bluuebunny/crossref_metadata_2025 huggingface dataset:
Students’ Perceptions of Involvement in the Assessment of Oral Competence in English as a Second Language
Authors: Sandvik Lise Vikan , Sommervold Oda Aasmundstad
Published: December 2021

This mixed-method study examined students’ perceptions of involvement in the assessment practice of oral competence in English in Norwegian upper secondary schools. Student involvement in assessment can be seen as a key factor when it comes to enhancing students’ learning outcome and motivation. Previous research has, however, shown that student involvement and the assessment of oral competence in English as a second language classes have been challenging. Surveys (N = 116) and two focus group interviews (N = 8) were used. The findings revealed that the students wanted to be more involved in the assessment practice. Moreover, the students saw this increased involvement as a way to enhance their oral competence in English. The students expressed uncertainty as to what they were assessed by. The implications of this study suggest that increased involvement in developing goals and criteria and more dialogue-based feedback are beneficial measures for strengthening students’ learning outcomes.
Intra- and Interorganizational Barriers to Blockchain Adoption: A General Assessment and Coping Strategies in the Agrifood Industry
Authors: Treiblmaier Horst , Rejeb Abderahman , van Hoek Remko , Lacity Mary
Published: December 2021

Background: Companies partaking in modern supply chains face numerous intra- and interorganizational barriers when it comes to the adoption of blockchain technology. Empirical research is missing that explores how exactly these barriers can be overcome. In this paper we first explore barriers that organizations need to overcome to successfully deploy blockchain technology. In a second step, we investigate the agrifood industry and highlight differences in coping strategies between incumbents and start-ups. Methods: We conducted a quantitative survey with 190 supply chain experts to identify barriers and an in-depth qualitative study that included 10 expert interviews to better understand the current situation in agrifood organizations. Results: The findings from the quantitative study show that the most relevant organizational barrier to blockchain adoption is the widespread lack of understanding of the technology and its potential benefits. In the qualitative study we illustrate how various intra- and interorganizational barriers can be overcome and how the resources and capabilities differ between incumbents and start-ups. Conclusions: Our results provide academics with a better understanding of the relevant barriers and bridges of blockchain adoption. Practitioners benefit from learning about the resources and capabilities they need to deploy in order to benefit from blockchain technology.
On the Universal Encoding Optimality of Primes
Authors: Papadakis Ioannis N. M.
Published: December 2021

The factorial-additive optimality of primes, i.e., that the sum of prime factors is always minimum, implies that prime numbers are a solution to an integer linear programming (ILP) encoding optimization problem. The summative optimality of primes follows from Goldbach’s conjecture, and is viewed as an upper efficiency limit for encoding any integer with the fewest possible additions. A consequence of the above is that primes optimally encode—multiplicatively and additively—all integers. Thus, the set P of primes is the unique, irreducible subset of ℤ—in cardinality and values—that optimally encodes all numbers in ℤ, in a factorial and summative sense. Based on these dual irreducibility/optimality properties of P, we conclude that primes are characterized by a universal “quantum type” encoding optimality that also extends to non-integers.
Effect of Temperature on Biobeneficiation of Bulk Copper-Nickel Concentrate with Thermoacidophilic Microbial Communities
Authors: Panyushkina Anna , Fomchenko Natalya , Babenko Vladislav , Muravyov Maxim
Published: December 2021

Bioleaching of the bulk copper–nickel sulfide concentrate was proposed as a method to remove nickel from it and to obtain a concentrate containing copper as chalcopyrite. This approach is based on the different refractoriness of sulfide minerals in ferric sulfate solutions and oxidation by acidophilic microorganisms. The bulk concentrate contained 10.8% copper in the form of chalcopyrite (CuFeS2) and 7.2% nickel that occurred in pentlandite ((Ni,Fe)9S8) and violarite (FeNi2S4). Three microbial communities grown at 35, 40, and 50 °C were used for bioleaching. The microbial community at 40 °C was the most diverse in the genus and species composition. At all temperatures of the process, the key roles in bioleaching belonged to mixotrophic and heterotrophic acidophiles. The highest levels of nickel leaching of 97.2 and 96.3% were observed in the case of communities growing at 40 and 50 °C, respectively. At the same time, the bioleach residue, which could be characterized as a marketable high-grade copper (chalcopyrite) concentrate, was obtained only at 40 °C. This solid contained 15.6% copper and 0.54% nickel. Thus, the biobeneficiation of bulk sulfide concentrates can be a promising field of biohydrometallurgy.
New Insights to the Crosstalk between Vascular and Bone Tissue in Chronic Kidney Disease–Mineral and Bone Disorder
Authors: Mace Maria L. , Egstrand Søren , Morevati Marya , Olgaard Klaus , Lewin Ewa
Published: December 2021

Vasculature plays a key role in bone development and the maintenance of bone tissue throughout life. The two organ systems are not only linked in normal physiology, but also in pathophysiological conditions. The chronic kidney disease–mineral and bone disorder (CKD-MBD) is still the most serious complication to CKD, resulting in increased morbidity and mortality. Current treatment therapies aimed at the phosphate retention and parathyroid hormone disturbances fail to reduce the high cardiovascular mortality in CKD patients, underlining the importance of other factors in the complex syndrome. This review will focus on vascular disease and its interplay with bone disorders in CKD. It will present the very late data showing a direct effect of vascular calcification on bone metabolism, indicating a vascular-bone tissue crosstalk in CKD. The calcified vasculature not only suffers from the systemic effects of CKD but seems to be an active player in the CKD-MBD syndrome impairing bone metabolism and might be a novel target for treatment and prevention.
Genesis of the Weizigou Au Deposit, Heilongjiang Province, NE China: Constraints from LA-ICP-MS Trace Element Analysis of Magnetite, Pyrite and Pyrrhotite, Pyrite Re-Os Dating and S-Pb Isotopes
Authors: Gao Yu , Hao Yujie , Lu Siyu
Published: December 2021

The Weizigou Au deposit in Heilongjiang Province, NE China, located in the southern Jiamusi Massif, shows similarities to IOCG deposits. To determine the mineralization age, sources of ore-forming materials and genetic type, pyrite Re-Os dating, S-Pb isotopic analysis, in situ sulfur analysis and LA-ICP-MS analysis of trace elements in magnetite, pyrite and pyrrhotite were conducted. Four pyrite samples yielded a Re-Os isochron age of 197 ± 11 Ma, implying the occurrence a metallogenic event in the Early Jurassic. The δ34S values of sulfides display a relatively narrow range from 4.70‰ to 12.83‰ (mainly 9.90‰ to 12.83‰), which may be accounted for the extensively exposed granitic gneiss and meta-gabbro, with δ34S values of 7.44‰ to 8.44‰ and 4.37‰ to 10.54‰, respectively. Sulfide lead isotopic compositions have 206Pb/204Pb = 18.605–20.136, 207Pb/204Pb = 15.637–15.710 and 208Pb/204Pb = 38.534–39.129, indicating that the lead was derived from a mixed source. Magnetite has the characteristics of a lower Ti content and higher Zn content, indicating that it should be of hydrothermal origin, which may be related to IOCG-type mineralization. Pyrite and pyrrhotite have a Co/Ni ratio greater than 1 and a lower As content, indicating that they are of magmatic hydrothermal origin. Integrating the above analysis results, we inferred that the Weizigou Au deposit experienced the IOCG-type mineralization in the Middle-Late Permian, associated with magmatic-hydrothermal mineralization in the Early Jurassic.
Magnetic Solid-Phase Extraction Based on Magnetic Sulfonated Reduced Graphene Oxide for HPLC–MS/MS Analysis of Illegal Basic Dyes in Foods
Authors: Cui Shibo , Mao Xinwu , Zhang Haijing , Zeng Haowei , Lin Zihao , Zhang Xuewu , Qi Ping
Published: December 2021

In this study, a magnetic solid-phase extraction (MSPE) method coupled with High-Performance Liquid Chromatography Mass Spectrometry (HPLC–MS/MS) for the determination of illegal basic dyes in food samples was developed and validated. This method was based on Magnetic sulfonated reduced graphene oxide (M-S-RGO), which was sensitive and selective to analytes with structure of multiaromatic rings and negatively charged ions. Several factors affecting MSPE efficiency such as pH and adsorption time were optimized. Under the optimum conditions, the calibration curves exhibited good linearity, ranging from 5 to 60 µg/g with correlation coefficients >0.9950. The limits of detection of 16 basic dyes were in the range of 0.01–0.2 µg/L. The recoveries ranged from 70% to 110% with RSD% < 10%. The results indicate that M-S-RGO is an efficient and selective adsorbent for the extraction and cleanup of basic dyes. Due to the MSPE procedures, matrix effect and interference were eliminated in the analysis of HPLC–MS/MS without the matrix-matched standards. Thus, validation data showed that the proposed MSPE–HPLC–MS/MS method was rapid, efficient, selective, and sensitive for the determination of illegal basic dyes in foods.
Gelatin-Alginate Coacervates Optimized by DOE to Improve Delivery of bFGF for Wound Healing
Authors: Kim ByungWook , Ban Eunmi , Kim Aeri
Published: December 2021

Metabolic disorders in diabetic patients are associated with altered protein and lipid metabolism and defects in granulation tissue formation, resulting in non-healing wounds such as diabetic foot ulcers (DFU). Growth factors have essential roles in tissue re-epithelization and angiogenesis during wound healing. In this study, a complex coacervate was evaluated as an enhanced delivery system for fibroblast growth factor (bFGF) to control its release rate and protect it from proteases. Coacervates composed of gelatin Type A (GA) and sodium alginate (SA) were optimized by the Design of Experiments (DOE), with the polymer ratio and the medium’s pH as the independent variables, and turbidity, particle size, polydispersity index, and encapsulation efficiency (EE, %) as the responses. The optimized coacervate protected bFGF from trypsin digestion and showed controlled release compared with bFGF in solution or a physical mixture of GA and SA. It enhanced the viability, migration, and procollagen I C-terminal propeptide synthesis of human dermal fibroblasts in hyperglycemic conditions. In summary, the DOE approach was successfully applied to optimize bFGF GA-SA coacervates as a potential novel therapeutic modality to treat DFU.
A Comprehensive Review on Natural Fibers: Technological and Socio-Economical Aspects
Authors: Karimah Azizatul , Ridho Muhammad Rasyidur , Munawar Sasa Sofyan , Ismadi  , Amin Yusup , Damayanti Ratih , Lubis Muhammad Adly Rahandi , Wulandari Asri Peni , Nurindah  , Iswanto Apri Heri , Fudholi Ahmad , Asrofi Mochamad , Saedah Euis , Sari Nasmi Herlina , Pratama Bayu Rizky , Fatriasari Widya , Nawawi Deded Sarip , Rangappa Sanjay Mavinkere , Siengchin Suchart
Published: December 2021

Asian countries have abundant resources of natural fibers, but unfortunately, they have not been optimally utilized. The facts showed that from 2014 to 2020, there was a shortfall in meeting national demand of over USD 2.75 million per year. Therefore, in order to develop the utilization and improve the economic potential as well as the sustainability of natural fibers, a comprehensive review is required. The study aimed to demonstrate the availability, technological processing, and socio-economical aspects of natural fibers. Although many studies have been conducted on this material, it is necessary to revisit their potential from those perspectives to maximize their use. The renewability and biodegradability of natural fiber are part of the fascinating properties that lead to their prospective use in automotive, aerospace industries, structural and building constructions, bio packaging, textiles, biomedical applications, and military vehicles. To increase the range of applications, relevant technologies in conjunction with social approaches are very important. Hence, in the future, the utilization can be expanded in many fields by considering the basic characteristics and appropriate technologies of the natural fibers. Selecting the most prospective natural fiber for creating national products can be assisted by providing an integrated management system from a digitalized information on potential and related technological approaches. To make it happens, collaborations between stakeholders from the national R&D agency, the government as policy maker, and academic institutions to develop national bioproducts based on domestic innovation in order to move the circular economy forward are essential.
Why Do Students Become Cyberbullies? Elucidating the Contributions of Specific Developmental Risks to Cyberbullying
Authors: Wallner Susanne , Stemmler Mark
Published: December 2021

Cyberbullying is currently considered as a widespread problem among children and adolescents; in particular, the risks of cyberbullying have recently been examined. The empirical analyses of the present work are based on data from a German longitudinal study. The self-reports of adolescents from Dortmund and Nuremberg on both cyberbullying and individual and contextual characteristics were taken into account. The two-wave panel encompasses N = 871 adolescents (44.5% male); the average age was M = 15.1 years (SD = 0.83) at t1. Data on cyberbullying refer to sending insults or threats to others via the Internet, spreading rumours or talking badly about others via the Internet, and sending private e-mails, photos or similar from others in order to embarrass or ridicule the persons concerned. Other characteristics relate to single aspects of psychopathy (egocentric egotism, low self-control, empathy deficits), acceptance of violence, and delinquent peers. The path analytical findings illustrate the predictive relationships between both individual and contextual risks and cyberbullying in adolescence. The empirical results are discussed, among others, from the perspective of developmental and life-course criminology.
The Evolution of Rural Tourism in Wuhan: Complexity and Adaptability
Authors: Lv Li , Hu Jing , Xu Xin , Tian Xiaobo
Published: December 2021

The complex adaptation system (CAS) theory of “adaptability to produce complexity” is a new theoretical perspective for the spatio-temporal evolution of rural tourism systems. Based on the CAS theory, the theoretical framework, structural composition, formation process, and evolution mechanism of the rural tourism complex system were examined and revealed. The suburban country region of Wuhan was taken as the area of focus for empirical research. The state of the rural tourism destination system in Wuhan has gone through various periods of development: the embryonic stage of the system (before 2000), formation (2001–2007), rapid development (2008–2015), and consolidation and transformation (since 2016). Under the environments stimulating external physical geography, social economy, market demand, and emergencies, multiple agents such as government, enterprises, residents, and tourists in Wuhan have actively adapted to the environment and other agents, and the interaction intensity and complexity have gradually increased, driving the emergence of system agent types, functional structures, and spatial patterns. The agents continue to grow, differentiate, and aggregate. The tourism product has shifted from the dominance of a rural ecological scenery and leisure agriculture to diversified development, and with the main function changing from sightseeing to leisure and vacation. The rural communities have been renovated and beautified, transforming them from a provider of rural service facilities to a co-builder of a rural-imaged tourism space.
Bessel Collocation Method for Solving Fredholm–Volterra Integro-Fractional Differential Equations of Multi-High Order in the Caputo Sense
Authors: Ahmed Shazad Shawki , MohammedFaeq Shabaz Jalil
Published: December 2021

The approximate solutions of Fredholm–Volterra integro-differential equations of multi-fractional order within the Caputo sense (F-VIFDEs) under mixed conditions are presented in this article apply a collocation points technique based completely on Bessel polynomials of the first kind. This new approach depends particularly on transforming the linear equation and conditions into the matrix relations (some time symmetry matrix), which results in resolving a linear algebraic equation with unknown generalized Bessel coefficients. Numerical examples are given to show the technique’s validity and application, and comparisons are made with existing results by applying this process in order to express these solutions, most general programs are written in Python V.3.8.8 (2021).
On the Dominant Lunisolar Perturbations for Long-Term Eccentricity Variation: The Case of Molniya Satellite Orbits
Authors: Talu Tiziana , Alessi Elisa Maria , Tommei Giacomo
Published: December 2021

The aim of this work is to investigate the main dominant terms of lunisolar perturbations that affect the orbital eccentricity of a Molniya satellite in the long term. From a practical point of view, these variations are important in the context of space situational awareness—for instance, to model the long-term evolution of artificial debris in a highly elliptical orbit or to design a reentry end-of-life strategy for a satellite in a highly elliptical orbit. The study assumes a doubly averaged model including the Earth’s oblateness effect and the lunisolar perturbations up to the third-order expansion. The work presents three important novelties with respect to the literature. First, the perturbing terms are ranked according to their amplitudes and periods. Second, the perturbing bodies are not assumed to move on circular orbits. Third, the lunisolar effect on the precession of the argument of pericenter is analyzed and discussed. As an example of theoretical a application, we depict the phase space description associated with each dominant term, taken as isolated, and we show which terms can apply to the relevant dynamics in the same region.
Prevalence and Distribution of HPV Genotypes in Immunosuppressed Patients in Lorraine Region
Authors: Boudes Margot , Venard Véronique , Routiot Thierry , Buzzi Marie , Maillot Floriane
Published: December 2021

Background: The primary objective of this work was to assess the prevalence and distribution of HPV genotypes in immunosuppressed patients, and to compare them with the French Monsonego cohort. Secondary objectives were to evaluate whether the risk of HPV infection was correlated with HIV viral load, CD4 cell count in HIV-infected patients and the type, number of immunosuppressive therapies or type of pathology (transplant vs. autoimmune diseases) in patients undergoing long-term immunosuppressive therapy. Methods: An observational, monocentric and historical study was conducted including all immunosuppressed patients having received an HPV testing, in the Laboratory of Virology, Nancy Regional Teaching Hospital Center, between 2014 and 2020. Immunosuppressed patients were either HIV-infected or received long-term immunosuppressive therapy. Results: In our cohort, the prevalence of HPV infection (75.6% vs. 16.1% p < 0.05), the proportion of patients with high-risk HPV infection (48.9% vs. 15.1% p < 0.05) and with multiple HPV infection (41.1% vs. 5.7% p < 0.05) were significantly higher than in the Monsonego cohort. HPV 52 (13%), 53 (13%) and 16 (10%) were the most common in the immunosuppressed population, while it was HPV 16, 42 and 51 in the Monsonego cohort. Conclusions: This study supports that a particular attention must be given to all the immunosuppressed patients for the screening and care of HPV-related diseases because of major modifications of HPV epidemiology compared with the overall population.
Short-Term River Flood Forecasting Using Composite Models and Automated Machine Learning: The Case Study of Lena River
Authors: Sarafanov Mikhail , Borisova Yulia , Maslyaev Mikhail , Revin Ilia , Maximov Gleb , Nikitin Nikolay O.
Published: December 2021

The paper presents a hybrid approach for short-term river flood forecasting. It is based on multi-modal data fusion from different sources (weather stations, water height sensors, remote sensing data). To improve the forecasting efficiency, the machine learning methods and the Snowmelt-Runoff physical model are combined in a composite modeling pipeline using automated machine learning techniques. The novelty of the study is based on the application of automated machine learning to identify the individual blocks of a composite pipeline without involving an expert. It makes it possible to adapt the approach to various river basins and different types of floods. Lena River basin was used as a case study since its modeling during spring high water is complicated by the high probability of ice-jam flooding events. Experimental comparison with the existing methods confirms that the proposed approach reduces the error at each analyzed level gauging station. The value of Nash–Sutcliffe model efficiency coefficient for the ten stations chosen for comparison is 0.80. The other approaches based on statistical and physical models could not surpass the threshold of 0.74. Validation for a high-water period also confirms that a composite pipeline designed using automated machine learning is much more efficient than stand-alone models.
Effect of Plant Species on the Performance and Bacteria Density Profile in Vertical Flow Constructed Wetlands for Domestic Wastewater Treatment in a Tropical Climate
Authors: Zahui Franck Michaël , Ouattara Jean-Marie Pétémanagnan , Kamagaté Mahamadou , Coulibaly Lacina , Stefanakis Alexandros I.
Published: December 2021

Bacteria are frequently studied due to their involvement in pollutants transformation processes during wastewater treatment. In this study, the treatment efficiency, bacteria densities and their vertical profile were investigated in pilot-scale vertical flow constructed wetlands (VFCW) planted with different plant species under a tropical climate in west Africa. Five beds were planted with local plant species, i.e., Andropogon gayanus, Chrysopogon zizanioides, Echinochloa pyramidalis, Pennisetum purpureum and Tripsacum laxum, while one bed remained unplanted. These species have been rarely used in CWs while some (e.g., T. laxum) are tested for the first time. After a 7-month trial, bacteria densities were measured in substrate samples separated into six layers along the bed depth. Plants presence enhanced the bacterial density and VFCW efficiency; the removal rates of organic matter (90.9–95.9%; COD and 95.2–98.5%; BOD5), nitrogen (74.3–84%; TN and 76–84%; NH4-N) and phosphorus (77.4–96.9%; PO4-P) were higher by 5.9–24.1% compared to the control bed, providing an overall excellent treatment performance for a single-stage VFCW system. Small numbers of anaerobic bacteria were obtained in the VFCWs, explaining the low-to-zero NO3-N removal, except for the VFCWs with T. laxum and P. purpureum. Aerobic bacteria decreased from the upper to bottom layers from 17.4 to 0.1 × 106 CFU/g in the planted beds, while anaerobic bacteria increased from 0.1 to 2.1 × 106 CFU/g. Anaerobic bacteria were more abundant in the unplanted than in the planted beds. The total bacteria count was dominated by aerobic bacteria, and decreased from the surface towards the bottom. Overall, the VFCW with P. purpureum demonstrated the highest efficiency, indicating that this design is an effective and sustainable nature-based solution for wastewater treatment in a tropical climate.
Factors affecting the migration of qualified specialists in the framework of the export of education
Authors: Saginov Vitaliy Leonidovich , Runova Nadezhda Yurievna
Published: December 2021

The mobility of qualified specialists is a trend in the modern economy. In addition to the brain drain, the concept of brain circulation has emerged, the source and constituent of which is the export of education and the international student mobility programs. Based on the systematization and analysis of scientific publications in international scientometric systems, the article highlights the factors influencing the decision of students participating in study programs abroad to stay in the host country or return home after the studies.
Determining the etiology of small bowel obstruction in patients without intraabdominal operative history: a retrospective study
Authors: Jang Youngjin , Jung Sung Min , Heo Tae Gil , Choi Pyong Wha , Kim Jae Il , Jung Sung-Won , Jun Heungman , Shin Yong Chan , Um Eunhae
Published: December 2021

Purpose: Most of the causes of small bowel obstruction (SBO) in patients without a history of abdominal surgery are unclear at initial assessment. This study was conducted to identify the etiology and clinical characteristics of SBO in virgin abdomens and discuss the proper management.Methods: A retrospective review involving operative cases of SBO from a single institute, which had no history of abdominal surgery, was conducted between January 2010 and December 2020. Clinical information, including radiological, operative, and pathologic findings, was investigated to determine the etiology of SBO.Results: A total of 55 patients were included in this study, with a median age of 57 years and male sex (63.6%) constituting the majority. The most frequently reported symptoms were abdominal pain and nausea or vomiting. Neoplasm as an underlying cause accounted for 34.5% of the cases, of which 25.5% were malignant cases. In patients aged ≥60 years (n=23), small bowel neoplasms were the underlying cause in 12 (52.2%), of whom 9 (39.1%) were malignant cases. Adhesions and Crohn disease were more frequent in patients aged <60 years. Coherence between preoperative computed tomography scans and intraoperative findings was found in 63.6% of the cases.Conclusion: There were various causes of surgical cases of SBO in virgin abdomens. In older patients, hidden malignancy should be considered as a possible cause of SBO in a virgin abdomen. Patients with symptoms of recurrent bowel obstruction who have no history of prior abdominal surgery require thorough medical history and close follow-up.
Aplicación de algoritmos de optimización para la localización de centros de distribución comercial
Authors: Guamán Lozano Angel Geovanny , Miño Cascante Gloria Elizabeth , Moyano Alulema Julio Cesar
Published: December 2021

El presente trabajo muestra la utilización de los métodos de centro de gravedad, Weber y un problema de ubicación de red en dos casos de estudio distintos de una industria cementera y una de distribución de alimentos; el objetivo es determinar el sitio adecuado para la instalación de un nuevo centro de distribución en base a modelos de optimización. En primer lugar, se buscaron los datos relacionados con los costos de la cadena de suministro y ubicaciones geográficas mediante un estudio de costos y programas de georreferenciación respectivamente, luego se desarrollaron dos programas para cada caso que cumplen con las restricciones del modelo matemático subyacente de programación lineal utilizado desarrollado en Matlab con las secciones GUIDE. Finalmente se obtuvieron las coordenadas cartesianas de la nueva instalación propuesta para la cementera. Por otro lado, se definieron los centros de distribución que deben estar habilitados en la red de distribución de una empresa de alimentos, incluyendo la cantidad de producto que debe ser enviado a los diferentes mercados de consumo. La investigación establece soluciones factibles en los dos casos de estudio generando la reducción de los recorridos para las organizaciones a través del desarrollo de un programa de interfaz sencilla.

 

Palabras clave: investigación operativa; logística; técnicas de optimización.
Medición de la calidad de servicios hoteleros de Manta, Ecuador a través del modelo HOTELQUAL
Authors: Loor Moreira Alexandra Jacqueline , Zambrano Barcia Andrea Viviana , Peña Vélez Isaura Vanessa , Ponce Andrade Johnny Edison
Published: December 2021

Esta investigación se centra en hoteles y hostales de la ciudad de Manta, Ecuador; para evaluar la calidad del servicio que estos brindan a sus clientes a través de la escala de medición HOTELQUAL con una evaluación de 3 dimensiones (instalaciones, personal y organización), con el fin de que los establecimientos conozcan aciertos y errores para poder retroalimentarse y plantearse un plan de mejoras que contribuya al crecimiento de su empresa. Se utilizó un método cuantitativo, haciendo uso de la escala de likert y se realizó in situ observando y bajo la vivencia del servicio recibido que permitió obtener como resultado que a nivel general la calidad de servicio ofertada por estas empresas cumple con el nivel de satisfacción del cliente, pero existen tres aspectos que presentaron debilidad siendo estos: medición de resolución eficaz de problemas, medición de rapidez de servicios y base de datos para reducir tiempo de registro.
 
Palabras clave: comportamiento del consumidor; promoción turística; estrategia de marketing; factor de competitividad.
 
Abstract
This research will focus on hotels and hostels in the city of Manta, Ecuador; and will evaluate the quality of service they provide to their customers through the SERVQUAL measurement scale with an evaluation of its 5 dimensions in order to establish know their successes and mistakes to be able to get feedback and consider an improvement plan that contributes to the growth of your company. This study uses a quantitative method, making use of the likert scale for the determination of results. The data was carried out in situ observing and under the experience of the service received, which allowed obtaining as a result that in general the quality of service offered by these companies meets the level of customer satisfaction, but there are three aspects that showed weakness, these being efficient problem solving, speed measurement of services and databases to reduce registration time.
 
Keywords: consumer behavior; tourism promotion; marketing strategy; competitiveness factor.
Consecuencias socioeconómicas en los comerciantes de cárnicos de Portoviejo por la movilidad después del 16A
Authors: Gómez García Susetty Lorena , Giler Briones Wilmer David , Rezabala Bravo Karol Stefania , Loor Santana Ana Patricia
Published: December 2021

El objetivo de esta investigación es analizar la situación de los comerciantes de cárnicos del Mercado N°1 del cantón Portoviejo, provincia de Manabí, Ecuador, después de la movilidad ocasionada por el sismo del 16 de abril de 2016. Con el propósito de cumplirlo, se procedió a una fase documental y otra fase de campo; adicionalmente, en la fase cuantitativa se aplicó una encuesta a escala de Likert a una muestra representativa de los comerciantes de cárnicos que fueron reubicados; los datos de dicha encuesta se procesaron con el programa SPSS versión 25, haciendo uso de la estadística descriptiva. Los resultados permitieron conocer que los expendedores minoristas de cárnicos del mercado N°1 del Cantón presentan serios problemas, debido a la reubicación y la competencia desleal de los comerciantes informales, lo anteriormente manifestado ha ido en detrimento del nivel de ingresos de estos expendedores para que puedan satisfacer plenamente sus necesidades básicas.

 

Palabras clave: movilidad; ingresos; comercio minoritas; desarrollo socioeconómico.

 

ABSTRACT

The objective of this research is to analyze the situation of meat merchants in Market No. 1 of the Portoviejo canton, Manabí province, Ecuador, after the mobility caused by the earthquake of April 16, 2016. In order to comply, a documentary phase and another field phase were carried out; Additionally, in the quantitative phase, a Likert scale survey was applied to a representative sample of meat merchants who were relocated; the data from this survey were processed with the SPSS version 25 program, using descriptive statistics. The results made it possible to know that the retail vending of meat in the market No. 1 of the Canton present serious problems, due to the relocation and unfair competition of informal traders, the aforementioned has been detrimental to the income level of these vendors so that can fully meet their basic needs.

 

Keywords: mobility; income; retail trade; socioeconomic development.
Clima organizacional y la satisfacción de los docentes en las MYPES del sector educación Tumbes
Authors: Escobedo Gálvez Fernando
Published: December 2021

La investigación determinó la caracterización del clima organizacional y la satisfacción de los docentes en las MyPes del sector educación Tumbes; mediante una metodología descriptivo transversal; su población estuvo constituida por educadores de 33 Instituciones Educativas Privadas de Educación Inicial d e Tumbes y la muestra por muestreo probabilístico de 110 educadores los cuales presentan las condiciones y requisitos necesarios para el perfil con el título profesional de Licenciados en Educación, de sexo femenino. Se encontró que el 36.4% de educadores considera que el nivel de clima organizacional es malo, un 33.6% regular; y que la satisfacción con la organización respecto a las decisiones que toma el director. Los educadores muestran niveles de clima organizacional malo y nivel de satisfacción laboral media y bajo, debido a la deficiente infraestructura, limitados equipos y materiales. Estas desigualdades deben acatarse con mayor iniciativa por parte del director en incentivar la participación de sus educadores.

 

Palabras clave: satisfacción laboral; instituciones educativas; educadores; microempresas; procesos educativos.

 

ABSTRACT

The research determined the characterization of the organizational climate and the satisfaction of teachers in the M & P of the Tumbes education sector; using a descriptive transversal methodology; Its population was made up of educators from 33 Private Educational Institutions of Initial Education of Tumbes and the sample by probability sampling of 110 educators who present the conditions and necessary requirements for the profile with the professional title of Graduates in Education, female. It was found that 36.4% of educators consider that the level of organizational climate is bad, 33.6% regular; and satisfaction with the organization regarding the decisions made by the director. Educators show bad organizational climate levels and medium and low level of job satisfaction, due to poor infrastructure, limited equipment and materials. These inequalities must be respected with greater initiative on the part of the principal in encouraging the participation of his educators.

 

Keywords: job satisfaction; educational institutions; educators; microenterprises; educational processes.
Las secuelas del terremoto: el problema de la malnutrición infantil en Manabí
Authors: Rivera Jairo , Olarte Stephany , Rivera Nadya
Published: December 2021

La malnutrición infantil es un tema preocupante en Ecuador, donde sus prevalencias resultan muy superiores al promedio de América Latina; para el año 2018, la desnutrición infantil en el país alcanza el 23%, superando ampliamente el promedio regional que bordea el 9%, y el sobrepeso infantil en el país alcanzó el 16%, superando el promedio regional de alrededor de 8%. En este contexto, esta investigación tiene el objetivo de analizar la malnutrición infantil en la provincia de Manabí, su evolución y características. Para ello se desarrolla una metodología cuantitativa, usando datos de las Encuestas de Condiciones de Vida y las Encuestas Nacionales de Salud y Nutrición, y emplea modelos de regresión probabilística. Entre los principales resultados se encuentra que la desnutrición y el sobrepeso infantil se asocian con factores diversos, donde ha existido una reducción de la desnutrición entre 1999 y 2014; sin embargo, los problemas nutricionales para el año 2018 se han agudizado, lo cual se presenta como una secuela del terremoto del año 2016.

 

Palabras clave: desnutrición; sobrepeso; Ecuador; análisis de regresión.

 

ABSTRACT

Child malnutrition is an alarming issue in Ecuador, where its prevalence is much higher than the Latin American average; by 2018, child malnutrition in the country reaches 23%, far exceeding the regional average bordering 9%, and child overweight in the country reaches 16%, exceeding the regional average of around 8%. In this context, this research aims to analyze child malnutrition in the province of Manabí, its evolution and characteristics. This article develops a quantitative methodology, using data from the Living Conditions Surveys and the National Health and Nutrition Surveys, and uses probabilistic regression models. Among the main results are that child malnutrition and overweight are associated with various factors, where there has been a reduction in malnutrition between 1999 and 2014; however, nutritional problems for 2018 have become more acute, which is presented as a sequel to the 2016 earthquake.

 

Keywords: malnutrition; overweight; Ecuador; regression analysis.
El covid-19 y su impacto económico en las empresas hoteleras de Manta-Ecuador
Authors: Pinargote Montenegro Karen Gisela , Loor Chávez Temístocles Deodato
Published: December 2021

El turismo a nivel mundial históricamente ha logrado un crecimiento importante, siendo considerado como una de las principales fuentes de ingresos de los países. Ecuador a raíz de la declaratoria mundial del COVID-19 experimentó una disminución en los ingresos del sector turístico, siendo Manta una de las ciudades con mayor impacto especialmente en el sector hotelero. Mediante la presente investigación, se busca conocer la incidencia económica generada por el COVID-19 sobre el sector hotelero de Manta, y determinar las alternativas de reactivación para este sector, considerando la capacidad de las empresas hoteleras para enfrentar dicha crisis. A través de un estudio descriptivo de enfoque cualitativo y cuantitativo, se realizaron encuestas a los turistas de la ciudad de Manta, cuyos resultados permitieron conocer que sin lugar a dudas el COVID-19 ha desencadenado la desaceleración económica en el sector hotelero local, por la disminución de la demanda de estos servicios.

 

Palabras clave: Covid-19; impacto económico; turismo; sector hotelero, pymes.

 

ABSTRACT

Tourism worldwide has historically achieved significant growth, being considered one of the main sources of income for countries. Ecuador, as a result of the world declaration of COVID-19, experienced a decrease in income from the tourism sector, with Manta being one of the cities with the greatest impact, especially in the hotel sector. Through this research, we seek to know the economic impact generated by COVID-19 on the hotel sector of Manta, and determine the reactivation alternatives for this sector, considering the capacity of hotel companies to face this crisis. Through a descriptive study with a qualitative and quantitative approach, surveys were conducted with tourists in the city of Manta, the results of which revealed that without a doubt COVID-19 has triggered the economic slowdown in the local hotel sector, due to the decreased demand for these services.

 

Keywords: Covid-19; economic impact; tourism; hotel sector, smes.
Buenas prácticas ambientales en hoteles caso de estudio: iberostar grand trinidad
Authors: Martínez Rodríguez María De los Ángeles , Pelegrín Naranjo Analién , Pelegrín Naranjo Lestter , Naranjo Llupart María Rosa
Published: December 2021

El presente artículo realiza un estudio con un enfoque materialista dialéctico y aplica métodos de investigación del nivel teórico, empírico, estadísticos y matemáticos, para indagar sobre el uso de buenas prácticas ambientales en hoteles de ciudad; se utiliza como caso de estudio el hotel Iberostar Grand Trinidad. Se tienen en cuenta los Objetivos de Desarrollo Sostenibles de la Asamblea General de la Organización de las Naciones Unidas que impulsan una actitud responsable en la relación empresa – medio ambiente y una imagen favorable de la empresa. Como resultado se exponen las buenas prácticas ambientales en áreas clave de la instalación lo que llevó a la obtención de numerosas certificaciones y reconocimientos; éstas son una herramienta de marketing muy importante para la gestión comercial de la organización y se demuestra en los resultados económicos positivos obtenidos. Se recomienda como un relevante ejemplo a seguir por otros hoteles del territorio con similares características. Palabras clave: Estimación; sostenibilidad; desarrollo sostenible, turismo

 

ABSTRACT

 

This article carries out a study with a dialectical materialist approach and applies research methods at the theoretical, empirical, statistical and mathematical levels, to inquire about the use of good environmental practices in city hotels; the Iberostar Grand Trinidad hotel is used as a case study. The Sustainable Development Goals of the United Nations General Assembly are taken into account, which promote a responsible attitude in the company-environment relationship, and thus achieve a favorable image of the company. As a result, good environmental practices are exposed in the key areas of the facility, which led to the obtaining of numerous certifications and recognitions; these are a very important marketing tool for the commercial management of the organization and it is demonstrated in the positive economic results obtained. It is recommended as a relevant example to be followed by other hotels in the territory with similar characteristics.

 

Keywords: Good practices; sustainability; sustainable development, tourism
Estudio de la cadena agroalimentaria del plátano en la provincia de Manabí
Authors: Silva Alvarado Pola Mary , Sablón Cossío Neyfe , Bravo Giler María Amelia
Published: December 2021

El estudio de las cadenas agroalimentarias es una práctica internacional que contribuye a la mejora de la seguridad alimentaria de forma holística. En específico, el plátano es uno de los productos agrícolas más importante después del arroz, trigo y maíz en la provincia de Manabí, Ecuador. Por ello, el objetivo de este artículo es analizar la cadena agroalimentaria del plátano en Manabí, con un enfoque de economía circular. Para ello, se mapeo la cadena de estudio donde se describe cada eslabón de esta y los productos fundamentales que consumen los clientes. Se diagnosticó la economía circular a partir de una lista de chequeo y se identificó los posibles productos a partir de los residuos de la planta y el fruto. Este trabajo presenta un valor práctico debido a que contribuye a la toma de decisiones en el sector agrícola para una mejora en la sostenibilidad.

 

Palabras clave: Producto agrícola, cadena agroalimentaria, actores, eslabones.
Procesos de producción y productividad en la industria de calzado ecuatoriana: caso empresa Mabelyz
Authors: Mayorga Abril César , Ruiz Guajala Mery , Mantilla Luis Marcelo , Moyolema Moyolema Mayra
Published: December 2021

La definición de procesos en la industria de transformación ecuatoriana ha sido un tema complejo al que no se lo ha tomado con la importancia del caso. El presente estudio describe la incidencia de los procesos de producción en la productividad de las empresas de calzado, además de la definición de los mismos y sus indicadores. Para lograr estos objetivos, se procedió a tomar la información directa de la empresa Mabelyz. Los resultados encontrados permiten describir las fortalezas y deficiencias que tiene la empresa en estudio, respecto a la definición de procesos, productividad, adquisiciones de materia prima, capacitación, planificación, que faciliten las decisiones gerenciales. Se concluye que la empresa en estudio no tiene claramente definidos sus procesos productivos, lo que genera desperdicio de recursos que inciden en su productividad y rentabilidad.
Efecto de luces LED y fluorescentes sobre el crecimiento y la biomasa de Thalassiosira pseudonana (Cleve, 1873)
Authors: Bravo Montesdeoca Maria Guadalupe , Lodeiros Seijo Cesar , Zapata Vívenes Edgar , Alió Mingo Jose Javier
Published: December 2021

Effect of LED and fluorescent lights on growth and biomass of Thalassiosira pseudonana (Cleve, 1873)
Resumen
En búsqueda de mejorar la producción de la microalga Thalassiosira pseudonana, utilizada frecuentemente como alimento para larvas y juveniles de diversas especies de interés acuícola, en este estudio se evaluó la incidencia de diodos emisores de luz (LED) y luces fluorescentes (F) en su crecimiento y biomasa celular. Seis repeticiones de la cepa T. pseudonona, preparada en agua de mar filtrada tratada con UV y medio nutritivo Guillard F2 enriquecido con Na2SiO3, fueron sometidas a 4200 lux (± 5%) emitida desde luces LED y F. Se partió de inóculos en tubos de ensayo de 20 mL y trasvasados a recipientes de mayor volumen cada 3 días, hasta alcanzar 15 L en bolsas plásticas a los 14 días. Al término del ensayo, se determinó la densidad de microalgas, su biomasa y masa celular. El crecimiento fue descrito mediante un modelo exponencial sin diferencia en las tasas de crecimiento entre L y F. La biomasa con L alcanzó 0,27±0,05 mg L-1 y con F 0,17±0,05 mg L-1, mientras que el peso celular fue 64,8±11 pg con L y 41,2±12 pg con F. Se concluye que la irradiación del cultivo microalgal con luces LED eleva la masa celular de T. pseudonana, lo cual podría representar mayor rendimiento al ser utilizado como alimento en organismos acuáticos.
Palabras clave: iluminación; nutrición; diatomea; tamaño celular.
Abstract
In search to improve the production of the microalgae Thalassiosira pseudonana, a species frequently used as food for larvae and juveniles of various species with aquaculture interest, in this study we evaluated the incidence of light-emitting diodes (LEDs) and fluorescent lights (F) on its growth and cell biomass. Six replicates of the T. pseudonona strain, prepared in filtered seawater treated with UV and Guillard F2 nutrient medium enriched with Na2SiO3, were subjected to 4200 lux (± 5%) emitted from LED lights and F. The cultures were started from inoculums in 20 mL test tubes and transferred to larger volume containers every 3 days, until reaching 15 L in plastic bags after 14 days. At the end of the trials, the density of microalgae, their biomass and cell mass were determined. Growth was described by an exponential model with no difference in growth rates between L and F. The biomass with L reached 0.27 ± 0.05 mg L-1 and with F 0.17 ± 0.05 mg L-1, while the cell mass was 64.8 ± 11 pg with L and 41.2 ± 12 pg with F. It is concluded that the irradiation of the microalgal culture with LED lights increased the cell mass of T. pseudonana, which could represent greater performance when used as food for aquatic organisms.
Keywords: illumination; nutrition; diatom; cell size.
Impact of E-Commerce in Industry
Authors:   Departemen Manajemen, Universitas Komputer Indonesia, Indonesia, Rizaldi A , Madany Z ,   Departemen Sistem Informasi, Universitas Komputer Indonesia, Indonesia
Published: December 2021

E-Commerce is a buying and selling activity, where the activities of sellers and buyers are carried out through the internet. This study aims to illustrate the impact of using E-Commerce, especially for the benefits of E-Commerce for business strategies. There are several ways to develop business both manually and computers. But in this era of the global economy, not only is the work process computerized, but the sales process also utilizes these facilities. The goal is to use e-commerce to attract more consumers because it can reach wider consumers. This research uses descriptive qualitative method and literature study based on previous research. So is it enough to make E-Commerce an industry that will experience an increase in sales results? Of course not, but the more quality E-Commerce that is created will further increase profits for the company