bluuebunny/crossref_metadata_2025 huggingface dataset:
The Realization of Deixis in Studentsâ€™ Writing at Sekolah Tinggi Keguruan dan Ilmu Pendidikan Muhammadiyah Pringsewu Lampung
Authors: Astria Asri , Mujiyanto Januarius , Rukmini Dwi
Published: May 2022

Through the final product of writing, students can communicate their ideas, thoughts, and feelings to the reader. Deixis is one of the branches in pragmatics and one of the writing components that have to be noticed by the students to communicate the meaning in writing. This study is aimed at finding out the realization of deixis in studentsâ€™ writing text at STKIP Muhammadiyah Pringsewu Lampung, and also to explain the difficulties faced by the students and teacher roles to overcome the studentsâ€™ difficulties. The researcher uses descriptive qualitative in analyzing data. There are three methods which are used in this study; they are document, observation, and interview. The results of this study showed that the realization of person deixis is more dominant since the students as the writers position themselves as the main characters of their own stories. Place deixis was realized through demonstrative pronoun, English adverb, and English preposition. The use of the proximal form of place deixis is more dominant rather than the distal form of place deixis. Time deixis was realized through past time, present time, future time, and adverbial of time. Social deixis was also realized through relational social deixis (used in informal situation) and absolute social deixis (used in formal situation). The students used discourse deixis in the form of demonstrative this/that and discourse marker. Further, there were difficulties faced by students in using deixis and the methods that used by the teacher to overcome the studentsâ€™ difficulties. Hence, it is expected that the findings of this study can improve the studentsâ€™ knowledge in pragmatics and deixis in general; especially they will apply appropriate deixis in order to develop their writing abilities.
Shear performances of hybrid notch-screw connections for timber-concrete composite structures
Authors: Shi Benkai , Dai Yongqing , Tao Haotian , Yang Huifeng
Published: May 2022

This paper presents the push-out experimental results of hybrid notch-screw (HNS) connections for timber-concrete composite structures. A total of 7 groups of specimens were designed and tested. The experimental parameters included the loading constraint conditions (i.e., the test specimens were loaded either in local compression or in uniform compression), shapes of notches in the wood, screw number in notch, notch width, and the inclusion of a self-tapping screw reinforcement for timber or not. The experimental results were discussed in terms of failure modes, ultimate strength, slip moduli, and ductility. The yield strengths and ductility factors were determined based on the load-slip curves according to existing standards. The experimental results showed that both the shear timber width and the self-tapping screw reinforcement played important roles in terms of the ultimate strengths, ductility, and deformability. Rectangular notched connections with screw reinforcements displayed timber shear failure coupled with brittle failure. With the trapezoidal notch, the ductility of the connections improved, coupled with a decrease in the slip modulus. The self-tapping screw reinforcement for shear timber could greatly improve the ductility performance of the HNS connections. The slip modulus models for the connection with vertical deep notches were provided, which were in agreement with the experimental results.
Comparative analysis of dynamic changes in forest resources with RBF neural network and regression method
Authors: Wu Xiaoyu , Bao Qingfeng , Liu Guiyan
Published: May 2022

Forest resources are the most important natural resources; their dynamic changes (growth or decline) are affected by socio-economic factors, and to study their linkage is of great significance. However, the relationship between forest resources and social economic factors is normally a multivariate nonlinear relationship. There are difficulties in accurately analyzing it by using traditional multivariate-statistical methods. Also, its explicit mathematical model is inconvenient for intelligent management. In this paper, the radial basis function (RBF) neural network was introduced to study the relationship between the changes of forest resources and socio-economic factors and was evaluated by comparison with the traditional multiple-linear regression model. The results showed that the RBF neural network method can be applied in modeling the dynamic changes of forest resources and showed a higher prediction accuracy over the traditional statistical modeling approaches. At the same time, the RBF neural network can analyze and evaluate the importance of influencing factors simply and conveniently. The results provide a new way and show an application potential for the analysis and intelligent management in forest resources.
Parameter optimization of a biodegradable agricultural film manufactured with wheat straw fiber
Authors: Zhao Cheng-Shun , Zuo Peng , Wang Xing , He Yu-Ze , Chen Hai-Tao , Zhang Ying , Li Long-Hai
Published: May 2022

Straw fiber mulch film is a promising alternative to petroleum-based plastic mulching film. The optimal combination of process parameters during the manufacturing process of the wheat straw fiber-based plant fiber film (hereinafter referred to as film), was studied via a five-factor and five-level central composite design methodology. Response surface methodology was used to analyze the effects of sizing agent content, wet strength agent mass fraction, basis weight, KP pulp mixing ratio, and beating degree of wheat straw fiber on the dry tensile index, wet tensile index, and degradation time. The optimal parameters were as follows: a sizing agent content of 2.0%, a wet strength agent mass fraction of 60%, a beating degree of wheat straw fiber of 60 °SR, a basis weight of 54.6 to 60.8 g/m2, and a KP pulp mixing ratio of 37.6% to 44.7%. These parameters achieved the desired physical properties, i.e., a degradation time of 55 to 65 d, a dry tensile index of 10 to 12 N·m/g, and a wet tensile index 3.5 to 5.5 N·m/g. With the optimal manufacturing parameters, straw mulch film would meet the demands for agriculture.
Analytical investigation into the single shear performance of a joint with a new beech and self-tapping screw composite dowel
Authors: Qian Liang , Xue Yingying , Shen Jie , Gao Yuewen , Li Shengcai , Gao Ying , Yao Lihong , Gong Yingchun , Wang Zhiqiang , Ding Qingfeng , Zhu Xudong
Published: May 2022

The shear capacity was evaluated for specimens connected by beech dowels and composite dowels. The bearing capacities were calculated by the shear capacity formulas of metal dowel connectors in the GB 50005 (2017), NDS (2018), and EN 1995-1-1 (2014) standards. The results showed that, except for the specimen connected by one composite dowel calculated by the GB 50005 standard (2017), the remaining calculation differences were larger. Based on the failure mode, the force analysis of the beech dowels and the composite dowels was carried out. A calculation formula for the shear bearing capacity of the beech dowels and the composite dowels was proposed. The calculated results were in strong agreement with the test results, and the margins of difference were less than 10%. Furthermore, the formulas for two and four connectors were investigated. When the number of effective connectors was calculated by the GB 50005 standard (2017), the differences between the test values and the calculated values were less than 9.36%.
Effect of alkali and silane treatments on properties of green composites based on ramie fibers and cellulose acetate resin
Authors: Sun Ye , Xu Anchang , Chen Changjie , Luo Chao , Bao Limin
Published: May 2022

Green composites based on ramie fiber yarn and cellulose acetate resin were prepared via hot pressing. The ramie fiber yarns were treated with NaOH and 3-glycidoxypropyltriethoxysilane. The effect of surface treatment on the fiber adhesion to the resin surface and the mechanical properties of the green composites were studied. The chemical properties of the modified ramie fiber yarn were studied via Fourier-transform infrared (FTIR) spectroscopy. The adhesion performance between the fiber and resin was evaluated. The tensile strength of the composites was measured through tensile testing. A single-fiber tensile experiment was used to determine the influence of the tensile strength of the single fibers after surface-treatment. The surface morphology changes were observed via scanning electron microscopy. The results showed fiber–resin adhesion was improved by the surface treatments. However, the surface treatments negatively affected the single-fiber mechanical properties, with the alkali treatment causing greater damage than the silane treatment.
Detection and analysis of an eave purlin of the timber building eroded by carpenter bees based on computed tomography
Authors: Yang Xiaoxia , Gao Yisheng , Zhao Ziyu , Ge Zhedong , Liu Xiaoping , Zhou Yucheng
Published: May 2022

To explore the harm of carpenter bee nests to timber buildings, an eave purlin of Wu’s house, the seventh batch of national key cultural relics in China, was taken as the research object. A CT (computed tomography) device was used to collect the projection data of wood components, and VGSTUDIO MAX3.2 software was used to reconstruct multiple transverse sections, radial sections, tangential sections, and 3D (three-dimensional) images of an eave purlin. The results showed that carpenter bees eroded a timber building randomly, but they usually nested along the length of eave purlin. The wood in the middle of an eave purlin is more vulnerable to carpenter bees than the end. Carpenter bee nests are usually not connected, and the volume of nests accounts for 3% to 4% of the eave purlin. The eave purlin is applied with an orientation and a torsion force. The position of the maximum hot spots of the stress occurs at holes and the large cracks, indicating that carpenter bee nests have a great impact on the mechanical properties of timber buildings. The research results of this paper provide reference for the safety evaluation and preventive protection of timber buildings.
Aldehyde content of dialdehyde cellulose determined via nitrate analysis
Authors: Yu Ching-Len , Jhong Ming-Yan , Lin Feng-Qing , Chen Meng-Nan , Wang Guan-Mao
Published: May 2022

Dialdehyde cellulose was synthesized via the heterogeneous periodate oxidation of microcrystalline cellulose in an aqueous solution. The aldehyde content of the dialdehyde cellulose was determined via nitrate analysis based on a two-step sequential approach. The approach first employed hydroxylamine to react with the aldehyde groups and to produce oxime groups via Schiff’s replacement reaction. Then, the oxime groups were oxidized via persulfate to produce nitrate. The nitrate concentration was analyzed via two highly sensitive methods, i.e., ion chromatography and ultraviolet light absorption. The aldehyde content was approximately one-fifth of the theoretical value. The resulting aldehyde groups were found primarily distributed over the surface layers. A solubility parameter calculation suggested that the increase of the aldehyde groups caused the detachment and dissolution of the dialdehyde cellulose chains and consequently led to the determination of a relatively low aldehyde content.
Chemical component characterization and potential medicinal utilization of extracts and pyrolyzates from Jasminum nudiflorum Lindl. wood
Authors: Gu Haiping , Liu Yuhao , Yan Jie , Yu Xuewei , Li Yiyang , Li Cheng , Peng Wanxi
Published: May 2022

Utilization of lignocellulosic biomass is receiving increasing attention lately. In this study, Jasminum nudiflorum Lindl. (JNL) wood were extracted using methanol, ethanol, and benzene/ethanol (2:1, v:v) separately. Fourier transform-infrared spectroscopy (FTIR) and gas chromatography-mass spectroscopy (GC-MS) were used to study the chemical components of extracts. A thermogravimetric (TG) analyzer and pyrolysis (Py)-GC-MS investigated the characteristics of thermal loss law and pyrolyzates of JNL wood, respectively. The FTIR results showed that many functional groups were detected from the extracts of JNL wood, which were consistent with the chemical structures in the components detected by GC-MS. There were two obvious stages of thermal loss for removing moisture and decomposition of the organic constituents. The components of the extracts and pyrolyzates were esters, acids, aldehydes, alcohols, inositol, furfural, alkanes, phenols, ketones, antibiotics, saccharides, and glycosides. Among them, some components, such as ethyl iso-allocholate, scopoletin, isosorbide dinitrate, and idebenone, have high medicinal value. This study revealed the chemical component characterization and potential medicinal utilization of JNL wood. It provides the scientific basis for enhancing the utilization value of JNL wood.
Model composition heat-resistant materials for multifunctioal coating
Authors:   Yangel Yuzhnoye State Design Office, Husarova I. O. , Potapov O. M. ,   Yangel Yuzhnoye State Design Office, Gorelov B. M. ,   Chuiko Institute of Surface Chemistry, Manko T. A. ,   Oles Honchar Dnipro National University, Frolov G. O. ,   Frantsevich Institute for Problems of Materials Science NAS of Ukraine
Published: May 2022

A schematic diagram of composite material for a heat-resistant multifunctional coating providing radio invisibility and thermal protection of parts of missiles is proposed. Organosilicon binder KO-08K, inorganic binder НС-1A, and heat-resistant mastic NEOMID-TITANIUM were researched to select the materials of the heat-resistant matrix. Based on the analysis of the results of thermal desorption spectrometry of organosilicon binder and mastic NEOMID-TITANIUM with heat-resistant fillers, it was found that the thermal destruction is most effectively reduced by the matrix filler with perlite and aluminum. The efficiency of the selected composites at a high rate of temperature change was evaluated by the heat stroke method. It was revealed that samples based on the organosilicon binder with fillers failed to provide the required heat resistance of the material: NEOMID-TITANIUM mastic can be used in case of filling with 2 % of aluminum and aluminum-silicate binder HC-1A in the case of filling with 5 % aluminum and 10 % mullite. Selected materials were tested in a jet of a gas-dynamic burner. The results confirmed the need to reinforce the matrix with heat-resistant fabrics to increase its strength and erosion resistance. Heat-resistant silica fabric KT-11 and silica heat-resistant tape LKA-1200 were used as heat-resistant radio-transparent reinforcing fabric fillers. Thermo-erosion tests of reinforced samples in the jet of a gas-dynamic burner showed that the minimum linear removal was obtained on samples with a matrix based on NEOMID-TITANIUM mastic, which was reinforced with KT-11 fabric (outer layer) and LKA-1200 tape, which allows using these materials to create the multifunctional coating.
Dengue: A Growing Problem With New Interventions
Authors: Wong Joshua M. , Adams Laura E. , Durbin Anna P. , Muñoz-Jordán Jorge L. , Poehling Katherine A. , Sánchez-González Liliana M. , Volkman Hannah R. , Paz-Bailey Gabriela
Published: May 2022

Dengue is the disease caused by 1 of 4 distinct, but closely related dengue viruses (DENV-1–4) that are transmitted by Aedes spp. mosquito vectors. It is the most common arboviral disease worldwide, with the greatest burden in tropical and sub-tropical regions. In the absence of effective prevention and control measures, dengue is projected to increase in both disease burden and geographic range. Given its increasing importance as an etiology of fever in the returning traveler or the possibility of local transmission in regions in the United States with competent vectors, as well as the risk for large outbreaks in endemic US territories and associated states, clinicians should understand its clinical presentation and be familiar with appropriate testing, triage, and management of patients with dengue. Control and prevention efforts reached a milestone in June 2021 when the Advisory Committee on Immunization Practices (ACIP) recommended Dengvaxia for routine use in children aged 9 to 16 years living in endemic areas with laboratory confirmation of previous dengue virus infection. Dengvaxia is the first vaccine against dengue to be recommended for use in the United States and one of the first to require laboratory testing of potential recipients to be eligible for vaccination. In this review, we outline dengue pathogenesis, epidemiology, and key clinical features for front-line clinicians evaluating patients presenting with dengue. We also provide a summary of Dengvaxia efficacy, safety, and considerations for use as well as an overview of other potential new tools to control and prevent the growing threat of dengue.
Estudio metalúrgico de causas de falla del puente pescadero
Authors: Hernández Héctor , Delgado Héctor
Published: May 2022

Se trata de un puente en arco de una sola luz de 120 m, el cual colapsó después de 10 años de servicio. Con base en elementos estructurales extraídos del puente de falla, se realizó un estudio fractografico, mecánico y químico, con el fin de establecer las posibles causas de fallas del puente desde el punto de vista metalúrgico. En nudos de unión de pendolón-arco se observan fracturas por fatiga en uniones soldadas en varios sitios, lo cual es evidenciado por una apariencia de fractura suave de crecimiento estable de grietas combinada con una zona de apariencia fibrosa de fractura súbita final de colapso del puente. Dado que el colapso del puente es precedido por la generación de grietas en uniones soldadas, se considera importante examinar la combinación de las propiedades de resistencia y tenacidad con el fin de estudiar tanto la capacidad de soporte de carga como de la tolerancia de defectos de las uniones soldadas.
Fundamentos de computación con ADN
Authors: Ortíz Triviño Jorge Eduardo , Rojas C. Carlos Clemente
Published: May 2022

Este artículo presenta algunas ideas básicas para resolver problemas computacionales complejos, mediante el empleo de la estructura biológica del ADN y técnicas especializadas de laboratorio. Las características del ADN que se describen hacen posible codificar estructuras matemáticas, como las máquinas de Turing o las redes neuronales; para ello, la clave está en la interpretación del ADN como un generador de lenguajes.
Aproximación metodológica a las aplicaciones del CORBI-IBUN en la Universidad Nacional
Authors: Cortés Amador Carlos
Published: May 2022

El principal objetivo de este artículo es describir lo que se llama la metodología de prototipos para la obtención de productos informáticos. Aunque ésta ha sido modificada, en este trabajo se hace mención de la versión actual que se utiliza en el proyecto interdisciplinario CORBI (Centro de Orientación y Referencia en Biotecnología e Informática del IBUN, Instituto de Biotecnologia de la Universidad Nacional).
Apartes desde la inteligencia artificial
Authors: Torres Soler Luis Carlos
Published: May 2022

El estudio y desarrollo de la inteligencia artificial no debe centrarse sólo en la creación de software o hardware que permita realizar procesos algorítmicos o heurísticos en el computador, de tal forma que produzcan soluciones óptimas y eficientes al resolver un problema complejo, ya sea de manejo de información o de toma de decisiones, o crear máquinas que tengan buena apariencia del ser humano; se debe, sobre todo, analizar la parte neurológica y psicológica que presenta el individuo al solucionar problemas. Además, es importante conocer la capacidad intelectual de la persona, de ahí la variedad de carreras profesionales que existen; no puede quedar por fuera de los sistemas inteligentes la concepción del amor o admiración.
Catalizadores de Pt / γ-Al2O3 con distribución no Uniforme. Estudio Teórico y Experimental
Authors: Ardila Jacqueline , Carballo Luis M.
Published: May 2022

Una serie de catalizadores de Pt / γ-Al2O3 se prepararon por impregnación simultánea y secuencial por vía húmeda, con ácido hexacloroplatínico como precursor catalítico y ácido cítrico como competidor. Las concentraciones de los ácidos hexacloroplatínico y cítrico se mantuvieron constantes durante la preparación de los catalizadores y el tiempo de impregnación se varió entre 2, 6 y 12 horas. Un estudio de microscopía electrónica se realizó para el grupo de catalizadores, el cual determinó el tipo de perfil y distribución, y algunas diferencias entre los dos tipos de impregnación. Para la impregnación simultánea se planteó un modelo matemático que predice los perfiles de concentración de Pt dentro del soporte. Se consideró un mecanismo de adsorción competitiva del tipo Langmuir entre el ácido hexacloroplatínico y el ácido cítrico. La distribución y el tipo de perfil encontrados por el modelo concuerdan con los resultados obtenidos experimentalmente.
Desarrollo de un catalizador sólido de carácter ácido. 3. Actividad y cinética
Authors: Gómez García Miguel Ángel , Vargas Watson L.
Published: May 2022

La esterificación del ácido acético con metanol utilizando como catalizador un óxido metálico sulfatado es conducida en un reactor Batch. Se comparan los resultados contra los obtenidos para catalizadores comerciales: ácido sulfúrico, y las resinas Amberlyst 15 y Purolite CT-124. Para el catalizador con mejor actividad, se realiza la reacción a diferentes niveles de temperatura, con el fin de determinar los parámetros cinéticos de la ecuación de velocidad. Los datos cinéticos pueden ser descritos por una expresión de velocidad basada en una reacción bimolecular reversible. Del análisis lineal y no lineal se concluye la importancia de considerar el fenómeno de adsorción sobre la superficie catalítica. Las bondades del catalizador son expuestas y discutidas.
La Ingeniería Agrícola a través del tiempo
Authors: Ospina M. Julio E.
Published: May 2022

Presenta una descripción histórica de la Ingenieria agrícola
Metodología de los escenarios para estudios prospectivos
Authors: Cely B. Alexandra V.
Published: May 2022

Existen diferentes formas de aproximarse al futuro, siendo la prospectiva la única que lo aborda como una realidad múltiple e indeterminada, obtenida como resultado de las infinitas posibilidades de acción humana, reflejada en los diferentes proyectos (acciones concretas), anhelos y temores de los grupos sociales. Para desarrollar estudios de prospectiva existen diferentes metodologías entre las que se encuentra la de escenarios, cuyo uso se ha venido generalizando durante los últimos diez años gracias a la claridad en la presentación de los resultados y a la articulación de los mismos con la intencionalidad de la acción humana.
Esta metodología se desarrolla en tres fases: análisis estructural, análisis del juego de actores y elaboración de escenarios, cuyo propósito es analizar el fenómeno en estudio desde un punto de vista retrospectivo y actual, teniendo en cuenta la influencia de los grupos sociales gestores de su desarrollo para, posteriormente, presentar la realidad futura en forma de escenarios. En este artículo se pretende hacer una descripción clara y detallada de dicha metodología, así como de las diferentes herramientas que utiliza.
Aplicaciones de la lógica difusa
Authors: Duarte V. Oscar G.
Published: May 2022

El propósito de este artículo es el de presentar algunas de las aplicaciones conocidas de la Lógica Difusa, es por tanto un artículo de carácter divulgativo para no expertos en el tema. Los ejemplos seleccionados son un Controlador Difuso Adaptativo, un Identificador de Imágenes Aéreas que emplea un algoritmo de agrupamiento difuso, una Base de Datos Difusa, y un experimento de psicología cognoscitiva inspirado en la lógica difusa. Todos estos ejemplos han sido tomados de la literatura técnica.
Puentes tipo Compac 200 colgantes de 39 y 66 metros de luz
Authors: Otálora Torres Oscar Eduardo
Published: May 2022

En algunas vías colombianas se han venido utilizando puentes metálicos desarmables tipo COMPAC 200 que, para luces mayores a 40 metros, se refuerzan colgándolos de cables. Este tipo de utilización no es como el diseño original, sin embargo, la práctica ha demostrado que funcionan, sobretodo cuando se presentan necesidades como comunicar urgentemente entre si diferentes regiones. Por ejemplo, cuando ha habido la ruptura de un puente permanente en una carretera ya construida y se hace necesario dar una solución rápida y eficaz para el pronto restablecimiento de las comunicaciones viales de la región.
El caso desarrollado en el presente trabajo trata el estudio de los puentes Compact 200 de las siguientes longitudes: 39m y 66m. Se hizo una generación de modelos de cada uno de los puentes utilizando el programa COSMOS/M.
Árboles de Juegos
Authors: Becerra Correa Nelson R.
Published: May 2022

El presente artículo hace una descripción sobre los arboles de juegos, se presentan los conceptos básicos y se reportan los resultados de un trabajo de investigación sobre el procedimiento minimax con corte alfa-beta aplicado a dichos árboles.
Departamento de Ingeniería Civil: pasado, presente y futuro
Authors: Camargo Valero Miller Alonso , Cubillos Peña Carlos Eduardo , Acosta García Rubén Darío
Published: May 2022

Se presenta una reseña histórica del Departamento de Ingeniería Civil de la Universidad Nacional de Colombia
Nuevo enfoque para el estudio de la productividad en la construcción masiva de vivienda
Authors: Arcudia Abad Carlos Enrique , Solís Carcaño Rómel Gilberto , González Fajardo José Antonio
Published: May 2022

La investigación de la productividad de la mano de obra puede ser un medio que coadyuve al incremento del nivel de vida y de las condiciones de trabajo de los obreros. En este trabajo se aplica el Modelo de los factores para el estudio de la productividad del trabajo en la industria de la construcción, en cuatro proyectos de vivienda masiva del tipo de interés social. Se realizaron mediciones de los trabajos efectuados en cuatro proyectos por sendas cuadrilla en el concepto muro a base de bloques de concreto. Los datos obtenidos se analizaron con apoyo en la teoría para la evaluación de la productividad de la mano de obra, que se fundamenta en el concepto de la línea base de cada proyecto, la cual está relacionada básicamente con la complejidad del diseño. Esta relación se establece por medio de un modelo de regresión.
Se definen dos índices con el objeto de medir la calidad en la ejecución de los trabajos: el índice de días de bajo ritmo (IBR) y el índice de administración de proyecto (IAP). El primero mide el porcentaje de días de trabajo anormal o de baja productividad, y el segundo remueve la influencia del diseño en la medida de la productividad para mostrar el efecto de la organización y administración de la obra.
Se desarrolla una metodología para la comparación de los cuatro proyectos, usando las curvas de probabilidad acumulada de IBR e IAP encontrándose que un proyecto dado puede presentar mejor desempeño en su ejecución, a pesar de tener cuantitativamente menor productividad, considerando la complejidad del trabajo por ejecutar.
Analysis of contamination in liquids hydrocarbons transport for pipes
Authors: Zárate Neira Eddy Ricardo
Published: May 2022

Pipeline contamination is usually understood to mean both the mixing effect produced when two different products transported by the same pipeline come into contact with each other and often the product of such mixing, as well. This product is often referred to as “contamination” or as “interface”. Clearly such intermixing is generally less serious in crude carrying, pipelines where each batch can become somewhat polluted by the batches immediately preceding and immediately following without significant damage. However, the situation is different in a finished products pipeline, which may carry products as different as aircraft gasoline and light fuel oils.
This article presents a brief description of the main factors influencing contamination with the objective of optimize conditions operating and to drive the more important respects about them.
Medical station for image processing and visualization of the brain electrical activity on a three-dimensional reconstruction of the patient's head
Authors: Forero Manuel Guillermo , Zuluaga Duvier
Published: May 2022

This paper presents a review of some researchs in the computer graphics field conducted by OHWAHA to solve medical problems. Particularly a framework to generate a three-dimensional human head model from a stack of brain images obtained by magnetic resonance is introduced. The envisaged system is suitable to display on the 3D head model the brain electrical activity obtained from electroencephalography.
Simulation and evaluation of ad hoc networks under different mobility models
Authors: Ortíz Triviño Jorge Eduardo , Bobadilla Molina Jaime Leonardo , Saumett León Miguel Arnulfo
Published: May 2022

In the performance evaluation of a protocol for an ad hoc network, the protocol should be tested under realistic conditions including realistic movements of the mobile users (a mobility model). In this paper we revise several mobility models used in the simulations of mobile networks including mobility models that represent mobile nodes whose movements are independent of each other and mobility models that represent mobile nodes whose movements are dependent on each other (group mobility models). We present simulation results in NS-2 that illustrate the importance of choosing a mobility model in the simulation of a mobile network protocol. Specifically, we illustrate how the performance results of an ad hoc network protocol drastically change as a result of changing the mobility model simulated.
Alternatives for clarifying glucose syrup obtained by enzymatic hydrolysis of starch
Authors: Castellanos Domínguez Óscar Fernando , Cruz Guerrero Gloria Teresa , González Blair Gloria Helena , Rentería Ayala Andira Yesil
Published: May 2022

The present paper studies some routes for separating and purifying glucose syrup obtained by enzymatic hydrolysis of potato starch. The clarifying process is done in three stages. The first one (solids remotion) is done by applying conventional solid-liquid separation techniques such as sedimentation, centrifugation and filtration, as well as studying the effect of using flocculant and coagulant agents, prior to the already mentioned operations. Purification is done by adding decoloring agents, followed by ultrafiltration of the syrup. The last step (concentration) is done by vacuum evaporation. The results showed that separation, centrifuging and sedimentation reached 50% yield whilst filtration and ultrafiltration achieved 78% and 98% respectively. It was found that adsorbent agents such as activated carbon and diatomaceous earth were effective in removing color during the purification stage. The most suitable alternative for separation can be suggested from the foregoing, allowing a syrup to be obtained having similar characteristics and properties to the commercial product. The most appropriate technological module for carrying out the operation is also represented.
Ethanol dehydration
Authors: Uyazán Ana María , Gil Iván Dario , Aguilar J. L. , Rodríguez Niño Gerardo , Caicedo Luis Alfonso
Published: May 2022

This review outlines ethanol dehydration processes and their most important characteristics. It also deals with the main operating variables and some criteria used in designing the separation scheme. A differentiation is made between processes involving liquid-steam balance in separation operations and those doing it by screening the difference in molecule size. The last part presents a comparison between the three main industrial processes, stressing their strengths and weaknesses from the operational, energy consumption and industrial services points of view.
Production of protease with Bacillus megaterium DSM32: Partial characterisation of the enzyme and modelling of the production
Authors: Coban H.B.
Published: May 2022

Proteases hold an important position in today's world commercial enzyme market. Among various microbial producer genera, Bacillus is leading the commercial protease production. However, industry is still actively looking for new microbial protease producers with distinctive properties. Therefore, this study was undertaken for the evaluation of protease production by Bacillus megaterium DSM 32 strain in terms of its protease productivity, calculation of various production kinetics, partial characterisation of the enzyme, and modelling the protease production process. As results, the highest protease activity, specific cellular protease production rate, and protease productivity were calculated as 255.42 U mL−1, 36.2514 U g−1, and 16.1313 U mL−1 h−1, respectively, in shake flask fermentations. Partial characterisation studies showed that the enzyme has 45 °C and pH 8 as optimum working conditions, and its activity increased by 24% with the addition of 5 mM Mn+2 to the reaction medium. Additionally, the enzyme showed high stability and kept almost full activity in a cell-free medium for 20 days at 4 °C. Furthermore, modified Gompertz model provided the best fit in describing protease production with the lowest error and high fit values.
New records of three lace bug species from Laos (Hemiptera, Heteroptera, Tingidae)
Authors: Souma Jun , Cho Geonho , Lee Seunghwan
Published: May 2022

We report from Laos for the first time two genera and three species of lace bugs (Hemiptera, Heteroptera, Tingidae). This brings the number of tingids reported from Laos to 25 genera and 32 species. The two genera are Eritingis Drake & Ruhoff, 1962 and Haedus Distant, 1904, and the three species are Eritingis recentis (Drake & Poor, 1937), Haedus vicarius (Drake, 1927), and Trachypeplus jingae Dang, Guilbert & Bu, 2013.
Persicaria barbata (L.) H. Hara and Persicaria glabra (Willd.) M. Gómez (Polygonaceae): two newly recorded species from the Yucatan Peninsula and Mexico
Authors: Ortiz-Díaz Juan Javier , Ancona Juan José , Tun-Garrido Juan
Published: May 2022

Two species of Persicaria (L.) Mill. are reported for the first time in the Neotropics. Persicaria glabra (Willd.) M. Gómez is reported for the first time as part of the flora of the Yucatan Peninsula, Mexico, and Persicaria barbata (L.) H. Hara is newly recorded from Mexico and the Americas. We present morphological descriptions of these two species along with figures, a distribution map, and a dichotomous key for the identification of the six species of Persicaria from the Yucatan Peninsula.
Excitonic Susceptibility Function in Semimetal/semiconductor Materials: Formation of the Excitonic Condensate State
Authors: Do Thi Hong Hai , Nguyen Thi Hau
Published: May 2022

The condensate state of excitons in semimetal/semiconductor materials has been considered by analyzing the excitonic susceptibility function in the 2D extended Falicov-Kimbol model including electron-phonon interaction. The excitonic susceptibility in the system has calculated by using the Hartree-Fock approximation. From numerical results, we have set up phase diagrams ofthe excitonic condensate state. Phase diagrams confirm that the electron-phonon coupling plays an important role as well as the Coulomb attraction does in establishing the excitonic condensed phase at low temperature. The condensate phase of excitons is found within a limited range of the Coulomb attraction as the electron-phonon coupling is large enough. Depending on theelectron-phonon coupling and the Coulomb attraction, the BCS-BEC crossover of the excitonic condensation phase has also been pointed out.
A combined approach for sustainable use of mountainous agricultural land: land suitability evaluation and ecological-economic model
Authors: Hoang Thi Huyen Ngoc , Nguyen Manh Ha , Bui Quang Dung
Published: May 2022

In the quest for poverty reduction, developing sustainable agriculture and stabilizing cultivation areas for specialty plants can be substantially improved by a new approach, which combines land suitability assessment and designs of ecological-economic models. The land suitability was assessed according to the FAO framework and the Vietnamese standard TCVN-8409:2012. The criteria were grouped in the parameters of climate, topography, and soil physicochemical properties. The seven land utilization types selected for analysis included orange, banana, tea, turmeric, cinnamon, chinaberry, and chukrasia in mountainous regions of Thanh Hoa and Nghe An Provinces, Vietnam. The results showed that the most suitable lands (S1) for cultivating these crops were 169.916 ha for orange, 201.166 ha for banana, 107.636 ha for tea, and 570.744 ha for turmeric, 233.987 ha for cinnamon, 633.306 ha for chinaberry, and 280.704 ha for chukrasia. Based on that foundation, the study designed three ecological models with economic efficiency and elaborated on six formations of the models. The analyses obtained from the research also allowed the proposal of six prioritized spaces for land use and environmental protection, which were illustrated on a 1:100,000 map of proposed agricultural land use. Therefore, this study provided a detailed and reliable approach for researchers and managers in agricultural land use planning. A proper procedure for the assessment of agricultural land in mountainous areas can be suggested from this research.
Strategic Planning of Recreational and Tourism Sector Development of Perm Krai in Conditions of Restrictions
Authors:   Perm Institute (Branch) Plekhanov Russian University of Economics, Oborin Matvey
Published: May 2022

Development of the tourist and recreational sphere of the country’s regions is one of the points of economic recovery in the post-pandemic period, the importance of which is increasing in terms of stimulating domestic tourism in the country. Perm Krai has the necessary potential to increase its competitive advantages as a center of tourist and recreational services among the regions of the Volga Federal District, since it is consistently among the top three regions in terms of financial and economic indicators of sanatorium treatment. According to expert estimates, this direction will recover at more quickly accompanied by state support measures. However, with the continuing risks of restrictions the need for strategic planning of this activity increases significantly. The article presents the competitive advantages of tourist and recreational industry of Perm Krai. The study used general logical research methods, system and situational approaches, simulation of economic processes. The analysis of the problems of tourism development of Perm Krai is carried out, the limitations and promising directions of its further growth are determined. A model of tasks and solutions for the development of promising tourist territories is presented, which allows to situationally assess the state of tourism in the region, the dynamics and results of its development, as well as make changes to market regulation, if necessary. Further development of scientific research in this area should be associated with the adjustment of existing tools and mechanisms at the regional level to situational problems of the functioning of tourist and recreational industry of Perm Krai. The formation of a cluster framework of territories should be organically combined with support measures in conditions of restrictions, which may subsidies and compensation for labor costs, preferential loans, tax holidays.
The meaning of patient safety for nursing students
Authors: Oliveira Hyana Kamila Ferreira de , Silva Nair Chase da
Published: May 2022

ABSTRACT Objective: To understand the meanings attributed to patient safety by nursing students. Methods: Descriptive study of qualitative approach, based on the theoretical-methodological proposal of Symbolic Interactionism, conducted with 12 students completing the nursing course of a public higher education institution in a city in the state of Amazonas. The data were collected through a semi-structured interview. For interpretation of the results, it was used thematic analysis. Results: The meanings attributed by the students to patient safety are: the reduction of harm, the guarantee of the integrity of the patient, family members, and health professionals, the promotion of health through the knowledge acquired in the academy, the attitude of the professional and the practice. Final considerations: The meanings originated are in line with the literature produced; however, the students have knowledge gaps that enable patient safety development in their academic training and as nurses.
‘En el barco había más personas que huían como yo,’ itinerarios diaspóricos del África Occidental en América Latina
Authors: Ortega Pedro Roa
Published: May 2022

Resumen A partir de entrevistas etnográficas, este trabajo es un breve estudio de caso sobre los flujos de movilidad humana transnacional provenientes del África occidental que en años recientes llegan a la frontera norte de México. Primero, se presenta un panorama general del contexto desencadenante: la consolidación de contextos de violencia sociopolítica institucionalizada. Después, se detallan las características del tránsito: sus inconsistencias y ambigüedades. Desde una perspectiva diaspórica, el texto enfatiza la relevancia de las redes y las relaciones sociales que hacen viables trayectorias transatlánticas e intercontinentales, pese al afianzamiento global de regímenes de securitización fronteriza.
“We need a fence!” The spectacle of border militarization in Israel and in the USA
Authors: Simonneau Damien
Published: May 2022

Abstract. This article presents an analysis of the contemporary phenomenon commonly referred to as the “multiplication of walls”, namely the militarization of borderlands. It considers border enforcement as a policy solution about mobility portrayed as “undesirable”, propounded by politicians, security professionals and citizens’ groups for their own political benefit and interest. The “wall” is thus apprehended through a political spectacle intended for fenced-in citizens. To dissect the wall spectacle, the article resorts to an international comparison in two different geopolitical cases. The comparison specifically focuses on mobilizations in favor of “border/security fences” in Israel from 2001 and Arizona (USA) from 2010. It identifies three analogous political operations led by these actors (problematization of mobility, securitization into a military response and publicization of pro-fence narratives), and thus characterizes the manufacture of border militarization from a bottom-up perspective, while illustrating their national variations.
Os imigrantes e a cidade de São Paulo: modos de interação e sociabilidade
Authors: Escudero Camila
Published: May 2022

Resumo Este artigo tem como objetivo principal investigar os modos de interação e sociabilidade de imigrantes de origem latino-americana que vivem na cidade de São Paulo, contexto de maior presença migratória internacional no Brasil. Para isso, fizemos uso da técnica de pesquisa de observação-participante, acompanhando o desenvolvimento de veículos de comunicação de seis grupos, coletivos e associações de imigrantes, durante cerca de um ano. Como recurso teórico-metodológico, adotamos a ideia de comunicação como vínculo, trabalhada por Sodré (2014), em diálogo com o conceito de mediador, de Gilberto Velho (2010), em uma perspectiva interdisciplinar que une os campos da Comunicação e Antropologia. Os resultados apontam para a forma como se constituem as relações sociais na cidade por meio da convivência no espaço comum, bem como para a composição de significados compartilhados em um nível sociocultural.
Polimorfismos e necrose avascular em pacientes com doença falciforme – Uma revisão sistemática
Authors: Leandro Márcio Passos , Almeida Natália Damasceno , Hocevar Lara Santana , Sá Cloud Kennedy Couto de , Souza Amâncio José de , Matos Marcos Almeida
Published: May 2022

Resumo Objetivo: Estabelecer, de modo sistemático, se existe associação entre polimorfismos e a necrose avascular em pacientes com doença falciforme. Fontes de dados: A revisão, conduzida segundo as diretrizes Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) e registrada no International Prospective Register of Systematic Reviews (PROSPERO), foi baseada na busca de estudos nas bases de dados PubMed, Scientific Electronic Library Online (SciELO), Literatura Latino-Americana e do Caribe em Ciências da Saúde (LILACS), Biblioteca Virtual em Saúde (BVS) e na literatura cinza (Google Scholar e Open Gray) até junho de 2020. A análise da qualidade dos artigos foi baseada nos critérios do Strengthening the Reporting of Observational Studies in Epidemiology (STROBE). Síntese dos dados: Dez artigos foram selecionados nas bases de dados e dois incluídos por meio da busca manual, totalizando 12 estudos elencados. As amostras resultaram em 2.362 pacientes incluídos. Com base na iniciativa STROBE, sete estudos atenderam total e/ou parcialmente mais de 70% dos itens essenciais e dois atingiram menos que 60% deles, com variação geral de 86,4–54,5%. Os resultados mostram que os polimorfismos nos genes da proteína morfogenética óssea 6 (BMP6), da Klotho (KL) e da Anexina A2 (ANXA2) podem ter associação com osteonecrose no contexto da doença falciforme. Seis artigos estudaram o polimorfismo no gene da enzima MTHFR, mas apenas um obteve associação positiva. Os polimorfismos associados ao receptor DARC, ao gene ITGA4, ao CD36 e aos genes de proteínas trombofílicas não demonstraram associação em nenhum dos estudos. Conclusões: Os polimorfismos nos genes BMP6, KL e ANXA2 estão possivelmente associados com a necrose avascular em indivíduos com doença falciforme. Entretanto, para a confirmação dessas alterações genéticas como fatores de risco, é necessário que mais estudos com maior poder estatístico e com maior rigor metodológico sejam realizados.
Evaluation of quality of the children’s menu in mall’s restaurants
Authors: Duarte Caroline Barboza , Spinelli Monica Glória Neumann , Matias Andrea Carvalheiro Guerra
Published: May 2022

Abstract Objective: To evaluate the quality of children’s menus in restaurants located in shopping malls. Methods: To select the sample, restaurants from 30% of shopping malls in each region of the city of São Paulo were included and, after considering only one restaurant per chain, the total was limited to 151 restaurants, 30.2% of which (n=35) presented a children’s menu. Data were collected through a form on Google Forms. Results: Of the restaurants with children’s menu, 60% (n=21) were conventional restaurants and 40% (n=14) takeaway/fast-food. The large number of chains present in most visited malls showed a democratization of the way of eating, with popular and accessible menus, regardless of social status. Most of the analyzed foods were cooked (41.5%). Most preparations did not use grease in their preparation and there was a notable lack of fruit and vegetables (FV) (4%). Sweet desserts were offered in 11.4% of the places and 20% included gifts with meals. Conclusions: The scarce offer of children’s menus, few options and low FV offer indicate the need for a new look at the development of children’s menus and a greater integration between the possibilities of restaurants and the expectations of parents and children, in the challenge of integrating the relationship between the supply of new foods that promote healthier habits and their consumption.
The Intersubjective Nature of Meaning in Bakhtin and Wittgenstein
Authors: Gonçalves Mateus Toledo
Published: May 2022

ABSTRACT This article aims at comparing the philosophies of language of Bakhtin and Wittgenstein. The main problem to be addressed is how these two authors thought the idea that linguistic meaning necessarily has an intersubjective nature. To this end, the article will address the Wittgensteinian “private language argument,” as discussed in Philosophical Investigations, particularly in §258, and the Bakhtinian thesis of the “dialogical orientation of discourse,” as discussed at the beginning of chapter 2 of Discourse in the Novel.