bluuebunny/crossref_metadata_2025 huggingface dataset:
Smartphone Usage Management System for Preventing Problematic Smartphone Use: Development and Evaluation Study (Preprint)
Authors: Lee Sun Jung , Choi Mun Joo , Yu Sung Hye , Kim Hyung Min , Park So Jin , Choi In Young
Published: December 2020

BACKGROUND

As the use of smartphones increases, mental health problems may be caused by problematic smartphone use. To prevent these problems, we need a method of self-management and intervention based on smartphone usage evaluation.

OBJECTIVE

The objective of this study was to develop the MindsCare application, featuring various interventions such as prevention and diagnosis of problematic smartphone use and communication between users and clinicians and to evaluate the usability and effectiveness of this system.

METHODS

We developed the application MindsCare that stores and manages smartphone usage data. Based on the usage data stored in the app, the user can manage their own smartphone use. The app can help prevent problematic smartphone use with personalized interventions. We recruited 342 Korean participants over the age of 20 and asked them to use MindsCare for 13 weeks. In addition, to evaluate the effectiveness of the MindsCare system, a study was conducted to evaluate the changes in average smartphone usage time and the usability of the app. We designed a usability evaluation survey questionnaire based on the Technology Acceptance Model and conducted factor and reliability analyses on the questionnaire responses. System usability was measured using three factors: behavioral intention, performance expectancy, and effort expectancy. At the 8th week of the study, participants were asked to respond to a survey on the usability of MindsCare.

RESULTS

When the MindsCare app usage experiment data were analyzed, the average smartphone usage time significantly decreased at the 8th week compared to the baseline (t =3.47, p =.001). The usability evaluations scores were generally high (average overall of 3.61 on a 5-point Likert scale; 3.40 for behavioral intention; 3.64 for performance expectancy; and 3.80 for effort expectancy).

CONCLUSIONS

MindsCare, developed in this study, is a smartphone usage management application that stores usage data stably and can help prevent problematic smartphone use through customized intervention and evaluation. We confirmed the smartphone usage time reduction effect and proved that MindsCare satisfies users because it received a high overall usability evaluation.
Tele–Mental Health for Reaching Out to Patients in a Time of Pandemic: Provider Survey and Meta-analysis of Patient Satisfaction (Preprint)
Authors: Mazziotti Raffaele , Rutigliano Grazia
Published: December 2020

BACKGROUND

The COVID-19 pandemic threatened to impact mental health by disrupting access to care due to physical distance measures and the unexpected pressure on public health services. Tele–mental health was rapidly implemented to deliver health care services.

OBJECTIVE

The aims of this study were (1) to present state-of-the-art tele–mental health research, (2) to survey mental health providers about care delivery during the pandemic, and (3) to assess patient satisfaction with tele–mental health.

METHODS

Document clustering was applied to map research topics within tele–mental health research. A survey was circulated among mental health providers. Patient satisfaction was investigated through a meta-analysis of studies that compared satisfaction scores between tele–mental health and face-to-face interventions for mental health disorders, retrieved from Web of Knowledge and Scopus. Hedges g was used as the effect size measure, and effect sizes were pooled using a random-effect model. Sources of heterogeneity and bias were examined.

RESULTS

Evidence on tele–mental health has been accumulating since 2000, especially regarding service implementation, depressive or anxiety disorders, posttraumatic stress disorder, and special populations. Research was concentrated in a few countries. The survey (n=174 respondents from Italy, n=120 international) confirmed that, after the onset of COVID-19 outbreak, there was a massive shift from face-to-face to tele–mental health delivery of care. However, respondents held skeptical views about tele–mental health and did not feel sufficiently trained and satisfied. Meta-analysis of 29 studies (n=2143) showed that patients would be equally satisfied with tele–mental health as they are with face-to-face interventions (Hedges g=−0.001, 95% CI −0.116 to 0.114, P=.98, Q=43.83, I2=36%, P=.03) if technology-related issues were minimized.

CONCLUSIONS

Mental health services equipped with tele–mental health will be better able to cope with public health crises. Both providers and patients need to be actively engaged in digitization, to reshape their reciprocal trust around technological innovations.
Analyzing Digital Evidence From a Telemental Health Platform to Assess Complex Psychological Responses to the COVID-19 Pandemic: Content Analysis of Text Messages (Preprint)
Authors: Hull Thomas D , Levine Jacob , Bantilan Niels , Desai Angel N , Majumder Maimuna S
Published: December 2020

BACKGROUND

The novel COVID-19 disease has negatively impacted mortality, economic conditions, and mental health. These impacts are likely to continue after the COVID-19 pandemic ends. There are no methods for characterizing the mental health burden of the COVID-19 pandemic, and differentiating this burden from that of the prepandemic era. Accurate illness detection methods are critical for facilitating pandemic-related treatment and preventing the worsening of symptoms.

OBJECTIVE

We aimed to identify major themes and symptom clusters in the SMS text messages that patients send to therapists. We assessed patients who were seeking treatment for pandemic-related distress on Talkspace, which is a popular telemental health platform.

METHODS

We used a machine learning algorithm to identify patients’ pandemic-related concerns, based on their SMS text messages in a large, digital mental health service platform (ie, Talkspace). This platform uses natural language processing methods to analyze unstructured therapy transcript data, in parallel with brief clinical assessment methods for analyzing depression and anxiety symptoms.

RESULTS

Our results show a significant increase in the incidence of COVID-19–related intake anxiety symptoms (P<.001), but no significant differences in the incidence of intake depression symptoms (P=.79). During our transcript analyses, we identified terms that were related to 24 symptoms outside of those included in the diagnostic criteria for anxiety and depression.

CONCLUSIONS

Our findings for Talkspace suggest that people who seek treatment during the pandemic experience more severe intake anxiety than they did before the COVID-19 outbreak. It is important to monitor the symptoms that we identified in this study and the symptoms of anxiety and depression, to fully understand the effects of the COVID-19 pandemic on mental health.
Nicaragua bajo el terror de la pareja Ortega-Murillo: antecedentes y construcción progresiva de una dictadura
Authors: Lacombe Delphine
Published: December 2020

El 18 de abril 2018, Nicaragua se sumergió en una de las crisis políticas y sociales más trágicas de su historia contemporánea. La firma de un decreto presidencial que reformaba el Instituto de Seguridad Social, reducía los beneficios de la jubilación y elevaba las contribuciones provocó una ola de protestas que se expandió por todo el país. El descontento devino rápidamente en una insurrección cívica bajo el reclamo de la renuncia presidencial y elecciones anticipadas, esta fue reprimida con enorme violencia. En este artículo se analizan las causas y factores que anuncian esta crisis política. Finalmente, se cuestiona la reacción tardía de la opinión pública internacional a la construcción gradual de un poder dictatorial en Nicaragua iniciada en 2007.Abstract: On April 18th 2018, Nicaragua plunged into one of the most tragic political and social crises of its contemporary history. Following a presidential decree reforming the Social Security Institute that reduced pension benefits while raising contributions, a wave of protest spread across the country. This wave became a civic insurrection demanding the president’s resignation and early elections and it was repressed with the utmost violence. This article summarizes the predictors and reasons for this political crisis. It finally questions the delayed reaction of international public opinion toward the progressive building of dictatorial power in Nicaragua, begun as early as 2007.Keywords: Nicaragua, Sandinism, Daniel Ortega-Rosario Murillo, Repression, dictatorship.Résumé : Le 18 avril 2018, le Nicaragua a basculé dans l’une des crises politiques et sociales les plus tragiques de son histoire contemporaine. À la suite d’un décret présidentiel réformant l’Institut de sécurité sociale pour diminuer les allocations des retraités tout en élevant les cotisations, une vague de contestation a gagné l’ensemble du pays. Celle-ci, devenue une insurrection civique demandant la démission présidentielle et des élections anticipées, fut réprimée avec la plus grande violence. L’article revient en synthèse sur les facteurs annonciateurs et les raisons de cette crise politique. Il interroge finalement la réaction tardive de l’opinion publique internationale face à l’édification progressive d’un pouvoir dictatorial au Nicaragua, lancée dès 2007.Mots-clés : Nicaragua, sandinisme, Daniel Ortega-Rosario Murillo, répression, dictature.
El agua en la percepción mazahua: Ecofilosofía y narrativa de la naturaleza / Water in Mazahua perception: Ecophilosophy and narrative of nature
Authors: Figueroa Serrano David
Published: December 2020

Diversas sociedades han concebido a la naturaleza como un todo integral, una entidad viva. Esta perspectiva ontológica es una forma del ser en el mundo y representa otros caminos de la convivencia con el entorno. Este texto busca aportar elementos para entender la lógica de la percepción del agua en los pueblos mazahuas del Estado de México, a partir de referentes cosmológicos. Desde la perspectiva de la ecofilosofía, estas formas de asumir el entorno nos permiten repensar nuestros fundamentos epistémicos sobre la naturaleza. Metodológicamente, se realizó trabajo de campo en las comunidades mazahuas de la región noroccidente y occidente del Estado de México, principalmente se retomaron localidades cercanas a los ríos Lerma y Cutzamala. A partir de entrevistas a profundidad, recorridos de área e información documental se identificó la percepción del agua, así como los diferentes conflictos por los recursos hídricos y los proyectos de trasvase.Abstract: Various societies have designed nature as an integral whole and as a living entity. This ontological perspective is a form of being in the world and represents other paths of coexistence with the environment. This text seeks to provide elements to understand the perception of water in the Mazahua people of the State of Mexico, from cosmological references. From the perspective of ecophilosophy, these cosmological referents are necessary to rethink our epistemic foundations on nature. Methodologically, fieldwork was carried out in the Mazahua communities of the northwestern and western region, mainly in localities near the Lerma and Cutzamala rivers. Based on in-depth interviews, area tours and documentary information, the perception of water was identified, as well as the different conflicts over water resources and diversion projects.Keywords: water; Indigenous people; ontologies of nature; ecophilosophy; oral narrative.Résumé : Diverses sociétés ont conçu la nature comme un tout intégral, une entité vivante. Cette perspective ontologique est une manière d’être dans le monde et représente d’autres voies de coexistence avec l’environnement. Ce texte cherche à fournir des éléments pour comprendre la logique de la perception de l’eau chez les peuples Mazahua de l’État du Mexique à partir de références cosmologiques. Du point de vue de l’écophilosophie, ces les façons d´assumer l´environnement, nous permettent de repenser nos fundements épistémiques sur la nature. Méthodologiquement, des travaux de terrain ont été effectués dans les communautés Mazahua du nord-ouest et de l’ouest du pays, principalement dans les localités proches des rivières Lerma et Cutzamala. À partir d’entretiens approfondis, de visites de zones et d’informations documentaires, la perception de l’eau a été identifiée, ainsi que les différents conflits liés aux ressources en eau et aux projets de dérivation.Mots-clés : l’eau ; peuples autochtones ; ontologies de la nature ; écophilosophie ; récit oral.
Лазерно-интерференционные системы исследования цунамигенных землетрясений
Authors: Долгих Г.И. , Долгих С.Г.
Published: December 2020

Описаны особенности применения лазерных деформографов и лазерных измерителей вариаций гидросферного давления при регистрации цунамигенных землетрясений и ими порождаемых сигналов. При анализе записей различных цунамигенных землетрясений лазерных деформографов рассматриваются перспективы создания систем предупреждения цунами.
ALTERNATIF SISTEM SADAP KLON RRIC 100 MULAI BUKA SADAP
Authors: Herlinawati Eva , Kuswanhadi Kuswanhadi
Published: December 2020

Stimulan etefon atau gas telah umum digunakan pada perkebunan, khususnya di perkebunan besar. Penggunaan stimulan harus dikombinasikan dengan penurunan intensitas penyadapan melalui pengurangan panjang irisan sadap. Penelitian bertujuan untuk membandingkan dan mengevaluasi pengaruh berbagai sistem sadap terhadap produksi dan parameter fisiologi sejak buka sadap. Penelitian dilaksanakan di Kebun Percobaan Balai Penelitian Sembawa mulai Maret sampai Desember 2011. Penelitian disusun berdasarkan Rancangan Acak Kelompok dengan 6 perlakuan sistem sadap  dan 8 ulangan, menggunakan klon RRIC 100 tahun tanam 2004. Perlakuan antara lain S/2 d3, S/2 d3 ET2.5% Ga1 12/y (m), S/2 d3 ET2.5% Ga1 24/y (2w), Sc20 U d3 ETG 12/y(m), Sc20 U d3 ETG 24/y(2w), dan Sc20 U d3 ET2.5% Ba1 24/y(2w). Hasil penelitian menunjukkan sistem sadap S/2 d3 ET2.5% Ga1 12/y (m) atau Sc20 U d3 ETG 12/y(m) mampu meningkatkan produksi tanpa menimbulkan pengaruh negatif terhadap karakter fisiologi. Namun demikian, penggunaan stimulan gas pada tanaman muda perlu pertimbangan risiko kering alur sadap. Penyadapan ke arah atas memiliki kecenderungan lebih tebal dalam konsumsi kulit dan tumpahnya lateks dari alur sadap, penyadap sebaiknya dilatih dengan baik. Diterima : 10 Mei 2013; Disetujui : 13 September 2013  How to Cite : Herlinawati, E., & Kuswanhadi. (2013). Alternatif sistem sadap klon RRIC 100 mulai buka sadap. Jurnal Penelitian Karet, 31(2), 102-109. Retrieved from http://ejournal.puslitkaret.co.id/index.php/jpk/article/view/137
DAMPAK RENDAHNYA HARGA KARET TERHADAP KONDISI SOSIAL EKONOMI PETANI KARET DI SUMATERA SELATAN
Authors: Syarifa Lina Fatayati , Agustina Dwi Shinta , Nancy Cicilia , Supriadi Muhammad
Published: December 2020

Rendahnya harga karet telah memberikan berbagai dampak terhadap kondisi sosial ekonomi petani karet di Sumatera Selatan (Sumsel) dikarenakan lebih dari 40% penduduk Sumsel menggantungkan hidupnya dari komoditas karet. Tulisan ini menguraikan hasil penelitian mengenai dampak turunnya harga karet terhadap kondisi sosial ekonomi petani karet di Sumatera Selatan. Kegiatan penelitian dilakukan di Provinsi Sumatera Selatan pada tahun 2014. Penelitian dilakukan dengan metode survei dengan mengambil sampel petani karet yang dipilih secara acak. Selanjutnya secara sengaja dipilih sampel penangkar bibit karet,  perusahaan leasing kendaraan,  dealer kendaraan bermotor serta  perusahaan leasing dan toko elektronik dan furniture di sekitar wilayah sentra karet di Sumatera Selatan. Hasil penelitian menunjukkan bahwa turunnya harga karet saat ini telah memberikan dampak yang mengakibatkan turunnya pendapatan petani per bulan, turunnya kemampuan investasi petani, turunnya daya beli petani, serta pengalihan sumber penghasilan petani kepada sumber penghasilan selain usahatani karet.  Bahkan telah terjadi pengalihan fungsi lahan dari usahatani karet ke tanaman lain yang dinilai petani lebih prospektif. Oleh karena itu diperlukan upaya-upaya agar bisa bertahan dalam kondisi harga karet yang rendah saat ini. Diterima : 5 Agustus 2015 / Direvisi : 3 Februari 2016 / Disetujui : 1 April 2016 How to Cite : Syarifa, L., Agustina, D., Nancy, C., & Supriadi, M. (2016). Dampak rendahnya harga karet terhadap kondisi sosial ekonomi petani karet di Sumatera Selatan. Jurnal Penelitian Karet, 34(1), 119-126. Retrieved from http://ejournal.puslitkaret.co.id/index.php/jpk/article/view/218
Stress-strain state of shell of revolution analysis by using various formulations of three-dimensional finite elements
Authors: Gureeva Natalia A. , Klochkov Yuriy V. , Nikolaev Anatoly P. , Yushkin Vladislav N.
Published: December 2020

The aim of the work is to perform a comparative analysis of the results of analyzing arbitrarily loaded shells of revolution using finite element method in various formulations, namely, in the formulation of the displacement method and in the mixed formulation. Methods. To obtain the stiffness matrix of a finite element a functional based on the equality of the actual work of external and internal forces was applied. To obtain the deformation matrix in the mixed formulation the functional obtained from the previous one by replacing the actual work of internal forces in it with the difference of the total and additional work was used. Results. In the formulation of the displacement method for an eight-node hexahedral solid finite element, displacements and their first derivatives are taken as the nodal unknowns. Approximation of the displacements of the inner point of the finite element was carried out through the nodal unknowns on the basis of the Hermite polynomials of the third degree. For a finite element in the mixed formulation, displacements and stresses were taken as nodal unknowns. Approximation of the target finite element values through their nodal values in the mixed formulation was carried out on the basis of trilinear functions. It is shown on a test example that a finite element in the mixed formulation improves the accuracy of the strength parameters of the shell of revolution stress-strain state.
Modern interpretation of Saint-Venant’s principle and semi-inverse method
Authors: Zveryaev Evgeny M.
Published: December 2020

Relevance. The progressive development of views on the Saint-Venant formulated principles and methods underlying the deformable body mechanics, the growth of the mathematical analysis branch, which is used for calculation and accumulation of rules of thumb obtained by the mathematical results interpretation, lead to the fact that the existing principles are being replaced with new, more general ones, their number is decreasing, and this field is brought into an increasingly closer relationship with other branches of science and technology. Most differential equations of mechanics have solutions where there are gaps, quick transitions, inhomogeneities or other irregularities arising out of an approximate description. On the other hand, it is necessary to construct equation solutions with preservation of the order of the differential equation in conjunction with satisfying all the boundary conditions. Thus, the following aims of the work were determined: 1) to complete the familiar Saint-Venants principle for the case of displacements specified on a small area; 2) to generalize the semi-inverse Saint-Venants method by finding the complement to the classical local rapidly decaying solutions; 3) to construct on the basis of the semi-inverse method a modernized method, which completes the solutions obtained by the classical semi-inverse method by rapidly varying decaying solutions, and to rationalize asymptotic convergence of the solutions and clarify the classical theory for a better understanding of the classic theory itself. To achieve these goals, we used such methods , as: 1) strict mathematical separation of decaying and non-decaying components of the solution out of the plane elasticity equations by the methods of complex variable theory function; 2) construction of the asymptotic solution without any hypotheses and satisfaction of all boundary conditions; 3) evaluation of convergence. Results. A generalized formulation of the Saint-Venants principle is proposed for the displacements specified on a small area of a body. A method of constructing asymptotic analytical solutions of the elasticity theory equations is found, which allows to satisfy all boundary conditions.
The Role of State Corporations in the Russian Economy (as in the Case of “Rosatom” and “Rostec” State Corporations)
Authors: Ergashev Akmaljon S. , Maslennikova Elena V.
Published: December 2020

The article is devoted to the study of the role of state corporations in the economy of the Russian Federation as in the case of Rosatom and Rostec. The authors analyze the existing concept of state corporation, Russian and foreign practices. The article presents the results of the research of economic features based on reports published on official website of Russian state corporation, as well as prospects of Russian state corporations are identified. At the present stage of development and operation of Russian state corporations, society increasingly sees their products, but it doesnt even suspect that these are domestic products that meet all international standards, which are also exported to many countries of the world. Products, goods and services are exported to North and South America, Europe, Central and South-East Asia, and Africa. In a relatively short period of existence and operation, Russian state corporations have increased their revenues and have made a significant contribution to the prosperity of countrys economy.
Optimization of the Implementation of Village Government in Indonesia
Authors: Setiawan Refly , Melinda Esti
Published: December 2020

The issuance of Law of the Republic of Indonesia No. 6 of 2014 concerning Villages, positioning villages as the spearhead of national development. The existence of a village law also provides clarity about the position and the authority of the village government in managing village household affairs. The regulation also regulates government policies regarding the allocation of village funds which allows them to be used to develop their potential. In addition, the village policy gives villages a source of funds and adequate authority to improve the welfare of the village community. Regulations that provide substantial authority and responsibility to villages must certainly be balanced with the implementation of village governments that are able to commit to running good governance. In implementing the policy, it turns out that there are still cases of misappropriation of the allocation of village funds by the village government apparatus. This paper will explain the analysis related to the importance of village governance in implementing the Law of the Republic of Indonesia No. 6 of 2014 using the rational bureaucracy theory put forward by M. Weber.
Social and Political Consequences of the Pandemic for the Russian Orthodox Church
Authors: Lunkin Roman N.
Published: December 2020

In the article analyzed the social and political consequences of pandemic of coronavirus for the Russian Orthodox Church in the context of the reaction of different European churches on the quarantine rules and critics towards the church inside Russia. The author used the structural-functional and institutional approaches for the evaluation of the activity of the Russian Orthodox Church, was analyzed the sources of mass-media and the public claims of the clergy. In the article was made a conclusion that Orthodox Church expressed itself during the struggle with coronavirus as national civic institute where could be represented various even polar views. Also the parish activity leads to the formation of the democratic society affiliated with the Church and the role of that phenomenon have to be explored in a future. The coronacrisis makes open the inner potential of the civic activity and different forms of the social service in Russian Church. In the same time pandemic provoked the development of the volunteer activity in the around-church environment and also in the non-church circles among the young people and the generation of 40th age where the idea of the social responsibility for themselves and people around and the significance of the civil rights was one of the popular ideas till 2019. The conditions of the self-isolation also forced the clergy to struggle for their parishioners and once again renovate the role of the church in the society and in the cyber space.
The Transformation of Radical Islam in a Post-Industrial Society
Authors: Demidenko Sergey V. , Kutuzova Anastasia A.
Published: December 2020

In a post-industrial society, radical Islam has undergone significant evolutionary changes, that contributed to its transformation from a religious ideology to a political one. The key element of the updated doctrine was the idea of creating a world Islamic state - caliphate - through global jihad. This article explores a new stage in the history of the phenomenon of Islamic radicalism, which has developed outside the Muslim world, where it has acquired features of a specific subculture. Global jihad is gaining popularity among young Muslims in Europe, the US, and Southeast Asia. A variety of cultural manifestations of Islamism, united by the term jihadi-cool, form an attractive image of a Salafist-jihadists through a special manner of clothing, new types of music (jihad rap and jihad rock), etc. Members of this subculture tend to join terrorist organizations, spread radical ideas among young people and attract new supporters. One of the most important causes of the radicalization of Muslims in Europe and the Americas is considered to be the complex socio-economic and cultural preconditions created by Western policies towards the States of the Middle East and the local Muslim diaspora. As part of the research, a historical-genetic analysis of the evolutionary transformations of Islamic radicalism has been conducted. The statistical method has been used to track the number of terrorist acts in the EU and the USA. Content analysis has been applied in the article in order to examine lyrics of jihad-rap musical compositions. The interdependence of jihad-rap popularity and the general interest in the ideology of jihad has been assessed based on the analysis of statistics of search queries. Biographical methods have been used to study the relationship between belonging to a jihadist subculture and joining radical Islamic organizations. The results of the study demonstrate, first of all, the high adaptability of Islamic radicalism to the changing conditions of the global world. Secondly, they indicate the specific evolution of a phenomenon that gradually overcomes sectarian differences. And third, they note increasing prevalence of this destructive doctrine in Europe, USA, South and Southeast Asia. All the results confirm that Islamic radicalism is not a local phenomenon, but a real threat to global political stability.
Excavaciones en los cementerios protopasto de Miraflores-Nariño
Authors: Uribe Maria Victoria , Lleras P. Roberto
Published: December 2020

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Implicaciones educativas de los hábitos de lectura en el comportamiento académico del estudiantado universitario a distancia
Authors: Arguedas-Ramírez Ligia
Published: December 2020

El artículo que se presenta forma parte de la investigación: Estudio exploratorio sobre los hábitos de lectura entre la población estudiantil de la Universidad Estatal a Distancia (UNED), Costa Rica.  Se exponen aspectos relacionados con las implicaciones educativas de los hábitos lectores de los estudiantes en su comportamiento académico dentro del ámbito universitario a distancia, con las características de esta modalidad educativa y las competencias de carácter académico esperadas en el estudiantado; por ejemplo, la autogestión del aprendizaje, las relaciones de la persona docente-estudiante y la mediación de la formación profesional, así como el uso didáctico de las diferentes tecnologías de la información y la comunicación.  Igualmente, se hace referencia a los hábitos lectores del estudiantado desde su significación e impacto en el rendimiento y la calidad de la preparación en cualquier campo de estudio, mediante nuevas pautas de lo que es ser lector en el mundo universitario actual. Se observan aquellas variables de la investigación que pueden ampliar las perspectivas y el análisis sobre la práctica lectora como desafío en la educación superior y a distancia, así como aspectos relacionados con la metodología, los participantes, los instrumentos y los procedimientos.
Congruência Semântica: implicações didáticas no ensino da regra dos sinais
Authors: Hillesheim Selma Felisbino , Thadeu Moretti Méricles
Published: December 2020

O ensino da regra dos sinais, sob o ponto de vista didático, encontra problemas. O modelo comercial, muito utilizado para o ensino das propriedades aditivas, pode contribuir para a formação de obstáculos para o ensino das propriedades multiplicativas dos inteiros relativos. O modelo comercial encontra no fenômeno da congruência semântica, que é um fenômeno semiótico e cognitivo que mede o grau de transparência entre duas representações semióticas, uma forte oposição por conta de uma associação codificada entre verbos e sinais. Trata-se de uma pesquisa qualitativa, propondo-se a analisar a congruência semântica em situações de ensino da regra dos sinais numa turma do 7o ano do ensino fundamental. Como resultado, aponta-se que as situações de ensino em que a congruência semântica se destacou da equivalência referencial, exigiu um custo cognitivo maior quando comparado aos casos em que a congruência semântica incidiu com a equivalência referencial. Percebe-se que o nível de transparência entre duas representações semióticas precisa ser considerado no processo de ensino e aprendizagem da regra dos sinais.
Empowering Women Ex-Migrant Workers and Domestic Violence Victims through Komunitas Perempuan Singkong Jaya
Authors: Chawa Anif Fatma , Budi Nugroho Arief , Sutopo Dhanny Septimawan
Published: December 2020

This article seeks to understand the empowerment of women ex-migrant workers who have faced various problems before, during and after going back to the homeland as ex-migrant workers. These problems include unemployment, family’s affairs, exploitation, discrimination and domestic violence. Komunitas Perempuan Singkong Jaya has been established to carry out empowerment programs to overcome these problems. The purpose of this study is to identify the needs as well as the problems that hinder the implementation of the programs and seeks to find the solutions. This study employs descriptive qualitative approach to examine the implementation of the development programs which have been conducted by Komunitas Perempuan Singkong Jaya located in Desa Sukowilangun, Kec. Kalipare, Kab. Malang. Based on the findings, there are several problems in the implementation of development programs, including the lack of capital and facilities, packaging and marketing, as well as product license problems. Addressing these problems, some intervention programs have been conducted, including training and funding which have generated intended outputs. However, this study also found that the change in lifestyle of these women ex-migrant workers has resulted in their being reluctant to be involved in the development programs.
Leveraging on Industrial and Occupational Safety to Enhance the Dwindled National Economy After Ravages Done by COVID-19 Pandemic Using
Authors:   Imo State Polytechnic, Umuagwo, Nigeria, Osuchukwu C.I , Meremikwu B.C , Obaseki E , Onuoha B , Unuogu C.C
Published: December 2020

This piece of Review tries to remind as many of us that are stake-holders in the business of using science and engineering (Technology) to help man in his everyday work, the necessity of the conscious knowledge and constant application of the rules of Health, Safety and Environment Management System which calls for a holistic corrective and proactive measures that mitigate against the effects of undesirable effects which result from accident. It emphasizes on the need for personnel to be oriented on the rudiments of accident occurrences and preventions which are born out in a rooted knowledge of Hazard identification, analysis control, Risk management and Accident contingency management. The overall interest of this work gears towards awakening individual’s with Dos and Don’ts that will be in consonance with the national and international best safety rules and practices especially our local work places. Keywords: Safety, Accident, Hazards, HEMP, Contingency Management, Risk Management
Drying characteristics of blue mussels by traditional methods
Authors: Kipcak Azmi , Derun Emek , Tugrul Nurcan , Doymaz İbrahim
Published: December 2020

In this study, characteristic drying behaviour and kinetics of blue mussels, which were dried with the traditional methods of cabinet-type, oven and vacuum oven drying, are studied. In a cabinet-type dryer there is air flow while in an oven dryer there is no air flow. In each method, Deff and Ea are calculated and colour analyses are done. According to the results, mussels are dried between 270-120 min, 570-300 min and 390-210 min, for the cabinet-type dryer, oven and vacuum oven, respectively. In each method, the Midilli and Kucuk model best fits experimental data with high coefficient of determination (R2) between 0.9995-0.9984, 0.9996-0.9993, and 0.9997-0.9993 for cabinettype, oven and vacuum oven dryer, respectively. Deff values were calculated between 1.89-4.94?10-9 m2/s, 0.89-1.63?10-9 m2/s and 1.17-2.28?10-9 m2/s for cabinet-type dryer, oven and vacuum oven methods, respectively. Also, Ea values were found to be 46.90, 29.57 and 32.85 kJ/mol, for cabinet-type dryer, oven and vacuum oven methods, respectively. The colour change was slightly affected by the change in the temperature.
On inversion in the case of the fundamentally finite integrable Vekua complex differential equation
Authors: Canak Milos , Albijanic Miloljub
Published: December 2020

The class of so called fundamentally finite integrable Vekua CDE is defined
using the fixed point of the inversion and where one solution is equal to
the coefficient of the equation. Then the different manifestations of
inversion in relation to the general solution, an arbitrary analytical
function inside and the core of the coefficient are examined. It shows that
all the major problems of the Vekua equation theories, including boundary
value problems can be interpreted and solved using the principle of
inversion. The main significance of the fundamentally finite integrable
Vekua equation is that the real and imaginary part of the solution can be
separated, which in many mechanical and technique problems have certain
physical meanings.
Size Effect Analysis of Concrete Beams Under Bending Using Crack-Band Approach
Authors: AYHAN Bahar , LALE Erol , ÇELİK Nilay
Published: December 2020

Analysis of size effect phenomenon in quasi-brittle materials is presented in this research using damage plasticity model. Notched and unnotched specimens under three-point bending fracture test are analyzed by setting a 3D finite element model. For this purpose, Abaqus software is utilized. Concrete damage-plasticity model (CDPM) enhanced with crack band approach is used to conduct simulations of concrete specimens. The efficiency of this model is investigated especially for size effect phenomenon. 2D finite element model is setup for three-point bending beams in order to estimate fracture parameters for specific span to depth ratio, L/D=2.176. The simulations are conducted for each different notch depths. 8-node quadratic plane stress elements are used to define 2D domain and singularity field at the notch tip is modeled using quarter point technique. Energy release rate is calculated using J-integral approach. Obtained results are compared to experimental ones reported in literature and are also compared to the Bazant’s size effect law. This study shows that concrete damage-plasticity model enhanced with crack band approach can capture size effect observed in concrete-like materials’ fracture.
ASPECTS OF ARCHITECTS AND THEATRICAL DESIGNERS COOPERATION
Authors:   Ryerson University, School of Performance, P. Bosyy , V. Proskuryakov ,   Lviv Polytechnic National University, Department of Architectural Environment Design
Published: December 2020

According to the results of the student Ukrainian - Canadian seminar in Lviv, 2017, on the renovation of the hall of the First academic building of “Lviv Polytechnic” with the expansion of theatrical-entertaining and cultural-educational functions the features of cooperation of theatrical architects and theatrical designers are highlighted.
THE ROLE AND MEANING OF SACRAL BUILDING IN THE PROCESS OF EVOLUTION OF ARCHITECTURAL AND PLANNING STRUCTURE OF GALICIAN TOWNS FOUNDED IN THE SECOND HALF OF THE 16TH – 17TH CENTURY (EVIDENCE FROM ARTISTIC HERITAGE OF VASYL NAHIRNYI)
Authors:   Lviv polytechnic national university, Department of Design and Basics of Architecture, S. Topylko
Published: December 2020

The article outlines evolutionary stages of the architectural and planning structure of Galician towns founded in the second half of the 16th – 17th century from the moment of their foundation until now. It was established that sacral buildings present the most stable elements of the planning structure and act as compositional dominants.
Antioxidant Potential of Novel Designed Phenolic Derivatives: Computational Insights
Authors:   Department of Chemistry, Faculty of Science, University of Kelaniya, Kelaniya 11600, Sri Lanka, Pandithavidana Dinesh R. , Hewage Kushani S. K. ,   Department of Chemistry, Faculty of Science, University of Kelaniya, Kelaniya 11600, Sri Lanka
Published: December 2020

Density functional theory calculations were applied for designed phenolic antioxidant derivatives. The reaction enthalpies related to various mechanisms of primary antioxidant action were deliberated in detail. How antioxidant activity of designed phenolic compounds has been perturbed by electron donor and withdrawing substituents present at ortho, meta and para positions, allylic conjugation and the dimerization effect were computed.
Biosynthesis and Characteristics of Polyhydroxyalkanoates. 1. Polyhydroxybutyrates of Azotobacter vinelandii N-15
Authors:   Department of PhChFF InPOCC NAS of Ukraine 3a, Naukova St., 79060 Lviv, Ukraine, Semeniuk Ihor , Pokynbroda Tetyana ,   Department of PhChFF InPOCC NAS of Ukraine 3a, Naukova St., 79060 Lviv, Ukraine, Kochubei Viktoria ,   Department of PhChFF InPOCC NAS of Ukraine 3a, Naukova St., 79060 Lviv, Ukraine, Midyana Halyna ,   Department of PhChFF InPOCC NAS of Ukraine 3a, Naukova St., 79060 Lviv, Ukraine, Karpenko Olena ,   Department of PhChFF InPOCC NAS of Ukraine 3a, Naukova St., 79060 Lviv, Ukraine, Skorokhoda Volodymyr ,   Lviv Polytechnic National University, 12, Bandery St., 79013 Lviv, Ukraine
Published: December 2020

The biosynthesis of cellular polymers of Azotobacter vinelandii N-15 strain using molasses as a carbon source has been optimized. The highest yield of polymer (25.8 % of cell mass) was obtained on a nutrient medium with a molasses concentration of 50 g/l. Using TL-chromatography and IR-spectroscopy the obtained product was identified as polyhydroxybutyrate (PHB), and its properties were investigated. The wetting contact angle was used to characterize the biopolymer film surface properties. According to the results of thermal and thermomechanical studies, it was found that the obtained РHB is characterized by a high thermal stability and heat resistance: the melting point is 462 K; deep destruction and thermooxidative processes begin at the temperatures above 567 K.
A New Green Catalyst for Synthesis of bis-Macromonomers of Polyethylene Glycol (PEG)
Authors:   Oran1 University Ahmed Benbella BP N° 1524 El M’Naouar, 31000 Oran, Algeria, Haoue Sara , Derdar Hodhaifa ,   Oran1 University Ahmed Benbella BP N° 1524 El M’Naouar, 31000 Oran, Algeria,   Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques (CRAPC), BP 10 384, Siège ex-Pasna Zone Industrielle, Bou-Ismail CP 42004, Tipaza, Algeria, Belbachir Mohammed ,   Oran1 University Ahmed Benbella BP N° 1524 El M’Naouar, 31000 Oran, Algeria, Harrane Amine ,   Oran1 University Ahmed Benbella BP N° 1524 El M’Naouar, 31000 Oran, Algeria,   Department of Chemistry, FSEI University of Abdelhamid Ibn Badis – Mostaganem, Algeria
Published: December 2020

A new method to synthesise polyethylene glycol dimethacrylate (PEGDM) with various molecular weights (1000, 3000, 6000 and 8000 g/mol) of polyethylene glycol (PEG) has been developed. This technique consists in using Maghnite-H+ as eco-catalyst to replace еriethylamine, which is toxic. Maghnite-H+ is a proton exchanged montmorillonite clay which is prepared through a simple exchange process. Synthesis experiments are performed in solution using dichloromethane as solvent in the presence of methacrylic anhydride. The effect of reaction time, temperature, amount of catalyst and amount of methacrylic anhydride is studied in order to find the optimal reaction conditions. The synthesis in solution leads to the best yield (98 %) at room temperature for the reaction time of 5 h. The structure of the obtained macromonomers (PEGDM) is confirmed by FTIR, 1H NMR and 13C NMR, where the methacrylate end groups are clearly visible. Thermogravimetric analysis (TGA) is used to study the thermal stability of these obtained macromonomers. The presence of unsaturated end group was confirmed by UV-Visible analysis.
Mechanical and Tribological Properties of Polymers and Polymer-Based Composites
Authors:   Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science and Engineering and Department of Physics, University of North Texas, 3940 North Elm Street, Denton, TX 76207, USA, Brostow Witold , Fałtynowicz Hanna ,   Faculty of Chemistry, Wrocław University of Science and Technology, 7/9 Gdańska St., 50-344 Wrocław, Poland, Gencel Osman ,   Department of Civil Engineering, College of Engineering, Bartin University, 74100 Bartin, Turkey, Grigoriev Andrei ,   V.A. Belyі Institute of Mechanics of Polymer-Metal Systems of the Academy of Sciences of Belarus, 32A, Kirova St., 246050 Homel, Belarus, Hagg Lobland Haley E. ,   Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science and Engineering and Department of Physics, University of North Texas, 3940 North Elm Street, Denton, TX 76207, USA, Zhang Danny ,   Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science and Engineering and Department of Physics, University of North Texas, 3940 North Elm Street, Denton, TX 76207, USA
Published: December 2020

A definition of rigidity of polymers and polymer-based composites (PBCs) by an equation is formulated. We also discuss tribological properties of polymers and PBCs including frictions (static, sliding and rolling) and wear. We discuss connections between viscoelastic recovery in scratch resistance testing with brittleness B, as well as Charpy and Izod impact strengths relations with B. Flexibility Y is related to a dynamic friction. A thermophysical property, namely linear thermal expansivity, is also related to the brittleness B. A discussion of equipment needed to measure a variety of properties is included.
Chemical Composition of the Essential Oils from the Leaf, Stem-Bark and Twig of Terminalia mantaly H. Perrier (Combretaceae) from Nigeria
Authors: Owoade Olajumoke Mariam , Oke David Gbenga
Published: December 2020

The essential oils from the leaf, stem-bark and twig of Terminalia mantaly were isolated by hydrodistillation. The volatile oils analysed on Gas Chromatography (GC) and Gas Chromatography – Mass Spectrometer (GC - MS). The identified constituents were twelve, twenty-three and seventeen for the leaf, stem-bark and twig and accounted for 89.57%, 95.77%, 95.92% respectively. Hexahydrofarnesylacetone (30.05%) and Z-pinane (16.71%) were the main constituents in the leaf oil and nonanal (21.16%) and heptanal (10.57%) were principal component in the stem-bark volatile oil. Xylene isomers namely, meta and para (21.98%-23.56%) were the major components of the twig with substantial amount of nonanal (13.64%).
Molecular Docking of Compounds in the Essential Oil of Ocimum gratissimum Leaf against PIM-1 Kinase of Escherichia coli
Authors: Duru Ijeoma Akunna , Duru Chidi Edbert
Published: December 2020

The activity of the phytochemical compounds in the essential oil of Ocimum gratissimum against PIM-1 kinase of Escherichia coli was studied using computer simulation. The essential oil was extracted by hydrodistillation, and the components identified using a gas chromatography-flame ionization detector (GC-FID) instrument. The quantity of the compounds in the essential oil was in the order isobornyl acetate (64.3 %) > Octamethylhexadecan-1-ol (12.2 %) > nonadecanal (11.5 %) > decanal (8.7 %) > undecanal (2.8 %) > α-selinene (0.5 %) > drimenin (< 0.1 %). The results from the in silico studies showed that α-selinene had good binding affinity on the PIM-1 kinase target and therefore, could be a promising drug candidate for prostate cancer.
Functional Properties of Tigernut and Cowpea Flour Blends
Authors: Obinna-Echem Patience C. , Wachukwu-Chikaodi Happiness I. , Dickson Okwagwung A.
Published: December 2020

The pH and functional properties: water and oil absorption capacity, bulk density, solubility, swelling power and foaming capacity of tigernut and cowpea flour blends were determined. The flour blends were coded with the letters B, C, D, E, F, G and H for cowpea flour substitutions of 5, 10, 15, 20, 30, 40 and 50 % respectively. For comparison sample A1, A2 and A3 representing 100 % of wheat, tigernut and cowpea respectively, were also evaluated. Standard methods were used for all the analysis. pH of the flour samples varied significantly (P ≤ 0.05) from 5.60-6.23 for sample B (5 % cowpea flour substitution) and A2 (100% tiger nut flour) respectively. Water and oil absorption capacity varied significantly (P ≤ 0.05) from 1.00-2.90 ml/g and 0.39-1.38 ml/g respectively. Sample A1 (100% wheat flour) and Sample B (5% Cowpea: 95% tigernut flour) was significantly (P ≤ 0.05) the highest in water absorption capacity while sample A1 (% wheat flour) had the highest oil absorption capacity. Bulk density varied from 0.58 - 0.84 g/cm3. Although Cowpea flour (sample A3) had the highest bulk density, there was significant (P ≤ 0.05) decrease with increase in cowpea substitution. Swelling power and solubility ranged from 0.08-6.74 g/g and 8.00–67.35 % respectively. Sample A1 (% wheat flour) had significantly (P ≤ 0.05) the highest solubility and swelling power while Sample A3 (% cowpea flour) had the least. The functional properties of the tigernut-cowpea composite flour were comparable with that of the wheat flour, except for the swelling power that was significantly (P ≤ 0.05) higher for the wheat flour. The result showed that the composite tigernut-cowpea flour can be good alternative in the production of bakery products that would not require much swelling.
Silence and Inactivity. Speculating about the Political Fate of Alexander Solzhenitsyn
Authors: Mezhuev Boris V.
Published: December 2020

In the article the author tries to analyze the fate of Alexander Solzhenitsyn as active political figure. The writer viewed himself as the person whose mission was not only to reveal to the Russian readers the truth about Bolshevism, its origin and tragic consequences but also to show Russia the way a better future. However, in 1983, on the eve of «perestroika», Solzhenitsyn resigned from any political comments and for seven year went into seclusion. The author of the article examines Solzhenitsyn’s social and political publications with the aim to figure out the reasons for his self-isolation that prevented him from influencing strongly the political processes in Russia.