bluuebunny/crossref_metadata_2025 huggingface dataset:
Reliability sequential compliance method for a partially observable gear system subject to vibration monitoring
Authors: Li Xin , Cai Jing , Zuo Hongfu , Chen Xi , Mao Huijie , Xu Yutong
Published: August 2017

Assumptions accompanying exponential failure models are often not met in the standard sequential probability ratio test (SPRT) of many products. However, for most of the mechanical products, Weibull distribution conforms to their life distributions better compared to other techniques. The SPRT method for Weibull life distribution is derived in this paper, which enables the implementation of reliability compliance tests for gearboxes. Using historical failure data and condition monitoring data, a life prediction model based on hidden Markov model (HMM) is established to describe the deterioration process of gearboxes, then the predicted remaining useful life (RUL) is transformed into failure data that is used in SPRT for further analysis, which can significantly save on testing time and reduce costs. Explicit expression for the distribution of RUL is derived in terms of the posterior probability that the system is in the unhealthy state. The predicted and actual values of the residual life are compared, and the average relative error is 3.90 %, which verifies the validity of the proposed residual life prediction approach. A comparison with other life prediction and SPRT methods is given to elucidate the efficacy of the proposed approach.
Research on the characteristics of dynamic behavior of basilar membrane in spiral cochlea
Authors: Tang Zhi , Shen Qiong , Xu Chang , Hou Xi , Wang Qian , Liu Zhi-hui , Li Shu-jia
Published: August 2017

This paper used PATRAN software to establish a three-dimensional spiral cochlear model according to the actual human ears, combined with NASTRAN software to conduct a harmonic response analysis on it and studied the impact of curvature on the amplitude of basilar membrane when spiral basilar membrane was excited. The computational result of the model was consistent with the experimental result reported by previous researchers, which verified the correctness of the model established by this paper. Research found the change rule of ratio of outer radius amplitude to inner radius amplitude in the longitudinal direction of basilar membrane and the change trend of the horizontal amplitude with frequency along the basilar membrane. At high frequencies, it was found that curvature had a great influence on the horizontal amplitude of basilar membrane. In the meanwhile, the structural form of spiral basilar membrane and its change trend with frequency at the position of 12 mm reflected the basilar membrane’s amplification for sound intensity. Regarding the controversial issue in the academic at present, does travelling wave exist in basilar membrane? The theory of travelling wave in basilar membrane was supported by a lot of phase accumulation and delay as shown in phase diagram.
Condition trend prediction of aero-generator based on particle swarm optimization and fuzzy integral
Authors: Cui Jianguo , Li Huihua , Yu Mingyue , Jiang Liying , Zheng Wei
Published: August 2017

In order to improve and enhance the prediction accuracy and efficiency of aero-generator running trend, grasp its running condition, and avoid accidents happening, in this paper, auto-regressive and moving average model (ARMA) and least squares support vector machine (LSSVM) which are used to predict its running trend have been optimized using particle swarm optimization (PSO) based on using features found in real aero-generator life test, which lasts a long period of time on specialized test platform and collects mass data that reflects aero-generator characteristics, to build new models of PSO-ARMA and PSO-LSSVM. And we use fuzzy integral methodology to carry out decision fusion of the predicted results of these two new models. The research shows that the prediction accuracy of PSO-ARMA and PSO-LSSVM has been much improved on that of ARMA and LSSVM, and the results of decision fusion based on fuzzy integral methodology show further substantial improvement in accuracy than each particle swarm optimized model. Conclusion can be drawn that the optimized model and the decision fusion method presented in this paper are available in aero-generator condition trend prediction and have great value of engineering application.
Non-orthogonal joint block diagonalization based on the LU or QR factorizations for convolutive blind source separation
Authors: Zhang Lei , Cao Yueyun , Yang Zichun , Weng Lei
Published: August 2017

This article addresses the problem of blind source separation, in which the source signals are most often of the convolutive mixtures, and moreover, the source signals cannot satisfy independent identical distribution generally. One kind of prevailing and representative approaches for overcoming these difficulties is joint block diagonalization (JBD) method. To improve present JBD methods, we present a class of simple Jacobi-type JBD algorithms based on the LU or QR factorizations. Using Jacobi-type matrices we can replace high dimensional minimization problems with a sequence of simple one-dimensional problems. The novel methods are more general i.e. the orthogonal, positive definite or symmetric matrices and a preliminary whitening stage is no more compulsorily required, and further, the convergence is also guaranteed. The performance of the proposed algorithms, compared with the existing state-of-the-art JBD algorithms, is evaluated with computer simulations and vibration experimental. The results of numerical examples demonstrate that the robustness and effectiveness of the two novel algorithms provide a significant improvement i.e., yield less convergence time, higher precision of convergence, better success rate of block diagonalization. And the proposed algorithms are effective in separating the vibration signals of convolutive mixtures.
Multi-objective optimization of vibration characteristics of steering systems based on GA-BP neural networks
Authors: Peng Jin-shuan
Published: August 2017

Currently, multi-objective optimization of steering systems has seldom been reported, and this paper adopted GA-BPNN algorithm to optimize the top two order frequencies of steering systems. Firstly, this paper established the multi-body dynamics model of the steering system and obtained the random road spectrum of 4 wheels through mathematical model. Results showed that random road spectrums at different wheels were not totally the same and the position and size of peak values were also different. Therefore, the road spectrum of a wheel could not be used to replace the road spectrum of all wheels in multi-body dynamics simulation model. Otherwise, computational results would have a big error. Then, vibration accelerations of the steering wheel at different positions were extracted through the multi-body dynamics model of steering system. Results showed that there were two obvious peak values on the curve of vibration acceleration, and peak frequencies were 48.6 Hz and 65.1 Hz. The finite element model of steering system was established to compute the vibration acceleration, and it was compared with the experimental result. Relative error was controlled within 5 %. It indicated that the finite element model in this paper was reliable. In addition, the computational two order modal frequencies were completely the same with the peak frequencies of vibration acceleration, which proved that the peak values of vibration acceleration were totally caused by the top two order modals. Finally, GA-BPNN algorithm was proposed to optimize the structural thickness of key parts on the steering system, and the optimized result was then compared with that of BPNN and PSO-BPNN. Results showed that the optimization efficiency and result of GA-BPNN were obviously superior to those of other algorithms in the process of optimization and iteration. The optimized parameters were reapplied to the computational model of this paper. Vibration accelerations of the steering system at many positions were extracted to compare with those of the original result. Peak frequencies were significantly improved. In addition, vibration accelerations at most frequency points of the whole frequency band were significantly improved.
A new improved Kurtogram and its application to planetary gearbox degradation feature analysis
Authors: Ni Xianglong , Zhao Jianmin , Hu Qiwei , Zhang Xinghui , Li Haiping
Published: August 2017

Because of various advantages of planetary transmission system, it has been widely used in modern industry. And study on planetary gearbox degradation feature analysis method has important significance for mechanical system prognostics and health management (PHM). In order to analysis the degradation characteristic of planetary gearbox, Energram is proposed in this paper based on Kurtogram. Kurtogram is used for finding the optimal frequency band to rotating machinery fault diagnosis by calculating kurtosis. Similarly, Energram is used to show the energy trend of each frequency band by calculating energy, and arithmetic Energram is used to show the change of frequency band energy. The principle and application of Energram and arithmetic Energram are described by experimental data examples in this paper. A detailed study of planetary gearbox degradation characteristics is expressed in case study, which including Energram, arithmetic Energram and four particular comparative analyses. And the conclusions of each comparative analysis are given.
Vibration control of vehicles with active tuned mass damper
Authors: Taskin Yener , Yuksek Ismail , Yagiz Nurkan
Published: August 2017

The purpose of this paper is to propose an alternative approach on controlling of vehicle vibrations by using active tuned mass damper. The approach is presented by simulation of a quarter-car model. Initially, a tuned mass damper is integrated on a vehicle model and its optimal parameters are determined by using 3D diagram of the maximum magnitudes of the sprung mass frequency response functions. Active control is obtained by adding an actuator element parallel to tuned mass damper. The fuzzy-sliding mode control method is utilized in reducing the displacement and acceleration magnitudes of sprung mass. Finally, comparison of active and passive responses in frequency and time domain are given to demonstrate vibration control improvement.
Structural response and optimization of airtight blast door under gas explosion load
Authors: Li Haitao , Chen Xiaokun , Wang Qiuhong , La Jiezhuoma , Deng Jun
Published: August 2017

Airtight blast door, as one of the key components of a rescue device or a ventilating device in underground coal mine, which can not only guarantee the normal operation ventilation system, but also can prevent the propagation of shock wave and invasion of toxic gases. Therefore, high structural stability and safety is fundamental when designing a door. An airtight blast door was developed and optimized based on static analysis and topological optimization, and dynamic response analysis of the optimized airtight blast door subjected to gas explosion load was conducted using a novel approach proposed in this paper-the FEM-SPH contact algorithm. Results showed that the main component weight of this kind of door is 27.4 % smaller than the original one without reducing the blast and impact behavior, the maximum displacement and stress of the optimization door obtained by FEM-SPH contact algorithm (dynamic response) are much larger than those using static mechanical analysis. The FEM-SPH contact algorithm and typical optimization method as well as the example presented in this paper are helpful for the original design and optimization of other products. Some conducive suggestions were recommended based on the simulation results.
Robust vibration control of a flexible manipulator in presence of payload uncertainty
Authors: Khushnood Muhammad Atif , Wang Xiaogang , Cui Naigang
Published: August 2017

This paper presents the results of hybrid vibration controllers applied for vibration suppression of flexible manipulator. The model of the manipulator is assumed to be uncertain due to varying payload. To cater for the model uncertainty the proposed hybrid controller combines robust input shaping for command input with μ-controller applied for active vibration suppression using smart materials. Dependence of hybrid controller performance on design frequencies of input shaper is also studied. Results showed that the performance of hybrid controller is strongly dependent on the parameters used for designing input shaper, and the effectiveness of the hybrid controller can be substantially increased by judiciously selecting the design frequencies of input shaper. Effectiveness of the proposed controller is demonstrated by comparative studies with hybrid controllers formed by robust input shaping and PPF (positive position feedback) controller. Results are compared for suppressing vibrations resulting from slewing motion of manipulator, where the slewing motion is controlled by the PD controller. Results of comparisons showed that the μ-controller gave better performance in terms of settling time and energy consumption than those using PPF.
The analytical solution of 2D electromagnetic wave equation for eddy currents in the cylindrical solid rotor structures
Authors: Ergene Lale T. , Ertuğrul Yasemin D.
Published: August 2017

The paper presents the closed-form solution of two dimensional (2D) electromagnetic wave equation for eddy current problems in cylindrical structures. The magnetic field calculation is a complex issue for electrical machines especially. The paper provides an analytical solution for solid cylindrical structures with linear magnetization. This approach is extended to the electrical machines with the solid rotors. Multilayered cylindrical geometry is used for the solution. Two dimensional parabolic partial differential equation is solved for each layer. According to the analytical solution, eddy current and eddy current losses are calculated in the solid region and compared to the results of the finite element model.
Numerical simulation and experimental research on aerodynamic noises of the single wheel landing gear in an aircraft
Authors: Zhou Yao-ming , Liu Yao-long , Li Shao-wei , Li Dao-chun , Jia Yu-hong
Published: August 2017

This paper established a computational model for the flow field of landing gear and extracted the velocity and vorticity distribution of flow field. A lot of shedding vortexes presented around the torque arm and pillar of landing gear and had the greatest impact on the flow field around the landing gear. Then, the aerodynamic noise of landing gear was measured in an anechoic chamber. The working noises of landing gear were more than background noises of landing gear. Their change trends were similar. Obvious peak frequencies presented at the front end of noise spectrum. In addition, peak frequencies increased with the increase of flow velocity. There were multiple peak frequencies on the curve of spectral characteristics. These frequencies were from pure sound in noises. Pure sound did not change with the change of flow velocity. The difference value of total sound pressure level of working noises and background noises was less than 10 dB. However, the difference value was bigger and bigger with the increase of flow velocity. When flow velocity was more than 50 m/s, background noises were over 10 dB lower than the total sound pressure level of working noises. Thus, it showed that the aerodynamic noise source of landing gear could be effectively recognized by experimental equipment. In addition, the total sound pressure level of aerodynamic noises of landing gear also increased with the increase of flow velocity and was directly proportional to the 6th power of flow velocity. The main noise source in experiments was dipole source. Finally, aerodynamic noises were obtained by AML model of landing gear, and compared with experimental results, showing consistent value and change trend. It showed that the computational model of noises was reliable. Based on the computational model of noises, this paper studied the contribution of pillar and torque arm of landing gear to radiation noises. Results showed that the pillar of landing gear was the main reason for radiation noises. In the future, pillar noises will be reduced through conducting structural design for the pillar of landing gear or applying sound package, further reducing radiation noises.
Numerical computation and improvement of aerodynamic radiation noises of pantographs
Authors: Wu Jin-mei
Published: August 2017

This paper studied the aerodynamic characteristics of cylinder and pantograph based on large eddy simulation and the acoustic boundary element method, compared sound pressure levels of different observation points and adopted measures to reduce radiation noises. Pressure distributions on the upper and lower surfaces of the cylinder were symmetrical, and radiation noises were basically the same too. Sound pressure level in the front of the cylinder was more than that on the upper and lower surfaces of the cylinder. Sound pressure level at the back of the cylinder was the maximum. With the increase of the computational time, shedding vortexes gradually developed backwards, and the influence area was bigger. The radius of radiation sound field of the cylinder was obviously reduced after applying porous materials. Additionally, contours for noise were highly symmetrical in the whole analyzed frequency band. At 2000 Hz, the cylinder presented the obvious characteristics of dipole noise source. The aerodynamic drag and lift of pantographs through numerical computation were similar to experimental results and increased with the increase of flow velocity, which showed that the computational model for the aerodynamic characteristics of pantographs in this paper was effective. Pressure was large in the area close to the pantograph head, in the connection position between upper and lower pull rods and near the base. Long dragged airflow was formed at the pantograph head, upper and lower pull rods and at the back of the base, which had a serious influence on the distribution of aerodynamic noises of pantographs. Obvious shedding vortexes were formed in the area far away from the pantograph rather than near the pantograph. The density and strength of shedding vortexes were not large. Sound pressure levels of observation points which had the same distance from the center of pantograph base were basically the same in change trend, value and peak frequency. However, the sound pressure level of observation points around the pantograph head was obviously greater than that of other observation points when the analyzed frequency was over 1000 Hz. Radiation noises in the connection position between upper and lower pull rods were greater than that of other observation points. With the increase of the analyzed frequency, the dispersive-ness of aerodynamic noises of pantographs was increasingly obvious. The radiation noise of pantographs was mainly spread along the inclined plane of 45°. When a layer of porous materials was covered on the surface of pantographs, the influence area of radiation noises was obviously reduced. In addition, the sound pressure level of radiation noises was improved.
Design and analysis of a flextensional piezoelectric actuator for incus-body driving type middle ear implant
Authors: Liu Houguang , Wang Mengli , Huang Xinsheng , Yang Jianhua , Zhou Lei
Published: August 2017

In order to decrease the power consumption of current piezoelectric stack actuator for incus-body driving type middle ear implant (MEI), a new MEI’s piezoelectric actuator with a flextensional amplifier was proposed. To aid the design process of this actuator, a human middle-ear mechanical model, which incorporated the viscoelastic properties of middle ear soft tissues, was established using finite element method. And the validation of this model was confirmed by comparing the model-predicted results with temporal bone experimental data. Then, based on this model, a coupling mechanical model of the flextensional piezoelectric actuator and the human ear was constructed and used to study the equivalent sound pressure level and power consumption of the actuator. The results show that the hearing compensation performance of the piezoelectric actuator was improved by introducing the flextensional amplifier, and the power consumption of the actuator was reduced significantly.
Numerical study on the aerodynamic noise characteristics of CRH2 high-speed trains
Authors: Yang Hang-xu , Liu Dong-mei
Published: August 2017

The aerodynamic noise of high-speed trains not only causes interior noise pollution and reduces the comfort of passengers, but also seriously affects the normal life of residents. With the increase of running speed of trains, aerodynamic noises will be more than wheel-rail noises and become the main noise source of high-speed trains. This paper established a computational model for the aerodynamic noise of a CRH2 high-speed train with 3-train formation including 3 train bodies and 6 bogies, adopted the detached eddy simulation (DES) to conduct numerical simulation for the flow field around the high-speed train, applied Ffowcs Williams-Hawkings acoustic model to conduct unsteady computation for the aerodynamic noise of high-speed trains, and analyzed the far-field aerodynamic noise characteristics of high-speed trains. Studied results showed: The main energy of the complete train was mainly within the range of 613 Hz-2500 Hz when the high-speed train ran at the speed of 350 km/h. In the whole frequency domain, it was a broadband noise. Regarding the longitudinal observation point which was 25 m away from the center line of track and 6m away from the nose tip of head train, the sound pressure level of total noises reached the maximum value 88.9 dBA. The maximum sound pressure level of the noise observation point which was 7.5 m away from the center line of track was around the first bogie of head train. Various components made different contributions to the aerodynamic noise of the complete train, and the order was head train, mid train, bogie system (6 bogies) and tail train. The first bogie of head train made the greatest contribution to bogie system and was the main aerodynamic noise source of the complete train.
Bearing fault diagnosis via kernel matrix construction based support vector machine
Authors: Wu Chenxi , Chen Tefang , Jiang Rong
Published: August 2017

A novel approach on kernel matrix construction for support vector machine (SVM) is proposed to detect rolling element bearing fault efficiently. First, multi-scale coefficient matrix is achieved by processing vibration sample signal with continuous wavelet transform (CWT). Next, singular value decomposition (SVD) is applied to calculate eigenvector from wavelet coefficient matrix as sample signal feature vector. Two kernel matrices i.e. training kernel and predicting kernel, are then constructed in a novel way, which can reveal intrinsic similarity among samples and make it feasible to solve nonlinear classification problems in a high dimensional feature space. To validate its diagnosis performance, kernel matrix construction based SVM (KMCSVM) classifier is compared with three SVM classifiers i.e. classification tree kernel based SVM (CTKSVM), linear kernel based SVM (L-SVM) and radial basis function based SVM (RBFSVM), to identify different locations and severities of bearing fault. The experimental results indicate that KMCSVM has better classification capability than other methods.
Assessing pre-adsorption time impact on ultrafiltration performance for surface water treatment
Authors: Gui Bo , Zhao Qingqing , Liu Junxia , Wang Zhihong , Chu Huaqiang , Dong Bingzhi , Bie Chujun , Jia Fan , Tian Jing
Published: August 2017

This study was to assess the effect of powdered activated carbon (PAC) pre-adsorption time on ultrafiltration performance for surface water treatment. Experimental results demonstrated that membrane fouling could be mitigated by extending the pre-adsorption time. The molecular weight (MW) distribution of water samples was determined by liquid chromatography – organic carbon detector (LC-OCD) and results showed that the mechanism of PAC controlling fouling was attributed to a decrease in the low molecular weight (LMW) fraction of raw water via extending the pre-adsorption time. Fouling indexes (FIs) were used to evaluate membrane fouling potential and the results showed that polysaccharides (PS) and proteins (PN) were greatly responsible for membrane fouling. Therefore, prolonging the PAC pre-adsorption time and decreasing the PS and PN content in raw water are the main measurement for the alleviation of membrane fouling when PAC is used as the pretreatment in waterworks.
Adaptive Organizational Communication of ASEAN from an Autopoietic Systems Perspective
Authors: Christianti Dian , Wahyuni Hermin Indah
Published: August 2017

This article focuses on ASEAN after the establishment of its community in a systems perspective. The problem elicited in this research is how the ASEAN Secretariat's adaptive communication is able to cope with challenges stemming from the establishment. To answer the question, a case study is applied, using data collection techniques including document analysis, interview, and observation. The findings reveal that ASEAN adaptive communication has allowed the association to grow rapidly to deal with difficulties. It is not, however, as ideal as a system proposed by Luhmann.
Representações de servidores da Secretaria de Justiça e Direitos Humanos (SEJUDH) acerca da formação dos agentes socioeducadores
Authors: Lima Janice Raquel , Barros Solange Maria
Published: August 2017

Este trabalho faz parte da linha de pesquisa Paradigmas de Ensino de Línguas, do Programa de Pós-Graduação em Estudos de Linguagem, da Universidade Federal de Mato Grosso. Tem por escopo desvelar as representações de servidores da Secretaria de Justiça e Direitos Humanos de Mato Grosso (SEJUDH) acerca da formação dos agentes socioeducadores, responsáveis pela educação social de adolescentes em vulnerabilidade, privados de liberdade. O referencial teórico-metodológico baseia-se nos pressupostos da Análise Crítica do Discurso (ACD), fundamentada por Norman Fairclough (2003a), no estudo das Representações de Atores Sociais, proposto por Theo Van Leeuwen (1997), e na Linguística Sistêmico-Funcional, de Halliday (1994). Os resultados das análises esclarecem as especificidades da profissão de agente socioeducador e a necessidade de investimentos na formação continuada profissional/humana para esses profissionais.
O sujeito e a socioconstrução da linguagem
Authors: Lima Francisco Renato , Carvalho Maria Angélica Freire de
Published: August 2017

Apresenta-se, neste texto, a partir de Bakhtin (2009 [1929] / 2011 [1979] / 2013 [1929]) e Vygotsky (2001 [1934] / 2008 [1934]), uma discussão sobre sujeito e linguagem, apontando para as relações intersubjetivas e dialógicas que permeiam a tessitura das interações sociais. Esses dois epistemólogos apresentam especificidades teóricas, que se delineiam e se encontram dialogicamente, ao conceberem o homem como um ser crítico e social, que age no mundo, com e por meio da linguagem. Na realização dessas ações, os sujeitos constroem uma consciência, fundada na internalização do signo, que se refracta nos contextos de usos e nas produções de sentido, que fundam e ampliam os sentidos da língua. Para a elucidação desses fundamentos, recorre-se as leituras de Bronckart (2006/2008/2012), Cardoso (2000), Fiorin (2006), Freitas (2005), Rojo (2010), que ao balizarem suas escritas nos fundamentos desses dois teóricos, entrecruzam olhares sobre a natureza sociointeracional e socio-histórica que caracteriza a ação linguageira do homem no mundo, apontando, portanto, para o papel do sujeito e a socioconstrução da linguagem.
Bilinguismo, emoções e moralidade: um estudo via sistema de avaliatividade
Authors: Pereira Igor Augusto , Praxedes Filho Pedro Henrique Lima
Published: August 2017

O artigo apresenta estudo sobre a influência do bilinguismo na moralidade de brasileiros falantes de inglês como língua estrangeira, tomando como base o conteúdo emocional em textos por eles produzidos. Investiga-se aqui se há variação entre o conteúdo emocional dos textos em língua nativa e língua estrangeira e se essa variação apresenta correlação com a natureza de posicionamentos morais, posicionamentos estes com base em conceitos da Psicologia, não na categoria ‘julgamento’ do sistema de avaliatividade. O experimento realizado nesta investigação consistiu na produção de textos escritos que justifiquem um posicionamento moral a partir de uma situação exposta em questionário de pesquisa. Para cada participante, foram apresentadas duas situações, uma em inglês, para a qual os participantes posicionaram-se e justificaram seu posicionamento em inglês, e outra em português, pedindo um posicionamento moral e sua justificativa em português. Os textos foram analisados de acordo com o aporte teórico do Sistema de Avaliatividade, como elaborado em Martin e White (2005), a partir do qual se definiram os parâmetros do que seria considerado como conteúdo emocional nos textos. A natureza dos posicionamentos tomados tem como base o conceito de Utilitarismo como apresentado em Costa et al. (2014). Identificamos nas análises que há variações no conteúdo emocional entre línguas, mas que essa variação pode não implicar determinado posicionamento moral.
O ensino do léxico no livro didático
Authors: Silva Alba Valéria Tinoco Alves
Published: August 2017

Este trabalho é resultante do encontro entre as reflexões e propostas de Irandé Antunes em Território das Palavras: o estudo do léxico em sala de aula (2012) e as minhas próprias concepções e crenças relativas ao ensino de língua portuguesa, oriundas da prática docente como professora de léxico e morfologia. Tal confluência de crenças concretizou-se em um projeto de pesquisa, intitulado O léxico no livro didático, desenvolvido desde 2013, com o apoio de cinco bolsistas de iniciação científica. Um dos objetivos do projeto é revisitar os estudos lexicais, desenvolvidos nas três últimas décadas, principalmente aqueles de Irandé Antunes (2012), Carlos Alexandre Gonçalves (2007); Margarida Basílio (1998; 2006), Luiz C. de A. Rocha (1998), entre outros, buscando aporte teórico relevante para repensar procedimentos didáticos voltados para o ensino do léxico e para a ampliação do vocabulário. Outro objetivo é analisar um corpus constituído de dicionários escolares e livros didáticos de língua portuguesa de ensino fundamental e médio, com o intuito de compilar propostas pertinentes de ensino do léxico. Ambos os objetivos, de certa forma, querem verificar se é verdadeira a hipótese de Antunes de que, apesar de os estudos linguísticos terem implementado uma série de inovações no ensino de língua portuguesa, principalmente no que tange ao estudo do texto e do discurso, o tratamento do léxico permanece em segundo plano. A condução das reflexões terá como estudo de caso o tratamento dado ao processo de formação de substantivos com os sufixos -inho  e -ão.
Muitas gramáticas, muitas normas: por que ensinar língua padrão?
Authors: Caetano Marcelo Moraes
Published: August 2017

A linguagem, com a pluralidade que seu conteúdo encerra, se realiza na expressão de uma língua concreta, atravessada pela interdiscursividade, patenteada na multiplicidade de textos, de que tratam autores como Charaudeau e Maingueneau (2011). Toda língua, por ser imanente a pessoas com histórias e culturas diversas, apresenta extensa diversidade discursiva, refletida nos domínios ou comunidades diferentes que dela lancem mão. Todos esses diversos domínios, no entanto, apresentam normas para que seus falantes se compreendam. Essas normas, quando agrupadas em conjuntos, podem ser consideradas como gramáticas que perpassam e descrevem as variantes da língua em questão, o que ocasiona uma polissemia inerente aos conceitos de “gramática” e de “norma”. Cabe à escola a perspectiva de, dialeticamente às variantes havidas por diversos fatores, apresentar ao aluno a variante da língua chamada padrão, porque tal variante é adequada a certos contextos situacionais e, por isso, seu conhecimento permite o acesso pleno à cidadania, como mostra Azeredo (2008). Procuro, neste artigo, explicitar essa afirmação, bem como esboçar meios para que haja êxito no ensino da gramática da norma padrão, alicerçado num conjunto de práticas que envolve a prescrição (evidenciada por estudiosos como BECHARA, 1990), a subjetividade (encarecida por linguistas como BENVENISTE, 1998) e a alteridade (presente nos trabalhos de FIORIN, 2006; NEVES, 2000 e ANTUNES, 2003).
Análise do discurso e ensino de língua materna: a construção do sujeito autor
Authors: Garcia Avany Aparecida
Published: August 2017

Este artigo busca estabelecer relações possíveis e convenientes entre a Análise do Discurso e o ensino de língua materna, no sentido de se promover a formação de um sujeito autor crítico, com o respaldo linguístico necessário para o exercício da cidadania. Ao explicitar mecanismos discursivos da linguagem, considera-se o uso estratégico destes em produções textuais que, submissas às imposições sistêmicas, imprimem em seu conteúdo um caráter de intervenção no contexto histórico-social. Para tanto, são apreciadas postulações que conduzem a uma elaboração materialista do discurso, na qual este é apreendido como uma prática, e a língua, concebida a partir de sua relação com a materialidade histórica. Conjectura-se, assim, a construção estratégica de um sujeito autor que, sendo responsável pela coerência e consistência do que produz e, relacionando-se com sua exterioridade e interioridade, pode constituir-se e mostrar-se como autor em seu meio (ORLANDI, 1993). Depreendeu-se dessa análise que, para a efetivação da prática discursiva, a escola, como um todo e, especialmente, as aulas de língua materna constituem um espaço privilegiado.
#RainhaDaNação: multimodalidade e subversão na construção do poder da personagem Dilma Bolada
Authors: Santos Leonel Andrade dos , Pacheco Jorge Tércio Soares
Published: August 2017

Este trabalho tem como objetivo analisar como se dá a construção do poder da personagem Dilma Bolada em suas postagens no Facebook. Para isso, ancoramo-nos na proposta teórica de Kress e van Leeuwen (2006) no que e refere à metafunção composicional e levamos em consideração os modos que compõem a tessitura textual, seja verbal ou visual. Além disso, articulamos esses pressupostos ao conceito de subversão postulado por Maingueneau (2004). Esta pesquisa possui natureza interpretativa qualitativa sobre um corpus composto por três postagens realizadas na página oficial da personagem Dilma Bolada no Facebook, publicadas e coletadas entre abril e maio de 2014. Dentre as várias publicações realizadas nesse período, elencamos aquelas cujo tema gravitava em torno da série Game of Thrones. Ressaltamos que essas postagens fazem referência a duas construções imagéticas distintas: à Presidente do Brasil Dilma Rousseff e ao referido seriado televisivo, criando, por meio dessas imagens, a personagem Dilma Bolada. Evidenciamos, nessas publicações, a valorização do poder de Dilma Bolada alcançado pelo uso das cores fortes e vibrantes de suas vestimentas, pela posição central, ou por estar próxima ao plano ideal, além da subversão do universo da série Game of Thrones, o que proporciou à personagem características de força e soberania. A investigação nos permitiu concluir que os traços da composição visual, potencializados pela subversão do contexto da Presidente Dilma Rousseff e do seriado Game of Thrones, contribuíram para a construção da imagem de poder da personagem Dilma Bolada.
Rock deterioration in the masonry walls of the Cathedral Basilica of Aguascalientes, Mexico
Authors: Padilla-Ceniceros Raudel , Pacheco-Martínez Jesús , López-Doncel Rubén Alfonso , Orenday-Tapia Edith Estefanía
Published: August 2017

Se utilizaron tobas volcánicas de alta porosidad para construir los muros de mampostería de la Catedral de la ciudad de Aguascalientes, en el centro de México. En la actualidad, la mampostería de piedra muestra evidencias de deterioro, principalmente en la parte inferior de las paredes exteriores debido al efecto de la humedad y la contaminación ambiental que está causando daños tales como microdescamación, descamación y pátina. Se realizaron estudios petrológicos que incluyeron difractometría de rayos X y análisis petrofísico como determinaciones de porosidad, densidad y densidad aparente, así como un levantamiento de daños de piedra para obtener información sobre los tipos de rocas utilizados para elaborar los muros de mampostería, sus características petrológicas y daños físicos. No se desarrollaron pruebas compresionales debido a la falta de muestras de piedra pero hay datos reportados para estas piedras por otros autores. Los resultados permiten identificar el tipo de piedra más propenso a deteriorarse, el mecanismo de deterioro de la piedra, y los factores que aceleran el deterioro. Aunque los resultados tienen un uso pragmático para las obras de restauración de la Catedral de la ciudad de Aguascalientes, la metodología aplicada podría ser utilizada para determinar la vulnerabilidad de las rocas a deteriorarse en edificios patrimoniales en cualquier lugar del exterior.
Editorial
Authors: CEA Revista
Published: August 2017

Editorial
El impacto de las estrategias en el marketing mix de la Mipyme en la zona de la purísima en el municipio de Aguascalientes, México
Authors: Ortiz-Delgadillo Gabriela , Toraya Pedroza Roussell Li-erth , Femat-Esparza Oscar
Published: August 2017

La presente investigación fue realizada con el objetivo de conocer el impacto de las estrategias en el Marketing mix de las Mipymes en la zona de La Purísima del municipio de Aguascalientes. Se realizó un estudio cuantitativo, utilizando un modelo descriptivocorrelacional, de corte trasversal, aplicado el instrumento a una muestra de 133 propietarios de las microempresas del sector comercial en La Purísima. Para el análisis de los datos, se apoyó en la técnica estadística de regresión lineal con apoyo del software SPSS versión 20, en donde los resultados muestran ser representativos, es decir, las estrategias exploradoras y defensivas impactan más en el Marketing mix en comparación de las estrategias analizadoras y reactivas. Es de suma importancia que los dueños de estas empresas decidan hacer uso de la investigación de mercados, esto les permitiría conocer qué está demandando el mercado y qué técnicas especializadas de marketing pueden utilizar para que el Marketing mix evolucione y se acondicione a los cambios del mercado.
Aplicación de la metodología Commonkads en la Gestión del Conocimiento
Authors: Giraldo-Jaramillo Luis Fernando , Montoya-Quintero Diana María
Published: August 2017

La gestión del conocimiento es el proceso por el cual una organización facilita la trasmisión de información, conocimientos, experiencias y habilidades a sus empleados, de una manera sistemática y eficiente. El presente artículo relaciona la aplicación de la metodología Commonkads en la gestión de la calidad, al interior de la organización Bavaria en la ciudad de Medellín.La aplicación de la metodología mencionada permite evidenciar la importancia del análisis organizacional y estratégico en la introducción y desarrollo de tecnologías de la información, así como demostrar que dicha metodología soporta aplicaciones de ingeniería y de gestión del conocimiento a la hora de construir los sistemas basados en el conocimiento; necesarios para solucionar problemas de control de procesos, monitorización, diagnóstico y mantenimiento de fallos, entre otras, es decir aspectos relacionados con la calidad del proceso.
El impacto de la relación con el cliente y de la capacidad de valor agregado en el servicio en el rendimiento de la Pyme Manufacturera en Aguascalientes
Authors: Ortiz-Delgadillo Gabriela , Esquivel-Aguilar Edgar Omar , Hernández-Castorena Octavio
Published: August 2017

La presente investigación se realizó con el objetivo de conocer el impacto de las relaciones con el cliente y la capacidad de agregar valor al servicio sobre el rendimiento de la gestión de la cadena de suministro de las Pymes del estado de Aguascalientes. Para esto, se realizó un estudio cuantitativo, con alcance correlacional, de corte transversal, en el cual se construyó un instrumento de medición tipo escala de Likert. Este instrumento, se encuentra compuesto por 27 ítems, dividido en 3 bloques principales: Relación con los clientes (16 ítems), capacidad de agregar valor agregado al servicio (5 ítems) y rendimiento (6 Ítems), los cuales fueron aplicados a una población de 213 empresarios de la ciudad de Aguascalientes. El análisis de los datos fue realizado a través de la técnica estadística de la regresión lineal, para lo cual se hizo uso del software estadístico IBM SPSS versión 20, donde los resultados más significativos mostraron que la relación con los clientes es parte fundamental para que las Pymes alcancen un mayor rendimiento en la gestión de la cadena de suministro.
Desarrollo financiero, acumulación de capital foráneo y pobreza: modelo teórico RBC en economía pequeña abierta
Authors: González-Uribe Gabriel Jaime
Published: August 2017

La economía mundial se caracteriza por altos niveles de pobreza. Algunos autores han relacionado el desarrollo financiero, entendido como todas aquellas medidas que le permiten al sistema financiero reducir los costos de información y transacción, facilitando la movilización y locación eficiente del capital con los niveles de pobreza de los países. Este artículo utiliza el marco teórico Kollintzas y Vassilatos (2000) para hacer una aproximación desde un modelo simple de Ciclos Económicos Reales (o RBC por sus siglas en inglés), endogeneizando los costos de transacción, relacionándolos con el desarrollo financiero de los países. Los resultados indican que mejorías en el desarrollo financiero afectan las decisiones óptimas de los individuos e incide indirectamente en la remuneración de los factores de producción, entre ellos el trabajo.
Cambio tecnológico, exigencias de acción y pensamiento colaborativo
Authors: Cázares-Garrido Ilia Violeta , Urbiola-Solís Alejandra Elizabeth
Published: August 2017

Actualmente se reconoce que el «saber hacer» es valioso para las empresas y los ciudadanos. El conocimiento es un elemento que ha sido estrechamente ligado a la competitividad; por ello, la tecnología ocupa hoy un lugar importante en la vida cotidiana de las personas. En las empresas, la gestión de la tecnología y la vinculación con universidades, gobiernos y centros de investigación está ligada con el «saber hacer» y más allá de este, con el «saber ser». Este último implica exigencias de acción ciudadana y se objetiva en lograr acciones sustentables y descentralizar procesos para reducir costos. Todo esto permeado por un pensamiento colaborativo que, en los mercados, obliga tanto a profesionistas como a empresarios a tener una capacidad de respuesta rápida ante las exigencias del mercado.
Estimación de la demanda, aplicada a una innovación de tipo MEMS mediante el modelo de Bass
Authors: Nava-Jiménez Roberto , Escamilla-Santana Clara
Published: August 2017

El avance en paralelo que han tenido la mecánica y la electrónica ha creado una nueva tecnología, conocida como de micro maquinado; lo que ha permitido hacer diseño y fabricación de estructuras eléctricas y mecánicas bajo el nombre de Sistemas microelectromecánicos. Esta tecnología de orden disruptivo tiene un potencial sobresaliente para ser empleada en los dispositivos electrónicos, que se incorporan en alguna parte de nuestro cuerpo. ¿Cómo determinar el grado de adopción de los MEMS, siendo esta la tecnología de tipo habilitadora (enabling technology) aplicada a un producto en el campo de la tecnología que se lleva puesta (wearable technology)? Este trabajo propone el uso del modelo de Bass como herramienta para definir el grado de difusión, con el cualpoder identificar la tendencia de adopción del reloj inteligente (smart watch) en distintos países del mundo y con ello una aproximación del tamaño de mercado, haciendo prospectiva en el rubro de los productos de consumo como uno de los sectores más promisorios en demanda futura, también es mostrado el efecto innovación versus imitación, siendo estos factores relevantes para la elaboración de estrategias de marketing y pronósticos de demanda en un nuevo producto.
La descentralización en Colombia, ¿realidad o espejismo? Consideraciones sobre la actualidad del proceso
Authors: Asela-Molina Jorge Enrique
Published: August 2017

En artículo tiene, como primer objetivo, explicar el modelo descentralizado desde un punto de vista teórico, considerado los aportes de diferentes autores de la teoría económica, haciendo principal énfasis en los avances de los aspectos políticos y económicos, en lo correspondiente al manejo del Estado. Como segundo objetivo, se realizará una mirada más cercana al proceso de descentralización en Colombia, partiendo desde la Constitución de 1991, algunos de sus avances, retrocesos y desafíos en la actualidad. Finalmente, se presentará un breve análisis sobre la dependencia de los entes territoriales a los recursos que por transferencias entrega la Nación, esto a través de la descripción del indicador de dependencia intergubernamental planteado por el DNP.
Sistema general de regalías: nuevos recursos para la ciencia, tecnología e innovación en Colombia
Authors: Becerra-Arévalo Yiseth Marina
Published: August 2017

Este artículo presenta un balance de la implementación del Fondo de Ciencia, Tecnología e Innovación del Sistema General de Regalías en Colombia (FCTeI-SGR). La entrada en vigencia del SGR y la respectiva creación del FCTeI-SGR, ha abierto una oportunidad para la ciencia, la tecnología y la innovación en el país y se espera que estos nuevos recursos impacten a las regiones. Antioquia se destaca por el número de proyectos aprobados y la diversificación de temas estratégicos priorizados para presentar al FCTeI-SGR, enfocando los esfuerzos en el fortalecimiento de la CTeI en los sectores de la salud, agropecuario y formación de capital humano, entre otros.
Consumos de energía en la industria del plástico: revisión de estudios realizados
Authors: Vargas-Isaza Carlos Andrés , Posada-Correa Juan Carlos , Jaramillo-Zapata Leyla Yamile , García Luis Alberto
Published: August 2017

El nivel de consumo energético para la producción de artículos plásticos es una variable que en los últimos años ha cobrado gran importancia, ya que tiene no solo un impacto ambiental en su uso racional sino que tiene un costo representativo para la producción. El artículo contiene una breve justificación de la relevancia de cuantificar el consumo de energía requerido para la producción de piezas plásticas, como también la forma de medirlo en variables tales como consumos fijos y variables, así como determinar el consumo de energía específico por planta de procesamiento, proceso y por equipos. Posteriormente, se hace un recuento de diferentes estudios de consumo y uso eficiente de la energía más relevantes en la industria del plástico, a nivel regional, nacional e internacional. El presente artículo es logrado con el objetivo de proveer un material de referencia básico a investigadores interesados en este tema.
Editorial - Ciência e educação em risco de sobrevivência no Brasil (Editorial - Science and education at risk of survival in Brazil)
Authors: Martins Marcos Francisco
Published: August 2017

Este Editorial da Crítica Educativa, v. 3, n. 1, relativo ao 1º sem. 2017, apresenta uma crítica a atual situação da ciência e da educação no âmbito nacional, as quais estão em risco de sobrevivência no Brasil pelas temerosas gestões do governo Temer, que é articulado pela mesma lógica política neoliberal de muitos governos estaduais.