12,357 research outputs found
Unraveling the Regimes of Interfacial Thermal Conductance at a Solid/Liquid Interface
No full textThe interfacial thermal conductance at a solid/liquid interface (G) exhibits an exponential-to-linear cross-over with increasing solid/liquid interaction strength, previously attributed to the relative strength of solid/liquid to liquid/liquid interactions. Instead, using a simple Lennard-Jones setup, our molecular simulations reveal that this cross-over occurs due to the onset of solidification in the interfacial liquid at high solid/liquid interaction strengths. This solidification subsequently influences interfacial energy transport, leading to the cross-over in G. We use the overlap between the spectrally decomposed heat fluxes of the interfacial solid and liquid to pinpoint when “solid-like energy transport” within the interfacial liquid emerges. We also propose a novel decomposition of G into: i) the conductance right at the solid/liquid interface and ii) the conductance of the nanoscale interfacial liquid region. We demonstrate that the rise of solid-like energy transport within the interfacial liquid influences the relative magnitude of these conductances, which in turn dictates when the cross-over occurs. Our results can aid engineers in optimizing G at realistic interfaces, critical to designing effective cooling solutions for electronics among other applications. This data set contains the MD simulation files and post-processing codes to reproduce our results. The dataset is related to the publication by Abdullah El-Rifai, Sree Hari Perumanath Dharmapalan, Matthew K. Borg and Rohit Pillai (2024), "Unraveling the Regimes of Interfacial Thermal Conductance at a Solid/Liquid Interface", Journal of Physical Chemistry C, https://doi.org/10.1021/acs.jpcc.4c00536File structure described in README.tx
Perkongsian ilmu@CSR PUiTMCT & TATIUC: taklimat pencarian maklumat - Open Access Discovery / Asmahani Abdullah
Get PDFPerpustakaan Cendekiawan UiTM Cawangan Terengganu (UiTMCT) dengan kerjasama Fakulti Kejuruteraan Teknologi, Kolej Universiti TATI (TATIUC), Kemaman, telah mengadakan satu program Taklimat Pencarian Maklumat: 'Open Access Discovery' pada 30 September 2021, Khamis. Program selama 2 jam ini mensasarkan pelajar tahun akhir Program Teknologi Kejuruteraan Kimia bagi menyiapkan kerja kursus. Turut hadir pada sesi taklimat tersebut ialah Ts. Dr. Danmuji bin Rifai, Timbalan Dekan Fakulti Teknologi Kejuruteraan, dan Ts. Dr. Siti Ilyani bt. Rani, Ketua Program Teknologi Kejuruteraan Kimia. Taklimat ini disampaikan oleh Cik Asmahani Abdullah, Pustakawan Rujukan, dan turut dibantu oleh pustakawan UiTMCT yang lain
Spectral investigation of thermal conductance at solid/fluid interfaces
No full textRising transistor densities and on-chip clock speeds have yielded increasing thermal loads on modern integrated circuits (ICs), leading to a severe degradation in their performance. As IC cooling is primarily limited by modern single-phase thermal management technologies, this has spurred interest in two-phase cooling devices, which exploit the latent heat of vaporisation of the working fluid to extract significantly greater amount of heat from ICs. Traditionally, the efficiency of heat transfer across the solid/liquid (SL) interface has been disregarded in such processes, given the greater importance of conduction, evaporation, and diffusion in the bulk liquid. However, in emerging micro- and nano-engineered systems, the efficiency of SL energy transport is much more likely to be the bottleneck to performance improvements compared to bulk processes. The SL energy transport is dictated by the interfacial thermal conductance (G), which manifests as a temperature discontinuity across any interface comprising dissimilar materials, hypothesised to be caused by the difference in their vibrational properties. Given its growing relevance to the thermal management of ICs, the nanoscale origins of G must be understood.
There is an extensive literature on the role of structural parameters (work of adhesion, peak density, structuring, etc) on G, but limited insight has been produced. In contrast, the study of spectral parameters (i.e. the vibrational interactions between SL atoms) have recently shown promise and forms the focus of this thesis. A set of new metrics based on the spectral decomposition of heat flux (SDHF) are developed in this work to track how energy is sent and received across the SL interface. Using these metrics, the mechanisms underlying G are investigated for a range of systems in increasing complexity: a) simple Lennard-Jones SL interface; b) a Lennard-Jones SL interface
containing a liquid meniscus; and c) a set of realistic metal/water SL interfaces.
For a simple Lennard-Jones interface, G has been shown to exhibit an exponential-tolinear cross-over with increasing SL interaction strength, previously attributed to the relative strength of SL to liquid/liquid interactions. Instead, this thesis reveals that the cross-over in G occurs due to the onset of solidification in the interfacial liquid at high SL interaction strengths. This solidification subsequently influences interfacial SDHF, leading to the cross-over. The overlap between the spectrally decomposed heat fluxes of the interfacial solid and liquid is used to pinpoint when “solid-like energy transport” within the interfacial liquid emerges. A novel decomposition of G is also proposed, separating it into: (i) the conductance right at the SL interface and (ii) the conductance of the nanoscale interfacial liquid region. It is demonstrated that the rise of solid-like energy transport within the interfacial liquid influences the relative magnitude of these conductances, which in turn dictates when the cross-over occurs.
Next, the thesis focuses on the demonstrated enhancement in solid/liquid energy transport at a nanoconfined SL interface in the presence of a meniscus. The SL interaction strength at Lennard-Jones interfaces is varied for both confined SL and solid/liquid/vapour systems, finding that the presence of a meniscus yields an enhancement in the interfacial thermal conductance across wettabilities. However, the magnitude of the enhancement is found to depend on the surface wettability, initially rising monotonously for low to moderate wettabilities, followed by a sharp rise between moderate and high wettabilities. By computing the in-plane and out-of-plane components of the spectrally decomposed heat fluxes within both the interfacial solid and liquid, it is shown that the initial monotonous rise in conductance enhancement predominantly stems from a rise in the coupling of out-of-plane vibrations within both the solid and the liquid. In contrast, the subsequent sharp rise at more wetting interfaces is linked to sharp increases in the utilisation of the in-plane modes of the solid and liquid. These observations result from the interplay between the SL adhesive
forces and the liquid/vapour interfacial tension.
Finally, the thesis studies the enhancement that G experiences with increasing surface wettability at realistic metal/water interfaces, previously attributed to an increase in the similarity of the permissible vibrations within the interfacial solid and liquid, as quantified by the vibrational density of states (VDOS) Overlap. Instead, it is shown for the first time that the VDOS Overlap is unable to explain increases in G for certain interfaces, and that the change in the magnitude of the VDOS Overlap instead only depends on the position of the VDOS distribution of the solid relative to that of
the liquid. By computing the spectrally decomposed heat fluxes within the interfacial solid and liquid, it is shown that variations in G for a given metal/water interface with increasing surface wettability stem from an increase in the utilisation of the inplane modes of both the interfacial solid and liquid. Meanwhile, variations in G across metal/water interfaces for the same wettability are shown to stem from a change in the degree to which the interfacial solid and liquid utilise their available modes.
The results presented in this thesis provide novel insights into the role of interfacial solid and liquid vibrations in various phenomena, such as: (i) the nonlinearity that G experiences with increasing interaction strength, (ii) the enhancement in G in confined systems brought about by a liquid meniscus, and (iii) the increase in G with increasing surface wettability at realistic interfaces. Additionally, the metrics developed throughout this work demonstrably outperform currently widespread metrics used to investigate G. It is hoped that these results can aid engineers in optimising G at interfaces of interest that are critical to designing effective cooling solutions for electronics. These results have broad application in other areas, such as for improving the heat transfer across plasmonic nanoparticles in various applications such as drug delivery, medical imaging, and thermal therapies
Interview with Abdullah El Tayib
No full textفي هذه المقابلة، يتحدث الأديب والناقد والشاعر السوداني عبد الله الطيب عن مؤلفاته في النقد والقصص الشعبية ودواوينه الشعريه.In this interview, Sudanese author, intellectual, and poet Abdullah El Tayib discusses his collections of poetry, well-known stories, and critical writings
Kuyucaklı Abdullah b. Muhammed el-Aydi’nin Mu’rib-i Avamil-i Cedide adlı eserinin tahkiki
No full textu çalışma, Kuyucaklı Abdullah b. Muhammed el-Aydînî’nin Mu‘rib-i ‘Avâmil-i Cedîde adlı eserinin tahkîki, edisyon kritiğidir. Kuyucaklı Abdullah Efendi ismiyle bilinen müellif, XVII. yüzyılın sonları, XVIII. yüzyılın başlarında Aydın Vilâyetine bağlı Kuyucak kasabasında yaşamış bir âlimdir. Arap dili gramerine dair yedi Arapça eser kaleme almıştır. Tahkikini yaptığımız bu eserde müellif, büyük Osmanlı bilgini İmam Birgivî’nin Arap dili gramerinin temel kurallarını anlattığı el-‘Avâmil adlı meşhur eserin gramer tahlilini yapmakta, bir anlamda teorik kuralları pratiğe dökmektedir. Yapılan bu çalışmayla eser tanıtılmış, müellif nüshasına en yakın nüsha ortaya konularak istifadeye hazır hale getirilmiş ve müellifin bir dilci olarak özellikleri tespit edilmiştir. THE TEXTUAL CRITICISM OF THE BOOK NAMED MURİB-İ AVAMİL-İ CEDİDE BY KUYUCAKLI ABDULLAH b. MUHAMMED el-AYDİNİ This Project is the textual criticism of Kuyucaklı Abdullah b. Muhammed el-Aydıni’s named Murib-i Avamil-i Cedide. As known author who is called Kuyucaklı Abdullah Efendi is a scholar lived in Kuyucak region bounded to Aydın. He wrote seven Arabic Works on the grammar of arabic language.In this book which we have investigated, the author analyses the grammar side of famous book named el-‘Avâmil that is written in it, the basic rules of Arabic language by Great Otoman Scholar Imam Birgivî. On the other side he converts the therotical rules into pratical ones. It has been known by this work creating the replica of The author’s issue(the original text) made it being used and the specifications of the author are detected as a linquistic
El yazması iki Menakıb-ı Seyyid Ahmed Er-Rifai -inceleme ve karşılaştırma-
No full textEL YAZMASI İKİ MENÂKIB-I SEYYİD AHMED ER-RİFÂİ –İNCELEME VE KARŞILAŞTIRMA- Çalışmamıza konu olan Seyyid Ahmed er-Rifâî (1118-1182) hakkındaki yazma iki menâkıbnâme, Prof. Dr. Mustafa Tahralı’nın özel kütübhânesinden temin edilmiştir. Bu iki eser günümüz harflerine çevrildikten sonra birbiriyle karşılaştırılmış ve aşağı yukarı birbirlerinin aynı olduğu ortaya çıkmıştır. Eserler daha sonra Seyyid Ahmed er-Rifâî hakkındaki diğer menâkıbnâmelerle karşılaştırılınca Ebû Bekir b. Abdullah el-Ayderûsî’ye aid olan (ö. 914-1508) en-Necmü’s-sâî fî menâkıbi’l-Kutbi’l-Kebîri’-Rifâî adlı eserin genişletilmiş bir tercümesi olduğu ortaya çıkmıştır. Eserlerde Seyyid Ahmed er-Rifâî’nin tasavvufî yolunun esâsının “fakr” anlayışına dayandığı anlatılmaktadır. Allah katındaki derecesinin çok yüksek olduğuna, tevâzuuna ve yaratılanlara karşı şefkatine dair kerâmetlere yer verilmektedir.THE TWO MANUSCRİPT NARRATİVES SEYYİD AHMED ER-RİFÂÎ - EXPLORİNG AND COMPARİNG – These two narratives, which is the sobject of our study, about Seyyid Ahmed er-Rifâî were supplied from Prof. Dr. Mustafa Tahralı’s special library. After the two manuscripts had been translated to Turkish they were compared with eachother and it was understood that they were almost the same.After that when we compared them with other narratives about Seyyid Ahmed er-Rifâî, it was understood that they enlarged translations of en-Necmü’s-sâî fî menâkıbi’l-Kutbi’l-Kebîri’-Rifâî by Ebû Bekir b. Abdullah el-Ayderûsî’ye aid olan (ö. 914-1508).It is explained in the tranlations that the essence of Seyyid Ahmed er-Rifâî’s religious order is “fakr” (poverty). These works discloses that his place in the sight of Allah is high and he is modest and his miracles about his compassionate for everything
Unraveling the Regimes of Interfacial Thermal Conductance at a Solid/Liquid Interface
No full textThe interfacial thermal conductance at a solid/liquid interface (G) exhibits an exponential-to-linear cross-over with increasing solid/liquid interaction strength, previously attributed to the relative strength of solid/liquid to liquid/liquid interactions. Instead, using a simple Lennard-Jones setup, our molecular simulations reveal that this cross-over occurs due to the onset of solidification in the interfacial liquid at high solid/liquid interaction strengths. This solidification subsequently influences interfacial energy transport, leading to the cross-over in G. We use the overlap between the spectrally decomposed heat fluxes of the interfacial solid and liquid to pinpoint when “solid-like energy transport” within the interfacial liquid emerges. We also propose a novel decomposition of G into: i) the conductance right at the solid/liquid interface and ii) the conductance of the nanoscale interfacial liquid region. We demonstrate that the rise of solid-like energy transport within the interfacial liquid influences the relative magnitude of these conductances, which in turn dictates when the cross-over occurs. Our results can aid engineers in optimizing G at realistic interfaces, critical to designing effective cooling solutions for electronics among other applications. This data set contains the MD simulation files and post-processing codes to reproduce our results. The dataset is related to the publication by Abdullah El-Rifai, Sree Hari Perumanath Dharmapalan, Matthew K. Borg and Rohit Pillai (2024), "Unraveling the Regimes of Interfacial Thermal Conductance at a Solid/Liquid Interface", Journal of Physical Chemistry C, https://doi.org/10.1021/acs.jpcc.4c0053
Analyse générale
No full textEl Erian Abdullah. Analyse générale. In: Annuaire français de droit international, volume 21, 1975. pp. 445-470
Halid B. Abdullah El-Kasri
No full textHALİD B. ABDULLAH EL-KASRÎ Çalışmamızın konusu Adnânilere mensub Becîle kabilesinin Kasr kolundan olan Halid b. Abdullah b. Yezid b. Esed b. Kürz b. Âmir el-Becelî el-Kasrî’dir ki, kendisine Ebu’l-Heysem ve Ed-Dimeşkî de denir. Büyük dedesi Esed b. Kürz ve onun oğlu Yezid b. Esed, Hz. Peygamberin sahabesidir. Halid b. Abdullah’ın doğum tarihi konusunda kaynaklarda bir bilgi bulunmamaktadır. Bir Hıristiyan Rum anneden dünyaya gelen ve annesinin Hıristiyan olması sebebiyle daima eleştiri konusu olan Halid b. Abdullah, siyaset sahnesine ilk defa hicri 89 veya 91 yılında Mekke valisi olmasıyla çıkmıştır. Mekke valisi olmasıyla beraber çalışmalarına Mekke’ye sığınan Iraklıları çıkarmakla başlayan Halid, Kabe’yi tezyin etmek, tavaf esnasında safları Kabe’nin etrafına yaymak, tavafta kadın erkek arasını ayırmak, Kabe’yi ve Safa ile Merve tepelerini aydınlatmak, Zemzemin yanına başka bir su getirmek gibi hizmetlerde bulunmuştur. Hicri 96 yılında Mekke valiliğinden alındıktan sonra 105 yılına kadar neler yaptığı konusunda elimizde bilgi olmayan Halid, 105 yılında Irak valisi olmakla beraber tekrar siyaset sahnesinde ikinci kez yerini almış ve 120 yılına kadar bu görevini sürdürmüştür. Irak valiliği esnasında köprüler yapması, nehirler açtırması, ticaretin gelişmesi için dükkanlar inşa ettirmesi ve para bastırıp, ölçek yapması, bidat ehliyle mücadele etmesi, Hz. Ali ve soyu hakkındaki olumsuz tavrıyla tanıdığımız Halid, zeki, hitabeti güçlü, zengin, cömertliğiyle meşhur olmuş bir kişiliktir. Hicri 126 yılında yerine atanan Irak valisi Yûsuf b. Ömer’in işkencesi altında can veren Halid, 15 yıllık Irak valiliği esnasında sükuneti sağlaması ve Irak’ın gelişmesi için yaptığı çalışmalarla tanınmaktadır. HALİD B. ABDULLAH EL-KASRÎ Le sujet de notre recherche est Halid b. Abdullah b. Yezid b. Esed b. Kürz b. Âmir el-Becelî el-Kasrî aussi apelé Ebu’l-Heysem ou Ed-Dimeşkî, membre des Adnanis de la tribu de Becile de l’embrachement de Kasr. Son grand grand-père Esed b. Kürz et son fils Yezid b. Esed avaient prêtaient foi au Saint Prophète de son vivant. D’autre part, il n’y a aucune trace concernant la date de naissance de Halid b. Abdullah dans les documentations. Il est né d’une mère chrétienne Roumélienne, ce pourquoi il fut toujours critiqué. Halid b. Abdullah fait sa première entrée en scène politique en 89 ou 91 après l’Hégire en tant que préfet de la Mecque. Tout en poursuivant sa fonction, il commença par expulser de la Mecque les réfugiés İrakiens puis rendit divers services comme celui de décorer la Kaaba, étaler les rangs autour de la Kaaba lors de la tavaf (action de tourner autour de la Kaaba), séparer les hommes et les femmes lors de la tavaf, illuminer la Kaaba ainsi que les collines Safa et Marwa et aussi fournir une autre source d’eau à celle de Zemzem. Il fut destitué du poste de préfet de la Mecque en 96 et nous ne possédons aucun renseignement concernant ses activités jusqu’en 105 où il prit pour la seconde fois sa place en scène politique étant nommé au poste de préfet d’İraq et poursuivit cette fonction jusqu’en 120. Lors de sa vacance en préfecture d’İraq, il fit construire des ponts, creuser des cours d’eaux. Pour favoriser le commerce, il fit construire des échoppes et émit de la monnaie, instaura la mesure des grains, et combatit les nouvelles mœurs en contradictions avec l’İslam. Halid connu pour son opinion négative envers Saint Ali et sa descendance, est intelligent, grand orateur, riche, personnalité devenue célèbre de par sa générosité. En 126 de l’Hégire, il mourut en conséquences aux tortures du nouveau préfet d’İrak, Yûsuf b. Ömer. Halid est connu pour la paix qu’il a instauré et les services rendus pour le développement du pays durant ces 15 ans au poste de préfet d’İrak
Interview with Sofie Abdullah
No full textفي هذه المقابلة، تتحدث الكاتبه صوفى عبد الله عن أسرار مهنة الكتابة.In this interview, Sofie Abdullah, a well-known Egyptian author, discusses the intricacies of the writing industry
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