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Articles 1 - 21 of 21
Full-Text Articles in Physical Sciences and Mathematics
Chemometrics And Spectroscopic Analyses Of Peganum Harmala Plant’S Seeds By Laser‐Induced Breakdown Spectroscopy, Tahani A. Alrebdi, Amir Fayyaz, Haroon Asghar, Asif Kamal, Javed Iqbal, Naveed K. Piracha
Chemometrics And Spectroscopic Analyses Of Peganum Harmala Plant’S Seeds By Laser‐Induced Breakdown Spectroscopy, Tahani A. Alrebdi, Amir Fayyaz, Haroon Asghar, Asif Kamal, Javed Iqbal, Naveed K. Piracha
2023 Faculty Bibliography
In the present work, the rapid identification of elements and their relative chemical com‐ position in various Peganum harmala seed samples were investigated using a calibration‐free laser‐ induced breakdown spectroscopy technique (CF‐LIBS). A pulsed Nd:YAG laser‐source with a 5 ns pulse‐duration, and 10 Hz pulse repetition rates providing 400 and 200 mJ energy at 1064 and 532 nm wavelength, respectively, was focused on the Peganum harmala seed samples for ablation. A LIBS 2000+ spectrometer within the wavelength range (200 to 720 nm), emission‐spectra were recorded. The measured spectra of the Peganum harmala sample gives spectral lines of Carbon (C), Magnesium …
Examining The Optical Properties Of Monosodium Urate For The Detection Of Gout Using A Magneto-Optical Device (Mod), Victoria Marino
Examining The Optical Properties Of Monosodium Urate For The Detection Of Gout Using A Magneto-Optical Device (Mod), Victoria Marino
Celebration of Scholarship 2022
The purpose of this research was to quantify the magnetooptical properties of monosodium urate (MSU) crystals that would allow for an easy diagnosis using a magneto-optical device (MOD). Characterization of these magnetic and optical properties was achieved by measuring the transmitted light intensity of a laser shining through a sample of monosodium urate with or without an applied (static) magnetic field. Using our theoretical model under the simplifying assumption that absorption is dominant, we determined that the extinction cross-section is σ𝑥 = 0.0127 cm3 /μg and we determined σ𝑧 using two different relationships which gave two distinctly different values. Due …
3-D Printed Arduino Powered Drone, Michael Floccare
3-D Printed Arduino Powered Drone, Michael Floccare
Senior Honors Projects
With the 3D technology available today creating something in a lab has never been easier. Using 3D printers, the body of a drone is created and printed using a combination of programs. With a body created using PLA filament the drone is durable and light weight. The drone’s flight system and controller are programmed with the built-in software from Arduino. Adding the Arduino nano to the drone body then gives the drone capabilities to fly.
Examining The Optical Properties Of Monosodium Urate For The Detection Of Gout Using A Magneto-Optical Device (Mod), Victoria Marino
Examining The Optical Properties Of Monosodium Urate For The Detection Of Gout Using A Magneto-Optical Device (Mod), Victoria Marino
Senior Honors Projects
Currently, there is a need for a cost-effective and more efficient option for gout diagnosis. Traditionally, gout is diagnosed by the presence of monosodium urate in blood or synovial fluid. The purpose of this research is to quantify the magneto-optical properties of monosodium urate crystals using a magneto-optical device (MOD). Characterization of these magnetic and optical properties is achieved through measuring the initial light intensity and the transmitted light intensity of a laser shone through a sample of monosodium urate with or without a static magnetic field. The comparison of the transmitted intensity through a solution of MSU crystals with …
The Lady Be Good: A Case Study In Radio Frequency Direction Finders, With Supplemental Material For On-Line Appendix, Gregory A. Dilisi, Kenneth Kane, Robert A. Leskovec, Alison Chaney*
The Lady Be Good: A Case Study In Radio Frequency Direction Finders, With Supplemental Material For On-Line Appendix, Gregory A. Dilisi, Kenneth Kane, Robert A. Leskovec, Alison Chaney*
2021 Faculty Bibliography
No abstract provided.
Analyzing The Optical Properties Of Hemozoin To Expand The Disease Detection Applications Of A Magneto-Optical Device (Mod), Kyle Blasinsky
Analyzing The Optical Properties Of Hemozoin To Expand The Disease Detection Applications Of A Magneto-Optical Device (Mod), Kyle Blasinsky
Senior Honors Projects
Hemozoin crystals are the basis of a new approach for efficient, cost-effective malaria detection. Clinical success of malaria detection with a magneto-optical device (MOD) motivates quantification of the optical interactions forming the basis of the detection mechanism. The MOD is used to measure the intensity of polarized light transmitted through a sample of hemozoin suspended in phosphate-buffered saline, subject to a magnetic field, 𝐵 ⃗, that can be turned on and off. According to Beer’s law, ratios of transmitted light with different polarization directions and with on and off as a function of hemozoin concentration were related to change in …
A Case Studies Approach To Teaching Introductory Physics, Gregory A. Dilisi, Alison Chaney*, Stella Mclean*, Richard Rarick
A Case Studies Approach To Teaching Introductory Physics, Gregory A. Dilisi, Alison Chaney*, Stella Mclean*, Richard Rarick
2020 Faculty Bibliography
No abstract provided.
Measurements Of Branching Fractions, Absolute Transition Probabilities And J-File Sum Rule For The 4p(5)5p -> 4p(5)5s Transitions Array In Neutral Krypton, Haroon Asghar, Naveed K. Piracha, Raheel Ali, M. Aslam Baig
Measurements Of Branching Fractions, Absolute Transition Probabilities And J-File Sum Rule For The 4p(5)5p -> 4p(5)5s Transitions Array In Neutral Krypton, Haroon Asghar, Naveed K. Piracha, Raheel Ali, M. Aslam Baig
2020 Faculty Bibliography
We present new results of transition rates for twenty two electric dipole transitions of neutral krypton associated with the 4p55p→4p55 s configurations-based levels covering the wavelength region from 500 to 1000 nm using a krypton filled hollow cathode discharge lamp coupled with a set of four miniature spectrometers. The branching fractions of various dipole allowed transitions were extracted using the observed line intensity ratios, whereas, the absolute values of the transition probabilities were deduced from the measured branching fractions in combination with the known lifetimes of the upper levels. The experimental data are in good agreement with that calculated in …
The Legacies Of Apollo 11, Gregory A. Dilisi, Greg Brown
The Legacies Of Apollo 11, Gregory A. Dilisi, Greg Brown
2019 Faculty Bibliography
No abstract provided.
Factors Affecting The Number And Type Of Student Research Products For Chemistry And Physics Students At Primarily Undergraduate Institutions: A Case Study., Birgit Mellis, Patricia Soto, Chrystal D. Bruce, Graciela Lacueva, Anne Wilson, Rasitha Jayasekare
Factors Affecting The Number And Type Of Student Research Products For Chemistry And Physics Students At Primarily Undergraduate Institutions: A Case Study., Birgit Mellis, Patricia Soto, Chrystal D. Bruce, Graciela Lacueva, Anne Wilson, Rasitha Jayasekare
2018 Faculty Bibliography
For undergraduate students, involvement in authentic research represents scholarship that is consistent with disciplinary quality standards and provides an integrative learning experience. In conjunction with performing research, the communication of the results via presentations or publications is a measure of the level of scientific engagement. The empirical study presented here uses generalized linear mixed models with hierarchical bootstrapping to examine the factors that impact the means of dissemination of undergraduate research results. Focusing on the research experiences in physics and chemistry of undergraduates at four Primarily Undergraduate Institutions (PUIs) from 2004–2013, statistical analysis indicates that the gender of the student …
Thorium And Molten Salt Reactors: Essential Questions For Classroom Discussions, Gregory A. Dilisi, Allison Hirsch*, Meredith Murray*, Richard Rarick
Thorium And Molten Salt Reactors: Essential Questions For Classroom Discussions, Gregory A. Dilisi, Allison Hirsch*, Meredith Murray*, Richard Rarick
2018 Faculty Bibliography
No abstract provided.
Quantitative Analysis Of A Brass Alloy Using Cf- Libs And A Laser Ablation Time-Of-Flight Mass Spectrometer, Nasar Ahmed, M. Abdullah, Rizwan Ahmed, Naveed K. Piracha, M. Aslam Baig
Quantitative Analysis Of A Brass Alloy Using Cf- Libs And A Laser Ablation Time-Of-Flight Mass Spectrometer, Nasar Ahmed, M. Abdullah, Rizwan Ahmed, Naveed K. Piracha, M. Aslam Baig
2018 Faculty Bibliography
We present a quantitative analysis of a brass alloy using laser induced breakdown spectroscopy, energy dispersive x-ray spectroscopy (EDX) and laser ablation time-of-flight mass spectrometry (LA-TOF-MS). The emission lines of copper (Cu I) and zinc (Zn I), and the constituent elements of the brass alloy were used to calculate the plasma parameters. The plasma temperature was calculated from the Boltzmann plot as (10 000 ± 1000) K and the electron number density was determined as (2.0 ± 0.5) × 1017 cm−3 from the Stark-broadened Cu I line as well as using the Saha–Boltzmann equation. The elemental composition was deduced using …
The Hindenburg Disaster: Combining Physics And History In The Laboratory, Gregory A. Dilisi
The Hindenburg Disaster: Combining Physics And History In The Laboratory, Gregory A. Dilisi
2017 Faculty Bibliography
We present the Hindenburg disaster as a case study in the flammability of fabrics. Our goal is to examine the ship’s outer covering and decide whether or not it was the fire’s initial source of fuel. To accomplish this, we piloted a basic vertical flame test with students in an introductory-level undergraduate laboratory. Our test is patterned after the protocol set forth by the American Society for Testing and Materials (ASTM) for determining the flammability of textiles. The case study provides several unique teaching opportunities
The Study Of Znsnn2 For Possible Thermoelectric And Photovoltaic Applications, John Cenker
The Study Of Znsnn2 For Possible Thermoelectric And Photovoltaic Applications, John Cenker
Celebration of Scholarship 2012-2017
In order to replace semiconductors that rely on rare Earth and costly elements, the search for analogous semiconductors formed by plentiful elements began. A recently developed material, ZnSnN2, is the analog to InN. In this project, the Seebeck and Hall effects are measured along with the electrical conductivity. The carrier concentration can then be determined from the Hall coefficient. Using the method of four coefficients and a general theory of these properties, the bounds on effective mass are determined corresponding to the different possible scattering parameters. The results show that samples with carrier concentrations around 6-9Å~10 19 cm-3 exhibit properties …
A Novel Pedestrian Hybrid Beacon Designed For South Belvoir Boulevard, Bradley Doughty
A Novel Pedestrian Hybrid Beacon Designed For South Belvoir Boulevard, Bradley Doughty
Senior Honors Projects
Based upon the recent study by TMS Engineers, Inc. on the section of South Belvoir Boulevard between Washington Boulevard and Carroll Boulevard, a new pedestrian hybrid beacon is designed. Using their recommendations, this traffic signal provides a unique design focused on the safety of pedestrians crossing South Belvoir. This hybrid beacon will minimize pedestrian waiting time, require no interaction from the pedestrian, and clearly articulate to drivers and pedestrians the proper behaviors.
Toward High-Performance Nanostructured Thermoelectric Materials: The Progress Of Bottom-Up Solution Chemistry Approaches, Yixin Zhao, Jeffrey S. Dyck, Clemens Burda
Toward High-Performance Nanostructured Thermoelectric Materials: The Progress Of Bottom-Up Solution Chemistry Approaches, Yixin Zhao, Jeffrey S. Dyck, Clemens Burda
Physics
Significant research effort has recently gone into the synthesis of thermoelectric nanomaterials through different chemical approaches since nanomaterials chemistry became a promising strategy for improving thermoelectric performance. Different thermoelectric nanocrystals, especially PbTe, Bi2Te3 and CoSb3, with various compositions and morphologies have been successfully prepared by solvo/hydrothermal, electrochemical, and ligand-based synthesis methods. Such nanoscale materials show not only substantial reduction in thermal conductivity due to increased phonon scattering at nanoscale grain boundaries and lower densities of phonon states but possibly also an enhancement in thermopower due to electronic quantum size effects. More recently, the notoriously low …
Photoexcitation And Photoionization From The 2p53p[5/2]2,3 Levels In Neon, M. A. Baig, I. A. Bokhari, M. Rafiq, M. A. Kalyar, T. Hussian, Raheel Ali, Naveed K. Piracha
Photoexcitation And Photoionization From The 2p53p[5/2]2,3 Levels In Neon, M. A. Baig, I. A. Bokhari, M. Rafiq, M. A. Kalyar, T. Hussian, Raheel Ali, Naveed K. Piracha
Physics
We present measurements of the excitation spectra from the 2p53p [5/2]3,2 levels in neon using two-step laser excitation and ionization in conjunction with an optogalvanic detection in dc and rf discharge cells. The 2p53p [5/2]3,2 intermediate levels have been approached via the collisionally populated 2p53s [3/2]2 metastable level. The Rydberg series 2p5(2P3/2)nd [7/2]4 (12 ⩽ n ⩽ 44), 2p5(2P3/2)ns [3/2]2 (13 ⩽ n ⩽ 35) and the parity forbidden transitions 2p5(2P3/2)np …
Oscillator Strength Measurements Of The 5s6s 1s0→5snp 1p1 Rydberg Transitions Of Strontium, S. U. Haq, M. A. Kalyar, M. Rafiq, R. Ali, Naveed K. Piracha, M. A. Baig
Oscillator Strength Measurements Of The 5s6s 1s0→5snp 1p1 Rydberg Transitions Of Strontium, S. U. Haq, M. A. Kalyar, M. Rafiq, R. Ali, Naveed K. Piracha, M. A. Baig
Physics
We report the experimentally determined oscillator strengths for the 5s6s 1S0→5snp 1P1 Rydberg transitions of strontium using two-step excitation in conjunction with a thermionic diode ion detector. The absolute photoionization cross section from the 5s6s 1S0 excited state has been determined by adjusting the polarization vector of the ionizing laser beam parallel, perpendicular, and at the magic angle with respect to that of the exciting dye laser. The measured absolute value of the photoionization cross section 0.9±0.2 Mb at the 5s threshold is used to extract the f values of the 5s6s 1 …
Defect Structure Of Sb2−Xcrxte3 Single Crystals, Jeffrey Dyck, J. HoráK, P. C. Quayle, Č. DrašAr, P. LošT’ÁK, C. Uher
Defect Structure Of Sb2−Xcrxte3 Single Crystals, Jeffrey Dyck, J. HoráK, P. C. Quayle, Č. DrašAr, P. LošT’ÁK, C. Uher
Physics
Single crystals of Sb2Te3 doped with Cr (cCr=0–6×1020 cm-3) were prepared by the Bridgman method. The measurements of the Hall coefficient reveal a nonmonotonous dependence of hole concentrations on the Cr content in the crystal. The hole concentration decreases at low content of Cr, while at higher content of Cr it increases again. However, according to magnetic measurements, Cr atoms enter the structure and form uncharged substitutional defects CrSb×, which cannot affect the free carrier concentration directly. The observed dependence can be elucidated by means of a point defect …
Significant Suppression Of Ferromagnetism By Hydrostatic Pressure In The Diluted Magnetic Semiconductor Sb2−Xvxte3 With Xï0.03, Jeffrey Dyck, T J. Mitchell, A J. Luciana, P. C. Quayle, Č. DrašAr, P. LošT’ÁK
Significant Suppression Of Ferromagnetism By Hydrostatic Pressure In The Diluted Magnetic Semiconductor Sb2−Xvxte3 With Xï0.03, Jeffrey Dyck, T J. Mitchell, A J. Luciana, P. C. Quayle, Č. DrašAr, P. LošT’ÁK
Physics
No abstract provided.
Structure Inhomogeneities, Shallow Defects, And Charge Transport In The Series Of Thermoelectric Materials K2bi8−Xsbxse13, Jeffrey S. Dyck, T. Kyratski, E. Hatzikraniotis, K. M. Paraskevopoulos, C. D. Malliakas, C. Uher, M. G. Kanatzidis
Structure Inhomogeneities, Shallow Defects, And Charge Transport In The Series Of Thermoelectric Materials K2bi8−Xsbxse13, Jeffrey S. Dyck, T. Kyratski, E. Hatzikraniotis, K. M. Paraskevopoulos, C. D. Malliakas, C. Uher, M. G. Kanatzidis
Physics
The charge transport properties of the low-dimensional thermoelectric materials K2Bi8-xSbxSe13 (02Bi8-xSbxSe13 was analyzed on the basis of the classical semiconductor theory and discussed in the context of recent band calculations. The results suggest that the K2Bi8-xSbxSe13 materials possess coexisting domains with semimetallic and semiconducting characters whose ratio is influenced by the value of x and by local defects. The extent and relative distribution of these domains control the charge transport properties. Electron diffraction experiments performed on samples of K2 …