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World Journal of Nuclear Science and Technology 2016年第1期6卷 79-88页

作者： anwar Ilmar ramadhan Ery Diniardi Rasma Mechanical Engineering Department Faculty of Engineering Universitas Muhammadiyah Jakarta Jakarta Indonesia Automotive and Heavy Equipment Department Faculty of Engineering Universitas Muhammadiyah Jakarta Jakarta Indonesia

Development and use of nuclear energy is currently growing very rapidly, in order to achieve increasingly advanced technology, both in terms of design, economic factors and safety factors. Thermal-hydraulics aspects of nuclear reactors should be done with calculation and near-perfect condition. Including today began development of a nuclear reactor with low power below 300 MW, or commonly called the Small Modular Reactor (SMR). One is CAREM-25 developed by Argentina with a power of 25 MW, where in CAREM already using natural circulation system and the use of nanofluid as coolant fluid. In this research, analytic modeling of thermal-hydraulics nuclear reactor SMR CAREM-25, when the nanofluid Al2O3-Water used as cooling fluid in the cooling system of a nuclear reactor. Further to this analytic modeling will be done on CFD. Analytic modeling with CFD to determine the flow phenomena and distribution as well as the effect of nano-particles of Al2O3-Water based on the volume fraction (1% and 3%) of the coefficient of heat transfer by natural convection.

关键词： Nanofluid Nano-Particles Natural Convection Thermal-Hydraulic Coefficient of Heat Transfer

Development Program of Chemical Industry Based Computer Assisted Instruction for Students of Industrial Engineering Department in Indonesia

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Open Journal of Applied Sciences 2016年第6期6卷 327-335页

作者： Leola Dewiyani anwar Ilmar ramadhan Ery Diniardi Industrial Engineering Department Faculty of Engineering Universitas Muhammadiyah Jakarta Jakarta Indonesia Mechanical Engineering Department Faculty of Engineering Universitas Muhammadiyah Jakarta Jakarta Indonesia

This study aims to improve the competence of students of the Department of Industrial Engineering in Indonesia in the subject of Chemical Industry, in particular through the model-based teaching materials CAI (Computer Assisted Instruction) in the form of an interactive CD. In particular, the study was carried out for the purposes of: 1) designing and developing models of devices based learning CAI (Computer Assisted Instruction) systematically in prototype form, 2) producing an interactive CD as a model learning devices Chemical Industry based CAI (Computer Assisted Instruction) to improve the competence of students of the Department of Industrial Engineering in Industrial chemistry courses. The benefits of this research are: 1) for the government, the results of this study can be used as a reference in implementing educational policies, especially to enhance the nation’s competitiveness in the era of informatics;and 2) for the Department of Industrial Engineering in Indonesia, the results of this research can be used to enhance learning that can improve the competence of students in the subject of Chemical Industry, which in turn can be passed with high achievement. Products produced in the first year are a design-based teaching materials CAI (Computer Assisted Instruction) in prototype form, with the following steps: 1) pre- production which includes needs analysis, identifying and analyzing the needs based on the content of curriculum and learning model based CAI (Computer Assisted Instruction), the development of a concept related to Chemical Industry, the development of multimedia content that includes developing materials, animation, and evaluation related to industrial chemicals, gathering material to make the recording sound, shooting, and editing with regard to the development of teaching materials chemical Industry based CAI (Computer Assisted Instruction), as well as developing the storyboard as the layout of the multimedia contents by involving experts

关键词： Development Competence Industry CAI Chemical

Angiosarcoma of the mandible: Metastasis from a primary tumor of the right atrium of the heart

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Case Reports in Clinical Medicine 2013年第1期2卷 53-57页

作者： anwar ramadhan Helena Willén Andreas Thor Department of Plastic & Oral and Maxillofacial Surgery Institute of Surgical Sciences Uppsala University Uppsala Sweden

Angiosarcoma of the heart is a rare tumor with very poor prognosis especially in a patient with multiple metastases. We present a case of a 39-year-old woman with angiosarcoma of the heart metastasing to the right sid... 详细信息

关键词： Angiosarcoma Heart Pathological Fracture Metastasis Mandible

Surgical Correction for Paralytic Strabismus Using T-Plate Anchor

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Open Journal of Ophthalmology 2014年第2期4卷 31-35页

作者： anwar ramadhan Raed Behbehani Mishari Dahrab Haitham Murad Al-Bahar Ophthalmology Center Kuwait City Kuwait Department of Oral and Maxillofacial Surgery Amiri Hospital Kuwait City Kuwait

External or internal ophthalmoloplegia will result in a complete or a partial ocular dysmotility leading to a debilitating and variable manifest binocular diplopia for a majority of the patients. Complete third, forth and sixth nerve cranial nerve palsies are among the many number of etiologies appearing as paralytic strabismus. Successful clinical management, elimination of symptomatic diplopia in the primary field of gaze and increased binocular field of motor and sensory fusion as a result of the oculomotor nerve (III) palsy are challenging tasks for physicians facing this difficult clinical entity. Here we report a novel surgical technique in the clinical management of this disease through suture-fixation of medial rectus muscle onto Titanium plate (T-plate) already anchored into the nasal orbital wall.

关键词： T-Plate Paralytic Strabismus Anchor

Is the immediate use of guided bone regeneration on exposed dental implant threads beneficial?

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Open Journal of Stomatology 2013年第8期3卷 433-439页

作者： anwar ramadhan Abdulaziz Ali Hessah Aljiran Kholoud Hasan John Madda Department of Oral and Maxillofacial Surgery Al-Amiri Hospital Kuwait City Kuwait Department of Pathology Al-Amiri Hospital Center Kuwait City Kuwait

Thin buccal bone has a risk of thread exposure, and placement of a graft is the mainline of treatment for thread exposure. However, this process takes time as the patient is expected to wait for healing to occur before the implant can be placed. To overcome the waiting period, this study views a different method. This study examines the use of guided bone regeneration on the day of implant placement on buccal bone where thread exposure occurs. This process has the advantage of avoiding the patient to go through multiple operations till receiving the final prosthetic treatment, also saving time and money for both the patient and the practitioner.

关键词： GBR Implant Threads Exposed

Analysis Magnetization Current of Harmonic Phenomena and Power Factor as Indicators of Core Saturation at Transformer 3-Phase

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Journal of Power and Energy Engineering 2016年第5期4卷 1-6页

作者： Erwin Dermawan Deni Almanda Laelatus Zahro anwar Ilmar ramadhan Ery Diniardi Electrical Engineering Department Faculty of Engineering Universitas Muhammadiyah Jakarta Jakarta Indonesia Mechanical Engineering Department Faculty of Engineering Universitas Muhammadiyah Jakarta Jakarta Indonesia

Saturation is a condition in which the magnets are fully transformer cores and generate maximum magnetic flux. Some parts affect the resilience and create distortions that can harm the heart. Core saturation can also increase the temperature and magnetization current transformer. In this study, we proposed a measurement method to obtain the necessary parameters to calculate a reliable indicator of the state of the transformer core saturation. The main effects of nonlinear flow in the transformer core are saturation, eddy current and hysteresis. In saturation, the core transformer is as a source of generating harmonic currents, some of which will flow directly to the primary and secondary windings. The method is based on the magnetization current, the phenomenon of harmonics and power factor is evaluated by measuring the no-load current at three-phase transformer, with a high magnetic flux density imposed. Measurements were taken at each phase of the transformer core. The transformer is connected to a variable voltage variable frequency (VVVF) as a voltage source and the investigation carried out at various flux densities. The results showed that the magnetization current and harmonic phenomena increased significantly when the high magnetic flux density and vice versa injected with power factor declined sharply. This phenomenon can be used as an indication of saturation of the 3-phase transformer core.

关键词： Core Saturation Magnetization Current Harmonic

Effect of Adhesive Type on the Quality of Coconut Shell Charcoal Briquettes Prepared by the Screw Extruder Machine

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Journal of Renewable Materials 2024年第2期12卷 381-396页

作者： Samsudin Anis Deni Fajar Fitriyana Aldias Bahatmaka Muhammad Choirul anwar Arsyad Zanadin ramadhan Fajar Chairul Anam Raffanel Adi Permana Ahmad Jazilussurur Hakim Natalino Fonseca Da Silva Guterres Mateus De Sousa Da Silva Department of Mechanical Engineering Faculty of EngineeringUniversitas Negeri SemarangGunung patiSemarang50229Indonesia Arka Tama Indonesia Co.Ltd.KarawangWest Java41382Indonesia Department of Mechanical Engineering Dili Institute of TechnologyAi-meti Laran StreetDiliTimor Leste

Indonesia is one of the largest coconut-producing countries in the *** utilization of coconut shell waste into briquettes will increase the selling value and become a great export ***,the effect of adhesives on the quality of coconut shell charcoal briquettes made using screw extruder machine has not been widely *** study aims to determine the effect of adhesive type on the quality of coconut shell charcoal *** process of fabricating briquettes in this study included crushing,mixing,blending,pressing,and *** the mixing process,3 types of adhesives were used,namely tapioca flour(Briquette_1),cassava flour(Briquette_2),and modified cassava flour(Briquette_3)with a concentration of 5%of the weight of coconut shell charcoal *** quality of the resulting briquettes and commercial briquettes will be evaluated by moisture content,ash content,volatile matter,fixed carbon,calorific value,density,compressive,and drop test *** results of this research showed that the type of adhesive had a significant effect on the quality of the briquettes *** Briquette_1 had better quality than commercial briquettes(Briquette_4)and other briquette *** test results showed that Briquette_1 produced briquettes with better compressive strength and friability than the other specimens,at 6.95 N/mm^(2) and 4.44%,*** moisture content,ash content,fixed carbon,and calorific value of Briquette_1 have met the requirements set by the Indonesian National Standard(SNI)number ***,the volatile matter content and density of Briquette_1 are by the standards of Japan and the United States America(USA).

关键词： Coconut charcoal briquettes adhesive mixing blending pressing

Esophageal Perforation in Children: Experience in Kurdistan Center for Gastroenterology and Hepatology/Iraq

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Open Journal of Gastroenterology 2014年第5期4卷 221-227页

作者： Adnan M. H. Hamawandi Aram Baram Ali A. G. ramadhan Taha A. Karboli Abdulsalam Y. Taha Ako anwar Department of Anasthesia Sulaimani Teaching Hospital Kurdistan Center for Gastroenterology and Hepatology Sulaymaniyah Iraq Department of Medicine School of Medicine Faculty of Medical Sciences University of Duhok Kurdistan Center for Gastroenterology and Hepatology Duhok Iraq Department of Medicine School of Medicine Faculty of Medical Sciences University of Sulaimani Kurdistan Center for Gastroenterology and Hepatology Sulaymaniyah Iraq Department of Pediatrics School of Medicine Faculty of Medical Sciences University of Sulaimani Kurdistan Center for Gastroenterology and Hepatology Sulaymaniyah Iraq Department of Surgery School of Medicine Faculty of Medical Sciences University of Sulaimani Sulaimani Teaching Hospital Sulaymaniyah Iraq

Background: Esophageal perforation is a rare, but potentially life threatening injury. The etiology and management of this condition have changed overtime. Iatrogenic causes are increasingly recognized and management is evolving towards more conservative approaches. Objective: To review our experience in the management of esophageal perforation in pediatric patients. Patients and methods: This retrospective study was conducted in the Kurdistan center for gastroenterology and hepatology in Sulaimani city. Review of records for cases of esophageal perforation during the period from January 2006 to October 2013 was performed. Results: Ten cases were found to have esophageal perforation. The causes of esophageal perforation were complications of endoscopic dilation for esophageal stricture (n = 7), button battery ingestion (n = 2), complication of esophagoscopy for corrosive injury (n = 1). The mean age was 42 months (range, 18 - 75 months). The diagnosis was made during the procedure in 6 cases, within 12 hours in 2 cases and late in the two cases of battery ingestion. Subcutaneous emphysema and respiratory distress were the main presenting features. The location of perforation was thoracic in 9 cases and cervical in 1 case. Conservative management was successful in 7 patients and surgical closure was done in two patients. One death has been reported. Conclusion: Iatrogenic causes were the most common causes of esophageal perforation. Conservative management with interventions guided by clinical response can have a favorable outcome and may become the best initial treatment strategy in the future. Further larger scale studies are recommended to establish the best protocol for conservative management.

关键词： Dilatation Esophageal Perforation Children Conservative Management Sulaimani