467 research outputs found
Data for Numerical studies of cavitation erosion on an elastic-plastic material caused by shock-induced bubble collapse
No full textDataset supports:
Turangan, C., Ball, G., Jamaluddin, R., & Leighton, T. (2017). Numerical studies of cavitation erosion on an elastic-plastic material caused by shock-induced bubble collapse. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 473(2205)</span
The collapse of single bubbles and approximation of the far-field acoustic emissions for cavitation induced by shock wave lithotripsy
No full textRecent clinical trials have shown the efficacy of a passive acoustic device used during shock wave lithotripsy (SWL) treatment. The device uses the far-field acoustic emissions resulting from the interaction of the therapeutic shock waves with the tissue and kidney stone to diagnose the effectiveness of each shock in contributing to stone fragmentation. This paper details simulations that supported the development of that device by extending computational fluid dynamics (CFD) simulations of the flow and near-field pressures associated with shock-induced bubble collapse to allow estimation of those far-field acoustic emissions. This is a required stage in the development of the device, because current computational resources are not sufficient to simulate the far-field emissions to ranges of O(10 cm) using CFD. Similarly, they are insufficient to cover the duration of the entire cavitation event, and here simulate only the first part of the interaction of the bubble with the lithotripter shock wave in order to demonstrate the methods by which the far-field acoustic emissions resulting from the interaction can be estimated. A free-Lagrange method (FLM) is used to simulate the collapse of initially stable air bubbles in water as a result of their interaction with a planar lithotripter shock. To estimate the far-field acoustic emissions from the interaction, this paper developed two numerical codes using the Kirchhoff and Ffowcs William–Hawkings (FW-H) formulations. When coupled to the FLM code, they can be used to estimate the far-field acoustic emissions of cavitation events. The limitation of the technique is that it assumes that no significant nonlinear acoustic propagation occurs outside the control surface. Methods are outlined for ameliorating this problem if, as here, computational resources cannot compute the flow field to sufficient distance, although for the clinical situation discussed, this limitation is tempered by the effect of tissue absorption, which here is incorporated through the standard derating procedure. This approach allowed identification of the sources of, and explanation of trends seen in, the characteristics of the far-field emissions observed in clinic, to an extent that was sufficient for the development of this clinical device
Prediction of far-field acoustic emissions from cavitation clouds during shock wave lithotripsy for development of a clinical device
No full textThis study presents the key simulation and decision stage of a multi-disciplinary project to develop a hospital device for monitoring the effectiveness of kidney stone fragmentation by shock wave lithotripsy (SWL). The device analyses, in real time, the pressure fields detected by sensors placed on the patient's torso, fields generated by the interaction of the incident shock wave, cavitation, kidney stone and soft tissue. Earlier free-Lagrange simulations of those interactions were restricted (by limited computational resources) to computational domains within a few centimetres of the stone. Later studies estimated the far-field pressures generated when those interactions involved only single bubbles. This study extends the free-Lagrange method to quantify the bubble–bubble interaction as a function of their separation. This, in turn, allowed identification of the validity of using a model of non-interacting bubbles to obtain estimations of the far-field pressures from 1000 bubbles distributed within the focus of the SWL field. Up to this point in the multi-disciplinary project, the design of the clinical device had been led by the simulations. This study records the decision point when the project's direction had to be led by far more costly clinical trials instead of the relatively inexpensive simulations. <br/
Hingar-bingar pasar pengalaman (2004): satu kritikan dalam memahami diri T. Alias Taib / Nur Nafishah Azmi and Ibrahim Jamaluddin
No full textHingar bingar merupakan keadaan bising, riuh-rendah, hiruk-pikuk dan semua orang berteriak-teriak sehingga suasana menjadi tidak tenteram. Itu adalah perasaan seseorang apabila menjejakkan kaki ke pasar. Perasaan ini berbeza apabila penulis membaca Pasar Pengalaman (2004), daripada T. Alias Taib. Pasar yang diterjemahkan dalam buku Antologi Puisi Pasar Pengalaman (2020) adalah falsafah diri T. Alias Taib sendiri. Kajian ini akan membawa satu pelayaran kepada pengalaman yang telah dialami oleh T. Alias Taib pada ketika puisi ini dituliskan seterusnya membuktikan bahawa keadaan hingar bingar di pasar masih wujud sehingga saat ini. Bagi merealisasikan pelayaran kajian ini, kaedah yang akan digunakan adalah kritikan sastera yakni menggunakan tafsiran terhadap karya sastera dalam menganalisis, sambil melihat konteks yang kompleks untuk memberi pemahaman mengenai bagaimana puisi yang dipilih sesuai dengan pengalaman manusia yang tidak pernah pupus. Pelayaran pengalaman Pasar Pengalaman akan membawa pembaca sedar akan kewujudan falsafah diri T. Alias Taib masih hidup sehingga kini. Teori fenomenologi-rasa akan menjadi sandaran kepada kajian ini yang mana ia akan menjelaskan dua jenis struktur iaitu multi-layered dan quasi temporal. Ini akan ditambahkan lagi dengan penerangan rasa yang dijelaskan Bersama fenomenologi iaitu tuntutan kepada emosi. Proses ini akan memberi jawapan kepada memahami diri penulis puisi yang merupakan teras dan lambang keperibadian beliau dalam dunia serba moden. Diakhir pelayaran pengalaman ini, diharapkan ia menjadi satu titik tolak kepada pemikir di luar sana agar memahami dan menjiwai setiap bait puisi yang dihasilkan dengan rasa hati yang cerdik dan berlapang dada dengan pemahaman diri manusia. Falsafah diri ini merupakan ilmu yang perlu diamalkan kerana ilmu tanpa amal ibarat pokok tanpa buah
Pengaruh Evaluasi Holistik Terhadap Outcome Pembelajaran Humanistik dalam Pendidikan Agama Islam Era Kurikulum Cinta di SMP Syeh Jamaluddin Sukosongo
No full textPengaruh evaluasi holistik terhadap outcome pembelajaran humanistik dalam pendidikan agama islam era kurikulum cinta dikaji dalam penelitian ini. Metode kuantitatif digunakan dalam penelitian dengan hasill analisis menunjukan, variabel evaluasi yang diperoleh dari data angket yang di ujikan kepada 30 siswa, bahwa R valuasi (koefisien koneksi) sebesar 0,450 atau 45%, hal ini menunjukkan bahwa tingkat relevansi evaluasi holistik di SMP Syeh Jamaluddin Sukosongo sebesar 45%. Nilai R2 (koefisien jaminan) sebesar 0,855 atau sebesar 85,5%, sehingga variabel evaluasi holistik merupakan salah satu unsur dengan prosentase 85,5% dengan kategori baik. Hasil analisis dengan paired sample t-test dapat dilihat dan dicermati beberapa nilai diantaranya: Nilai mean atau rata-rata dari pre-test adalah 75,16 dan nilai mean dari post-test adalah 90,22. Dari dua nilai tersebut didapat nilai selisih mean adalah 15,06. Hasil uji t dapatomenyimpulkan bahwa Nilai thitung sebesar 4.374 dan ttabel 1.701 dan signifikansi sebesar 0.864 sehingga thitung 4.274 > ttabel 1.701 dan 0.864 > 0.05. Hal tersebut menunjukkan bahwa ada pengaruh evaluasi holistik terhadap dan outcome pembelajaran humanistic dalam pendidikan agama pada era kurikulum Cinta bagi peserta didik di SMP Syeh Jamaluddin Sukosongo.Pengaruh evaluasi holistik terhadap outcome pembelajaran humanistik dalam pendidikan agama islam era kurikulum cinta dikaji dalam penelitian ini. Metode kuantitatif digunakan dalam penelitian dengan hasill analisis menunjukan, variabel evaluasi yang diperoleh dari data angket yang di ujikan kepada 30 siswa, bahwa R valuasi (koefisien koneksi) sebesar 0,450 atau 45%, hal ini menunjukkan bahwa tingkat relevansi evaluasi holistik di SMP Syeh Jamaluddin Sukosongo sebesar 45%. Nilai R2 (koefisien jaminan) sebesar 0,855 atau sebesar 85,5%, sehingga variabel evaluasi holistik merupakan salah satu unsur dengan prosentase 85,5% dengan kategori baik. Hasil analisis dengan paired sample t-test dapat dilihat dan dicermati beberapa nilai diantaranya: Nilai mean atau rata-rata dari pre-test adalah 75,16 dan nilai mean dari post-test adalah 90,22. Dari dua nilai tersebut didapat nilai selisih mean adalah 15,06. Hasil uji t dapatomenyimpulkan bahwa Nilai thitung sebesar 4.374 dan ttabel 1.701 dan signifikansi sebesar 0.864 sehingga thitung 4.274 > ttabel 1.701 dan 0.864 > 0.05. Hal tersebut menunjukkan bahwa ada pengaruh evaluasi holistik terhadap dan outcome pembelajaran humanistic dalam pendidikan agama pada era kurikulum Cinta bagi peserta didik di SMP Syeh Jamaluddin Sukosongo
PEMIKIRAN JAMALUDDIN ABDUL RAZIQ TENTANG PENYATUAN KALENDER ISLAM INTERNASIONAL DAN IMPLEMENTASINYA DI INDONESIA
No full textMankinds needs a calendar as a regulator and time divider. Especially for Muslims, the need for a calendar is very urgent because there are many Muslim worships related to time, such as the Hajj, Ramadan fasting and other purposes. There are two systems of calendars based on the circulation times of heavenly bodies. First, the Christian calendar is a dating system based on the average circulation of the Earth around the Sun (Solar System). Second, the Hijri Calendar is a calendar based on the average circulation of the moon around the Earth (Lunar System). The criteria clearly affect the uncertainty of the Islamic Calendar. Then it is necessary to unite the Islamic calendar universally. One of the initiators in uniting the Islamic calendar is Jamaluddin Abdur Raziq which is contained in at-Taqwim al-Qamariy al-Islam al-Muwaahid or famous for the term Universal Islamic Calendar. This idea arises because of the differences that often occur in beginning and ending the beginning of the lunar month. In this concept Jamaluddin Abdur Raziq hopes that all Muslims throughout the world have a permanent Islamic calendar. The method applied in this paper is descriptive analysis. The author will describe the concept of Jamaludin Abdur Raziq's idea of the unification of the Islamic Calendar. After describing it, then it will analyze the implementation of the idea of Jamaludin Abdur Raziq in Indonesia
Evolution of ICT infrastructure in UiTM / Rozita Mengen and Jamaluddin Johan
No full textThe article is about the evolution of UiTM ICT infrastructure, in general. Objective of the article review is to inform and record the changing technology applied throughout the years. The information will circulate around topics on the growth of network communications services that supports UiTM applications over the years. Method of identifying data is based on information reviewed from the paper written by the first author and the work experiences from both authors in the field. Findings from the collection of data will be a general chronological evolution of the entire ICT infrastructure system in UiTM for both intranet and the Internet link. These explanation enables the understanding on how ICT infrastructure evolution and growth in UiTM and can be referred to as a guideline for current or future administrators
Numerical studies of cavitation erosion on an elastic-plastic material caused by shock-induced bubble collapse
No full textWe present a study of shock-induced collapse of single bubbles near/attached to an elastic-plastic solid using the free-Lagrange method (FLM), which forms the latest part of our shock-induced collapse studies. We simulated the collapse of 40 um-radius single bubbles near/attached to a rigid and aluminium walls by a 60 MPa-lithotripter shock for various scenarios based on bubble-wall separations, and the collapse of a 255 µm-radius bubble attached to an aluminium foil with a 65 MPa-lithotripter shock. The coupling of the multi-phases, compressibility, axisymmetric geometry and elastic-plastic material model within a single solver has enabled us to examine the impingement of high speed liquid jets from the shock-induced collapsing bubbles, which imposes an extreme compression in the aluminium that leads to pitting and plastic deformation. For certain scenarios, instead of the high speed jet, a radially inwards flow along the aluminium surface contracts the bubble to produces a ‘mushroom shape’. This work provides methods for quantifying what parameters (e.g. bubble sizes and separations from the solid) might promote or inhibit erosion on solid surfaces
Pengenalan BIPA melalui Materi, Strategi dan Teknik dalam Pengajaran di Kabupaten Aceh Barat, Provinsi Aceh
No full textIntroduction to Indonesian Language for Foreign Speakers (ILFS) through materials, strategies and techniques in teaching is a Community Service Activities (CSA) which was aimed to provide training and introduction to ILFS in West Aceh District, Aceh Province. This activity was carried out on 23 to 25 May, 2022 with the theme “Technical Guidance and Introduction the Basics of ILFS Teaching for Lecturers, Teacher Candidates, and ILFS Activists”. For the theme “Materials, Strategies and Techniques in Teaching ILFS” delivered by Jamaluddin Nasution was held on 24 May 2022 from 08.00 A.M. – 5.00 P.M. The ILFS teaching materials provided were: 1) opening class; 2) compiling syllabus and lesson plans; 3) culture and tourism in teaching ILFS; 4) choosing the appropriate material; and 5) game materials in teaching. This Community Service Activity was also carried out by donating a book from the author entitled “Culture Shock in Uzbekistan” to the Language Center of Teuku Umar University West Aceh Regency. In this case, ILFS teaching can be used as a medium and a means of linguistic diplomacy to introduce Indonesia to foreign countries. Therefore, ILFS needs introducing to the community, especially lecturers, teachers and ILFS activists. This activity aimed to encourage them to actively participate in teaching ILFS both at domestic and abroad. Thus, ILFS can be used as a medium and a means of diplomacy that helps the Indonesian government to introduce Indonesian language and culture to the international world
Factors influencing the fixed deposit return in Perbadanan Hal-Ehwal Bekas Angkatan Tentera (PERHEBAT). Case study: Affin Bank Berhad / Nadiah Jamaluddin
No full textThis study was conducted to find out the significant of the factors influence the dependent variable with the independent variable. The variables selected are return gain in Fixed Deposits, interest rate by Affin Bank Berhad and the amount lend by Perhebat. The dependent variable is the return gains. The method used for this study is regression analysis. The result had interpret base on descriptive analysis, R squared analysis, hypotheses analysis (T-test), adjusted R squared and Durbin Watson. The data used were from the OBM system by Perhebat from years 2007 until 2010 with one month investment on selected month. Based from the result, the interest rate and the amount of lending have positive relationship toward the return gains by Perhebat
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