bluuebunny/crossref_metadata_2025 huggingface dataset:
The differential calibration of the HPA axis as a function of trauma versus adversity: A systematic review and p-curve meta-analyses
Authors: Kamkar Niki H. , Lowe Cassandra J , Morton J. Bruce
Published: February 2021

Although there is an abundance of evidence linking the function of the hypothalamic-pituitary-adrenal (HPA) axis to adverse early-life experiences, the precise nature of the association remains unclear. Some evidence suggests early-life adversity leads to cortisol hyper-reactivity, while other evidence suggests adversity leads to cortisol hypo-reactivity. Here, we distinguish between trauma and adversity, and use p-curves to interrogate the conflicting literature. In Study 1, trauma was operationalized according to DSM-5 criteria; the p-curve analysis included 68 articles and revealed that the literature reporting associations between trauma and blunted cortisol reactivity contains evidential value. Study 2 examined the relationship between adversity and cortisol reactivity. Thirty articles were included in the analysis, and p-curve demonstrated that adversity is related to heightened cortisol reactivity. These results support an inverted U-shaped function relating severity of adversity and cortisol reactivity, and underscore the importance of distinguishing between “trauma” and “adversity”.
The Problem of Purity in Moral Psychology
Authors: Gray Kurt , DiMaggio Nicholas , Schein Chelsea , Kachanoff Frank
Published: February 2021

The idea of “purity” transformed moral psychology. Here, we provide the first systematic review of this concept. Although often discussed as one construct, we reveal ~9 understandings of purity, ranging from respecting God to not eating gross things. This striking heterogeneity arises because purity—unlike other moral constructs—is not understood by what it is, but what it isn’t: obvious interpersonal harm. This poses many problems for moral psychology, and explains why purity lacks convergent and divergent validity, and why purity is confounded with politics, religion, weirdness, and perceived harm. Because purity is not a coherent construct, it cannot be a distinct basis of moral judgment or specially tied to disgust. Rather than a specific moral domain, purity is best understood as a loose set of themes in moral rhetoric. These themes are scaffolded on cultural understandings of harm—the broad, pluralistic harm outlined by the Theory of Dyadic Morality.
Qualitätskriterien für die automatische Inhaltsanalyse. Zur Integration von Verfahren des maschinellen Lernens in die Kommunikationswissenschaft
Authors: Laugwitz Laura
Published: February 2021

In der automatischen Inhaltsanalyse werden die standardisierte manuelle Inhaltsanalyse der Kommunikationswissenschaft und die automatische Textklassifikation des überwachten maschinellen Lernens verbunden, um die wachsende Menge medial vermittelter Inhalte zu beschreiben, analysieren und vergleichen. Qualitätskriterien für die manuelle Inhaltsanalyse zielen auf Validität und Reliabilität ab, während sich Gütekriterien für die automatische Textklassifikation größtenteils mit Reproduzierbarkeit befassen. Zweifel daran, ob Textklassifikationsmodelle inhaltlich relevante Features lernen anstatt auf Scheinkorrelationen oder Artefakte im Datensatz trainiert zu werden, deuten auf ein Validitätsproblem für die automatische Inhaltsanalyse hin: Kommunikationswissenschaftliche Forschung, die diese Methode nutzt, muss sicherstellen, dass die automatische Textklassifikation nicht lediglich zuverlässig reproduziert, sondern gültige Ergebnisse liefert. Diese Arbeit bündelt epistemologische Differenzen in Sozialwissenschaften und Informatik und zeigt daraus resultierende Reibungspunkte im Umgang mit Theorie, Methodologie, Qualitätskriterien und dem Forschungsprozess in der Kommunikationswissenschaft und dem Machine Learning auf. Im Vergleich der Forschungsprozesse zeigt sich, dass das Kriterium der Erklärbarkeit im maschinellen Lernen als Streben nach Validität zu verstehen ist. Daraufhin wird geprüft, welche Erklärbarkeitsstrategien im maschinellen Lernen für eine Validitätsprüfung nutzbar gemacht werden können. Empfehlungen für eine Weiterentwicklung der automatischen Inhaltsanalyse umfassen die Entwicklung übergreifender Qualitätskriterien, eines interdisziplinären Forschungsprozesses und die Auseinandersetzung mit den grundlegenderen epistemologischen und methodologischen Konflikten.
O ensino superior nos tempos de pandemia
Authors: Vasconcelos Sinaida , Coelho Yuri , Alves Glenda
Published: February 2021

O presente artigo apresenta os resultados de um estudo realizado com professores de instituições de Ensino Superior da cidade de Belém, estado do Pará, no período de março a junho de 2020, momento em que o Brasil e todo o planeta enfrentavam o pico de uma pandemia que atingiu o sistema educacional e impactou drasticamente as práticas educativas. Assim, compreender como os professores vivenciaram essa experiência motivou essa investigação, que teve como objetivo analisar a percepção de professores do Ensino Superior sobre as experiências vivenciadas e os impactos no exercício da docência advindos da implementação do Ensino Remoto Emergencial durante a pandemia de COVID-19. Os procedimentos de coleta e análise dos dados combinam técnicas qualitativas e quantitativas. A coleta de dados ocorreu por meio de um questionário onlinepadronizado, com questões abertas e fechadas. Participaram do estudo 39 docentes do Ensino Superior que ministraram aula na modalidade remota no decorrer da pandemia de COVID-19. Os resultados do estudo sinalizam a percepção docente acerca da multiplicidade e diversidade de papéis que assumiram nessa intempestiva era digital, de tal forma que, mesmo diante do caos instalado pela falta de planejamento ou formação, evidenciou-se a grande e contínua capacidade de adaptação, criatividade e reinvenção desses profissionais da Educação, a despeito da obrigatoriedade imposta pela condição funcional dos respondentes – professores de faculdades privadas de Belém.
L’arbitrage Et La Compétence Exclusive De La Juridiction Etatique (Etude comparé)
Authors: Salih Al-omar Adnan
Published: February 2021

Lorsqu'une juridiction a obtenu de la loi compétence exclusive en certaines matières, aucune autre juridiction ne peut se prononcer sur les questions qui relèvent de cette compétence que la question ait été portée devant cette juridiction en tant que demande principale ou à titre de moyen de défense. La juridiction saisie doit donc surseoir à statuer jusqu'à ce que la juridiction ayant la compétence exclusive ait statué. Également, la compétence judiciaire exclusive est un critère souvent invoqué dans les droits étatiques pour constater l’arbitrabilité des litiges. L'arbitrage est seulement prohibé si la matière porte sur le contentieux ayant un caractère objectif et si les intérêts du tiers sont en jeu. Donc il est exclu dès qu’une matière ressort exclusivement de la compétence d’une juridiction de l’Etat. Aussi, la compétence judiciaire pour connaître d’une matière déterminée est considérée comme étant d’ordre public, donc inarbitrable.
К ВОПРОСУ ФИЗИЧЕСКОГО ОБОСНОВАНИЯ КРИТЕРИЕВ ЕДИНОЙ ТЕОРИИ ФИЗИКИ
Authors: Шабуневич В. , Шабуневич А.
Published: February 2021

With the help of harmonic analysis of different-scale finite element models of cubic and spherical cells, a physical substantiation of possible criteria for a unified theory of physics is presented, which consists in the fact that both with a decrease in cells from macroscopic to mesostatic and down to microscopic levels of deformation, and with an increase in cells from macroscopic to megascopic level, periodic changes in the number of resonance peaks of the deformation parameters of the cells are observed, which can explain various characteristic physical phenomena at different scale levels of deformation.
THE DARBOUX AND KOSHI PROBLEM FOR LINEAR HYPERBOLIC EQUATIONS WITH CONSTANT COEFFICIENTS
Authors: Usipbek Z. , Aubakir D. , Bexapar D. , Ashirkhan Zh. , Shekerbek A.
Published: February 2021

Many phenomena of mechanics, physics, and biology are reduced to the study of hyperbolic equations. In order to describe these phenomena completely, the Darboux problem is posed for hyperbolic equations, and for further studies, an explicit representation of the problem under consideration is necessary.

In this article discusses, we study the Darboux and Koshi problems for linear hyperbolic equations with constant coefficients.
Political Economy of Interculture Differences: An EU Perspective
Authors: Fatima Noor , Ashraf Muhammad Imran , Abdullah Ameer
Published: February 2021

Economic development is always linked with systematic changes in human behavior, its basic value and cultural change are paths dependent on it. The study illustrates the culture value that converges the EU into a single European value landscape. Current economic growth theories do not take into account cultural variables at national levels and economic life happens in asocial context and it affects economic development. This paper gives an overview of earlier relevant studies on cultural and economic growth and established linkage between cultural norms and its economic outcome from the EU perspective. The paper concludes that culture is ought to play a central role in devising the plan for the future of Europe. The paper suggests some recommendations that a new approach may be allowed with a change of mindset which should not practice the notion that what is not allowed is forbidden to what is not forbidden is allowed.
Constitutional Rights of Religious Minorities in Pakistan
Authors: Wilson Anita , Saeed Samina , Aziz Ur Rahman
Published: February 2021

The constitution of Pakistan defines our country as an "Islamic State". Pakistan is predominantly a State established for Muslims but many non-Muslims have been living here since its establishment. The constitution of Pakistan stands for equality and justice for all people regardless of caste, gender, religion, region and language. Qualitative methodology has been used. The available data will be taken from the various governmental institutions. In this research the researchers draw an Islamic Republic of Pakistan Constitutional scenario. It will not only shed light on the exact image of Pakistan's religious minorities, but it will also explain their freedom to follow their religion's teachings and pursue their customs and traditions.
Qu’est-ce qu’une constitution ? Principes et concepts
Authors: Bulmer Elliot
Published: February 2021

La série des Guides introductifs à l’élaboration d’une constitution d’IDEA International vise à assister l’élaboration ou la révision des constitutions, en aidant les citoyens, les partis politiques, les organisations de la société civile, les représentants et les membres des assemblées constituantes à prendre des décisions avisées dans ce domaine. Ces Guides introductifs donnent également des conseils au personnel des organisations internationales ainsi qu’aux autres acteurs extérieurs qui cherchent à fournir aux décideurs locaux un soutien technique adapté au contexte et étayé par des informations fiables. Chacun d’entre eux est conçu comme une introduction à l’intention de lecteurs non spécialistes, et constitue un aide-mémoire pratique pour les personnes disposant de connaissances ou d’une expérience préalable en matière d’élaboration d’une constitution. Les Guides introductifs, organisés par thématique en fonction des choix concrets que doivent faire les personnes responsables de l’élaboration ou de la révision d’une constitution, visent à expliquer des enjeux constitutionnels complexes de manière simple et brève.
A Systems Biology Approach for Hypothesizing the Effect of Genetic Variants on Neuroimaging Features in Alzheimer’s Disease
Authors: Golriz Khatami Sepehr , Domingo-Fernández Daniel , Mubeen Sarah , Hoyt Charles Tapley , Robinson Christine , Karki Reagon , Iyappan Anandhi , Kodamullil Alpha Tom , Hofmann-Apitius Martin
Published: February 2021

Background: Neuroimaging markers provide quantitative insight into brain structure and function in neurodegenerative diseases, such as Alzheimer’s disease, where we lack mechanistic insights to explain pathophysiology. These mechanisms are often mediated by genes and genetic variations and are often studied through the lens of genome-wide association studies. Linking these two disparate layers (i.e., imaging and genetic variation) through causal relationships between biological entities involved in the disease’s etiology would pave the way to large-scale mechanistic reasoning and interpretation. Objective: We explore how genetic variants may lead to functional alterations of intermediate molecular traits, which can further impact neuroimaging hallmarks over a series of biological processes across multiple scales. Methods: We present an approach in which knowledge pertaining to single nucleotide polymorphisms and imaging readouts is extracted from the literature, encoded in Biological Expression Language, and used in a novel workflow to assist in the functional interpretation of SNPs in a clinical context. Results: We demonstrate our approach in a case scenario which proposes KANSL1 as a candidate gene that accounts for the clinically reported correlation between the incidence of the genetic variants and hippocampal atrophy. We find that the workflow prioritizes multiple mechanisms reported in the literature through which KANSL1 may have an impact on hippocampal atrophy such as through the dysregulation of cell proliferation, synaptic plasticity, and metabolic processes. Conclusion: We have presented an approach that enables pinpointing relevant genetic variants as well as investigating their functional role in biological processes spanning across several, diverse biological scales.
RETRACTED: Oleocanthal protects against neuronal inflammation and cardiopulmonary bypass surgery-induced brain injury in rats by regulating the NLRP3 pathway
Authors: Liu Xiuye , Yang Lijuan , Wang Li , Guo Qiongmei
Published: February 2021

This article has been retracted, and the online PDF has been watermarked “RETRACTED”. A retraction notice is available at DOI: 10.3233/RNN-239001 .
An “all-in-one” wearable application for assisting children with Autism Spectrum Disorder
Authors: Koumpouros Yiannis
Published: February 2021

BACKGROUND:

Assistive technologies are playing a vital role in children with Autism Spectrum Disorder.

OBJECTIVE:

The current paper presents the design and assessment of an “all-in-one” wearable solution incorporating location monitoring, scheduling, communication, and physiological parameters monitoring functionalities for children with autism and their families/carers.

METHODS:

Twenty high-functioning children and twenty-five parents participated in the research. The final application was assessed over a period of two months. A highly patient-centred design was followed by a multidisciplinary team of experts (experts in the field of special education, speech therapy, psychology, and informatics) with significant experience in children with autism. The evaluation took place in a real and open environment. All participants were administered the PYTHEIA questionnaire in order to assess the various characteristics of the platform. Pearson’s Chi-squared test was used to examine the independence of the variables, with a statistical significance of 95%.

RESULTS:

The results support that the implemented features can effectively assist everyday life activities and facilitate the independent living of children with autism. The subjective evaluation of the solution revealed important considerations for further developments. Both groups of users (parents and children) were very satisfied with the implemented functionalities. The flexibility given by the PYTHEIA instrument was very important for the subjective assessment of the different functionalities of the solution. All examined axes were found excellent in terms of their adaptability in daily life activities.

CONCLUSIONS:

Real-world applications, able to run in an open and uncontrolled environment are critical for this population. PYTHEIA is a valuable instrument that supports the assessment of the device and application as a whole, as well as the evaluation of individual features and functions.
Quality improvement of general anteroposterior radiographic image of vertebral body according to optimum angle of incidence
Authors: Kwak Jong Hyeok , Lee Chi Hyung , Kim Gyeong Rip , Lee Sang Weon , Kim Young Ha , Song Geun Sung , Son Dong Wuk , Sung Hynu Chul , Kwak Jin Sung , Sung Soon Ki
Published: February 2021

OBJECTIVE: In this study, we present an appropriate angle of incidence to reduce the distortions in images of L4 and L5 during a general anteroposterior radiograph examination. METHOD: We selected 170 patients who had normal radiological findings among those who underwent anteroposterior and lateral examination for lumbar vertebrae. An optimum angle of incidence wa suggested through the statistical analysis by measuring the lumbar lordosis angle and the intervertebral disc angle in these 170 patients. RESULT: We suggested the incident angle (10.28°) of L4 and the incident angle (23.49°) of L5. We compared the distorted area ratios when the incident angle was 0°, 10°, and 23.5° using the ATOM® phantom. The ratio for the L4 decreased from 14.90% to 12.11% and that of the L5 decreased from 15.25% to 13.72% after applying the angle of incidence. We determined the incident angle (9.34°) of L4 and (21.26°) of L5 below 30° of LLA. Thus, we determined the incident angle (11.21°) of L4 and (25.73°) of L5 above 30° of LLA. CONCLUSION: When you apply the optimum angle of incidence, the distortion of image was minimized and an image between the joints adjacent to the anteroposterior vertebral image with an accurate structure was obtained. As a result, we were able to improve the quality of the image and enhance diagnostic information.
The Effectiveness of Problem Based Learning (PBL) Method Through Marquee Model to Cultivate Literacy
Authors: Diastuti Indah Mei , Sulton Agus
Published: February 2021

The aim of this study was to determine the effectiveness of the Problem Based Learning (PBL) method to cultivate students’ literacy. By using the marquee model, the students can focus on writing which would be the topic of problems that would be discussed through the PBL method. The method used a quasi experimental design. The result of this research showed that PBL method through Marquee media was effective to improve the literacy culture of students at Universitas Hasyim Asy’ari (UNHASY) Tebuireng Jombang. The literacy culture before using PBL method through Marquee was 75% of children rarely do literacy activities. After using PBL method through Marquee was 90% children often do literacy activities. Hence, it can be concluded that the problem basic learning (PBL) method through marquee can improve the students’ literacy culture of Indonesian language and literature education, mathematics education. Because there was an increase from 75% to 90% of students who like to read, this indicates that PBL through marquee was effective in improving literacy culture.

Keyword: Problem Based Learning, Marquee Model, Cultivate Literacy
Method calculating of uncertainty in evaluating the detailing coeffi cients of wavelet-conversion of profi le brightness image
Authors: Glukhova Natalija V.
Published: February 2021

The analysis of the relevance of the use of measurement methods based on obtaining visual data. The main problems that arise in automated image analysis systems in calculating the uncertainty of estimates of quantitative characteristics of images are identifi ed. Since modern methods of collecting and transforming visual data are characterized by great diversity, at the moment there are no general recommendations for calculating the uncertainty of estimates of their geometric and brightness parameters. The article is devoted to the development of a method for calculating uncertainty in evaluating the detailed coeffi cients of the wavelet transform, which is used in the automated analysis of images of gas-discharge radiation of water. The method based on recording gas-discharge radiation of water samples in an external pulsed electromagnetic fi eld was chosen to study the biological properties of water, since the formation of a gas discharge in the air gap between conductors directly depends on the presence of free charge carriers that can be simulated from the surface of the object under study. The number of free charge carriers determines the biological properties of water, since they affect the ability of drinking water to provide metabolic processes in living organisms by maintaining the normal course of redox reactions at the cellular level. To assess the biological properties of water and highlight the corresponding informative features of gas-discharge images, it is proposed to use the method of one-dimensional wavelet transform of the brightness profi le. A method for calculating the uncertainty in evaluating the detailed coeffi cients of the wavelet transform is considered. The proposed method for calculating the uncertainty is based on the results of repeated observations and allows us to estimate the uncertainty of the measurement results presented in the form of quantitative signs of images.
Taking into account the instability of the metrological characteristics of measuring instruments when choosing a verifi cation method
Authors: Doynikov Aleksandr C. , Hrapov Fedor I. , Yurov Lev V.
Published: February 2021

Using a comprehensive statistical simulation model, two methods of verifi cation were analyzed – rejection and graduation. The dependences of the maximum allowable instability of metrological characteristics on the measurements and the limits of measurement error of the standard, as well as on the verifi cation methods and the option of conformity assessment are obtained. It is proposed, when choosing the method of verifi cation of measuring instruments, to use the dependence of the instability of their metrological characteristics on the margin of error for various methods of verifi cation and confi rmation of compliance.
Method of metrological self-checking of a strain gauge pressure sensor
Authors: Larionov Vladimir A.
Published: February 2021

Existing methods of metrological self-monitoring of measuring sensors for temperature and pressure of technological industries are considered. The analysis of methods of metrological self-checking of strain gauge pressure sensors is carried out. Method is proposed based on measuring the supply voltage and voltage on the measuring diagonal of the bridge. The temperature of the strain gauge bridge is determined using a semiconductor thermistor installed near the bridge. This allows you to adjust the measured value of the total resistance of the bridge from the temperature of the bridge. With aging and exposure to external conditions, a change in the overall resistance of the bridge can be used to judge the error of the sensor. An experimental sample of the sensor was made. The failure of the strain gage bridge is simulated by parallel connection of an additional resistor to one of the shoulders of the bridge. Experimental studies have shown that modern technical means make it possible to assess the effect of changes in the total bridge resistance on the sensor error.
Estrogen and progesterone endometrial cell receptors in cows with subclinical endometritis
Authors: Basarab T. P. , Stefanyk V. Yu. , Koziorowski M. , Kozioł K. , Pilip A. R.
Published: February 2021

Pathological processes that strongly affect the uterine endometrium lead to infertility and abortion. The most common of these pathologies are clinical and subclinical endometritis. Subclinical endometritis is characterized by endometrial inflammation in the absence of clinical signs of endometritis. In this study, we used uterine samples obtained from Ukrainian black-and-white dairy cows aged 4 to 7 years to compare the histology of the uterine endometrium and changes in estrogen-α (ER-α), estrogen-β (ER-β) and progesterone (PgR) nuclear receptor sensitivity in cows with subclinical endometritis. Cows were separated based on cytological examination of the endometrium into a healthy group, or those presenting with subclinical endometritis. From these groups endometrial and epithelial tissue samples were obtained using biopsy forceps and an endoscope then analyzed using immunohistochemistry. Our results demonstrate that the sensitivity of ER-α and ER-β is lower while PgR sensitivity is elevated in cows with subclinical endometritis compared to the healthy control group. Additionally, we observed markedly altered histological changes characterized by enlargement of uterine glands, epithelial desquamation, and infiltration of leukocytes. These results suggest that there are significant changes in the endometrium linked to the sensitivity of nuclear steroid hormone receptors that may also play an immunoregulatory role in cows with subclinical endometriosis. While the interaction of steroid hormones and immunoregulation in the uterus remains to be elucidated, it may provide key insights into the uterine immune response.
A importância do Sistema Eletrônico de Informações – SEI, como mecanismo de gestão para otimização dos processos no Distrito Sanitário Especial Indígena Médio Purus
Authors: Santos Ediminilto Silva dos , Maduro Márcia Ribeiro , Santos Andreza Siqueira dos , Lima Orlem Pinheiro de , Araújo Paulo César Diniz de , Souza Andréa Lanza Cordeiro de , Oliveira Júnior Nilson José de
Published: February 2021

Este artigo tem como ênfase a importância do Sistema Eletrônico de Informações – SEI, que atua como mecanismo de gestão para otimização dos processos no Distrito Sanitário Especial Indígena Médio Purus. Neste contexto, busca-se responder qual a importância do SEI, como mecanismo de gestão, para otimização dos processos no Distrito Sanitário Especial Indígena Médio Rio Purus. A pesquisa justifica-se pela necessidade de avaliação do SEI como mecanismo de gestão, visto que é capaz de reduzir gastos com impressões e tornar mais célere a tramitação dos processos, tanto internamente como externamente. Tem-se, como objetivo central, avaliar a importância do SEI como mecanismo de gestão para otimização dos processos no Distrito Sanitário Especial Indígena Médio Rio Purus. Deste modo, os objetivos específicos visam: a) descrever como o SEI atua na gestão de processos administrativos; b) comparar o desenvolvimento das atividades de gestão por meio de processos físicos e por meio do SEI; c) avaliar quais aspectos do SEI foram alcançados com os propostos na implantação do programa. O trabalho foi desenvolvido a partir de uma pesquisa bibliográfica, de cunho descritivo, apoiando-se na abordagem quantitativa e qualitativa, e, assim, buscou-se explorar e explicar os principais impactos quanto ao uso de Sistemas Eletrônicos de Informações na gestão do Distrito Sanitário Especial Indígena Médio Rio Purus.
Nivel de conocimiento sobre técnica del electrocardiograma relacionado con interpretación básica por estudiantes de enfermería
Authors: Hurtado-de la Cruz Diana Cecilia , Moreno-Ortega Diana Janinne , Padilla- Briones Zandra Giselle , Reyes-Leos Juan Carlos , Rojas-González Carolina Elizabeth , Guerrero-Mojica Nery
Published: February 2021

Introducción: las enfermedades cardiovasculares en México son de las primeras causas de morbimortalidad. Los métodos diagnósticos son de gran importancia para realizar el diagnóstico y el tratamiento oportuno, con la ﬁnalidad de disminuir la probabilidad de muerte. Objetivo: correlacionar el nivel de conocimiento sobre técnica del electrocardiograma con su interpretación básica por estudiantes de Enfermería. Metodología: cuantitativo, correlacional, transversal y prospectivo. Quedaron incluidos 96 estudiantes de Enfermería de séptimo y octavo semestre, con dos instrumentos ex profeso, utilizando un paquete estadístico para el análisis de datos. Resultados: con respecto al nivel de conocimiento de la técnica del electro-cardiograma, un 52% de los individuos estudiados obtuvo un grado bueno de conocimientos, mientras que, para la variable de interpretación, el 53% de los participantes fueron categorizados como principiante-avanzado. Esto demuestra que los estudiantes de Enfermería requieren reforzar los conocimientos en cuanto al desarrollo en la técnica e interpretación del electrocardiograma. Conclusión: es necesario implementar estrategias para reforzar la adquisición de habilidades relacionadas con el conocimiento e interpretación básica del electro-cardiograma en los estudiantes de Enfermería.
Dynamic optimization analysis of hydraulic pipeline system based on a developed response surface method
Authors: QU Hongquan , SUN Jianlin , YAN Xu , ZHANG Yuanlin , LIU Xuefeng , YU Tao , HAN Huawei , XU Langjun
Published: February 2021

When designing a complex pipeline with long distance and multi-supports for offshore platform, it is necessary to analyze the vibration characteristics of the complex pipeline system to ensure that there is no harmful resonance in the working conditions. Therefore, the optimal layout of support is an effective method to reduce the vibration response of hydraulic pipeline system. In this paper, a developed dynamic optimization method for the complex pipeline is proposed to investigate the vibration characteristics of complex pipeline with multi-elastic supports. In this method, the Kriging response surface model between the support position and pipeline is established. The position of the clamp in the model is parameterized and the optimal solution of performance index is obtained by genetic algorithm. The number of clamps and the interval between clamps are considered as the constraints of layout optimization, and the optimization objective is the natural frequencies of pipeline. Taking a typical offshore pipeline as example to demonstrate the effectiveness of the proposed method, the results show that the vibration performance of the hydraulic pipeline system is distinctly improved by the optimization procedure, which can provide reasonable guidance for the design of complex hydraulic pipeline system.
Wind Turbine Speed Compound Control of a New-Type Wind-Electric Hybrid Power Pumping Unit
Authors: ZHANG Chunyou , WANG Lihua
Published: February 2021

Because the load of the oil beam pumping unit driven by pure electric motor changes sharply during operation, the power of the driving motor does not match and the energy efficiency is low. In this paper, a new type of wind-driven hydro-motor hybrid power system is proposed. The motor and the hydraulic motor are jointly driven, and the energy is recovered by a hydraulic pump with controllable displacement, so that the speed of the driving motor is relatively stable. In order to control the fan speed and keep up with the drastic changes of the outside wind speed, a control strategy of hybrid power system based on wind speed feed-forward compensation is proposed. Through simulation and experimental results, the following conclusions can be drawn: to begin with, the mathematic model is proved to be effective; next, simulation studies show that the proposed feed-forward control method can improve the response rate as well as reduce the response lag. This research can be a reference for the application of the feed-forward control method on the hybrid power system of beam pumping unit.system.
Research Advances of Typical Two Dimensional Layered Thermoelectric Materials
Authors: HUANG Haihua , FAN Xiaofeng
Published: February 2021

Thermoelectric technologies have caught our intense attention due to their ability of heat conversion into electricity. The considerable efforts have been taken to develop and enhance thermoelectric properties of materials over the past several decades. Recently, two-dimensional layered materials are making the promise for potential applications of thermoelectric devices because of the excellent physical and structural properties. Here, a comprehensive coverage about recent progresses in thermoelectric properties of typical two dimensional (2D) layered materials, including the theoretical and experimental results, is provided. Moreover, the potential applications of 2D thermoelectric materials are also involved. These results indicate that the development of 2D thermoelectric materials take a key role in the flexible electronic devices with thermoelectric technologies.
Effect of Carbides and γ/γ' Eutectic on Crack Initiation and Propagation in Ni-based Superalloy
Authors: QIN Junwei , CHEN Xiaohua , CHEN Kaixuan , YANG Xinghai , XIE Weiyang , WANG Yanlin , WANG Zidong
Published: February 2021

The Ni-based Udemit720Li superalloy tends to form large γ/γ' eutectic on grain boundaries (GBs) during solidification due to the addition of excessive Al and Ti elements, which provides convenience to study the effect of carbide and γ/γ' eutectic on crack initiation and propagation during tensile process. In this paper, Udemit720Li superalloy samples were prepared by induction melting casting method, arc melting and suction casting method. The microstructure, tensile properties and mechanism of crack initiation and propagation in Ni-based superalloy fabricated by two methods are investigated. The results exhibit γ/γ' eutectic accelerates the stress concentration at GB and thus leads to premature fracture failure. The samples with grain-boundary eutectic have higher strain hardening rate, but their cumulative and local misorientations are lower. For samples without eutectic at GB, the primary crack initiates at grain-boundary carbide along GB and extends along GB or into grain matrix, and exhibits better deformation performance and dislocation storage capacity within grains.
Análisis de indicadores económicos de turismo para la provincia de Pastaza enfocados al observatorio turístico “UEA”
Authors: Hernández Espinosa Cintia del Pilar , Cevallos Punguil Tania Cristina , Cifuentes Caiza Jaimar Andrea , Guerrero Escalante Odra Carolina
Published: February 2021

La presente investigación se enfoca en el Observatorio Turístico de la Universidad Estatal Amazónica, localizado en la ciudad de Puyo, provincia de Pastaza. El efecto dinamizador que proyecta el turismo sobre la economía es de notable importancia, dentro del estudio se incluye el impacto del turismo sobre el factor económico con las bases teóricas del sistema turístico diagramando su método de desarrollo en una economía globalizada que sintetiza la verdadera importancia del turismo, mediante una metodología cualitativa con un enfoque positivista para un estudio analítico-descriptivo, que promueve datos informativos objeto de crecimiento y dotación de información oportuna sobre diferentes ámbitos turísticos; la adecuada medición de datos turísticos estadísticos  son imprescindibles herramientas para ayudar en la planificación y entender procesos permitiendo adoptar estrategias con más posibilidades de éxito en la industria turística para incrementar su competitividad y garantizar sostenibilidad económica.
Evaluación de los recursos turísticos en Canasí.
Authors: Morales Blanco Adriana
Published: February 2021

El objetivo general de la presente investigación es evaluar los recursos presentes en una de las abras más bellas del mundo (Abras de Canasí, provincia de Mayabeque, Cuba) con un enfoque turístico. Para realizar la investigación se utilizan métodos como la revisión documental, la observación, el método Delphi, entrevistas a dirigentes, cuadros y especialistas, y se emplean herramientas como las fichas de inventario y jerarquización. El resultado final de la investigación lo constituye el completamiento y presentación de los recursos y atractivos turísticos inventariados, categorizados y jerarquizados en una ficha de inventario. Esto permitió definir su potencialidad, y las posibles oportunidades que estratégicamente puedan aprovecharse para la realización de acciones que consideren el desarrollo sustentable del área en un marco temporal a corto, mediano y largo plazos. Se logra demostrar el valor real que posee Canasí para el desarrollo del turismo en el litoral norte de Santa Cruz.
Holguín, la más hermosa: Proyección de desarrollo del destino turístico al 2030
Authors: Palao Fuentes Rosa Isidora , Cardet Fernández Evelina , Guerrero Rodríguez Yanitza
Published: February 2021

En la gestión del turismo, la combinación de las acciones inmediatas con la atención a los retos a más largo plazo, posibilita una mayor capacidad de respuesta ante las oportunidades y amenazas que, como actividad socioeconómica, ha de enfrentar el sector, pues nuevas formas de pensar que buscan mayor racionalidad propician la construcción de un nuevo proyecto de futuro autogenerador y multirrelacional. De ahí que en Cuba hoy es una prioridad lograr que la actividad turística tenga un crecimiento acelerado que permita dinamizar la economía, sobre la base de un programa de desarrollo eficiente. Holguín es una de las ocho regiones priorizadas en el país para el desarrollo del turismo internacional. Por ello, a partir de la indicación del Ministerio de Turismo, se elaboró en 1997 la Política de Desarrollo de la Región, para lo cual se partió del diagnóstico de la situación en aquel momento en las diferentes actividades. Al tomar en consideración las principales amenazas externas al destino, en el presente trabajo se expone el Programa de Desarrollo turístico de Holguín  2016 – 2030 que parte de un  escenario perspectivo medio y prevé llegar a más de quinientos mil visitantes al final del periodo, lo que permitirá alcanzar importantes ingresos, incluyendo lógicamente aspectos que en el lapso de los últimos 15 años han impactado en el desarrollo turístico de la provincia, así como las proyecciones y políticas a seguir hasta el 2030.
Programa para poner en valor de uso turístico atractivos del sistema cavernario del destino Gibara
Authors: Cardet Fernández Evelina , Batista Rodríguez Daniela Denisis , Menéndez Pérez Manuel
Published: February 2021

El desarrollo de la modalidad de turismo de naturaleza y su subproducto de aventura, constituyen actualmente una necesidad para el país, puesto que uno de sus fines es lograr ampliar y diversificar la cartera de productos existente. Sin embargo, existen territorios que presentan interesantes atractivos de esta índole que aún no han sido explotados. El municipio Gibara, es uno de los más hermosos de la provincia Holguín y cuenta con un gran potencial espeleoturístico. Es por ello, que la presente investigación aborda la modalidad anteriormente mencionada y su sostenibilidad, las particularidades de las prácticas espeleoturísticas, incluyendo el buceo en cavernas y su objetivo ha sido diseñar un programa para la puesta en valor de uso turístico del sistema cavernario en el destino Gibara. Para ello fue confeccionada una metodología que consta de cinco fases, diecisiete pasos y cuya aplicación permitió además diagnosticar la situación del sistema cavernario, proponer ámbitos de trabajo, indicadores y estrategias, así como, acciones para lograrlas; contribuyendo a erradicar los principales problemas que afectan directamente a las cuevas y cavernas, a la vez que se contribuye al enriquecimiento de la oferta turística del destino y al dinamismo de la vida de los pobladores locales, además de generar oportunidades para ellos.
Los riesgos costeros: Retos para el desarrollo sostenible del turismo en los territorios insulares en el contexto del cambio climático.
Authors: Pérez Figueredo Alexis Santiago
Published: February 2021

La consecución de un turismo sostenible que integre acciones destinadas a lograr el bienestar del turista y la armonía del desarrollo turístico con su entorno, teniendo como escenario la preparación y el enfrentamiento ante los impactos del cambio climático constituye el reto fundamental del turismo en los territorios insulares. El trabajo se desarrolla a partir de la revisión documental y bibliográfica, el método cartográfico y la modelación que permitió diseñar un procedimiento que contribuye al alineamiento en el modelo de gestión de las instalaciones turísticas de la implementación de la Tarea Vida potenciando el desempeño ambiental y la percepción del riesgo ante el cambio climático.  Como resultados se expresan las proyecciones del trabajo y se documenta el estudio de los impactos por los riesgos costeros, en lo fundamental la erosión y perdida de las dunas, con propuestas de acciones que se pueden realizar para su prevención y la protección costera ante los procesos de erosión potenciando el desarrollo de la gestión de riesgos en el Hotel Carisol los Corales en el sector costero Cazonal Baconao en la provincia de Santiago de Cuba.
La incidencia de los eventos científico técnicos en los activos intangibles de sus actores. Caso de estudio: pedagogía 2019
Authors: Sánchez Fernández Ailim
Published: February 2021

Los eventos como piezas comunicativas responden plenamente a la Sociedad de Conocimiento, y su efectividad para la adquisición de este se concreta en amplio grado en aquellos con temáticas científico técnicas. Sin embargo, si este beneficio es totalmente explicito para los participantes, no aparecen de igual forma textos o publicaciones de este impacto en los actores organizadores de los mismos. En Cuba, específicamente, se integran en la organización y ejecución de eventos científico técnico, entidades empresariales y públicas, turísticas y no turísticas, por lo que los beneficios económicos, tangibles aunque constituyan una exigencia económica del país, no son únicos, y los intangibles apuntan a una visión estratégica. Esta situación promueve el objetivo general de la investigación definido como Identificar los beneficios aportados por los eventos científico técnicos al desarrollo de los activos intangibles de sus actores y el destino La Habana, cuyo cumplimiento sustenta su aplicación en la XVI Edición del Congreso Internacional de Pedagogía como estudio de caso. Para el cumplimiento de este objetivo se emplearon métodos teóricos como el análisis bibliográfico y documental y empíricos como la aplicación de encuestas a eventistas y la realización de entrevistas a especialistas de los diferentes actores en la gestión de los eventos. Los resultados alcanzados conforman una pauta a seguir para la valoración de otros congresos con naturaleza similar y brindan visibilidad a la importancia de los eventos de esta naturaleza, al determinarse que contribuyen al desarrollo del capital humano, estructural y relacional de sus actores.
Gravitation modulation impact on MHD free convection flow of micropolar fluid
Authors: Sengupta Sanjib , Deb Reshmi
Published: February 2021

In this paper, a theoretical study is carried out on unsteady three dimensional, laminar, free convective flow of micropolar fluid with Hall effect, Joule heating and heat sink under gravitation modulation. A uniform transverse magnetic field is applied normal to the plate along the fluid region. The magnetic Reynolds number is considered to be small due to incomparability of applied and induced magnetic field, as such the influence of induced magnetic field can be neglected. The multi parameter perturbation technique is used to solve the governed dimensionless equations. The fluid velocity profile, temperature profile and the concentration profiles are discussed with the aid of graphs and tables. The coefficient of skin friction and couple stresses are numerically computed in addition to Nusselt number and Sherwood number. The result reveals that the linear velocity increases due to escalation in gravitation modulation parameter values but for intensification in values of gravitation modulation parameter, a reverse effect is observed for the rotational velocity. A comparative analysis shows that the skin friction coefficient is less in micropolar fluid than the corresponding Newtonian fluids.
Waste management of a maritime port-the case of Mongla port authority
Authors: Khondoker M. R. Hasan , Hasan K. R.
Published: February 2021

During voyage of a ship from one port to another, different types of wastes generated due to operation of the ship and livelihood of the crews, which fall under the scope of international convention for the prevention of pollution from ships, MARPOL 73/78. It is seen that almost 1000 nos. of ships are calling in to Mongla port every year which is gradually increasing day by day. However, there is no waste management system in the port now. IMO has recognized that provisions of proper wastes collection vessel as well as oil spill management vessel and reception facilities are crucial for effective MARPOL implementation in the maritime port. In view of the same, the feasibility of establishment of a standard and modern waste management system for Mongla port has been studied. First of all, amount of different types of wastes sourced from the shipping operation at the port of Mongla has been estimated following standard procedure and to facilitate the necessary services to incoming ships, a proposal has been made to procure a waste collection vessel, oil spill collection vessels and port reception and treatment facilities by Mongla Port Authority along with other necessary vessels and equipment. The procurement, operation and maintenance costs as well as revenue to be collected from the incoming ships for wastes quantities, alternative uses of the vessels and facilities and earnings from selling the product of the treatment have been examined. It is found from the study that the investment is technically, financially and economically viable.
Peristaltic pumping of Ellis fluid through a flexible tube with complete slip effects
Authors: Saravana R. , Sreenadh S. , Kumar P. Rajesh , Babu V. Ramesh
Published: February 2021

The paper investigates the role of complete velocity slip on the axisymmetric peristaltic transport of Ellis fluid through a uniform flexible tube considering the long wavelength and tiny Reynolds number assumptions. The equations governing the axisymmetric flow are solved and provided the analytical expressions for axial velocity, stream function, pressure difference for shear thickening and shear thinning fluids and the effect of emerging parameters on the pressure rise with time averaged flux and stream line patterns have been discussed graphically. The trapping phenomenon results showed that the size of trapping bolus enhances with increasing values of first and second slip parameters.