Micromachined W-band integrated rectangular waveguide filter utilising SU-8

This paper is a study on the design of microwave waveguide filter suitable for micromachining process. Novel structure and processes are introduced which allow accurate fabrication of low loss waveguide filter. This new technique applies micro-fabrication processes to improve fabrication accuracy. A W-band micromachined rectangular waveguide filter utilizing SU-8 micromachining with CPW input and output ports has been designed. Simulated frequency responses exhibit insertion loss of 1.18 dB across 1 GHz bandwidth for W-band frequency range centered at 93 GHz with return loss better than -20 dB

Penggunaan perisian grafik berkomputer dikalangan pelajar senibina di UKM

Hari ini, penggunaan perisian grafik digital telah menjadi satu keperluan asas bagi bidang kreatif, termasuk seni bina. Teknologi digital yang dahulunya digunakan sebagai alatan elektronik untuk tujuan lakaran yang menggantikan pen dan pensel di masa lalu telah berkembang dengan pesat menjadi teknologi yang lebih holistik yang menawarkan keupayaan baru termasuk pengeditan imej berdefinisi tinggi, pemodelan dan simulasi tenaga dan sistem kerjasama secara langsung. Sehubungan dengan perkembangan teknologi digital dalam industri, Institusi Pengajian Tinggi (IPT) telah selama bertahun-tahun membekalkan industri dengan tenaga kerja yang mahir dan mampu menerapkan teknologi tersebut. Walau bagaimanapun, IPT perlu memastikan bahawa mereka tidak ketinggalan dari arus terkini industri dan memastikan graduan mereka dilengkapi dengan kemahiran terbaru, khususnya dalam aplikasi teknologi digital. Makalah ini bertujuan untuk meneroka persepsi pelajar mengenai pengajaran perisian grafik digital dalam program Sarjana Muda Seni Bina di Universiti Kebangsaaan Malaysia (UKM). Instrumen utama yang digunakan oleh pasukan penyelidik untuk mengumpul data primer adalah dengan kaedah tinjauan, yang dijalankan pada 31 pelajar tahun akhir

Synthesis and Growth Mechanism of Silver Nanowires through Different Mediated Agents (CuCl 2

Silver nanowires (AgNWs) have been synthesized by polyol process through different mediated agents (CuCl2 and NaCl). The presence of cations and anions (Cu(II), Na+, and Cl−) has been shown to have a strong impact on the shape of silver nanostructures. The field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) show uniform nanowires. The UV-vis spectra show that plasmon peak indicated the formation of nanowires. The X-ray diffraction (XRD) pattern displayed that final product was highly crystallized and pure. The growth mechanism of AgNWs was proposed

Dynamic Hazard Identification on SOFC system using Bayesian Network

Accidents are expected when operating SOFC unit system in a plant due to its complexity and operating conditions. SOFC system which consists of risky components such as combustor, reformer, heaters and SOFC stack poses risk of fire and explosion especially due to its high operating temperature. In addition, other factors such as failure rate components, quantity materials, gas leakage and chemical characteristics involved further increase the risks to an alarming level. In reality, these conditions are evolving depending on the current situation which make it challenging in determining the actual risks. Since SOFC technology is still emerging and not widely used, the studies on hazard identification on SOFC system is very minimal. The present work develops a new hazard evolution framework for SOFC system which is mapped into Bayesian network model using open-source software programs, GeNie to bring dynamics in identifying risks and hazards. This allow all potential hazards to be updated in real-time to ensure safe implementation of SOFC unit system in a plant. With this, all factors and evolving conditions contributing to the risks can be estimated with higher precisions to reduce the accidents probability. Sensitivity analysis is also carried out to determine how input parameters influencing the identified hazards. Results showed the probability of fire and explosion occurring in SOFC system is approximately 21% and 7% respectively. Operating conditions (temperature and pressure) are identified as the main causes contributing to the risks. Higher temperature increases risks of Fire from 17% to 21% while higher pressure increases the risks of Explosion from 7% to 18%. The current work identified the occurrence of final hazards in SOFC system dynamically and can be served as guideline for safer implementation of SOFC

Dynamic Hazard Identification on SOFC system using Bayesian Network

Accidents are expected when operating SOFC unit system in a plant due to its complexity and operating conditions. SOFC system which consists of risky components such as combustor, reformer, heaters and SOFC stack poses risk of fire and explosion especially due to its high operating temperature. In addition, other factors such as failure rate components, quantity materials, gas leakage and chemical characteristics involved further increase the risks to an alarming level. In reality, these conditions are evolving depending on the current situation which make it challenging in determining the actual risks. Since SOFC technology is still emerging and not widely used, the studies on hazard identification on SOFC system is very minimal. The present work develops a new hazard evolution framework for SOFC system which is mapped into Bayesian network model using open-source software programs, GeNie to bring dynamics in identifying risks and hazards. This allow all potential hazards to be updated in real-time to ensure safe implementation of SOFC unit system in a plant. With this, all factors and evolving conditions contributing to the risks can be estimated with higher precisions to reduce the accidents probability. Sensitivity analysis is also carried out to determine how input parameters influencing the identified hazards. Results showed the probability of fire and explosion occurring in SOFC system is approximately 21% and 7% respectively. Operating conditions (temperature and pressure) are identified as the main causes contributing to the risks. Higher temperature increases risks of Fire from 17% to 21% while higher pressure increases the risks of Explosion from 7% to 18%. The current work identified the occurrence of final hazards in SOFC system dynamically and can be served as guideline for safer implementation of SOFC