8 research outputs found
Numerical investigation of heat transfer enhancement in plate-fin heat sinks: effect of flow direction and fillet profile
No full textMany researchers have studied the thermal performance of heat sinks, however to the best knowledge of the authors, the effect of flow direction (place of fan) on the thermal performance of plate-fin heat sinks with fillet profile have not yet been investigated. In this paper, the investigation develops a computational fluid dynamics (CFD) model, validated through comparison with an experimental data from the literature, which demonstrates the effect of flow direction and fillet profile on the thermal performance of plate-fin heat sinks. In particular, a plate-fin heat sink with fillet profile subject to parallel flow has been compared with the conventional design (plate-fin heat sink without fillet profile subject to an impinging flow) and satisfactory results have been perceived. The results of this study show that the base temperature along with the thermal resistance of the heat sink is lower for the proposed design. Therefore, the developed approach has strong potential to be used to improve the thermal performance of heat sinks and hence to develop more advanced effective cooling technologies
Experimental Study to Enhance the Performance of Heat Transfer in Fire Tube Boilers
No full textThis paper deals with experimental study which is a fixed the corrugated strip plate inside fire box tube (furnace duct), in order to enhanced the performance of heat transfer between the hot gases inside tubes and water outside the tube.As well as to prevent furnace walls by making the combustion hot gases is homogenous hot gases inside the furnace which is cases the high thermal stress. Upon the furnace wall. The results of experimental work gives good indications, this agreement enhance the heat transfer gives long life time and reduce the madding cost of the boiler
THE SOCIAL MEDIA ROLE IN FORMING POLITICAL AWARENESS AMONG IRAQI YOUTH
No full textThis thesis uses the uses and gratifications theory (U&G) to understand the relationship between social media use and political knowledge and participation among Iraqi youth during the October revolution in 2019. This study investigates the role of social media platforms (Facebook, Twitter) in forming political awareness and the relationship between social media use and political knowledge and participation among Iraqi youth. The study focused on the importance of youth participation in discussing political issues and how social media helped Iraqi youth to build political knowledge and address matters of concern. Additionally, there is a lack of research conducted that focuses on the role social media in influencing Iraqi youth and forming their political knowledge, as an Iraqi Arab. The author aims to fill research gaps by making observations and recommendations that could help future activists.
Based on a review of existing studies, very few researchers have studied Iraqi youth and their use of social media in general and the relationship between social media and political knowledge in particular. The uprising in Iraq and the crackdown of the government on the protest showed how Iraq, a country that was presented after 2003 to the international community as a “democratic” state, is dominated by an authoritarian regime. Protesters demanded government policies change and policy reforms, but soon people across the region the demands shifted to regime change and asked for new leadership and the resignation of their current governments. This thesis will focus its investigation on two social networking platforms, Facebook and Twitter, and their role in the Iraqi protests; these platforms are used in Iraq for political discourse and during the revolution.Communication, Jack J. Valenti School o
Numerical investigation of heat transfer enhancement in plate-fin heat sinks: Effect of flow direction and fillet profile
No full textMany researchers have studied the thermal performance of heat sinks, however to the best knowledge of the authors, the effect of flow direction (place of fan) on the thermal performance of plate-fin heat sinks with fillet profile have not yet been investigated. In this paper, the investigation develops a computational fluid dynamics (CFD) model, validated through comparison with an experimental data from the literature, which demonstrates the effect of flow direction and fillet profile on the thermal performance of plate-fin heat sinks. In particular, a plate-fin heat sink with fillet profile subject to parallel flow has been compared with the conventional design (plate-fin heat sink without fillet profile subject to an impinging flow) and satisfactory results have been perceived. The results of this study show that the base temperature along with the thermal resistance of the heat sink is lower for the proposed design. Therefore, the developed approach has strong potential to be used to improve the thermal performance of heat sinks and hence to develop more advanced effective cooling technologies. Keywords: Computational fluid dynamic (CFD), Heat sink, Fin, Thermal performanc
Detoxification of Olive Mill Wastewater Using the White Rot Fungus Phanerochaete chrysosporium
No full textHEAT TRANSFER INSIDE BUILDING- CLADDING SOLAR COLLECTOR
No full textIn this work numerical and experimental investigation have been adopted to collect and store solar energy in exterior-wall cladding, Various improvements have been investigated inside and outside the duct to increase the efficiency of thermal heating. ANSYS software has been used to simulate current case. Results show that there is a good agreement between experimental and numerical results and this agreement increases as air velocity increases. The average percentage error for air inside duct at velocity of air 1 m/s, 3 m/s and 5 m/s is 8%, 16.5% and 5% respectively. Several vertical cooper cylinders with 12 mm diameter were added inside basin to increase the surface area. It has been found that the enhancement in temperature of air between this case and Smooth Duct, Smooth Cover base model for air velocity of 1,3and 5 m/s is 3, 4 and 11 % respectively. The effect of increasing surface area by using granular (corrugated) duct on the air temperature distribution along the duct. Have been also investigated the percentage enhancement in temperature of air between this case and previous base smooth duct case for velocities of 1, 3 and 5 m/s is 19.4, 28.6 and 16.5 % respectively. The enhancement in heat transfer when using both granular hollow sphere duct with vertical metal cylinders for air velocity of 1, 3 and 5 m/s is 27.5, 33 and 35.2 % respectively
Antagonistic Activity of Pseudomonas Fluorescens Against Fusarium Oxysporum f. sp. Nievum Isolated from Soil Samples in Palestine
No full textWatermelon is an important summer crop in Palestine, for several decades filling the needs of local market and some Arab countries. The yield of watermelon decreased dramatically in recent years due to severe infections with the soil borne fungal pathogen Fusarium oxysporum f. sp. niveum (FON). Soil fumigation with methyl bromide was commonly applied by Palestinian farmers until it was recently legally banned. Different control mechanisms were not feasible to overcome problems caused by the disease resulting in decreased watermelon cultivation in Palestine for the past 30 years. In this work, we have experimentally shown that Pseudomonas fluorescens was efficient in controlling FON infection and allowing normal seedling growth of both the root and shoot systems. Field experiments are necessary to further confirm the efficacy of biocontrol application.</jats:p
Almighty Shahrashub types and the oldest Vocational Shahrashub
No full textAbstractOne type of Persian poetry, which was used as an amusement and rather unknown, is âShahrashubâ. Lexically, âShahrashubâ means a person who excites the people by his/ her beauty and, but in literary terms, it refers to the poems in which the poet praises or criticizes the city, people, and courtiers, or describes the artisans, their jobs and crafts. This kind of poetry divided into two categories, i.e. vocational and urban, has much benefit sociologically, due to including technical words and terms, as well as historically, politically, economically, and socially. Also, the vocational ones have educational features. Those written for describing jobs are stanza and quatrain, and those praising or criticizing a city are often in the form of elegy or couplet. âShahrashubâ can be found in Urdu, Arabic, and Turkish as well as Persian. However, in answering from what nation it is originated, it should be noted that professor Gibb, in his book âTurkish History of Literatureâ named this type of poetry as one of the Osmaniansâ inventions, but Edward Brown, unlike unaware of Masud Saâdâs Shahrashubs in the 5th century, doubted about Gibbâs assumption. Regarding the Urdu poets, the author of âKhorasani Style in Persian Poemâ affected by âArgumentsâ by Seyed Abdollah attributes the first Shahrashub to the Lahuri poet in India; however, providing some earlier documents and reasons, the author of âShahrashub in Persian Poemâ rejected Mahjubâs claim and knows it undoubtedly as one of the Iraniansâ inventions.The literature shows the first Shahrashubs by Masud Saâd in Persian; Muhammad Jaâfar Mahjub published an article titled âShahrashubâ in the book âWeekâ, in 1963, and attributed the oldest Shahrashub to Masud Saâd. After that, Golchin Maâani in his book âShahrashub in Persianâ (1966) introduced Masud Saâd as the inventor of this style. After them, other researchers and writers studying the works by Mahjub and Golchin named Masud Saâd as the oldest poets composing Shahrashub; some of them are mentioned here based on the chronology: (Dehkhoda: Shahrashub), (Masaheb: Shahrashub), âSilent Mountainâ (Nourian, 1985: 6), âLiterary Genresâ (Shamisa, 1990: 229), the article âA Review on Shahrashub by Lesani Shiraziâ (Shahrestani, 1997: 5), âPersian Poem Typesâ (Rastgarfasaee, 2001: 227), the article âThe Value and Significance of Shahrashubâ (Keshavarz Ghasemi, 2007: 37), the article âShahrashubâ (Nosrati Siahmezgi, 2007: 28), âLiterary Fun in Persian Poemâ (Daneshpajuh, 2001: 317), the article âSix Shahrashub Recovered from the 10th Centuryâ (Fazeli, Jahad: 2009: 120), and in the last article seen by the writers, there can be found no change in the previous assumptions (Dadabayov, 2012: 80). Studying the Shahrashubs by Masud Saâd, the writers of this article proved that there existed a background on composing Shahrashub by other poets; in other words, composing 92 stanzas in the form of a novel genre was not â¦â¦ and we could not know Masud Saâd as the inventor of this genre since several years before him, some like Ksaee Maruzi wrote some stanza describing professions: florist, launderer, drawer, and poets (Riyahi, 1996: 79, 87, and 88). Even Rudaki, prior to Kasaee wrote a quatrain describing the businesspeople (Nafisi, 2003: 516). Also, there is a quatrain by Abu Abdollah Muhammad Ibne Musa Faralavi, a contemporary poet to Rudaki, whose one verse is available (Lazar, 1982: 45). Moreover, many research resources studying Shahrashub forms, or Mahasti Ganjeiâs poems mentioned him as the first quatrain-writer in this field, which is rejected in this article due to mentioned evidence.Reference1.     Anvari, M. (1993). Divan, 2 vols., Modarress Razavi (ed.), Tehan: Elmi Farhangi.2.     Brown, E. (1985). Iranian Literary History since Safavi to the Present, 4th vol., Yasemi, R. (Persian), Tehran: Book Foundation 3.     Dadabayov, M. (2012). Seifi Bokharaeiâs Shahrashub and its Characteristics. Persian Letter, no. 60, pp. 79-88.4.     Daneshpajuh, M. (2009). Literary Fun in Persian Poetry, Tehran: Tahuri5.     Dehkhoda, A. A. (1999). Dictionary, 5 vols., Tehran: University Press6.     Fazeli, F., Jahad, L. (2009). Six Recovered Shahrashubs from 10th Century, 14th year. Nos. 48&49, Persian Letter, pp. 114-1267.     Ghasemi, R. (1968). Shahrashub. Instruction, No. 8, pp. 436-4418.     Golchin Maâani, A. (1967). Shahrashub in Persian Poetry, 1st ed., Tehranâ Roâyat9.     Keshavarzghasemi, Z. (2007). Value and Significance of Shahrashub in Iranian Literary History, Vol. 8, No. 4, Development in History Teaching Journal, pp. 35-4010. Khalaf Tabrizi, M.H. (1978). Decisive Logic. Tehran: Amirkabir.11. Lazar, G. (1982). Poems by the Oldest Poets in Persian Language, Tehran: Persian Society of France in Tehran12. Ganjavi, Mahasti (1347). poetical work, Corrected by .Sh. Taheri. Tehran: Ibnsina13. Mahjub, M.J (nd.). Khorasani Style in Persian Poetry, 1st ed., Tehran: Ferdows14. ---------------- (2007). Folk Literarute in Iran, 3rd ed., Tehran: Cheshme Press15. ---------------- (1968. Shahrashub. Week Book, no. 90, pp. 86-10416. Masahab, Gh. H. (1977). Persian Encyclopedia, Tehran: Joint Stock Company of Pocketbooks Cooperated by Franklin Press17. Maud Saâd Salman. (2005). Masud Saâd Salmanâs Divan, Introduction by Yasemi, R. Dedicated by Babaee, P. Tehran: Negah18. Mirsadeqi, M. (1997). Artistic Dictionary, Tehran: Mahnaz19. Moatafa Ibne Abdollah Ghostantatanini Roomi Hanafi known as Haji Roomi. (1992). Kashfo zonun an Asami kotob valfonon, 2nd ed., Lebanon, Beirut: Darolkotob Elmiye20. Nafisi, S. (2003). Rudakiâs Environment, his Life and Poems, Tehran: Amirkabir21. Noorian, M. (1985). Masud saâdâs Divan, Isfahan: Kamal22. Nosrati Siah Mezgi, A. (2007). Shahrashub, No. 1, Letter of Persian Language and Literature Academy. Pp. 28-3323.  Padeshah, M. (1984). Anendraj (Compulsive Persian Dictionary), 6 vols., Tehran: Khayyam24. Rastgarfasaee, M. (2001). Persian Poetry Types, Shiraz: Navid25. Riyahi, M. A. (1996). Kasaee, His Life, Thoughts and Poems, Tehran: Elmi.26. Shahrestani, S. Hassan (1997). A Review on Lesani Shiraziâs âShahrashubâ, Documents Treasures, no. 25-26, summer 1997, pp. 3-6.27. Shamisa, S. (1996). Throat Prisoner, Tehran: Sokhan.28. --------------- (1990). Literary Genres, Tehran: Ferdows.ZarrinKub, A. H. (2002). A Poem with no Lie, a Poem with no Dissension. Tehran: Elmi
