Department of Physics

Department News

Graduate Seminar Announcement for March 31

Mar 28, 2014

*****Seminar Announcement*****
PHYS 600, Monday, March 31, 4:00 pm
Currens Hall 205
All physics faculty and students are invited.

Speaker: Hyung Kwan Kim
Graduate Student, Physics Department, WIU
Title: A Survey for Periodic Massers in Massive Star Forming Regions

Abstract:
The formation of massive stars is not fully understood yet. In order to investigate the early evolution these objects, material around massive protostars must be studied. Often, molecular masers from methanol, hydroxyl, and water molecules can be found in massive star forming regions. Periodic changes in flux density of molecular masers have been observed, and there are theoretical models proposed in the literature to explain the periodicity based on binary systems and protostellar pulsations. Correlated variability between different maser species has also been detected; in particular, Al-Marzouk et al. (2012) reported correlated variability of formaldehyde, methanol and hydroxyl masers in a massive star forming region. To understand the phenomenon of periodic maser flares and its relation to the formation of massive stars, a larger sample of systems with correlated variability of different maser species is needed. We report preliminary results of a monitoring program designed to 1. discover new maser flare systems and 2. investigate correlated variability between different maser species. The talk will focus on the discussion of two sources: G45.47+0.13 where we discovered correlated variability of methanol and hydroxyl maser flares, and G34.26+0.15 that shows no significant variability. In the case of G34.26+0.15, we also detected a broad absorption line (~25 km/s) in two different transitions of hydroxyl (6030 MHz, 6035 MHz), which indicates the presence of a high velocity molecular flow.


Speaker: Suhail Albakheet
Graduate Student, Physics Department, WIU
Title: Laser Applications in Ophthalmology


Abstract:
LASER or Light Amplification by Stimulated Emission of Radiation is an immensely popular technique in medical sciences. It is used in several fields of medical sciences, particularly surgery. However, the most popular application of laser is in ophthalmology, which deals with diagnosis and treatment of conditions of the eye. Several types of lasers are used in ophthalmology. Some of these lasers are Nd:YAG laser, SLT laser and Frequency Doubled Green laser, in addition to several other types of lasers. The use of laser devices in ophthalmology is two-fold. They are used for diagnostic and therapeutic purposes. Lasers can play an instrumental role in diagnosing conditions concerning the Optical Coherence Tomography (OCT), Eye Scanning laser ophthalmology (SLO), Double-Purkinje Image Tracker and multiple-beam interference fringe measurements are some of the diagnostic techniques that make use of lasers. However, the primary use of lasers is in therapeutic applications. In fact, laser is the preferred method of surgery for patients and surgeons alike. A laser surgery is usually done for the treatment of glaucoma, cataract and several other critical conditions of the eye. Although, the success rate of these surgeries is very high, some rare complications occur. A badly done laser surgery can have such a grave impact that it may also lead to vision loss. However, if the surgery is done by a certified professional, using all the safety precaution, then the odds of anything going wrong are rather less.

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