Study of Flow and Heat Transfer for the Supercritical Hydrogen in Spallation-Type Cylindrical Neutron Moderator

Pipe height in cylindrical neutron moderator is an important factor to flow pattern, temperature distribution and even the neutron characters. In this paper, the steady-state thermal analysis of cold neutron moderator is carrying out with different heights, conjugated heat transfer method and one-way coupled with a neutron transfer software. The different pipe heights, which is the jet-to-surface distances (H/D = 0.5~6), were compared using a 2D moderator model. The results show that vortex size and velocity gradient from container wall to vortex center vary with H/D, the center of recirculation zone nearly remain constant, and heat transfer effect is weakened on the target bottom surface. With H/D increasing, the velocity at bottom target surface is progressively decreased, and cooling effect is poor, leading to the rise in temperature. The optimal range cooling performance is (H/D) = 0.5~1 at Re = 1.7 × 105, and the enhancement of beam power further strengthens the thermal deposition difference between container and liquid hydrogen. The results can be applied to moderator component design and optimization in the future spallation neutron source.

ENTREPRENEURSHIP AND ECONOMIC GROWTH NEXUS IN NIGERIA: MODERATING EFFECT OF INSTITUTIONAL QUALITY: ARDL COINTEGRATION APPROACH

This paper explores the relationship between entrepreneurship and economic growth in Nigeria: the moderating role of institutional quality. To accomplish this, the study employs an Autoregressive distributed lag (ARDL) from (2002Q1–2019Q4) and uses a moderator model to examine the impact of entrepreneurship on economic growth via institutional quality. The resilts show that institutional quality in Nigeria has a positive impact on economic growth. The results also indicate that the interactive effect of institutional quality and entrepreneurship has positive effect on economic growth in Nigeria both in the short-run and long-run. The study illustrate that the productive entrepreneurship is a potent vehicle for promoting long term economic growth in Nigeria. In general, unless institutional quality is introduced to improve the influence of entrepreneurship on economic growth, entrepreneurial activity alone may not lead to desired growth. Furthermore, the study presents a perspective of the role of government in establishing an enabling environment that promotes entrepreneurial activity and, as a result, enhances economic growth in Nigeria. Based on this finding, the study recommends for the implimantation of measures and policies aims at encourageing productive entrepreneurial activities that contribute to economic growth. In addition Government and policymakers should improved the quality of institutions such as improving Government Effectiveness, Political Stability and Absence of Violence, Voice and Accountability, Regulatory Quality, Rule of Law and Control of Corruption. KEYWORDS: Economic growth, Entrepreneurship, Moderating, Institutional quality.

Job Insecurity and Depressive Symptoms in Mothers and Adolescents: A Dyadic Study

In this study, we examined whether maternal perceived job insecurity (JI) affected depressive symptoms in their adolescent children. Specifically, we tested a mediator-moderator model in which we hypothesized that maternal JI was related to adolescent depressive symptoms indirectly via maternal depressive symptoms. Most importantly, we also explored whether this indirect path was moderated by two buffering resources, i.e., maternal off-job recovery and adolescent self-esteem. There is little research on the effects of parental JI on adolescent children from the viewpoint of buffering moderators. Due to growing insecurity in the labor markets we need more information about resources that mitigate the harmful effects of JI within families. We tested the model via structural equation modeling among Finnish mother-adolescent dyads (N = 601, mothers aged 32–60 years; adolescents aged 14–18 years). Our results showed that mothers’ depressive symptoms did not mediate the relationship between mothers’ JI and adolescents’ depressive symptoms, but mothers’ JI was directly related to increased depressive symptoms among both adolescents and their mothers. Mothers’ off-job recovery and adolescents’ self-esteem buffered against mothers’ JI in relation to depressive symptoms. When off-job recovery (in mothers) and self-esteem (in adolescents) were high, the higher level of JI was not associated with increased depressive symptoms. Off-job recovery among working mothers should be improved as it has potential to protect against JI. Moreover, adolescents’ self-esteem should be boosted as it mitigates the effects of mothers’ job stress (e.g., JI) on adolescents’ well-being.

From the Classroom into Virtual Learning Environments: Essential Knowledge, Competences, Skills and Pedagogical Strategies for the 21st Century Teacher Education in Kenya

As teachers in Kenya begin to migrate from the classroom to virtual learning spaces following COVID 19 pandemic, there is pressing need to realign Teacher Education to requisite Knowledge, competences, skills, and attitudes that will support online teaching. This chapter explores these needs using a combination of lived experiences and literature review that captured a meta-analysis of research trends on e-learning. While trends in Teacher Education indicate progression towards adoption of technology, there are disparities between the theory and practice. Evidence from recent research and reports; and the recollected experiences confirmed knowledge, competence, skills and pedagogical gaps in the implementation of online learning, that have been exacerbated by COVID-19. The researcher recommends that teacher education should sensitize and train teacher trainees on how to access, analyze and use new knowledge emerging with technology; they also should be coached on how learners learn with technology and on fundamentals of the communication process. Particularly the course on educational technology, should focus on how to create and manage online courses. The 5-stage E-Moderator Model and Universal Design for Learning (UDL) are recommended as effective pedagogical scaffold for online teaching.

Peran frustrasi pada pola asuh otoriter dan agresi: Model moderasi

Penelitian ini bertujuan untuk mengetahui peran pola asuh otoriter dalam meningkatkan kecenderungan perilaku agresi yang dimoderatori oleh frustrasi pada remaja. Responden penelitian ini berjumlah 150 responden. Instrumen yang digunakan adalah Parental Authory Questionnaire Scale (PAQ) yang disusun oleh Buri (1991), Skala frustrasi dan Aggression Questionnaire Buss-Perry Scale (Buss & Perry, 1992). Teknik analisis statistik yang digunakan dalam penelitian ini adalah analisis efek moderator model 1 PROCESS (Hayes, 2013). Hasil penelitian ini menunjukkan bahwa frustrasi secara signifikan memengaruhi besar kecilnya peranan pola asuh otoriter terhadap munculnya kecenderungan perilaku agresi. Remaja yang mengalami frustrasi yang tinggi (affect = 1.0043; p <.001) dan sedang (affect = 0.6274; p <.001) secara signifikan dapat meningkatkan peran pola asuh otoriter orang tua terhadap munculnya kecenderungan perilaku agresif. Namun, remaja yang mengalami frustrasi yang rendah tidak signifikan mendorong muncul perilaku agresi walaupau mereka mengalami gaya pengasuhan yang otoriter dari orang tua. Hal ini menunjukkan bahwa tingkat frustrasi pada remaja memegang peranan penting dalam terbentuknya kecenderungan perilaku agresi pada remaja yang mengalami gaya pengasuhan yang otoriter dari orang tua mereka.

Military intervention in brazil: pinnacle, disruption and decline

Brazil until the establishment of the Civil and Military Regime of March 31, 1964 coexisted with military coups, which ravaged the entire republican period and contributed to corrupt any democratic pretension of the nation. This article aims to examine the process that would have sought to withdraw the armed segment from political activity after that date, by means of an analysis of the course of political and strategic actions that led to a rupture with the previous paradigm and changes in civil and military relations and in the Brazilian democracy. In the theoretical and methodological framework, the argumentation, based on a hypothetical deductive approach, was supported by a dialectical path assumption, taking as a starting point the Moderator Model of Alfred Stepan, to which put an opposing configuration structure, so called Enframement Antimodel, which supposedly would result in a form of very close relationship with that proposed by Samuel Phillips Huntington, named Civilian Objective Control. As a result, the study concludes by confirming the hypothesis of the work and, also, that the interference of the military rulers, besides restoring the lines of obedience, had provided the possibility of a change in the direction of the Brazilian democracy, in the sense its political development would be free from armed guardianship.

Does competitiveness moderate inclusive growth: a panel study of low-income countries

Purpose In the past few years, the concept of competitiveness developed by the World Economic Forum has become the focal point. Global competitiveness index (GCI) presents the constructs which are possible means of productivity of the country. The purpose of this study is to explore whether boosting the productivity of agriculture, services and industry sector is the possible channel of competitiveness leading to growth. Design/methodology/approach For this, panel GMM moderator model has been used for 16 low-income countries. Findings The results indicate that competitiveness helps agriculture and industry sector to become more growth productive, while it reduces the productivity of services sector. Originality/value This study urges that the gains from following the competition promotion policies overweigh the costs. Hence, low-income countries can break the low productivity trap.