News Archive
Thu, Apr 14, 2011 at 1:30 PM
From the student research expo awards ceremony.
Please congratulate Allan Thomas who came third in the graduate physical
science category and Amber Sierra who received an honorable mention in
the same category.
Congratulations
posted
2010-09-07
6:24:32 am Dr. Don Wold to speak at Science Cafe on Acoustics - Private
Dr. Don Wold to speak at Science Cafe on Acoustics
Dr. Don Wold, Professor Emeritus Physics and Astronomy of UALR will give a general interest level lecture on Acoustics on September 28, 2010:
Acoustics: The Science of Sound
Tuesday, September 28, 2010 from 7:00 pm to 9:00 pm, at Vieux Carre / The Afterthought, 2721 Kavanaugh Blvd (Hillcrest), Little Rock, AR
_______________________________________
http://www.uams.edu/sciencecafelr2/default.asp
www.uams.edu/sciencecafelr2/default.asp
_______________________________________
William Slaton, Ph.D., Associate Professor, Dept. of Physics & Astronomy, University of Central Arkansas, Conway, AR
Donald Wold, Ph.D., Professor Emeritus, Dept of Physics & Astronomy, University of Arkansas at Little Rock, AR
Laura Smith-Olinde, Ph.D., Associate Professor, Dept. of Audiology & Speech Pathology, University of Arkansas for Medical Sciences, Little Rock, AR
posted 1/20/2010 10:01 am
Dr. Seo’s research:
Dr. Seo’s research involves the use of nitride semiconducting nanostructures and films to explore highly efficient light/electron emitting diodes and solar cell devices. Recent achievement in fabricating and understanding low-dimensional materials has introduced a novel device architecture, such as nano-scale vertical phototransistors, nano PiN diodes and multi-junctioned nano solar cells, which opened up a new avenue in optoelectronic applications. The parts of her results were published in high impact journals, such as Applied Physics letters and Physical Review B, which were also selected as Virtual Journal of Nanoscale Science & Technology.
posted 2010-01-20
9:52:04 am Interview with Dr. J. Cui about Nano Technology - Private
Briefly discuss your current research that involves nanotechnology. Because the majority of our readers are not scientists, try your best to use familiar terminology when possible or explain unfamiliar terminology. If you have written a paper on this project, please attach.
In Dr. Jingbiao Cui’s lab, semiconductor nanostructures including nanowires, nanocrystals, and nanostructured thin films are being investigated. These materials have dimensions in the range of tens to hundreds nanometers. The research focus is on the material growth, electrical and optical property characterization, and potential applications in optoelectronics. We try to make controlled growth of the nano objects in desired location to make addressable devices and photonic devices [paper1]. We are also working on doping these nanomaterials, i.e. introducing impurities into them to tune their optical, electrical, and magnetic properties. For example, ZnO is one of the most important materials for optoelectronic applications. However, its p-type doping is hard to achieve, which hampers its practical applications. We developed a low temperature electrochemical process to realize p-type ZnO nanowires [paper2]. We also introduced transition metals into ZnO nanowires to introduce magnetic properties, which makes diluted magnetic semiconductor possessing both semiconductor and magnetic properties for spintronics applications [papers 3,4]. The spintronics utilize both electron charge and spin for device function. Currently used transistors use only the electron charge. ZnO nanowire arrays are used as charger collectors for high efficiency dye-sensitized and p-n junction solar cell with low cost. In this regard, we have a GREEN solar cell team working on the next generation solar cells. Plasmonic nanostructures will be used to enhance local light absorption, and therefore in turn increase the solar cell energy conversion efficiency. We are also use nanomaterials as chemical and gas sensing elements for advanced sensor applications.
Are other scientists involved with this project? If so, please name them with their affiliated institution.
Yes, Mr. Allan Thomas, Ph.D candidate, UALR; Professor Ursula Gibson from Dartmouth College; Professor Lothar Ley from University of Erlangen, Germany; and professors Tar-pin Chen and Ha-won Seo from UALR,.
Describe practical applications for the research.
Some of the applications are mentioned in part 1. Our research have potential applications mainly in electronic and optoelectronic devices such as sensors and detectors, light emitting diodes, solar cells, spintronics, transistors, and power generators for nano devices.
Give us your brief bio or CV (or attach one).
Dr. Cui got his Ph.D in Physics from University of Science and Technology of China. Prior to joining UALR in 2006, he was doing nanotechnology research in a few world-renowned institutions including Division of Electronic Materials and Devices, University of Cambridge, UK; Nanoscale Science Department, Max-Planck-Institute for Solid State Research, Germany, and Center for Nanomaterials Research, Dartmouth College. His research has been mainly focused on nanostructured carbon, carbon nanotubes, metal nanoparticles, and wide bandgap semiconductor nanowires and nanocrystals. He has two patents and more than 60 publications in scientific journals. One of his patents is “Field effect transistor memory cell, memory device and method for manufacturing a field effect transistor memory cell” which uses individual nanotubes as building blocks for nanodevices.
Why did you decide to come to UALR?
Arkansas is striving to develop nanotechnology and has invested big funds in this area, especially to UALR. This provides the necessary infrastructures and the potential for future research in nanoscience and nanotechnology.
posted 1/20/2010
1. What impact do you think nanotechnology will have on scientific research in the next five years?
Nanotechnology has been used in many of the products already and will continue impact every aspects of our life in the future. In the next five years, nanotechnology will continue to drive scientific research to move faster ever than before. It will provide cutting-edge scientific equipment and tools for science research, which makes it possible to look the world deep inside. This will promote the research to a new level such as manipulation of molecules and atoms, understanding of biological phenomena on molecular level, development of molecular devices. Our GREEN solar cell project is essentially based on nanotechonology to manipulate electromagnetic wave (light) and charges for highly efficient next generation solar power applications with expectation of low cost of materials and fabrication processes.
Student Lunch for Our Physics and Astronomy Students 3/3/2010 on the UALR Campus
posted 2009-11-12 1:45:21 pm
New Course: Astrophysics–ASTR 4301/5301The Department of Physics and Astronomy will be offering a new astronomy course, ASTR 4301/5301 Astrophysics. This new course is for upper-level undergraduates and graduate students.
Anyone who has a keen interest in astronomy should really think about
enrolling in this course.
This course will cover properties of stars, stellar lifecycles, galaxies
in the Universe and cosmology, using physics you would have learned in
your Physics 1 and 2 courses.
If you have any questions please e-mail Dr. Marc Seigar:
Dr. Marc Seigar - mxseigar@ualr.edu
posted 2009-12-03
12:52:32 pm
PHYS 3350: Electronics TR 1:00-2:50 pm, PHYS 201
The electronics course in physics provides a hands-on learning experience in basic analog and digital systems. Topics include basic DC and AC circuits, diodes, bipolar and field-effect transistors, operational amplifiers, Boolean algebra, digital gates, flip-flops and multivibrators, counters and registers, analog-to-digital and digital-to analog conversion, and the basics of computer-based data acquisition.
posted 2009-12-03 12:49:04 pm
Medical Physics: PHYS 3330 Spring 2010
PHYS 3330: Medical Physics Spring 2010 TR 9:25-10:40 am PHYS 103
Text: “Physics of Radiology” by A.B.Wolbarst
Medical Physics covers the principles and techniques in the use of ionizing and non-ionizing radiation to detect, diagnose, and treat human illness and injury. This course will present an overview of the main topics within the current field of medical physics: radiological physics and dosimetry, radiation biology, health physics and radiation protection, imaging techniques via x-rays, positrons, radioisotopes, ultrasound, and magnetic resonance, including both conventional planar and digital computed tomographic methods, radiation oncology, external beam therapy and brachytheraphy.
Course Prerequisites:
PHYS 1321/1322 or PHYS 2321/2322 or an equivalent experience
At least one previous course in General Biology (High School or University level)
At least one previous course in General Chemistry (High School or University level)
College Algebra
Special Features:
Mix of Lecture and Activity-Based Learning
At least 2 Laboratory Experiences at LR Clinical Sites
Guest Presenters from Clinical Professions
Term Paper on a Forefront Topic in Medical Physics
For more information or questions about this course, contact Dr. Al Adams of the UALR Physics and Astronomy Department at 569-3498 or HYPERLINK “mailto:ajadams@ualr.edu” ajadams@ualr.edu
Dr. Marcus Seigar will be Keynote Speaker at Arkansas Academy of Science April 3 & 4 April 2009 5:00 pm
Dr. Marcus Seigar, assistant professor of physic and astronomy at UALR, will be the keynote speaker at the 93rd meeting of the Arkansas Academy of Science Friday and Saturday, April 3 and 4, at the University of the Ozarks in Clarksville.
http://ualr.edu/www/2009/03/24/seigar-to-keynote-arkansas-academy-of-science/
24 June 2008 8:43 am
Dr. Seigar has had his NASA EPSCoR proposal funded. This is a joint
proposal with the Physics Department of the University of Arkansas at
Fayettville to study Supermassive Black Holes. Dr. Seigar will receive
approximately $395,000 and he is seeking a post doctoral fellow.
12 June 2008 8:33 am
Dr. Jingbiao Cui’s presentation in the 8th Material Reasearch Society International Joint Conference June 9-June 12 in Chongqing, China was highlighted and posted on the MRS website. Low Temperature Doping of ZnO Nanostructures
It can be seen at
http://www.mrs.org/s_mrs/doc.asp?CID=14934&DID=212416
Material Reasearch Society International Joint Conference, Chongqing, China
15 May 2008 10:53 am
Dr. Seigar’s Research Highlighed in New Scientist And AAS 2008 St. Louis meeting June 5, 2008
Here is part of a presentation from Dr. Marc Seigar
See Youtube - Dr. Marc Seigar- - University of AR-Little Rock
See Youtube - Dr. Marc Seigar- - University of AR-Little Rock
Dr. Seigar’s research on black holes highlighted in New Scientist
http://space.newscientist.com/article/dn13624-galaxies-spiral-arms-may-betray-black-holes-weight.html