bluuebunny/crossref_metadata_2025 huggingface dataset:
IMAGENS DO NECROCAPITALISMO NO BRASIL: A INDÚSTRIA MINERADORA DE NIÓBIO
Authors: De Lima Ana Flávia Martins , Oliveira Cíntia Rodrigues de
Published: October 2020

Este registro fotográfico teve como objetivo capturar os mundos de morte resultantes de práticas necrocapitalistas de acumulação de capital na indústria do nióbio e a resistência das populações tradicionais no município de Catalão, Goiás. A partir da análise de documentos e do material fotográfico foi possível caracterizar as práticas de acumulação como crimes corporativos perpetrados em um  contexto de exploração neocolonial marcado pela subalternidade do Estado a grandes corporações justificado por meio do discurso do desenvolvimento cujos efeitos englobam a expropriação das comunidades, a destruição dos meios de vida e a resistência das populações tradicionais.
Research on vibration response of a reducer of electric vehicle
Authors: Xu Peiyun , Li Huibin , Hu Dongmei , Cao Cheng
Published: October 2020

In order to study the vibration response of reducer of electric vehicle, a model for the reducer is established in ANSYS Motion, a multi-body dynamics software. Firstly, a 3D model of the reducer is built, including such assemblies as its shaft, gears, bearing, and its case. Secondly, based on the finite element model, the modal simulation is carried out. Finally, under the specified operating condition when the motor speed increases from 0 rpm to 10000 rpm, with using the STFT method, the vibration response of the reducer is obtained through the multi-body dynamics simulation. After comparing the simulation results between different marked nodes, the conclusion indicates that this process can calculate the vibration characteristics of the reducer quickly and accurately and can lay the foundation for the structural optimization in terms of vibration and acoustic properties.
Comparison on yield mechanism of strong column-weak beam of reinforced concrete frame structure
Authors: Tian Hui , Dong Yinfeng
Published: October 2020

Ductility is an important aspect of the seismic performance of structures. Strong column and weak beam are important means to ensure the hinge plastic failure mechanism of frame structures. The corresponding provisions on failure mechanism of strong column-weak beam has been specified in design codes of various countries, but their differences are relatively large. This paper takes a plane frame as example which is designed according to the seismic code regulations of various countries, and then the difference in the failure mechanism of the designed frame under seismic actions is compared and analyzed. Finally, some suggestions are given to ensure the realization of strong column-weak beam mechanism.
Design and simulation of shear-tension spring-type quasi-zero stiffness isolator
Authors: Shi Peicheng , Yang Jianfeng , Li Jing , Xiao Ping
Published: October 2020

By connecting the linear compression spring (positive stiffness mechanism) in parallel with the tension spring (negative stiffness mechanism) and using the shear lever mechanism to amplify the motion of the negative stiffness mechanism, a shear-tension spring type quasi-zero stiffness isolation system is constructed, which is suitable for low-frequency and ultra-low-frequency vibration isolation, especially for small-amplitude, low-frequency vibration isolation. In addition, the vibration isolation system has adjustable function. When the mass of the isolated object changes, it is needed to adjust the linear bearing at the bottom of the vertical spring to change the length of the spring, so as to keep the isolation system in the equilibrium position of the quasi-zero state. The results show that the isolator has excellent performance in isolation of low frequency vibration with small and micro amplitude.
A sensor fault diagnosis method based on KPCA and contribution graph
Authors: Wang Yuanqing , Deng Fan
Published: October 2020

In this paper, a sensor fault diagnosis method based on KPCA and contribution graph are proposed to adapt to the nonlinear and non-Gaussian characteristics of the system. Based on the kernel function theory, this method uses SPE and T2 statistics for fault detection and contribution graph for fault location, thus completing fault diagnosis. The numerical simulation results verify that the proposed method is more effective than the traditional PCA method in detecting nonlinear faults. At the same time, the KPCA contribution map can be used to accurately locate the fault sensor, which can provide a reference value for the sensor fault diagnosis of nonlinear systems in the future.
Design and analysis of gripper for automatic drilling machine
Authors: Pan Huanhuan
Published: October 2020

In order to improve the synchronicity of the gripper of automatic drilling rig, three kinds of clamping devices for automatic drilling rig were designed to overcome the problem of deviation between the clamping center of the clamping device and the rotary center of the power head. At the same time, the driving characteristics, structures and working principle of the three grippers were introduced. With the finite element analysis conducted on the main structure parts, the results showed that the structure design and the parameter selection of the synchronous clamping mechanism component could meet the application requirements and could provide the guarantee to the reliability of the clamping mechanism and the integral performances of the automatic drilling rig.
Multi-objective optimization of CFRP engine hood considering dynamic performance based on surrogate model
Authors: Gao Yunkai , Chen Jiaju , Liu Zhe , Yuan Ze
Published: October 2020

This paper uses a steel engine hood as a prototype to design a carbon fiber reinforced plastic (CFRP) engine hood, analyzes the dynamic performance of the engine hood and optimizes the dynamic stiffness index while considering lightweight of the structure. Taking the layer thickness of each ply orientation of the CFRP engine hood as the design variable, the optimal Latin hypercube design (Opt-LHD) method is applied for uniform sampling. Moreover, the Kriging model method and response surface model (RSM) method are used to construct the surrogate model of the total mass, equivalent dynamic stiffness of critical points, and the first-order modal frequency. Then the Non-dominated Sorting Genetic Algorithm NSGA-II is used for multi-objective optimization with the equivalent dynamic stiffness and mass of the CFRP engine hood as the optimization objective. Finally, the optimized CFRP engine hood was trial-produced and compared with the original steel engine hood. The results indicate that the optimized CFRP engine hood has better dynamic stiffness performance; furthermore, the lightweight effect reaches 24.4 %.
Dynamics analysis of a novel two-translation parallel mechanism
Authors: Wang Hongzhou , Song Mengmeng , Li Mengwei , Yang Ru , Jiang Zhen
Published: October 2020

In this paper, we take a novel two-translation parallel mechanism based on variable length parallelogram structure as the research object, and carry out the research on the dynamic characteristics of the mechanism. Based on the principle of virtual work, the dynamic model of the new two-translation parallel mechanism is established. By numerically solving the dynamic model, the dynamic behavior of the new mechanism with impact characteristics is found, which provides a theoretical basis for optimizing this new mechanism.
Optimal design of a large-span spatial structure based on dynamic elastic-plastic analysis
Authors: Liu Feipeng , Liu Xuejun , Dong Lvhe , Tian Hui , Li Dong , Huang Xu
Published: October 2020

With the expansion of the urban areas and the rapid growth of the urban population, the disposal of large amounts of domestic waste has become a problem faced by large cities. To solve this problem, many MSW incineration power plants have been continuously built. As a typical large-span spatial structure of waste incineration power plant, how to achieve economic, beautiful, and environmentally friendly design goals under the premise of meeting the requirements of the production process is an important problem currently facing. In this paper, a structural design optimization method based on damage index is proposed. Taking a large-span mixed structure of a MSW incineration power plant as an example, the paper firstly uses the dynamic elastic-plastic time history analysis method to evaluate its seismic performance, and then optimizes the structure according to the damage degree of the structure under small and large earthquakes design. The results show that under the premise of meeting the requirements of the code, this method can ensure that the degree of structural damage under the earthquake remains almost unchanged, while significantly reducing the amount of building materials and reducing the cost. At the same time, this method is more direct, simple, and effective than optimization design methods based on experience and internal forces of structural members.
A python application to calculate the mode shapes of rectangular plates
Authors: Nedelcu Dorian , Barbinta Constantin-Ioan , Gillich Gilbert-Rainer , Korka Zoltan-Iosif , Hatiegan Cornel
Published: October 2020

We propose a continuous model for rectangular plates that involves a mesh of slender interconnected beams. These beams are disposed orthogonally. The advantage of this model is that simple equations are involved and the behavior of the plate is accurately described. After a brief description of the model, we present an application written in the Python programing language that allows calculating the mode shapes for rectangular plates with various boundary conditions. The mode shapes achieved with the application for a specific plate are found to be similar with those obtained from simulation involving the SolidWorks software. In consequence, we conclude that the proposed model is reliable and the application developed on this base can be used to study the behavior of rectangular plates with different boundary conditions.
Circular crack identification in plates based on natural frequency evaluation
Authors: Hamat Codruta Oana , Praisach Zeno-Iosif , Barbinta Constantin-Ioan , Korka Zoltan-Iosif , Gillich Gilbert-Rainer
Published: October 2020

We propose in this paper a method to detect cracks in circular plates clamped at the circumference. It consists in analyzing and interpreting the frequency changes that occur due to a circular arc crack. We show that the effect of the crack depends on the strain energy loss, which actually is proportional to the curvature achieved by the affected region in the radial direction. Three types of cracks are considered herein to demonstrate this dependency, differing by their length. Modal analysis is performed involving a professional simulation software for the intact plate, and that with the generated cracks. We found a perfect fit when we compared the curvature of the plate in the radial direction obtained with the analytical relation with the frequency values for the crack displaced along the radius. Therefore, using the curvature of several vibration modes we can obtain damage patterns that can be used to locate circular cracks.
Uncertainties and risks in reservoir operations under changing hydroclimatic conditions
Authors: Aljoda Ali , Jain Shaleen
Published: October 2020

Uncertainties and risks associated with hydroclimatic variations pose a challenge to the management and planning of water resources systems. This study demonstrates the importance of understanding the changing hydrologic regime of the Feather River Basin (FRB) and its impacts on water resources decision variables (i.e., storage requirement and performance of a water supply reservoir). A simple storage–yield–reliability model (S–Y–R) is used to quantify the risk of the stationary-based designed reservoir under the temporal variation and nonstationarity in N-year blocks of the Feather River Inflow into Lake Oroville (FRI). Furthermore, the potential linkages of the long-term variability in the FRI to climate variations are investigated by applying wavelet spectrum and coherence analysis to the FRI and atmospheric–oceanic indices (e.g., ENSO and PDO). The results show substantial variations in the FRB hydrologic regime over different timescales with episodes of abrupt shifts toward significantly higher storage requirements, and decrease in the reservoir performance during historical periods of high FRI variance and lag-1 serial correlation. Although the mean inflows are high, the storage capacity is increased by (a) 38 and 48% due to the 5 and 20% increase in the FRI variance during the periods 1904–1953 and 1960–2009, respectively, and (b) 34% due to the increase in the serial correlation coefficient in the period of 1750–1799. Likewise, reservoir performance significantly decreased for the same reasons in the same critical periods. The reliability and resilience dropped to 74 and 29% (1904–1953) and to 76 and 50% (1960–2009 period) due to the increased variance of FRI, while vulnerability reached 70% during the high lag-1 correlations in 1532–1581 and 1564–1613, and 40% in 1904–1953 due to the high FRI variance. Furthermore, the wavelet coherence analysis observes strong associations between the streamflow and climate teleconnection patterns in specific periodic cycles during the same critical periods which link the variability in FRI and decision variables to the hydroclimatic variations. These linkages give a primary indication for the reservoir storage requirement characterization.
New ion-chromatography method for detection of chlorite, chlorate, and bromate in drinking water
Authors: Paun Iuliana , Iancu Vasile Ion , Chiriac Florentina Laura , Vasilache Nicoleta , Pirvu Florinela , Niculescu Marcela , Galaon Toma
Published: October 2020

A direct ion chromatographic method for the determination of chlorite, chlorate, and bromate in the presence of fluoride, chloride, nitrate, nitrite, and bromide in treated drinking waters was described. Separation of target analytes was achieved using an AS19-HC analytical column (250 mm x 4 mm), AG 19- HC guard column (50 mm x 4 mm), and KOH 25 mmol/L as mobile phase. Inorganic analytes were eluted using a flow rate of 1 mL/min. The column temperature was set up and maintained at 300C. The analyte ions
were quantified using a suppressed conductivity detector.
Elisa preliminary studies of immobilization and specific detection of bacterial strains
Authors:   National Research and Development Institute for Industrial Ecology, Mihalache Madalina , Banciu Alina , Ionescu Lucian , Nita-Lazar Mihai
Published: October 2020

The paper aims to emphasize the specific detection of bacterial strains using enzyme-linked immunosorbent assay. The assay is based on the specific binding of polyclonal antibody anti-E. coli tagged with FITC to E.coli and monoclonal antibody anti-Ps. aeruginosa tagged with Alexa Fluor 647 tagged to Ps. aeruginosa and on subsequent enzymatic immunological demonstration of the conjugated enzyme. In this experiment, the negative control was the Salmonella enterica strain. The two antibodies had no interaction with the negative control, instead, they were specific for E. coli and Ps. aeruginosa strains. When both strains were in the same well, the fluorescence intensity given by the presence of E. coli was 2.3 times higher than that given by Ps. aeruginosa, and the intensity of fluorescence decreased if there are both bacterial strains in the wells.
Determination of position of hydraulic jump in a flume by using CFD and comparison with experiential results https://doi.org/10.21698/rjeec.2020.211 P
Authors:   Konya Technical University, Turkey, Yildiz Ali , Marti Ali Ihsan , Yarar Alpaslan , Yilmaz Volkan
Published: October 2020

Dams and hydraulic structures are used for the supply and control of water, which have great importance on human life. The sluice gate is one of the hydraulic control structures. Sluice gates release excess water from the reservoir to the downstream side in a controlled manner with a certain discharge for controlling the level of the reservoir. A hydraulic jump is created to dissipate the energy of flow coming from under the gates. A hydraulic jump occurs when the flow regime is changed from subcritical to supercritical. However, the position of the hydraulic jump in the channel should be known exactly to prevent damage to surrounding structures. In this study, an open channel system with a sluice gate is used to produce a hydraulic jump. Experiments are conducted for two different gate openings (a1=1.5 cm and a2=2 cm) and 16 discharge values. For each case, the position of the hydraulic jump is determined. In addition, flow depths at 5 different points were measured including before and after the hydraulic jump. The results obtained from the experimental study were compared with the numerical model in terms of the position of hydraulic jump and flow depths. According to the results obtained, the numerical model and the physical model showed between 80 and 91% consistency.
Modeling of broad crested weirs by using dynamic similarity and CFD
Authors:   Konya Technical University, Turkey, Yildiz Ali , Yarbasi Goknur Elif , Yarar Alpaslan , Marti Ali Ihsan
Published: October 2020

Broad crested weirs and steps are used to regulate the flow in the channel, increase the water level at the upstream side, and measure the discharge. The construction of the broad crested weirs is more practical and also they are more stable compared with the other types of weirs. To serve in accordance with the purpose of their construction, broad crested weirs should be designed and built by considering certain criteria. Before the hydraulic structures are built, model experimental setups are constructed in the laboratory and problems to be encountered are tried to be determined. However, there may be differences between the structure to be built in real life (prototype) and model due to scale effect. These possible differences must be determined and necessary measures must be taken. In this study, the model and prototype of the broad crested weir are constructed in two different open channel systems by using Froude similarity. The geometric similarity between model and prototype is determined as Lr = 4. 44 experimental data were collected from model and prototype. The results obtained from the model and prototype are compared according to hydraulic similarity rules. In addition to the physical experimental setups, numerical models were created using the ANSYS Fluent for the model and prototype separately. By comparing the numerical model and physical experimental setups, optimum mesh size is tried to be determined. According to the results obtained from experimental setups, differences were observed in the position of critical flow depths and downstream water levels due to scale effects.
Determination of phosphorus in different types of waste using the ICP-MS technique
Authors:   Determination of phosphorus in different types of waste using the ICP-MS technique, Catrina Gina Alina , Kim Lidia , Serbanescu Agnes , Cristea Ionut , Barbu Mona , Nicolescu Ileana , Vasile Gabriela Geanina
Published: October 2020

The research aimed to provide an optimized method for the determination of phosphorous concentration in different types of solid waste using inductive coupled plasma mass spectrometry (ICP-MS) technique. The analyzed waste matrices are: a) vegetable waste (P1), b) ash from the incineration of medical waste (P2) c) sewage sludge (P3) and d) sludge from the meat processing industry (P4). The results obtained by the ICP-MS method were compared with the UV-VIS spectrophotometric method for the determination of total phosphorus. In the case of using the colorimetric method by UV-VIS technique, lower results were obtained compared to the ICP-MS method due to the interferences given by the reagents used to determine the total phosphorus. The interferences given by other elements (metals) were also investigated and the performance parameters were determined such as detection limit, quantification limit, recovery and expandend incertainty using ICP-MS technique.
Sustainable sludge management - its use for remediation of degraded lands
Authors:   National Research and Development Institute for Industrial Ecology, Nicorescu Valeria , Andres Ladislau , Negrea Sorina Claudia , Neidoni Dorian Gabriel , Lehr Carol Blaziu , Orha Corina ,   National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara, Romania
Published: October 2020

The sludge resulted from the urban wastewater treatment plants, can be used, from a circular economy, as a fertilizer for agricultural and degraded lands, for horticulture and forestry. This paper aims to propose an alternative for the use of this type of sludge in a sustainable way, with a low impact on the environment. The study consisted of experiments done to recover the stabilized sludge from the urban wastewater treatment plants in the process of degraded land rehabilitation, using the energetic willow, Salix sp. The experimental results showed that the use of stabilized sludge as fertilizer for naturally and anthropogenic degraded lands determined the improvement of nutritional characteristics of the lands cultivated with Salix sp., and allowed the growth, development, and maintenance of this plant. Taking into consideration the characteristics of the cultures and the quantities of metals accumulated by Salix sp., it can be concluded that these plants were adapted to the environmental conditions and the substrate toxically composition. The results obtained on two degraded lands indicate that Salix sp. can be used for its introduction in the economic circuit, both for salty soils and ash dumps.
UM OLHAR SOBRE A FORMAÇÃO PARA A DOCÊNCIA NO ENSINO SUPERIOR AO LONGO DA PÓS-GRADUAÇÃO EM QUÍMICA
Authors: Gomes Lima Ferraz Victor , Carla Silva Mota Driele , Guilherme Silva Lopes José
Published: October 2020

A pós-graduação tem como foco a produção de conhecimento e por consequência a formação de pesquisadores, no entanto, é a responsável legal pela formação de professores para a docência no Ensino Superior. Atualmente algumas atividades formativas da pós-graduação são voltadas para a docência, como o estágio de docência obrigatório para bolsistas, e a tutoria. Esta pesquisa teve como objetivo investigar as contribuições dessas atividades na formação de pós-graduandos. Para tal, foram analisados, a partir da análise de conteúdo, 39 questionários de pós-graduandos cursando o estágio. Os resultados permitem inferir que as experiências vivenciadas ao longo do estágio são as principais contribuições. Entretanto, ainda é tímida a reflexão sobre a prática docente, de modo que acreditamos que professor e pós-graduando devam estabelecer uma relação formativa do início ao fim da disciplina, superando a concepção de um estágio de docência limitado a um viés prático. Concluímos que o estágio de docência e a tutoria tem relevante contribuição na formação dos estudantes, com potencial para desenvolver a reflexão crítica e formação continuada de pós-graduandos e professores do Ensino Superior. Acreditamos também que este estudo possa contribuir para o fomento de políticas institucionais voltadas para a formação docente na pós-graduação.
ATIVIDADES DE METODOLOGIAS ATIVAS PARA MATEMÁTICA COM ELEMENTOS DIDÁTICOS DA BNCC
Authors: Ferreira João Socorro Pinheiro
Published: October 2020

Este Artigo Científico, apresenta resultados de estudos sobre a construção de propostas de atividades para as Práticas Computacionais nos Fundamentos da Matemática (PCFM) dos cursos de licenciatura em Matemática, que priorizam as habilidades sobre o uso de Tecnologias Digitais de Informação e Comunicação (TDIC), com ênfase na metodologia proposta pela Base Nacional Comum Curricular (BNCC), através de softwares educacionais, como o wimplot e o Geogebra e planilhas eletrônicas como o Excel. Serão explorados temas intrínsecos à BNCC como: Competência Geral (CG), Específica (CE), Unidade Temática (UT), Objeto de Conhecimento (OC) e Habilidade (H), para escolares a partir dos Anos Finais do Ensino Fundamental (AFEF) – que abrange do 6º ao 9º ano – e nas três séries/ano do Ensino Médio (EM) de modo que se compreenda melhor as propostas da BNCC. As habilidades apresentadas são aquelas que dizem respeito as UT’s que utilizam ambientes computacionais para o ensino e aprendizagem de matemática com as mais novas técnicas de estudos. São apresentadas propostas de ensino a luz da BNCC, de material produzido e trabalhado em sala de aula com os acadêmicos de matemática no laboratório de informática aplicada ao ensino de matemática. São sugeridas a utilização das metodologias ativas, como por exemplo: Trajetória Hipotética de Aprendizagem (THA) de Simon e Aprendizagem Baseada em Problemas (PBL), do inglês Problem Based Learning e a produção de algoritmos para resolver problemas com o uso de aplicativos como por exemplo o Geogebra.
PRODUTO EDUCACIONAL: DESAFIO DO MESTRADO PROFISSIONAL EM EDUCAÇÃO
Authors: Zaidan Samira , Reis Diogo Alves Faria , Kawasaki Teresinha  Fumi
Published: October 2020

Como se relacionam a elaboração de dissertação e produto educacional no processo do Mestrado Profissional em Educação (MPE)? Este relato reflexivo apresenta a experiência dos orientadores da Linha Educação Matemática do Promestre, mestrado profissional vinculado à área de Educação da Capes. No processo seletivo deste MPE, incentiva-se que os candidatos apresentem reflexões sobre suas práticas e destaquem desafios como problema de pesquisa. Ao final, o mestrando deve apresentar dissertação e produto educacional, sendo que este será um resultado concreto diante do desafio apresentado. No início, esperava-se que a pesquisa realizada conduzisse naturalmente à elaboração de produto educacional como um desdobramento, mas isto não ocorria, ficando, muitas vezes, o produto elaborado às pressas ao final e, por vezes, desvinculado do estudo realizado, da própria dissertação. As reflexões sobre a experiência mostram que a elaboração de um produto educacional necessita intencionalidade na orientação, já nos procedimentos metodológicos. Foi feita a escolha por um trabalho de orientação coletiva e, entre os procedimentos, a pesquisa-ensino. Relata-se quatro trabalhos desenvolvidos no Programa que refletem em seus processos de construção um equilíbrio entre produto educacional e dissertação. O entendimento aqui apresentado se mostra como especificidade do MPE, fortalecendo sua identidade como processo formativo de produção de conhecimento e recursos.
Écfrase, cinema e filosofia: o “poder transmedial” dos conceitos em Um teste de resistores, de Marília Garcia
Authors: Santos Yasmin Bidim Pereira dos
Published: October 2020

This article analyzes the ekphrastic poems of the contemporary Brazilian poet Marília Garcia, created from cinematographic works. Considering the transmedial approach of concepts in Garcia’s poetry – idea introduced by Joana Matos Frias in the article “‘Tudo o que em mim pensa est á filmando’: pertença e repetição na poesia brasileira contemporânea” (2016) – this article ex-plores the idea that the ekphrasis, in her work, appears as a form of critical analysis of the movies described. This approach suggests a poetic practice that is also an exercise in critical reflection, placing the self-poet in a double condition when in contact with the work of art, as a spectator and receiver and also as a producer of critical reflections through poetic making itself
Restos, resíduos e apropriações (quase)não-identificadas: estratégias da criação poética em o Livro das Postagens
Authors: Alfeld Elisabete
Published: October 2020

The poet, in the 21st century, travels through websites, surfs the internet, wanders through the cloud and comes up against the challenge of overcoming the challenge of the new time: ‘making poetry with pirated words’. Based on such considerations, the proposal of the article consists of verifying how the creation of the poem Livro das Postagens, authored by Carlito Azevedo (2016) is anchored in the methodology of “writing-through” (Perloff 2013). The study is organized in two stages: the first contextualizes specific moments in Brazilian poetry; the second presents the study on the poem Livro das Postagens.
Capacidad de enraizamiento de clones híbridos de Eucalyptus del Instituto Nacional de Tecnología Agropecuaria, Argentina
Authors: Ayala Paula , Surenciski Mauro , Harrand Leonel , Luna Claudia
Published: October 2020

La generación clonal de híbridos de Eucalyptus con parentales seleccionados con mayor adaptación a la región mesopotámica permitirá ampliar las fronteras forestales de los materiales tradicionales e incrementar la oferta de otros productos maderables. Pero un híbrido es operativamente útil solo si su clonación es factible; por ello el objetivo de este trabajo fue caracterizar la capacidad de enraizamiento de los clones híbridos de E. grandis x E. tereticornis y de E. grandis x E. camaldulensis mediante la técnica de mini estacas apicales con ácido indol butírico (IBA). Se evaluó el porcentaje de enraizamiento de miniestacas apicales de seis clones híbridos de Eucalyptus a los 50 días, dicho experimento se realizó con un diseño completamente al azar con tres repeticiones. Analizando los datos obtenidos de los híbridos interespecíficos E. grandis x E. camaldulensis; el clon GC-INTA-9 manifestó una clara superioridad de enraizamiento con respecto a los demás clones, con un 84±19,75 %; mientras que GC-INTA-12 y GC-INTA-27 tuvieron valores similares con 59±3,47% y 58±6,56% de enraizamiento respectivamente. Por otro lado, tenemos que el clon GT-INTA 31 con parentales E. grandis x E. tereticornis, fue el que mejor comportamiento demostró con un 68±8,56% de enraizamiento, mientras que GT-INTA 44 expresó un 43±16,81% y GT-INTA 37 con 8±10,37% ha sido el material menos idóneo para la rizogénesis de los híbridos interespecíficos evaluados. Estos resultados demuestran que existe una amplia variación en la capacidad de enraizado y/o supervivencia asociada con el genotipo de los clones utilizado
Concerns About Information Regarding COVID-19 on the Internet: Cross-Sectional Study
Authors: Zhao Yusui , Xu Shuiyang , Wang Lei , Huang Yu , Xu Yue , Xu Yan , Lv Qiaohong , Wang Zhen , Wu Qingqing
Published: October 2020

Background

Since the outbreak of COVID-19, the Chinese government and the Chinese Center for Disease Control and Prevention have released COVID-19–related information to the public through various channels to raise their concern level of the pandemic, increase their knowledge of disease prevention, and ensure the uptake of proper preventive practices.

Objective

Our objectives were to determine Chinese netizens’ concerns related to COVID-19 and the relationship between their concerns and information on the internet. We also aimed to elucidate the association between individuals’ levels of concern, knowledge, and behaviors related to COVID-19.

Methods

The questionnaire, which consisted of 15 closed-ended questions, was designed to investigate Chinese netizens’ knowledge about COVID-19. The self-selection online survey method of nonprobability sampling was used to recruit participants through Dingxiangyisheng WeChat (a public, medical, and health service platform in China) accounts. Standard descriptive statistics and multivariate logistic regression analyses were conducted to analyze the data.

Results

In total, 10,304 respondents were surveyed on the internet (response rate=1.75%; 10,304/590,000). Nearly all (n=9803, 95.30%) participants were concerned about “confirmed cases” of COVID-19, and 87.70% (n=9036) received information about the outbreak through social media websites. There were significant differences in participants’ concerns by sex (P=.02), age (P<.001), educational attainment (P=.001), and occupation (P<.001). All knowledge questions and preventive practices were associated with concerns about COVID-19. The results of the multivariate logistic regression indicated that participants’ sex, educational attainment, occupation and employment status, knowledge acquisition, and concern level were significantly associated with the practice of proper preventive behaviors.

Conclusions

This study elucidated Chinese netizens’ concerns, information sources, and preventive behaviors related to the COVID-19 pandemic. Sex, educational attainment, occupation and employment status, knowledge acquisition, and level of concern were key factors associated with proper preventive behaviors. This offers a theoretical basis for the government to provide targeted disease prevention and control information to the public.
Using an Ontology to Facilitate More Accurate Coding of Social Prescriptions Addressing Social Determinants of Health: Feasibility Study
Authors: Jani Anant , Liyanage Harshana , Okusi Cecilia , Sherlock Julian , Hoang Uy , Ferreira Filipa , Yonova Ivelina , de Lusignan Simon
Published: October 2020

Background

National Health Service (NHS) England supports social prescribing in order to address social determinants of health, which account for approximately 80% of all health outcomes. Nevertheless, data on ongoing social prescribing activities are lacking. Although NHS England has attempted to overcome this problem by recommending 3 standardized primary care codes, these codes do not capture the social prescribing activity to a level of granularity that would allow for fair attribution of outcomes to social prescribing.

Objective

In this study, we explored whether an alternative approach to coding social prescribing activity, specifically through a social prescribing ontology, can be used to capture the social prescriptions used in primary care in greater detail.

Methods

The social prescribing ontology, implemented according to the Web Ontology Language, was designed to cover several key concepts encompassing social determinants of health. Readv2 and Clinical Terms Version 3 codes were identified using the NHS Terms Browser. The Royal College of General Practitioners Research Surveillance Centre, a sentinel network of over 1000 primary care practices across England covering a population of more than 4,000,000 registered patients, was used for data analyses for a defined period (ie, January 2011 to December 2019).

Results

In all, 668 codes capturing social prescriptions addressing different social determinants of health were identified for the social prescribing ontology. For the study period, social prescribing ontology codes were used 5,504,037 times by primary care practices of the Royal College of General Practitioners Research Surveillance Centre as compared to 29,606 instances of use of social prescribing codes, including NHS England’s recommended codes.

Conclusions

A social prescribing ontology provides a powerful alternative to the codes currently recommended by NHS England to capture detailed social prescribing activity in England. The more detailed information thus obtained will allow for explorations about whether outputs or outcomes of care delivery can be attributed to social prescriptions, which is essential for demonstrating the overall value that social prescribing can deliver to the NHS and health care systems.
COMPARISON OF MALASSEZIA SPP. PROPORTIONS IN INFLAMMATORY AND NON-INFLAMMATORY FACIAL ACNE VULGARIS LESIONS
Authors: SUTARJO AGASSI SUSENO , SITOHANG IRMA BERNADETTE S. , WAHID MARDIASTUTI H. , WIDATY SANDRA
Published: October 2020

Objective: The skin microbiome plays a role in the pathogenesis of acne vulgaris (AV). Among other species, Malassezia spp. can be found in the pilosebaceous follicle. However, its role on the pathogenesis of AV has not yet been described. The objective of this study was to identify the presence and the distribution of Malassezia spp. in facial AV lesions and also to compare the distribution of Malassezia spp. between inflammatory and non-inflammatory lesions.

Methods: One hundred and twenty subjects were allocated into two groups: inflammatory lesions and non-inflammatory lesions. Samples were taken from hair follicles and examined by microscopy using 20% potassium hydroxide and Parker ink and cultured for species identification.

Results: There was no difference in the spore load between the two groups (p=0.142). Malassezia spp. were isolated from 64.2% of subjects and consisted of M. dermatis (43%), M. sympodialis (18%), M. slooffiae (16%), M. japonica (5%), M. furfur (5%), M. pachydermatis (3%), and M. restricta (1%). There was a higher Malassezia spp. proportion in non-inflammatory lesions (p=0.019). The predominant species in inflammatory AV lesions was M. dermatis (45,8%), followed by M. sympodialis (17.1%), and M. slooffiae (11.4%).

Conclusion: Malassezia spp. were found in facial acne lesions. M. dermatis was the predominant species found in facial AV, followed by M. sympodialis, and M. slooffiae. A higher proportion of Malassezia spp. was found in non-inflammatory lesions.
THE EXPRESSION OF NESTIN IN THE INDUCED DIFFERENTIATION INTO NEURONS OF RAT BONE MARROW MESENCHYMAL STEM CELLS BY NEUROTROPHIN-3 (NT-3)
Authors: NOVIANTARI ARIYANI , ANTARIANTO RADIANA DHEWAYANI , RIF’ATI LUTFAH , RINENDYAPUTRI RATIH , ZAINURI MASAGUS , DANY FRANS
Published: October 2020

Objective: The aim of this study was to examine the role of NT-3 as a single neurotrophic factor in the expression of nestin in the neural differentiation of MSCs.

Methods: MSCs were isolated from rat bone marrow and induced with NT-3 at concentrations of 20, 25, and 30 ng/ml for 7 and 14 d (the control was no NT-3). Nestin underwent immunocytochemical analysis on days 7 and 14. Five high-power random fields were documented.

Results: A post-hoc analysis using LSD after one-way ANOVA test yielded a statistically significant difference in the percentage of nestin-positive cells in MSCs with NT-3 at concentrations of 20, 25, and 30 ng/ml for 7 d compared to the control group (p<0.05). The percentages of nestin-positive cells at concentrations of 20, 25, and 30 ng/ml, and in the control data on day 7 were 14.55±1.26%, 16.20±1.07%, 13.78±1.19%, and 9.81±0.79%, respectively. NT-3 at 25 ng/ml induced the highest MSCs neural differentiation on day 7 and remained constant until day 14.

Conclusion: NT-3 plays a role in the early stage of differentiating MSCs from rat bone marrow into neurons, with the optimal concentration being 25 ng/ml.
THE COMPARISON OF CONFIGURATION, DEGREE AND SITES OF OBSTRUCTION IN PATIENTS WITH SLEEP DISORDERED BREATHING: EXAMINATION USING DRUG-INDUCED SLEEP ENDOSCOPY, MUELLER MANEUVER AND POLYSOMNOGRAPHY
Authors: RIZKI NIKEN AGENG , TAMIN SUSYANA , FARDIZZA FAUZIAH , WARDANI RETNO S. , MARSABAN ARIEF , BARDOSONO SAPTAWATI , RACHMAWATI ELVIE ZULKA KAUTZIA
Published: October 2020

Objective: The purpose of this study is to evaluate the location, configuration, and degree of differences in upper airway obstruction between the Mueller Maneuver (MM) and Drug-induced sleep endoscopy (DISE), thus acquiring a better diagnostic value for SDB patients.

Methods: A cross-sectional and analytical descriptive study using retrospective secondary data to evaluate the location, configuration and degree of upper airway obstruction in SDB subjects using the Mueller Maneuver and DISE. Polysomnography (PSG) type 2 was used to determine the SDB degree.

Results: Subjects with SDB non-Obstructive sleep apnea (OSA) and OSA show a multilevel obstruction with a different location and configuration due to the various risk factors, such as nasal congestion, laryngopharyngeal reflux, obesity and menopause.

Conclusion: Statistical differences in upper airway obstruction configuration between MM and DISE were found in the level of the velum (p=0,036), oropharynx (p<0,001) and epiglottis (p=0,036) and were also found in the obstruction degree of the velum, oropharynx, tongue base and epiglottis with p=0,002; p<0,001; p<0,001 and p<0,001. No statistical difference was found on the lowest oxygen saturation between PSG and DISE (p=0,055).
THE VIABILITY TEST OF SAPPAN WOOD (CAESALPINIA SAPPAN L.) ETHANOL EXTRACT IN THE H9C2 CELL LINE
Authors: SULISTIYORINI IFA , SAFITRI RATU , LESMANA RONNY , SYAMSUNARNO MAS RIZKY A. A.
Published: October 2020

Objective: In this study, the embryonic rat cardiomyocyte cell line H9C2 was used to investigate the cardiotoxicity effect of sappan wood ethanol extract (SWEE).

Methods: Sappan wood was extracted in 96% ethanol and divided into dose concentrations of 2.5, 5, 10, 50, 100, and 150 μg/ml, with deferiprone used as a control. Cell viability was assessed using the PrestoBlue Cell Viability Reagent, according to manufacturer protocols.

Results: Microscopic examination showed that the cell viability of H9C2 was preserved by SWEE treatments at a dose of 10 μg/ml and suggested dose concentrations of 50 μg/ml of SWEE. The percentage of viable cells was greater than 95% with a dose concentration of 10 μg/ml of SWEE, but it was significantly reduced with a dose concentration of 50 μg/ml of SWEE (p<0.05).

Conclusion: The optimal dose concentration of SWEE to reach 95% cell viability was 10 μg/ml.
INCUBATION OF PLATELET-RICH FIBRIN MATRIX WITH MESENCHYMAL STEM CELLS IMPROVES MATRIX STIFFNESS
Authors: REKSODIPUTRO MIRTA H. , PRATAMA GITA , WIWEKO BUDI , KUSUMAWARDHANI EVANTHI , RAHAYU DENISWARI , NAULI RAISA , MARTIN VALENCIA JANE , SANDORA NORMALINA
Published: October 2020

Objective: The platelet-rich fibrin matrix (PRFM) is condensed platelet-rich plasma (PRP) and should possess a comparable biomechanical property to the transplanted sites, for them to be physiologically functional. The aim of this study was to investigate the effect of human bone marrow mesenchymal stem cells (hBM-MSC) or human umbilical cord mesenchymal stem cells (hUC-MSC) on the biomechanical properties of PRFM.

Methods: PRFM was prepared by the gelation of PRP using 25 mmol CaCl2. The resulting coin-shaped PRFM pellets, 5 cm in diameter and 300 μm thick, were directly seeded with hUC-MSC or hBM-MSC at 2,000 cells cm-2, followed by 24 h incubation at 37 °C in 5% (v/v) CO2 in air. The samples were then observed by scanning electron microscopy to determine the morphology of the matrix surface. The PRFM biomechanical properties were determined at a 10 mm. min-1failure rate using an MCT 2150 universal testing machine (AandD Co. LTD).

Results: SEM imaging of the surface of the PRFM seeded with hBM-MSC and hUC-MSC showed a cloudy layer that thickened over time. The elastin slope of the PRFM was significantly improved after seeding with hBM-MSC and hUC-MSC when compared with unseeded PRFM (p<0.002, R2=0.983). Both cell types elicited similar biomechanical effects (p=0.99).

Conclusion: PRFM seeded with hBM-MSC or hUC-MSC showed significantly increased elasticity.
Crises, desastres naturais e pandemias: contribuições da Psicologia Positiva
Authors: De Cassia Nakano Tatiana
Published: October 2020

Dado o caráter imprevisível das crises, pandemias e desastres, diversas consequências devastadoras em relação a saúde mental da população podem ser notadas após sua ocorrência. Por tal motivo, é importante compreender como a psicologia pode ajudar indivíduos e comunidades que experimentam um evento traumático. O presente texto irá enfocar as contribuições da psicologia positiva nesse contexto, dada a atualidade da temática perante a pandemia global provocada pelo COVID-19. Nesse sentido, o texto foi organizado de modo apontar como a aplicação dos construtos da psicologia positiva pode ser feita, considerando-se três fases: preparação para desastres, resposta a crises e fase de recuperação. A revisão da literatura demonstrou que a psicologia positiva pode possibilitar crescimento aos indivíduos, mesmo após a vivência de evento traumático, auxiliando-os a reformularem suas experiências negativas, refletirem sobre suas prioridades e reavaliarem seus valores.
The case for U.S. high speed rail
Authors: Stapleton Drew , Cooley Melissa , Goehner Darlene , Jandal Daloud
Published: October 2020

High-speed rail is a form of self-guided ground transportation, which utilizes steel-wheels or magnetic levitation (i.e., Maglev) and can travel in excess of 200 miles per hour. High-speed ground transportation (i.e., HSGT) has been widely used in Europe and Asia, but the debate continues over the usefulness of high-speed rail in the United States. Several metropolitan areas in the United States have been identified as corridors that would benefit from HSGT. High speed rail can offer an alternative or a compliment to over-the-road and air transportation. Initial investment cost for this mode of transportation are high, but other factors such as fewer emissions from trains help to balance these costs. This manuscript examines the feasibility of bringing high-speed rail to clusters of cities throughout the United States (i.e., corridors) for passenger and commercial freight transportation.
An examination of the impacts of transportation management systems
Authors: Rutner Stephen M , Gibson Brian J
Published: October 2020

There is a great deal of research regarding Supply Chain Management (SCM) and Logistics Information Systems (LIS). However, there has not been a recent examination of the current state ofTransportation Management Systems (TMS). This article provides an overview of the previous research and examines the current state of TMS and the relationships between these systems and other information systems in general. The results of over twenty years of LIS and TMS data are presented to highlight potential information gaps and significant relationships between TMS and other functions.
Balancing the logistics cost-of-service equation in an increasingly uncertain business environment
Authors: Dobie Kay , Wilson Jerry
Published: October 2020

The emphasis in the press, trade publications, and even academic publications is increasingly on supply chain operations, collaboration, and software. There is no argument that these are important considerations as companies struggle to compete in highly competitive markets and an economically difficult environment. This emphasis on “lean” or “JIT” operations presupposes the ability of the firm to operate on a minimum level of inventory and deliver a high level of service. Too often, the basic and vital interdependency between transportation and inventory, necessary to support this objective, is forgotten in the emphasis on the total picture as embodied by the supply chain. It has been said that “the devil is in the details.” It may be time for many firms to take another look at inventory, transportation and the cost of service.
The global supply chain: challenges and solutions
Authors: Johnson Carol J , Nuzum Paul
Published: October 2020

While there have been independent examinations of several of the changes that affect the supply chain, to date there has been little in the way of studies that holistically examine the changes facing front line supply chain managers today and the solutions they have implemented to address those changes. Supply chain executives have been interviewed in depth to better understand how manufacturing or distribution network changes, technology implementation, corporate re-structuring and/or increasing customer demands have been addressed in the field. An understanding of the challenges and successes faced by Global 1000 firms as they address these changes should help others in the field to better accomplish supply chain change.
Carrier selection criteria: differences among truckload motor carrier offerings
Authors: Kent John L , Smith Carlo D
Published: October 2020

Effective customer service begins with an understanding of the service components customers’ view as most important to their operations and business success. Within the transportation industry research has investigated the importance of such criteria at an industry level. This article offers detailed rankings of service criteria priority from a shipper’s perspective by comparing criteria across five types of motor carrier offerings including dry van, temperature controlled, intermodal, tank, and flatbed. Results identify the ranked importance of 20 service characteristics, common themes, and distinct differences in the importance of service criteria among the alternative supplier offerings.