scholarly journals Effect of the position of parallelogram ribs in micro channel on heat transfer using diamond nanoparticles

10.30544/537 ◽  
2020 ◽  
Author(s):  
Kamel Chadi ◽  
Nourredine Belghar ◽  
Mokhtar Falek ◽  
Zied Driss ◽  
Belhi Guerira
Keyword(s):  
Reynolds Number ◽  
Heat Dissipation ◽  
Constant Heat Flux ◽  
The Other ◽  
Three Dimensions ◽  
Micro Channel ◽  
Electronic Components ◽  
Thermal Exchange ◽  
First Case ◽  
The Impact

In the present work, we have studied numerically three dimensions, the impact of the position of parallelogram ribs in a micro-channel on thermal exchange. In this study, we proposed three cases of micro-channel heat sinks with parallelogram ribs. As well as one case without ribs, in each of the three cases, we varied the parallelogram rib positions on the micro-channel. The main purpose of this study is to find the best position for parallelograms ribs in which the heat dissipation is useful for improving the thermal performance of the micro-channel as well as improving the cooling of electronic components. We have chosen silicon micro-channel drains for four cases. Constant heat flux is applied to the bottom surfaces and using a nanofluid diamond-water with 5% volume concentration of diamond nanoparticle as a coolant. The simulation has been carried out using the commercial software ANSYS-Fluent. Reynolds number (Re) has been taken between 200 and 400 with the corresponding inlet velocity from 1.53 m/s to 3.01 m/s, and the flow regime has been assumed to be stationary. The numerical results show that the parallelogram ribs position of the micro-channel in the second case gave an improvement in heat exchange, where the Nusselt number is higher than in the other cases, and showed a reduction in the temperature of the heated bottom wall compared to the other cases. Also, the micro-channel shape in the second case can be used to cool the electronic components. The results also showed that with increasing Reynolds number (Re), the friction factor of the micro-channel decreases in all cases. At the same time, we find the lowest value of the thermal resistance in the second case and the biggest value in the first case, base micro-channel without ribs.

scholarly journals Effect of the addition of pie-shaped ribs and parallelogram ribs in micro-channels on thermal performance using diamond-water nanofluid

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Kamel Chadi ◽  
Nourredine Belghar ◽  
Belhi Guerira ◽  
Mohammed Lachi ◽  
Mourad Chikhi
Keyword(s):  
Heat Dissipation ◽  
Constant Heat Flux ◽  
Three Dimensions ◽  
Bottom Wall ◽  
Micro Channel ◽  
Thermal Exchange ◽  
Fourth Case ◽  
Exchange Performance ◽  
Micro Channels ◽  
Lower Temperature

AbstractIn this paper, we numerically study the influence of the addition of parallelogram ribs and pie-shaped ribs in micro-channels on thermal exchange in three dimensions. We design four different silicon micro-channel heat sinks; the first and second cases without ribs, the third case with added pie-shaped ribs, and a fourth case containing parallelogram ribs. The main purpose of this research is to determine the best micro-channel heat sink in which the heat dissipation is sufficient to improve the heat exchange performance of the micro-channel, as well as to improve the cooling of the electronic components. A constant heat flux is applied to the bottom wall of the four micro-channels, and we use liquid diamond-water with a volume concentration of 5% diamond nanoparticles as a coolant, with a Reynolds number chosen between 200 and 600. The numerical results show that the Nusselt number (Nu) of the micro-channel that contains the parallelogram ribs is higher than that for the other cases, and it also yiels lower temperature values on the bottom wall of the substrate compared to the micro-channel containing pie ribs. When increasing the flow velocity, the thermal resistance of the micro-channel decreases in all cases, and we then find the largest value of the friction factor in the fourth case (with parallelogram ribs).

scholarly journals Antecedents of organizational commitment of insurance agents: Job satisfaction, ethical behavior, and ethical climate

2020 ◽  
Vol 5 (2) ◽  
pp. 134-149
Author(s):  
Weihui Fu ◽  
Feng He ◽  
Na Zhang
Keyword(s):  
Job Satisfaction ◽  
Organizational Commitment ◽  
Ethical Behavior ◽  
Ethical Climate ◽  
Positive Impact ◽  
The Other ◽  
Three Dimensions ◽  
Insurance Agents ◽  
Ethical Climates ◽  
The Impact

This research explored the impact of job satisfaction, the ethical behavior of coworkers, successful managers, and employees themselves. Also explored were six types of ethical climate on organizational commitment and its three dimensions, including affective, continuance, and normative commitment through an investigation on 476 Chinese insurance agents. The empirical results showed that ethical behavior of coworkers and a caring climate had a significantly positive impact on both organizational commitment and its three dimensions, while independence climate had no significant influence on overall organizational commitment or its three dimensions. Job satisfaction, ethical behavior of successful managers and employees themselves, and the other five types of ethical climates only had a significant impact on organizational commitment or some of its dimensions.

scholarly journals Flow "reflexion" and " refraction" on perforated wall

2019 ◽  
Vol 213 ◽  
pp. 02085
Author(s):  
Vaclav Tesař
Keyword(s):  
Reynolds Number ◽  
Fluid Flow ◽  
Cross Section ◽  
Oblique Impact ◽  
The Other ◽  
Perforated Wall ◽  
Spatially Periodic ◽  
Oval Cross Section ◽  
The Impact

This article presents some results accumulated by author during investigation of an oblique impact of fluid flow on a wall consisting of a spatially periodic rods of very simple oval cross section. The flowfield in the vicinity of the impact is quite complex and strongly Reynolds -number dependent. A part of the jet downstream from the impact is “reflected” from the wall — while the rest, which passes through the empty spaces between the cascade members, leaves the other wall side in what appears to be “refraction” direction.

Who Supports the Sunflower Movement? An Examination of Nationalist Sentiments

2016 ◽  
Vol 52 (8) ◽  
pp. 1193-1212 ◽  
Author(s):  
Fang-Yu Chen ◽  
Wei-Ting Yen
Keyword(s):  
Social Impact ◽  
The Other ◽  
Three Dimensions ◽  
Legislative Yuan ◽  
The Social ◽  
Economic Exchanges ◽  
History Of ◽  
National Attachment ◽  
Original Survey ◽  
The Impact

The Sunflower Movement—an occupation of the Legislative Yuan (the Congress) for 24 days—was an unprecedented moment in the history of Taiwan. We examine the social foundation of the Movement and explore an important factor that has long been missing in the literature of Taiwanese politics: nationalism. We divide nationalism into three dimensions: national attachment, national chauvinism, and feelings toward other countries. Using original survey data collected six months after the Movement, we find that national attachment (being proud of Taiwan) and anti-China feelings are unique dimensions and both lead to a higher level of support for the Sunflower Movement. National chauvinism, on the other hand, is not associated with supports for the Movement. Furthermore, the impact of nationalism is contingent on sociotropic views. People who express higher levels of nationalism are more responsive to the issue of rising income inequality when evaluating the Movement. The underlying logic is when people are more nationalistic they care more about the potential social impact of expanding socio-economic exchanges with another country. These results point to it being necessary to disentangle various components of nationalism and further investigate their effects on individuals’ political behaviors.

scholarly journals Videojuegos y su Impacto en la Salud Mental: Estudio Experimental Sobre Exposición a Videojuegos Violentos en Estudiantes Universitarios

2019 ◽  
Vol 7 (1) ◽  
pp. 24-30
Author(s):  
Rolando Manuel Reyes Padilla ◽  
Felipe Del Ángel Padrón Morales ◽  
Juan Eduardo Soto Luévano ◽  
Carlos Argelio Arévalo Mercado
Keyword(s):  
Video Games ◽  
Negative Impact ◽  
The Other ◽  
First Case ◽  
Salud Mental ◽  
The Subject ◽  
Calming Effect ◽  
The Impact ◽  
Estudiantes Universitarios ◽  
Catalyst Model

Los videojuegos representan uno de los mayores fenómenos contemporáneos. Se reporta que hasta un 85% de ellos incluye alguna forma de violencia, generando una preocupación sobre el impacto negativo que pudiera llegar a tener. Esto ha dado lugar a gran número de investigaciones sobre su posible impacto, sin observarse un consenso sobre el tema. La presente investigación tuvo como objetivo medir el impacto de la exposición a videojuegos violentos como uno de los factores que pueden aumentar la agresividad de las personas, mencionado por el “Catalyst Model”. Mediante la realización de un experimento controlado, los resultados sugieren que los videojuegos no fueron un factor de aumento de la agresividad. Se detectaron dos casos anómalos. En el primero, el videojuego no violento tuvo un efecto calmante a actitudes hostiles y en el otro el videojuego violento, fungió como un incrementador de actitudes agresivas. Video games represent one of the greatest contemporary phenomena. It is reported that up to 85% of them include some form of violence, generating a concern about the negative impact that could have. This has led to a large number of research on its possible impact, without observing a consensus on the subject. The objective of this research was to measure the impact of exposure to violent video games as one of the factors that can increase the aggression of people, mentioned by the "Catalyst Model". By conducting a controlled experiment, the results suggest that video games were not a factor in increasing aggressiveness. Two anomalous cases were detected. On the first case, nonviolent videogames worked as a calming effect to hostile attitudes. On the other, they worked in a contrary way with violent videogames, acting as a catalyst of the participant's aggressive attitudes.

scholarly journals Droplet impact on a thin liquid film: anatomy of the splash

2016 ◽  
Vol 802 ◽  
pp. 775-805 ◽  
Author(s):  
Christophe Josserand ◽  
Pascal Ray ◽  
Stéphane Zaleski
Keyword(s):  
Reynolds Number ◽  
Liquid Film ◽  
Numerical Simulations ◽  
Thin Liquid Film ◽  
Droplet Impact ◽  
The Other ◽  
Dimensionless Number ◽  
Scaling Analysis ◽  
The Impact ◽  
Short Times

We investigate the dynamics of drop impact on a thin liquid film at short times in order to identify the mechanisms of splash formation. Using numerical simulations and scaling analysis, we show that it depends both on the inertial dynamics of the liquid and the cushioning of the gas. Two asymptotic regimes are identified, characterized by a new dimensionless number $J$: when the gas cushioning is weak, the jet is formed after a sequence of bubbles are entrapped and the jet speed is mostly selected by the Reynolds number of the impact. On the other hand, when the air cushioning is important, the lubrication of the gas beneath the drop and the liquid film controls the dynamics, leading to a single bubble entrapment and a weaker jet velocity.

Modernism, Empiricism, and Rationalism

2016 ◽  
Vol 46 (1) ◽  
pp. 38-47
Author(s):  
Geoffrey Squires
Keyword(s):  
Twentieth Century ◽  
The Other ◽  
Modern Poetry ◽  
Philosophical Perspective ◽  
Irish Poetry ◽  
Dimensional Spectrum ◽  
Culture History ◽  
The World ◽  
The Impact ◽  
Rule Out

Modernism is usually defined historically as the composite movement at the beginning of the twentieth century which led to a radical break with what had gone before in literature and the other arts. Given the problems of the continuing use of the concept to cover subsequent writing, this essay proposes an alternative, philosophical perspective which explores the impact of rationalism (what we bring to the world) on the prevailing empiricism (what we take from the world) of modern poetry, which leads to a concern with consciousness rather than experience. This in turn involves a re-conceptualisation of the lyric or narrative I, of language itself as a phenomenon, and of other poetic themes such as nature, culture, history, and art. Against the background of the dominant empiricism of modern Irish poetry as presented in Crotty's anthology, the essay explores these ideas in terms of a small number of poets who may be considered modernist in various ways. This does not rule out modernist elements in some other poets and the initial distinction between a poetics of experience and one of consciousness is better seen as a multi-dimensional spectrum that requires further, more detailed analysis than is possible here.

HOME VISITS DURING THE FIRST MONTH OF DELIVERY FOR RECENTLY DELIVERED WOMEN IN UTTAR PRADESH, INDIA

2020 ◽  
Vol 6 (5) ◽  
pp. 1183-1189
Author(s):  
Dr. Tridibesh Tripathy ◽  
Dr. Umakant Prusty ◽  
Dr. Chintamani Nayak ◽  
Dr. Rakesh Dwivedi ◽  
Dr. Mohini Gautam
Keyword(s):  
Large Scale ◽  
National Level ◽  
Uttar Pradesh ◽  
Life Time ◽  
Structured Interview ◽  
The Other ◽  
Registration System ◽  
Action Group ◽  
Current Article ◽  
The Impact

The current article of Uttar Pradesh (UP) is about the ASHAs who are the daughters-in-law of a family that resides in the same community that they serve as the grassroots health worker since 2005 when the NRHM was introduced in the Empowered Action Group (EAG) states. UP is one such Empowered Action Group (EAG) state. The current study explores the actual responses of Recently Delivered Women (RDW) on their visits during the first month of their recent delivery. From the catchment area of each of the 250 ASHAs, two RDWs were selected who had a child in the age group of 3 to 6 months during the survey. The response profiles of the RDWs on the post- delivery first month visits are dwelled upon to evolve a picture representing the entire state of UP. The relevance of the study assumes significance as detailed data on the modalities of postnatal visits are available but not exclusively for the first month period of their recent delivery. The details of the post-delivery first month period related visits are not available even in large scale surveys like National Family Health Survey 4 done in 2015-16. The current study gives an insight in to these visits with a five-point approach i.e. type of personnel doing the visit, frequency of the visits, visits done in a particular week from among those four weeks separately for the three visits separately. The current study is basically regarding the summary of this Penta approach for the post- delivery one-month period.     The first month period after each delivery deals with 70% of the time of the postnatal period & the entire neonatal period. Therefore, it does impact the Maternal Mortality Rate & Ratio (MMR) & the Neonatal Mortality Rates (NMR) in India and especially in UP through the unsafe Maternal & Neonatal practices in the first month period after delivery. The current MM Rate of UP is 20.1 & MM Ratio is 216 whereas the MM ratio is 122 in India (SRS, 2019). The Sample Registration System (SRS) report also mentions that the Life Time Risk (LTR) of a woman in pregnancy is 0.7% which is the highest in the nation (SRS, 2019). This means it is very risky to give birth in UP in comparison to other regions in the country (SRS, 2019). This risk is at the peak in the first month period after each delivery. Similarly, the current NMR in India is 23 per 1000 livebirths (UNIGME,2018). As NMR data is not available separately for states, the national level data also hold good for the states and that’s how for the state of UP as well. These mortalities are the impact indicators and such indicators can be reduced through long drawn processes that includes effective and timely visits to RDWs especially in the first month period after delivery. This would help in making their post-natal & neonatal stage safe. This is the area of post-delivery first month visit profile detailing that the current article helps in popping out in relation to the recent delivery of the respondents.   A total of four districts of Uttar Pradesh were selected purposively for the study and the data collection was conducted in the villages of the respective districts with the help of a pre-tested structured interview schedule with both close-ended and open-ended questions.  The current article deals with five close ended questions with options, two for the type of personnel & frequency while the other three are for each of the three visits in the first month after the recent delivery of respondents. In addition, in-depth interviews were also conducted amongst the RDWs and a total 500 respondents had participated in the study.   Among the districts related to this article, the results showed that ASHA was the type of personnel who did the majority of visits in all the four districts. On the other hand, 25-40% of RDWs in all the 4 districts replied that they did not receive any visit within the first month of their recent delivery. Regarding frequency, most of the RDWs in all the 4 districts received 1-2 times visits by ASHAs.   Regarding the first visit, it was found that the ASHAs of Barabanki and Gonda visited less percentage of RDWs in the first week after delivery. Similarly, the second visit revealed that about 1.2% RDWs in Banda district could not recall about the visit. Further on the second visit, the RDWs responded that most of them in 3 districts except Gonda district did receive the second postnatal visit in 7-15 days after their recent delivery. Less than half of RDWs in Barabanki district & just more than half of RDWs in Gonda district received the third visit in 15-21 days period after delivery. For the same period, the majority of RDWs in the rest two districts responded that they had been entertained through a home visit.

Wacana Kolonial dalam Novel Max Havelaar: Sebuah Kajian Poskolonial

Metahumaniora ◽  
2017 ◽  
Vol 7 (3) ◽  
pp. 411
Author(s):  
Abu Bakar Ramadhan Muhamad
Keyword(s):  
Point Of View ◽  
The Other ◽  
The Novel ◽  
Colonial Discourse ◽  
The Impact ◽  
The Voice

AbstrakHegemoni kolonialisme dalam budaya poskolonial merupakan alasan penelitian inikemudian mengkaji wacana kolonial dalam novel Max Havellar (MH) khususnya dampakditimbulkannya. Dampak dimaksud adalah posisi keberpihakan pemikiran tersirat darikarya tersebut. Hasil pembahasan menunjukkan, secara temporal maupun permanen MHmenyuarakan ketidakadilan dalam kondisi-kondisi kolonial menyangkut penindasan sangpenjajah terhadap terjajah. Hanya saja, upaya mengatasnamakan atau mewakili suarakaum terjajah terbukti mengimplikasikan ciri ideologis statis kerangka kolonialisme(orientalisme); yakni cara pandang Eropasentris, di mana “Barat” sebagai self adalah superior,dan “Timur” sebagai other adalah inferior. Dalam konteks poskolonialisme, MH dengan sifatkritisnya yang berupaya “menyuarakan” nasib pribumi terjajah, justru menampilkan stigmapenguatan kolonialitas itu sendiri secara hegemonik. Artinya, “menyuarakan” nasib pribumidimaknai sebagai keberpihankan kolonial yang kontradiktif, di mana stigma penguatankolonialitas justru lebih terasa, ujung-ujungnya melanggengkan hegemoni kolonial. Tidakmembela yang terjajah, tetapi memperhalus cara kerja mesin kolonial.AbstractThe hegemony of colonialism in the culture of postcolonial society is the reason this studythen examines the colonial discourse in the novel Max Havellar (MH) in particular the impactit brings. The impact in question is the implied position of thought in the work. The resultsof the discussion show that, temporarily or permanently, MH voiced injustice in the colonialconditions regarding the oppression of the colonist against the colonized. However, the effort toname or represent the voice of the colonized has proven to imply a static ideological characterin the framework of colonialism (orientalism); ie Eropacentric point of view, in which “West” asself is superior, and “East” as the other is the inferior. In the context of postcolonialism, MH withits critical nature that seeks to “voice” the fate of the colonized natives, actually presents thestigma of strengthening coloniality itself hegemonicly. That is, “voicing” the fate of the pribumiis interpreted as a contradictory colonial flare, where the stigma of strengthening colonialityis more pronounced, which ultimately perpetuates the hegemony of colonialism. No longerdefending the colonized, but refining the workings of the colonial machinery.

Gifted Students' Motivation and its Impact on the Development of their Giftedness

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Hussein SALEM MUBARAK BARABWD ◽  
Mohammad YUSOFF BIN MOHD NOR ◽  
Noriah Mohd Ishak
Keyword(s):  
Extrinsic Motivation ◽  
Gifted Students ◽  
Qualitative Approach ◽  
The Other ◽  
Phenomenological Method ◽  
Self Confidence ◽  
Verbal Praise ◽  
Intrinsic Motivations ◽  
The Impact ◽  
Intrinsic And Extrinsic Motivations

The aim of the current study is to examine the intrinsic and extrinsic motivations of the gifted students from Hadhramout Gifted Center HGC in Yemen, and to investigate the impact of these intrinsic and extrinsic motivations on their giftedness development. A qualitative approach was adopted; data has been collected through an open- ended questionnaire that was prepared by the researcher and distributed among a sample of gifted students who were chosen purposively from HGC. The interpretative phenomenological method has been used to analyze the data using, Atlas ti. The results indicate that the majority of the participants consider it interesting to explore new things, and experience curiosity and desire to achieve their goals as their intrinsic motivations. Whereas, the minority consider preference to serve the community, competition preference and self-confidence as their intrinsic motivations. On the other hand, half of the participants consider rewards as their extrinsic motivation, whereas 40 % of them consider exams scores, verbal praise, parents and environment as their extrinsic motivations. Regarding the impact of intrinsic and extrinsic motivations on the development of giftedness, the majority of the participants believe that intrinsic and extrinsic motivations affect positively the development of their giftedness development. Finally, based on the findings, some recommendations were provided. 

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