jabatan fizik universiti malaya

SISTEM PERMOHONAN BIASISWA MYBRAINSC Biasiswa MyBrainSc ini terbuka kepada seluruh warganegara Malaysia yang sedang atau akan mengikuti pengajian di peringkat Ijazah Sarjana Muda dan Pasca Ijazah Khas secara sepenuh masa dalam bidang sains tulen iaitu Fizik, Kimia, Biologi dan Matematik di Institusi Pengajian Tinggi Tempatan (IPTA) dan...

TODAY 7-1-16

HEP, Physics Dept and NCPP Seminar:

Tutanon Sinthuprasith (CMS/Virginia)
NEW PHYSICS AT CMS DETECTOR AND BLACK HOLE SEARCHES

3.30 pm
Khamis 7/1/16
Dewan Kuliah Fizik, Jabatan Fizik, UM

Datuk Prof Hj Muhammad Rasat Muhammad meninggal dunia 3.30 ptg hari ini Isnin 12 Okt 2015. Alfatihah.

http://ppssea.kek.jp/2015/

The 4th Particle Physics School in South-East Asia

Department of Physics, Faculty of Science

University of Malaya



You are cordially invited to attend Department of Physics Postgraduate Seminar:

Date : 22 January 2015 (Thursday) / 10:00 AM - 12:00 PM
Venue : Auditorium Fizik (AF), Block C, Department of Physics, UM


Time : 10:00 - 10:30 AM

Title : Electron Reconstruction and Triggering at the CMS Experiment

Speaker : Afiq Aizuddin Anuar (SGR120107)
Supervisors : Professor Dr. Wan Ahmad Tajuddin Wan Abdullah

: Dr. Jyothsna Rani Komaragiri



Abstract:

A review of the electron reconstruction algorithm at the CMS experiment is given. Starting from the initial seeding in the calorimeter and tracker, we go through the trajectory building and cleaning steps done to remove the fake candidates. Two case studies pertaining to identification variable production and triggered region are presented.



Time : 10:30 - 11:00 AM

Title : High porosity reduced graphene oxide film prepared by Langmuir-Blodgett technqiue for anode application in bio-photovoltaic platform experimental physics

Speaker : Muhammad Musoddiq Bin Jaafar (SGR130079)
Supervisors : Dr. Vengadesh Periasamy

: Dr. Kamran Yunus



Abstract:

Langmuir-Blodgett method has always been traditionally utilized in the deposition of two-dimensional structures. In this work however, we employed the method to deposit three-dimensional reduced graphene oxide structures using an unconventional protocol. This was achieved by carrying-out the dipping process after the collapse pressure or breaking point, which results in the formation of an highly porous surface topography. Using Langmuir-Blodgett method, the porosity could be optimized from nanometer to micrometer by varying the number of deposition layer. Employed as bioelectrodes, these three-dimensional reduced graphene oxide structures allow improved adhesion and biocompatibility compared to its’ two-dimensional structures. Higher number of pores improves mass transport of materials increasing the charge sustaining capacity and sensitivity, which could ultimately increase its’ performance for biofuel cells and other electrode based systems. By using this film as anode materials in algae based Biophotovoltiac devices, the performance of algae biofilms grown on RGO and ITO anodes were measured and discussed. Results indicate improved peak power of 0.1481 mWm22 using the RGO electrode and an increase in efficiency of 119%, illustrating the potential of RGO as an anode material for applications in biofilm derived devices and systems.



Time : 11:00 - 11:30 AM

Title : Molecular Gas Properties of M100 with ALMA

Speaker : Jazeel Hussein Azeez (SHC120113)
Supervisors : Dr. Zamri Zainal Abidin

: Professor Dr. Zainol Abdin Ibrahim

: Dr. Hwang Chorng-Yuan



Abstract:

In this project Atacama Large Millimeter/submillimeter Array (ALMA) Science Verification Data have been studied focusing on CO J=1-0 observation of M100 (NGC 4321), anearby 'grand-design' barred spirel galaxy in the Virgo cluster. Due to its proximity (~16 Mpc) and relatively face-on inclination, M100 is an ideal target for molecular gas studies. The reduced and calibrated data products, are reduced using the CASA Software package (Common Astronomy Software Application).



Time : 11:30 AM - 12:00 PM

Title : Plasmonics organic light emitting diode (oled)

Speaker : Siti Munirah Che Noh
Supervisors : Dr. Rozalina Zakaria

: Dr. Woon Kai Lin



Abstract:

A review of the enhancement of the organic light emitting diode (OLEDs) using plasmonics will be discussed. Interaction between light and nanoparticles lead to the increment in efficiency. Localised surface plasmon resonance (LSPR) was responsible to increased local electric field to promote luminescence. It is found that the luminance intensity enhance markedly if the absorption spectrum of nanoparticles matches the emission light spectrum.

SERI - Malaysia Applications are subject to preliminary selection by the relevant national authorities and/or the Swiss diplomatic representation. The short-listed applications are then assessed by the Federal Commission for Scholarships for Foreign Students (FCS) which subsequently takes the final decision.The FCS…

PM CONGRATULATES TWO MALAYSIAN SCIENTISTS FOR WINNING ASEAN AWARDS.

KUALA LUMPUR, Aug 27 2014 (Bernama) -- Prime Minister Datuk Seri Najib Tun Razak today congratulated two Malaysian scientists for winning the prestigious Asean Science and Technology Awards in two separate categories in Indonesia yesterday.

SOURCE : BERNAMA

Read more at: http://www.um.edu.my/mainpage.php?module=News&show=1&id=804

Department of Physics, Faculty of Science

University of Malaya



You are cordially invited to attend Department of Physics Postgraduate Seminar:
Date : 8 May 2014 (Thursday)
Venue : Auditorium Fizik (AF), Block C, Department of Physics, UM



Time : 10:00 - 10:30 AM

Title : Efficacy of Riboflavin and Ultraviolet (A) Combination in the Management of Blood Infections

Speaker : Rishi Aarthi (SGR120007)

Supervisors : Professor Dr. Vikineswary Sabaratnam

: Dr. Vengadesh Periasamy



Abstract:

Blood infection remains as a major global health problem which increases the amount of death rate of patients. It is caused by bacteria and fungus which release toxin into the blood cells and blood plasma. The chromosomal genes or exchange of genetic materials which presents in a number of these pathogens made them resistant toward conventional antibiotics. Therefore, riboflavin [(7, 8-dimethyl-10-((2R, 3R, 4S) -2, 3, 4, 5 – tetrahydroxypentyl) benzo [g] pteridine -2, 4 (3H, 10H) – dione)] which is known as vitamin B2 has been selected to study the possibility of continuous reduction / prevention of pathogenic infections caused through several strains of bacteria and fungus. Riboflavin is a very important vitamin commonly found in the diets of various cultures. Riboflavin has been isolated from a wide variety of animal and plant products. It is water soluble and exists as yellow to orange yellow crystalline powder with a slight odour. The efficacies of riboflavin were measured through the zones of inhibition. Results indicate that riboflavin alone was effective towards Staphylococcus aureus, Enterococcus faecalis, Salmonella typhii, and less effective on Pseudomonas aeruginosa, Klebsiella pneumoniae, Escherichia coli and Candida albicans.

Keywords
Riboflavin, blood-borne pathogens, ariboflavinosis, antipathogenic properties, antifungal, zone of inhibition, dairy products


Time : 10:30 - 11:00 AM

Title : ZnS microsphere-reduced graphene oxide supporter as a highly efficient photocatalyst

Speaker : Mehran Sokhakian (SHC110067)

Supervisor : Professor Dr. Yusoff Mohd Amin

: Professor Dr.Wan Jeffrey Basirun



Abstract:

A facile one-pot method for the fabrication of high quality self-assembled hierarchically ordered macro-mesoporous ZnS microsphere-reduced graphene oxide (RGO) composite without the use of templates or surfactants is described. During the hydrothermal process, reduced graphene oxide (RGO) was loaded into the ZnS microsphere by in situ reduction of graphene oxide added in the self-assembly system. The morphology and structure of the as-prepared composites were confirmed by X-ray diffraction, high resolution transmission electron microscopy, energy dispersive X-ray analysis, Fourier transform infrared spectroscopy and Raman spectroscopy. Incorporation of reduced graphene oxide as an excellent electron-transporting material effectively suppresses the charge recombination. Hence, a significant enhancement in the photocatalytic efficiency for the photodegradation of methylene blue was observed with the ZnS-RGO composite, compared to the pure ZnS. Overall, this research results may lay down new vistas for the in situ fabrication of the ZnS-RGO composite as a highly efficient photocatalysis under visible-light irradiation and their applications in environmental protection.


Time : 11:00 - 11:30 AM

Title : Effect of Charge Balance on Solution Processed Organic Light Emitting Diode (OLED)

Speaker : Calvin Yi Bin Ng (SGR120113)

Supervisor : Dr. Kai Lin Woon



Abstract:

Organic light emitting devices (OLEDs) have received particular attentions due to their potential to provide low cost and easily manufactured solid-state light sources. Over the past few years, dozens of great progresses have been made on organic light emitting diodes regarding the power efficiency of OLEDs. Here, we demonstrate a highly efficient solution-processed yellow fluorescent organic light emitting diode by introducing a layer of fluorinated alcohol onto the active layer. Balanced electron and hole distribution can be realized through this simple method and the mechanism will be presented. This cost-effectiveness approach might even be applied into various organic electronics devices such as OFET and OPV.

Keywords
Charge carrier balance; High efficiency


Time : 11:30 - 12:30 PM

Title : Fabrication of Polymer Microfiber through Direct Drawing and Its Application in Splicing of Silica via V***r Spray and Flame Treatment

Speaker : Kam Wern (SGR120102)

Supervisor : Professor Dr. Sulaiman Wadi Harun

Dr. Rozalina Zakaria



Abstract:

We report the low cost and simple fabrication technique of polymer microfiber with high surface smoothness and length uniformity using a molten polymethyl methacrylate (PMMA) in conjunction with direct drawing technique. The fabricated microfiber with diameter of 1.5 µm and length of 3 mm was successfully used to splice silica microfibers based on solvent v***r spray and flame treatment processes. The permanent splicing was achieved with an average splicing loss of around 0.69 dB. The splicing technique demonstrated here promises high potential for robust optical integration of microfibers for various functional circuits or devices.


Time : 12:30 - 1:00 PM

Title : Study of Electron Beam Initiated Capillary Discharge as EUV Source

Speaker : Daryl Tan (SGR110104)

Supervisor : Professor Dr. Wong Chiow San

Dr. Yap Siong Ling



Abstract:

The electron beam initiated capillary discharge is under investigation as a new technique in generates hot and intense plasma. Compared with other series of capillary discharge, the capability in producing plasma by using high Z material is main advantage for electron beam initiated capillary discharge to be studied as one of the prominent plasma source for various applications. The plasma is formed in a low pressure medium located within a quartz-made capillary channel. Along the plasma formation, the transient hollow cathode discharge plays a significant role in producing pre-breakdown electron beam; under the influence of external electric, the electron beam is accelerates and bombards towards a metal-made anode, which is eventually v***rizes the anode material to be injected into the capillary channel. On the other hand, the bombardment of electron beam initiates the electrical discharge and plasma channel is formed by Joule heating of anode material. The experiment investigation is performed with a low energy system powered by 21.6 nF capacitor by applying various charging voltages. Several diagnostic techniques are carried out to evaluate the mechanism and characterize the plasma produced emission.






All are welcome!