noise floor. During the over-the-air experiment, 22 dB of cancellation depth is obtained over a 300 MHz bandwidth at 18.35 GHz without the need of digital self-interference cancellation.
FRAMEWORK FOR PROSTHESIS OPTIMIZATION AND SUBJECT SPECIFIC REHABILITATION FOR TRANSFEMORAL AMPUTEES
Authors: Sanchez-Alvarado Alberto Jose , Nováček Vít , Křen Jiří
Published: January 2020

This paper presents the development of a new framework for prosthesis optimization and subject-specific rehabilitation program for transfemoral amputees. It combines both experiments and modeling, including gait analysis, subject-specific simulation of gait and finite element modeling of residual limb and prosthesis interaction. Preliminary results demonstrate how reaction forces between the residual limb and prosthesis can be estimated and used as input data for detailed finite element analysis. Gait simulation may provide useful insight in subject-specific rehabilitation program while finite element simulation may provide feedback to prosthesis optimization with respect to various daily activities.
METHODS EVALUATING UPPER ARM AND FOREARM MOVEMENT DURING A QUIET STANCE
Authors: Volf Petr , Kutilek Patrik , Hejda Jan , Cerny Rudolf , Milerska Iva , Hana Karel
Published: January 2020

The article focuses on designing methods for quantitative assessment of the postural stability in a quiet stance by measuring segments of the appendicular skeleton, namely upper and forearms by inertial measurement units (IMU). Although an array of quantitative analysis methods assessing data of postural stability in the quiet stance exist by measuring the head and trunk movement, these methods have not been used to date to assess the behaviour of appendicular skeleton segments, namely the upper limbs. The applicability of methods assessing arm movement during the quiet stance has been verified by comparing the values of healthy subjects performing various stance tasks. The tests determined the quantitative evaluation of acceleration measured on individual anatomical axes. The quantities included: the volume of a convex polyhedron (PV), the volume of confidence ellipsoid (EV) and average velocity (AV) obtained by plotting three accelerations against each other. The most important findings in this study concern significant differences of PV and AV between dominant and non-dominant upper extremities and significant differences of EV, PV and AV between the data measured with a subject's eyes closed and open. Higher values of indicators were in the non-dominant extremities when subjects were measured with closed eyes. Interestingly, statistically significant differences between dominant and non-dominant arm movements were documented in PV and AV cases. This is due to the PV calculation being more sensitive to random deviations, i.e. the range of measured data, since the polyhedron bounds all the measured data, as opposed to the method, where the ellipse bounds only 95% of the measured data. In the case of the AV method, it is due to higher sensitivity to movements corresponding with arm tremors; the AV calculation relates not only to the range of measured data but, above all, to the intensity of data changes in the segment measured in a particular space and time interval. These conclusions demonstrate that it is possible to apply the proposed methods in the assessment of arm movement during a quiet stance since the differences between individual stance tasks and the dominant and non-dominant arms in specific cases of quiet stance have been identified. These conclusions also indicate a potentially more extensive medical application of the proposed quantitative data evaluation obtained from IMU, for example, within the rehabilitation process of injured appendicular skeleton segments. The use of cheaper IMU methods in mobile phones or watches can be of significant benefit in measuring the segmental movement of the appendicular skeleton in quiet stance.  The methods outlined in this paper have remarkable potential in the field of telemedicine.
CARTA DE CONTROLE MULTIVARIADA DE BENFORD PARA AVALIAÇÃO DE SUSPEITAS DE FRAUDE EM LANÇAMENTOS FINANCEIROS
Authors: Souza Davenilcio Luiz de , Korzenowski André Luis , Hein Nelson , Kroenke Adriana
Published: January 2020

O estudo propõe um método de monitoramento de movimentações financeiras por uma Carta de Controle multivariada com base na aplicação da Lei de Benford para detecção de suspeitas de fraude em lançamentos financeiros. O estudo foi conduzido por meio de modelagem e simulação, por técnicas matemáticas e tecnologia computacional para a solução do modelo. Foram gerados dois conjuntos de dados que concordaram entre si, onde a taxa de alarmes foi definida em Número Médio de Amostras coletadas até a detecção de sinais fora de controle (Average Run Length - ARLs) validando o método. Para a utilização das cartas em dados reais foi realizada a padronização dos valores e limites de controle. A suposição básica da proposição é de que dados de movimentações financeiras se comportam de acordo com a distribuição dos primeiros dígitos de Benford. A estatística do teste foi computada comparando o vetor de primeiros dígitos observados com o valor de referência dado pela distribuição de Benford que configura o monitoramento com parâmetros conhecidos caracterizado pela Carta de Controle X2. A performance da Carta de Controle pode ser avaliada por meio da taxa de alarmes falsos e da capacidade da carta em detectar corretamente desvios à distribuição de Benford. A aplicação do Limite de Controle padronizado obtido por simulação na Carta de Controle multivariada 2 demonstrou praticidade e facilidade de análise nas estatísticas geradas. O desenvolvimento de um modelo de aplicação da Carta de Controle multivariada traz inovação ao controle estatístico de processos aplicado à área financeira com o uso de recursos computacionais acessíveis e de fácil processamento.
TEORIA DA ATRIBUIÇÃO DE CAUSALIDADE: PERCEPÇÕES DOCENTES E DISCENTES SOBRE OS DETERMINANTES DO DESEMPENHO ACADÊMICO
Authors: Sousa Zeila Abdala de Sá , Ferreira Mônica Aparecida , Miranda Gilberto José
Published: January 2020

Tendo como base a Teoria da Atribuição de Causalidade, este estudo teve como objetivo confrontar as percepções de professores e de estudantes de Ciências Contábeis sobre a relevância dos determinantes do desempenho acadêmico. A Teoria da Atribuição não se restringe apenas a analisar como os estudantes atribuem causas ao sucesso ou ao fracasso do que já ocorreu, mas também analisa o quanto isso pode influenciar o desempenho futuro por meio das crenças enraizadas a partir das causas atribuídas. Dessa forma, foi realizado um levantamento, cuja amostra é composta de 492 professores e 573 estudantes do curso de Ciências Contábeis no Brasil. Os resultados evidenciaram que os determinantes considerados mais importantes por alunos e professores foram: a) relativos aos estudantes: motivação, esforço pessoal, quantidade de horas de estudo, frequência às aulas e conhecimento prévio; b) relativos ao docente: formação pedagógica; c) relativos às Instituições de Ensino Superior: infraestrutura. Também foi verificado que os alunos tendem a dar importância significativamente maior que os docentes às seguintes variáveis: frequência às aulas, motivação, esforço pessoal, infraestrutura das instituições, professores com dedicação exclusiva e com certificações na área contábil. Por outro lado, os docentes atribuem maior importância às variáveis: escolaridade da mãe, escolaridade do pai, desempenho anterior do aluno, ansiedade e estresse discente, tamanho da turma, processo seletivo e turno de estudo. Ou seja, as percepções de estudantes e docentes são relativamente parecidas, mas os primeiros tendem a atribuir o sucesso acadêmico predominantemente a variáveis internas a eles próprios, já os professores tendem a atribuí-lo a variáveis externas, conforme preconiza a Teoria da Atribuição de Causalidade. Esses achados podem contribuir com o processo de ensino e aprendizagem por meio da motivação discente em sala de aula.
TORNANDO-SE PROFESSOR: ANÁLISE DO PROCESSO DE CONSTRUÇÃO DA IDENTIDADE DOCENTE DOS PROFESSORES DE CONTABILIDADE
Authors: Lima João Paulo Resende de , Araujo Adriana Maria Procópio de
Published: January 2020

As discussões acerca da formação e atuação docente no ensino superior tem adotado um caráter tecnicista e impessoal tratando o docente como um mero objeto de estudo, deixando de lado dinâmicas sociais como o processo de construção de sua identidade profissional. Dessa maneira, o presente estudo tem o objetivo de compreender o processo de construção da identidade docente de professores de ciências contábeis. Foi adotada a abordagem qualitativa de pesquisa com evidências construídas por meio de entrevistas semiestruturadas com seis docentes na fase de “Estabilização” da carreira docente (quatro a seis anos) e analisadas a partir da construção de narrativas e análise temática que, alinhado com a literatura, originaram duas dimensões da identidade docente dos participantes da pesquisa: Trajetória e Docência. Acerca da Trajetória observou-se que os professores acumulam experiências profissionais e acadêmicas e guardam referências de professores que marcaram sua trajetória. Na análise da Docência foi observado que os professores experimentam situações e sentimentos negativos durante o começo da carreira, mas que vão se adaptando e aprendendo a lidar com situações diversas, construindo seus saberes experienciais. Os resultados também demonstram a necessidade de (re)pensar a inserção profissional de novos docentes, a formação acrítica e tecnicista desses, além de refletir sobre o papel que o docente tem perante as novas gerações e seus novos desafios.
GOVERNANÇA CORPORATIVA, TMT E BOOK-TAX DIFFERENCES (BTD) ANORMAIS EM EMPRESAS DE CAPITAL ABERTO LISTADAS NO BRASIL
Authors: Sant'anna Victor Souza , Brunozi Júnior Antônio Carlos
Published: January 2020

A contribuição deste estudo foi de demonstrar que as práticas de governança corporativa são atenuantes das BTD Anormais, e as características heterogêneas do TMT têm relações significativas com esses tipos de BTD em empresas brasileiras. Para tanto, considerou-se as pressuposições de práticas de assimetria informacional e vertentes comportamentais, psicológicas e sociais dos membros da administração. Essas associações são justificativas pelas idiossincrasias do alto escalão das firmas no país, bem como as reformas tributárias, mudanças contábeis, ambiente burocrático nos negócios, estrutura Code Law, e as  magnitudes das BTD Anormais. As BTD Anormais são consideradas como limitadoras para a qualidade dos lucros e a transparência, mas a governança corporativa e as heterogeneidades do TMT podem ser mecanismos para incentivar o controle e o monitoramento nas operações das empresas. Com base nisso, objetivou-se avaliar as relações entre as BTD Anormais, as práticas de governança corporativa, auditoria e tamanho do conselho de administração, e as características do TMT, sexo, idade, dualidade do CEO e a formação acadêmica, em empresas de capital aberto. Em aspectos metodológicos, foi utilizada uma amostra de 364 empresas listadas na B3, no período de 2010 a 2017. Para os dados, houve a aplicação da técnica de dados em painel, onde as variáveis de governança, TMT e de controle foram regredidas em função das BTD Anormais. Nos resultados, indicou-se que os custos de agência decorrentes da auditoria de Big4 são efetivos para as BTD Anormais, inibindo-as como consequências da manipulação dos resultados. Ademais, evidenciou-se que características pessoais, como sexo e a formação profissional, têm relações com as BTD Anormais. Percebeu-se que há um ciclo entre as BTD que são decorrentes das preferências do alto escalão (TMT) com a governança corporativa, que é consequência futura desses atos de assimetria informacional e práticas tributárias mais agressivas nas firmas.
STATE VALUE-ADDED TAX COLLECTION EFFICIENCY IN BRAZIL
Authors: Cabello Otavio Gomes , Gaio Luiz Eduardo , Rezende Amaury Jose
Published: January 2020

Brazil has one of the highest tax burdens on the value added taxes in the world, from where it derives a significant part of the tax collection from the tax system based on consumption. Brazilian tax burden on consumption vary from 7% to 29.8% of the Gross Domestic Product, with the world average in 3.88% and 7.25% (OCDE, 2012). In 2015, the state VAT (ICMS) represented 20,56% of all tax revenues collected in Brazil. The purpose of this paper is to determine the relative efficiency of Brazilian state value-added tax collection. We used a three-step Data Envelopment Analysis and Stochastic Frontier Analyses method to rank states based on the relative efficiency of their respective tax agencies. The results indicate that Brazil does not have an efficient ICMS collection, and the states have a large difference in collection efficiency. The results can contribute to states to establish management polices to improve their ICMS collection and analyze if there is a moral hazard problem in Brazil. This study can contribute to Brazilian states to establish management polices to improve their collection and fills in a gap in the public finance/tax literature.
A INFLUÊNCIA DO FEDERALISMO FISCAL SOBRE O ESTRESSE FISCAL DOS MUNICÍPIOS BRASILEIROS
Authors: Dantas Junior Amarando Francisco , Diniz Josedilton Alves , De Lima Severino Cesário
Published: January 2020

O Federalismo Fiscal permeia o elo entre a competência tributária de cada ente federado e a alocação de recursos públicos em função das demandas das comunidades locais, com consequências diretas na condição financeira e na oferta de bens e serviços públicos à sociedade que pode, ainda, sofrer influências das instabilidades econômicas, apontadas pela literatura como fator agravante das conexões fiscais entre os entes federados, contribuindo para o estresse fiscal. Diante disso, esta pesquisa objetivou verificar a influência do federalismo fiscal sobre o estresse fiscal dos municípios brasileiros. Especificamente, analisou se os municípios que eram mais dependentes das relações federalistas eram mais inclinados ao estresse fiscal. Buscou, também, controlar o efeito das instabilidades econômicas do ano anterior no estresse fiscal dos municípios sob a ótica federalista. Avaliou-se, então, o federalismo fiscal por quatro perspectivas: receita e despesa públicas, autonomia dos entes e descentralização fiscal, bem como as instabilidades econômicas pela variação real do PIB trimestral. A amostra constituiu-se de municípios brasileiros entre os anos de 2006 a 2016, representando 50.260 observações. Para a análise empírica, utilizou-se a regressão logística a partir de dados em painel. Os resultados do estudo indicaram que os municípios fiscalmente estressados sofreram influência estatisticamente positiva e significante do federalismo fiscal e dos períodos de baixo crescimento, apontando os efeitos da centralização das receitas e descentralização das despesas pregadas pelo federalismo fiscal, além da acentuação dessa relação em épocas de instabilidade econômica. Deste modo, em termos gerais, a pesquisa concluiu que quanto maior a dependência fiscal dos municípios analisados, mais predispostos esses municípios estavam ao estresse fiscal, especialmente em épocas de instabilidade econômica.
DO THE WORDS MATTER? AN ANALYSIS OF THE LINGUISTIC SENTIMENT OF EARNINGS CONFERENCE CALLS AND ABNORMAL STOCK RETURNS IN BRAZILIAN COMPANIES
Authors: Viana Junior Dante Baiardo Cavalcante , Castro Lívia Arruda , Ponte Vera Maria Rodrigues , Lima Maiara Chagas
Published: January 2020

In finance and accounting literature, different aspects are presented as possible factors related to stock returns. More recently, studies have been dedicated to analyzing the potential influence of the tone and sentiment of corporate reports, newspaper articles, press releases, and investor message boards on stock prices. Thus, based on assumptions of Legitimacy Theory, we investigate whether cumulative abnormal returns (CAR) on the stocks of Brazilian listed companies are associated with the linguistic sentiment of quarterly earnings conference calls. Using a sample of 78 observations related to the conference calls of 24 companies listed in the Novo Mercado segment in 2016-2017, we measured CAR using the market model and the linguistic sentiment of earnings conference calls using IBM’s Watson Natural Language Understanding platform. An analysis of the results of statistical tests such as descriptive results, correlation matrix, and correspondence analysis enables it to be inferred that, in general, there is a positive association between cumulative abnormal returns and the optimism sentiment of quarterly conference calls. Thus, it is conjectured the possibility that the speeches made by managers in conference calls legitimize company performance in the market, by altering the perception of investors in the stock market and leading to implications for the value of the stocks traded.
A investigação da diversidade biocultural no Norte de Minas Gerais e sua contribuição à justiça ambiental
Authors: Thé Ana Paula Glinfskoi
Published: January 2020

Este artigo foi elaborado a partir de revisão bibliográfica de estudos em antropologia, etnoecologia e sociologia ambiental realizados no Norte de Minas Gerais e de experiências de campo entre comunidades vazanteiras e pescadoras do Médio Rio São Francisco. O objetivo é discutir a importância de pesquisas para a resolução de conflitos ambientais gerados pela implantação de Unidades de Conservação de Proteção Integral em territórios tradicionais. Ao abordar o conjunto de saberes ambientais produzidos por populações tradicionais em suas interações com a natureza, as etnociências permitem compreender melhor a história ambiental humana em determinados espaços e biomas, a formação de identidades e de territorialidades. A compreensão desses processos e elementos é fundamental para apoiar a garantia a direitos humanos e territoriais, combinada a um modelo de gestão compartilhada que possibilite acesso à natureza, seu uso sustentável e preservação.
Bentuk ~You To Suru Dalam Kalimat Bahasa Jepang
Authors: Rini Elizabeth Ika Hesti Aprilia Nindia
Published: January 2020

-You to suru form has two functions, i.e. as a marker of interpersonal modality and a marker of incoative aspects. This study aims to describe the structure and meaning of -you to suru form in order to use it in the right situation. The method used in this study is agih method, and bagi unsur langsung techniques. As a result of the research, it was found that -you to suru form as a marker of intention modality stated effort in doing something; and as a marker of the incoative aspect stated  the start of an activity. As a marker of intention modality, the form of -you to suru is attached to volitional verbs; while as a marker of the incoative aspect, -you to suru form is attached to both volitional and non volitional verbs.
Implementasi Shibori Di Indonesia
Authors: Maziyah SIti , Indrahti Sri , Alamsyah Alamsyah
Published: January 2020

(Title: Shibori Implementation in Indonesia) Shibori is a technique for making batik-like cloth motifs carried out in Japan. Lately, this technique has been favored by many Indonesians because of its simpler technique and faster production than batik making. Actually this technique is similar to batik, which is doing a color barrier to create a motif on the fabric. If in batik the barrier device used is wax, then the shibori used can be from various tools such as rubber, yarn, clothespin, and so on. Based on a search on the culture of making traditional fabric motifs in Indonesia, it turns out that the shibori technique has also been carried out by fabric artisans in Indonesia. What is the implementation of shibori in Indonesia like? By using literature studies from various writings relating to making fabric motifs, finally some shibori techniques can be investigated that have been carried out by traditional fabric artisans in Indonesia.
iPad jako narzędzie edukacyjnej zmiany? Porównawcze badanie wdrożenia projektu edukacyjnego w Libii i Polsce
Authors: Kopciewicz Lucyna , Bougsiaa Hussein
Published: January 2020

This comparative small-scale (Libyan and Polish sample) qualitative study investigates two educational models of iPads’ implementation and integration with the overall pedagogical objectives in early education in Libya and Poland. The basic methodological frame was video-ethnography supplemented by semi-structured interviews with parents, teachers and children. The questions asked were designed to recognize how technology might fit within the school’s overall vision. The results indicate that each technology initiative can be potentially transformative for schools, teachers and students. The iPad as an open educational tool encourages a student-centered model of learning, whereas teachers predominantly use frontal teaching methods. Furthermore, the teachers in the two countries have considerably different perceptions and expectations regarding the role and outcome of mobile technology.
Searching of Key Problems of the Contemporary Upbringing and Education in the Czech Republic
Authors: Vališová Alena
Published: January 2020

The study tries to analyze briefly the current questions of the contemporary school system in the Czech Republic. The ongoing transformation of our school system implied specification of the basic key problems, in the socio-economical, philosophical, sociological, psychological, and pedagogical context. The respective problems are intentionally presented only with their brief characteristics, without taking a stand to them. Such a stand should be taken only after a qualified expert consideration of individual spheres of the problems mentioned.