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Articles 1741 - 1770 of 33925
Full-Text Articles in Physics
Nonlinear Optical Studies Of Complex Materials, Govinda Kharal
Nonlinear Optical Studies Of Complex Materials, Govinda Kharal
Theses and Dissertations
This dissertation presents an in-depth exploration of nonlinear optical investigations into complex material systems, employing second harmonic generation (SHG) and complementary bulk measurement techniques. The first project focuses on surface symmetries and phase transitions in IrTe2. Using SHG and electrical resistance measurements, we systematically investigate temperature-induced symmetry changes and reveal significant shifts in transition temperatures due to thermal cycling. Comparison with bulk X-ray diffraction confirms that these shifts are surface-related, providing a new interpretation of inconsistencies in reported transition temperatures. Our findings emphasize the effectiveness of SHG in capturing subtle surface phenomena, with future directions involving straincontrolled studies to manipulate …
Measurement Of Single Differential Cross Sections, Polarization Observables, And Beam-Spin Asymmetry In Charged Two-Pion Electroproduction Off The Proton, Christopher Andrew Mclauchlin
Measurement Of Single Differential Cross Sections, Polarization Observables, And Beam-Spin Asymmetry In Charged Two-Pion Electroproduction Off The Proton, Christopher Andrew Mclauchlin
Theses and Dissertations
Emergent phenomena are described as such due to functional differences in paradigms based on observation scale, one of the most fundamental being the emergence of hadronic structure from bare quarks and gluons, as dictated by the strong interaction. Measurement of charged two-pion electroproduction off the proton with CLAS in run group E1-6 and the extraction of single differential cross sections, polarization observables, and beam-spin asymmetries was performed as a necessary step in illuminating the length scale currently dark to Quantum Chromodynamics within the structure of the proton. Understanding the scale-dependent nature of this hadronic structure is integral to understanding nature …
Suppression Of Dynamic Aeroelastic Response Of A Semispan Wing Using Traditional And Distributed Sensing, James Ramey
Suppression Of Dynamic Aeroelastic Response Of A Semispan Wing Using Traditional And Distributed Sensing, James Ramey
Mechanical & Aerospace Engineering Theses & Dissertations
Characterization and management of aeroelastic effects are a vital part of aircraft design. Mitigation of these effects often includes control systems to suppress the vibrations. Control systems are constantly being developed and improved, with one such avenue of development being new sensing systems that can increase the information fed into the controller. Fiber Optic Strain Sensing (FOSS) technology is one such system that utilizes Fiber Bragg Gratings (FBGs) on a fiber optic cable to sense the strain on structural elements. This system has promise as a high-density feedback device, and the maturation of the technology has allowed assessment of its …
Does It Stick? A Longitudinal Study Of Introductory Physics For Life Sciences At A Small College, Benjamin D. Geller , '01, Catherine Hirshfeld Crouch
Does It Stick? A Longitudinal Study Of Introductory Physics For Life Sciences At A Small College, Benjamin D. Geller , '01, Catherine Hirshfeld Crouch
Physics & Astronomy Faculty Works
At Swarthmore College, we began developing an Introductory Physics for Life Sciences (IPLS) course nearly 20 years ago. The electricity, magnetism and optics semester was launched in 2008 and both semesters have been offered regularly since Fall 2015. Two primary goals of this curriculum are (1) to prepare students to effectively use physical models and quantitative reasoning in biological and biomedical contexts, and (2) for students to come to view physics as relevant to the life sciences. To evaluate whether these goals are achieved, we conducted a longitudinal interdisciplinary study assessing students' abilities to use what they learned from IPLS …
Comparative Analysis In The Effectiveness Of Real Vs. Virtual Labs In Enhancing Students’ Conceptual Understanding Of Archimedes’ Principle, Judeanto Edy, Sutopo Sutopo, Edi Supriana
Comparative Analysis In The Effectiveness Of Real Vs. Virtual Labs In Enhancing Students’ Conceptual Understanding Of Archimedes’ Principle, Judeanto Edy, Sutopo Sutopo, Edi Supriana
Jurnal Pendidikan Sains
This research aimed to investigate the effectiveness of virtual laboratories compared to real laboratories in improving students’ conceptual understanding of Archimedes’ principle. A quantitative approach was employed using a pretest-posttest design. The measurement instrument used in this study was a concept mastery test, consisting of 15 multiple-choice questions. Data were analyzed using an independent sample T-test. The research involved students from two XI IPA classes, each consisting of 33 students. The findings indicated that both virtual and real laboratories in the learning process could enhance students’ conceptual understanding. The study concluded that there was no significant difference between the virtual …
Exploration Of Students’ Scientific Argumentation Skills On Static Fluid Topics, Trio Junira Fernando, Parno Parno, Markus Diantoro
Exploration Of Students’ Scientific Argumentation Skills On Static Fluid Topics, Trio Junira Fernando, Parno Parno, Markus Diantoro
Jurnal Pendidikan Sains
The weakness in students’ scientific argumentation, particularly in providing evidence-based arguments, has become a significant concern in education. This study aims to assess students’ scientific argumentation skills specifically on the topic of static fluids. The survey was conducted with 78 twelfth-grade students from private high schools in East Java, Indonesia, who had previously studied this topic. A scientific argumentation test instrument, consisting of an essay format with five questions, was employed to collect data. The data were analyzed using descriptive statistics, followed by a classification based on static fluid subtopics and the level of scientific argumentation skill. The results indicated …
Impact Of Problem-Based Learning Integrated With Blended Learning On Students’ Collaborative Skills, Angel Regina, Yustina Febblina Daryanes, Riki Apriyandi Putra
Impact Of Problem-Based Learning Integrated With Blended Learning On Students’ Collaborative Skills, Angel Regina, Yustina Febblina Daryanes, Riki Apriyandi Putra
Jurnal Pendidikan Sains
This study investigates the impact of implementing a Problem-Based Learning (PBL) model integrated with Blended Learning on enhancing students’ collaborative abilities. Conducted in class XI of SMA Negeri Plus Riau Province during the 2021/2022 academic year, the research utilized a control group design to compare the collaborative skills of students in an experimental class, which employed the PBL model, with those in a control class. The study assessed four key indicators of collaborative ability: working productively, valuing opinions, compromising, and sharing responsibility. The findings revealed that students in the experimental class showed significant improvements in all four indicators compared to …
Influencing Factors Of Competency Achievement In Fiber Optic Installation Engineering: A Study On Vocational School Graduates In Indonesia, Pangadongan Elfin Pujianto, Djoko Kustono, Hakkun Elmunsyah
Influencing Factors Of Competency Achievement In Fiber Optic Installation Engineering: A Study On Vocational School Graduates In Indonesia, Pangadongan Elfin Pujianto, Djoko Kustono, Hakkun Elmunsyah
Jurnal Pendidikan Sains
This study investigates the factors influencing the achievement of competencies in the field of Fiber Optic Installation Engineering (TIFO) among vocational school graduates in Indonesia and their subsequent performance in the workforce. Utilizing a quantitative approach, the research examines the relationship between several key variables, including national examination scores, quality of infrastructure, teaching competence, and telecommunication systems subject scores. Path analysis structural equation modeling was employed to determine the direct and indirect effects of these variables on TIFO competency achievement and graduates’ performance. The findings reveal that the quality of infrastructure is the most significant contributor to competency achievement, accounting …
Development Of E-Modules Based On Pjbl-Steam And Virtual Simulation Media On Work And Energy Topic As An Effort To Improve Students’ Critical Thinking Skills, Farah Rafidah, Parno Parno, Nasikhudin Nasikhudin, Marlina Ali
Development Of E-Modules Based On Pjbl-Steam And Virtual Simulation Media On Work And Energy Topic As An Effort To Improve Students’ Critical Thinking Skills, Farah Rafidah, Parno Parno, Nasikhudin Nasikhudin, Marlina Ali
Jurnal Pendidikan Sains
Work and energy are fundamental topics in physics. However, enhancing students’ critical thinking skills in these areas remains a challenge. This research aimed to develop and assess the validity and readability of e-modules designed with PjBL-STEAM and virtual simulation media to address this issue. The development process followed a 4D model, and the resulting e-modules were evaluated as strongly valid category. The validation tests yielded percentage scores of 91.6% for media, 89.3% for content, and 88.0% for lesson plans. Additionally, the readability test achieved a score of 84.6%, indicating a excellent level of comprehensibility. These findings suggest that the e-modules …
In Vitro Profiling Of The Antiviral Peptide Tat-I24, Theodhora Ziu, Ezgi Sambur, Zsolt Ruzsics, Hartmut Hengel, Reingard Grabherr, Siegfried Hofinger, Hanna Harant
In Vitro Profiling Of The Antiviral Peptide Tat-I24, Theodhora Ziu, Ezgi Sambur, Zsolt Ruzsics, Hartmut Hengel, Reingard Grabherr, Siegfried Hofinger, Hanna Harant
Michigan Tech Publications
The synthetic peptide TAT-I24 (GRKKRRQRRRPPQCLAFYACFC) exerts antiviral activity against several double-stranded (ds) DNA viruses, including herpes simplex viruses, cytomegalovirus, some adenoviruses, vaccinia virus and SV40 polyomavirus. In the present study, in vitro profiling of this peptide was performed with the aim of characterizing and improving its properties for further development. As TAT-I24 contains three free cysteine residues, a potential disadvantageous feature, peptide variants with replacements or deletions of specific residues were generated and tested in various cell systems and by biochemical analyses. Some cysteine replacements had no impact on the antiviral activity, such as the deletion of cysteine 14, which …
First-Principles Calculations Of Thermoelectric Properties Of Fe-Based Full- Heusler Fe2cusi, Ai Nurlaela, Dwi Nanto, Anugrah Azhar, Elvan Yuniarti, Tony Kristiantoro, Dedi Dedi
First-Principles Calculations Of Thermoelectric Properties Of Fe-Based Full- Heusler Fe2cusi, Ai Nurlaela, Dwi Nanto, Anugrah Azhar, Elvan Yuniarti, Tony Kristiantoro, Dedi Dedi
Makara Journal of Science
A first-principle study using density functional theory (DFT) and Boltzmann transport was conducted to evaluate the thermoelectric (TE) properties of an Fe-based full-Heusler alloy. The compound studied is Fe2CuSi with a Cu2MnAl-type structure. The electronic properties of Fe2CuSi were obtained using DFT calculations by running the Quantum ESPRESSO (QE) package. By contrast, TE properties, including electron thermal conductivity, electric conductivity, and Seebeck coefficient, were computed using a semi-empirical Boltzmann transport model solved through the BoltzTraP software at 50–1,500 K temperature range. The spin-orbit coupling effect on these properties was also evaluated, demonstrating notable effects …
Optimal Radar Ranging Pulse To Resolve Two Reflectors, Andrew N. Jordan, John C. Howell, Achim Kempf, Shunxing Zhang, Derek White
Optimal Radar Ranging Pulse To Resolve Two Reflectors, Andrew N. Jordan, John C. Howell, Achim Kempf, Shunxing Zhang, Derek White
Mathematics, Physics, and Computer Science Faculty Articles and Research
Previous work established fundamental bounds on subwavelength resolution for the radar range resolution problem, called superradar [Phys. Rev. Appl. 20, 064046 (2023)]. In this work, we identify the optimal waveforms for distinguishing the range resolution between two reflectors of identical strength, leveraging results in quantum metrology. We discuss both the unnormalized optimal waveform as well as the best square-integrable pulse and their variants. Using orthogonal function theory, we give an explicit algorithm to optimize the wave pulse in finite time to have the best performance. We also explore range resolution estimation with unnormalized waveforms with multiparameter methods to …
Veritas And Hawc Observations Of Unidentified Source Lhaaso J2108+5157, Sajan Kumar, Michael Martin, Xiaojie Wang, A. Acharyya, C. B. Adams, A. Archer, P. Bangale, J. T. Bartkoske, P. Batista, W. Benbow, J. L. Christiansen, A. J. Chromey, A. Duerr, M. Errando, Q. Feng, G. M. Foote, L. Fortson, A. Furniss
Veritas And Hawc Observations Of Unidentified Source Lhaaso J2108+5157, Sajan Kumar, Michael Martin, Xiaojie Wang, A. Acharyya, C. B. Adams, A. Archer, P. Bangale, J. T. Bartkoske, P. Batista, W. Benbow, J. L. Christiansen, A. J. Chromey, A. Duerr, M. Errando, Q. Feng, G. M. Foote, L. Fortson, A. Furniss
Physics Faculty Research & Creative Works
Understanding the complete nature of Galactic sources that accelerate cosmic rays up to 1015 eV energy (Galactic PeVatrons) is still an unsolved problem in high-energy astrophysics. Although supernova remnants have long been considered as the best candidates for Galactic PeVatrons, a clear association of SNRs with PeVatrons needs further exploration. Recently, the LHAASO collaboration published its first catalog of 90 very high energy (VHE) gamma-ray sources, and a few of them have no obvious counterparts at other wavelengths. Here, we will present morphology and spectral analysis of one such unassociated source LHAASO J2108+5157 using VERITAS and HAWC data.
Searching For Tev Emission From Lhaaso J0341+5258 With Veritas And Hawc, P. Bangale, X. Wang, A. Acharyya, C. B. Adams, A. Archer, J. T. Bartkoske, P. Batista, W. Benbow, J. L. Christiansen, A. J. Chromey, A. Duerr, M. Errando, Q. Feng, G. M. Foote, L. Fortson, A. Furniss, W. Hanlon, O. Hervet
Searching For Tev Emission From Lhaaso J0341+5258 With Veritas And Hawc, P. Bangale, X. Wang, A. Acharyya, C. B. Adams, A. Archer, J. T. Bartkoske, P. Batista, W. Benbow, J. L. Christiansen, A. J. Chromey, A. Duerr, M. Errando, Q. Feng, G. M. Foote, L. Fortson, A. Furniss, W. Hanlon, O. Hervet
Physics Faculty Research & Creative Works
Galactic PeVatrons are astrophysical sources accelerating particles up to a few PeV (∼1015 eV) energies. The primary signature of 100 TeV γ rays may come from PeV protons or multihundred TeV (not PeV) electrons. The search for PeVatrons has been one of the key science topics for VERITAS and HAWC. In 2021, LHAASO detected 14 steady γ-ray sources with photon energies above 100 TeV, up to 1.4 PeV. This provides a clear list of PeVatron candidates for further study with VERITAS and HAWC. Most of these sources contain possible source associations, such as supernova remnants, pulsar wind nebulae, and …
Recent Results From The High Altitude Water Cherenkov Observatory, Miguel Mostafá, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, E. Belmont-Moreno, K. S. Caballero-Mora, T. Capistrán, S. Yun-Cárcamo, A. Carramiñana, F. Carreón, U. Cotti, J. Cotzomi, S. Coutiño De León, E. De La Fuente, D. Depaoli, C. De Leon, R. Diaz Hernandez, J. C. Diaz-Velez, B. L. Dingus, M. Durocher, M. A. Duvernois, K. Engel, C. Espinoza, K. L. Fan, K. Fang, N. I. Fraija, J. A. Garcia-Gonzalez, F. Garfias, H. Goksu, M. M. Gonzalez, J. A. Goodman, S. Groetsch, J. P. Harding, S. Hernandez, I. Herzog, J. Hinton, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, V. Joshi, S. Kaufmann, D. Kieda, A. Lara, J. Lee, W. H. Lee, H. Leon Vargas, J. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, J. Martinez-Castro, J. A. J. Matthews, P. Miranda-Romagnoli, J. Montes, J. A. Morales, M. Mostaafa, L. Nellen, M. U. Nisa, R. Noriega-Papaqui, L. Olivera-Nieto, N. Omodei, Y. Perez Araujo, E. G. Perez-Perez, A. Pratts, C. D. Rho, D. Rosa-Gonzalez, E. Ruiz-Velasco, H. Salazar, D. Salazar-Gallegos, A. Sandoval, M. Schneider, G. Schwefer, J. Serna-Franco, A. J. Smith, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, R. Torres-Escobedo, R. Turner, F. Urena-Mena, E. Varela, L. Villasenor, Xiaojie Wang, I. J. Watson, F. Werner, K. Whitaker, E. Willox, H. Wu, H. Zhou
Recent Results From The High Altitude Water Cherenkov Observatory, Miguel Mostafá, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, E. Belmont-Moreno, K. S. Caballero-Mora, T. Capistrán, S. Yun-Cárcamo, A. Carramiñana, F. Carreón, U. Cotti, J. Cotzomi, S. Coutiño De León, E. De La Fuente, D. Depaoli, C. De Leon, R. Diaz Hernandez, J. C. Diaz-Velez, B. L. Dingus, M. Durocher, M. A. Duvernois, K. Engel, C. Espinoza, K. L. Fan, K. Fang, N. I. Fraija, J. A. Garcia-Gonzalez, F. Garfias, H. Goksu, M. M. Gonzalez, J. A. Goodman, S. Groetsch, J. P. Harding, S. Hernandez, I. Herzog, J. Hinton, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, V. Joshi, S. Kaufmann, D. Kieda, A. Lara, J. Lee, W. H. Lee, H. Leon Vargas, J. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, J. Martinez-Castro, J. A. J. Matthews, P. Miranda-Romagnoli, J. Montes, J. A. Morales, M. Mostaafa, L. Nellen, M. U. Nisa, R. Noriega-Papaqui, L. Olivera-Nieto, N. Omodei, Y. Perez Araujo, E. G. Perez-Perez, A. Pratts, C. D. Rho, D. Rosa-Gonzalez, E. Ruiz-Velasco, H. Salazar, D. Salazar-Gallegos, A. Sandoval, M. Schneider, G. Schwefer, J. Serna-Franco, A. J. Smith, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, R. Torres-Escobedo, R. Turner, F. Urena-Mena, E. Varela, L. Villasenor, Xiaojie Wang, I. J. Watson, F. Werner, K. Whitaker, E. Willox, H. Wu, H. Zhou
Physics Faculty Research & Creative Works
High energy γ-ray observations are an essential probe of cosmic-ray acceleration mechanisms. The detection of the highest energy γ rays and the shortest timescales of variability are the key to improve our understanding of the acceleration processes and the environment of the cosmic accelerators. The High-Altitude Water Cherenkov (HAWC) experiment is a large field-of-view, multi-TeV, γ-ray observatory continuously operating at 4100 m a.s.l. since March 2015. The HAWC observatory has an order of magnitude better sensitivity, angular resolution, and background rejection than the previous generation of water-Cherenkov arrays. The improved performance allows us to discover new TeV sources, to detect …
A Preliminary Look At The Construction Of The 4hwc Very High And Ultra High Energy Source Catalog Using The Multi Source Fit Method, Samuel Groetsch, Samuel Groetsch, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, E. Belmont-Moreno, T. Capistrán, Y. Cárcamo, A. Carramiñana, F. Carreón, U. Cotti, J. Cotzomi, S. Coutiño De León, E. De La Fuente, D. Depaoli, C. De Leon, R. Diaz Hernandez, J. C. Diaz-Velez, B. L. Dingus, M. Durocher, M. A. Duvernois, K. Engel, C. Espinoza, K. L. Fan, K. Fang, N. I. Fraija, J. A. Garcia-Gonzalez, F. Garfias, H. Goksu, M. M. Gonzalez, J. A. Goodman, S. Groetsch, J. P. Harding, S. Hernandez, I. Herzog, J. Hinton, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, V. Joshi, S. Kaufmann, D. Kieda, A. Lara, J. Lee, W. H. Lee, H. Leon Vargas, J. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, J. Martinez-Castro, J. A. J. Matthews, P. Miranda-Romagnoli, J. Montes, J. A. Morales-Soto, M. Mostafa, L. Nellen, M. U. Nisa, R. Noreiga-Papaqui, L. Olivera-Nieto, N. Omodei, Y. Perez Araujo, E. G. Perez-Perez, A. Pratts, C. D. Rho, D. Rosa-Gonzalez, E. Ruiz-Velasco, H. Salazar, D. Salazar-Gallegos, A. Sandoval, M. Schneider, G. Schwefer, J. Serna-Franco, A. J. Smith, Y. Son, R. W. Sprimger, O. Tibolla, K. Tollefson, I. Torrees, R. Torres-Escobedo, R. Turner, F. Urena-Mena, E. Varela, L. Villasenor, Xiaojie Wang, I. J. Watson, F. Werner, K. Whitaker, E. Willox, H. Wu, H. Zhou
A Preliminary Look At The Construction Of The 4hwc Very High And Ultra High Energy Source Catalog Using The Multi Source Fit Method, Samuel Groetsch, Samuel Groetsch, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, E. Belmont-Moreno, T. Capistrán, Y. Cárcamo, A. Carramiñana, F. Carreón, U. Cotti, J. Cotzomi, S. Coutiño De León, E. De La Fuente, D. Depaoli, C. De Leon, R. Diaz Hernandez, J. C. Diaz-Velez, B. L. Dingus, M. Durocher, M. A. Duvernois, K. Engel, C. Espinoza, K. L. Fan, K. Fang, N. I. Fraija, J. A. Garcia-Gonzalez, F. Garfias, H. Goksu, M. M. Gonzalez, J. A. Goodman, S. Groetsch, J. P. Harding, S. Hernandez, I. Herzog, J. Hinton, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, V. Joshi, S. Kaufmann, D. Kieda, A. Lara, J. Lee, W. H. Lee, H. Leon Vargas, J. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, J. Martinez-Castro, J. A. J. Matthews, P. Miranda-Romagnoli, J. Montes, J. A. Morales-Soto, M. Mostafa, L. Nellen, M. U. Nisa, R. Noreiga-Papaqui, L. Olivera-Nieto, N. Omodei, Y. Perez Araujo, E. G. Perez-Perez, A. Pratts, C. D. Rho, D. Rosa-Gonzalez, E. Ruiz-Velasco, H. Salazar, D. Salazar-Gallegos, A. Sandoval, M. Schneider, G. Schwefer, J. Serna-Franco, A. J. Smith, Y. Son, R. W. Sprimger, O. Tibolla, K. Tollefson, I. Torrees, R. Torres-Escobedo, R. Turner, F. Urena-Mena, E. Varela, L. Villasenor, Xiaojie Wang, I. J. Watson, F. Werner, K. Whitaker, E. Willox, H. Wu, H. Zhou
Physics Faculty Research & Creative Works
The High-Altitude Water Cherenkov (HAWC) observatory is highly suitable for large-scale survey work. The high duty time (95%), large instantaneous FoV (2 sr), and sensitivity over the 300 GeV to more than 100 TeV energy range make it ideal for creating a catalog of very high energy (VHE) sources. Over the lifetime of the HAWC observatory, 4 catalogs have been produced 3 of which were constructed utilizing the full HAWC energy range while another used a restricted (>56 TeV) range. This talk will focus on the status of the planned 4HWC (full energy range) catalog including the newly developed …
Revealing Ultra-High-Energy Gamma-Ray Emission From The Ehwc J1825-134 Region With Hawc, Dezhi Huang, Dezhi Huang, Hazal Goksu, Hazal Goksu, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, E. Belmont-Moreno, T. Capistrán, Y. Cárcamo, A. Carramiñana, F. Carreón, U. Cotti, J. Cotzomi, S. Coutino De Leon, E. De La Fuente, D. Depaoli, C. De Leon, R. Diaz Hernandez, J. C. Diaz-Velez, B. L. Dingus, M. Durocher, M. A. Duvernois, K. Engel, C. Espinoza, K. L. Fan, K. Fang, N. I. Fraija, J. A. Garcia-Gonzalez, F. Garfias, H. Goksu, M. M. Gonzalez, J. A. Goodman, S. Groetsch, J. P. Harding, S. Hernandez, I. Herzog, J. Hinton, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, V. Joshi, S. Kaufmann, D. Kieda, A. Lara, J. Lee, W. H. Lee, H. Leon Vargas, J. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, J. Martinez-Castro, J. A. J. Matthews, P. Miranda-Romagnoli, J. Montes, J. A. Morales-Soto, M. Mostafa, L. Nellen, M. U. Nisa, R. Noriega-Papaqui, L. Olivera-Nieto, N. Omodei, Y. Perez Araujo, E. G. Perez-Perez, A. Pratts, C. D. Rho, D. Rosa-Gonzalez, E. Ruiz-Velasco, H. Salazar, D. Salazar-Gallegos, A. Sandoval, M. Schneider, G. Schwefer, J. Serna-Franco, A. J. Smith, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, R. Torres-Escobedo, R. Turner, F. Urena-Mena, L. Villasenor, Xiaojie Wang, I. J. Watson, F. Werner, K. Whitaker, E. Willox, H. Wu, H. Zhou
Revealing Ultra-High-Energy Gamma-Ray Emission From The Ehwc J1825-134 Region With Hawc, Dezhi Huang, Dezhi Huang, Hazal Goksu, Hazal Goksu, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, E. Belmont-Moreno, T. Capistrán, Y. Cárcamo, A. Carramiñana, F. Carreón, U. Cotti, J. Cotzomi, S. Coutino De Leon, E. De La Fuente, D. Depaoli, C. De Leon, R. Diaz Hernandez, J. C. Diaz-Velez, B. L. Dingus, M. Durocher, M. A. Duvernois, K. Engel, C. Espinoza, K. L. Fan, K. Fang, N. I. Fraija, J. A. Garcia-Gonzalez, F. Garfias, H. Goksu, M. M. Gonzalez, J. A. Goodman, S. Groetsch, J. P. Harding, S. Hernandez, I. Herzog, J. Hinton, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, V. Joshi, S. Kaufmann, D. Kieda, A. Lara, J. Lee, W. H. Lee, H. Leon Vargas, J. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, J. Martinez-Castro, J. A. J. Matthews, P. Miranda-Romagnoli, J. Montes, J. A. Morales-Soto, M. Mostafa, L. Nellen, M. U. Nisa, R. Noriega-Papaqui, L. Olivera-Nieto, N. Omodei, Y. Perez Araujo, E. G. Perez-Perez, A. Pratts, C. D. Rho, D. Rosa-Gonzalez, E. Ruiz-Velasco, H. Salazar, D. Salazar-Gallegos, A. Sandoval, M. Schneider, G. Schwefer, J. Serna-Franco, A. J. Smith, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, R. Torres-Escobedo, R. Turner, F. Urena-Mena, L. Villasenor, Xiaojie Wang, I. J. Watson, F. Werner, K. Whitaker, E. Willox, H. Wu, H. Zhou
Physics Faculty Research & Creative Works
Located in the southern field of view of the High-Altitude Water Cherenkov (HAWC) observatory, the eHWC J1825-134 region is one of the most complicated gamma-ray emission sites on the galactic plane. The region contains a few PeVatron candidates that can accelerate particles up to PeV energies. Disentangling the overlapping gamma-ray emission and associating it with accelerators is crucial to understand the mechanism of cosmic-ray acceleration and gamma-ray production near the accelerators. In this talk, I will present each of the gamma-ray sources resolved in this region using 1910 days of HAWC data, including their spectra. Also, we have studied their …
Hawc Observations Of Microquasars As Powerful Particle Accelerators, Xiaojie Wang, Xiaojie Wang, Dezhi Huang, Dezhi Huang, Chang Dong Rho, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, E. Belmont-Moreno, T. Capistrán, Y. Cárcamo, A. Carramiñana, F. Carreón
Hawc Observations Of Microquasars As Powerful Particle Accelerators, Xiaojie Wang, Xiaojie Wang, Dezhi Huang, Dezhi Huang, Chang Dong Rho, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, E. Belmont-Moreno, T. Capistrán, Y. Cárcamo, A. Carramiñana, F. Carreón
Physics Faculty Research & Creative Works
Micro quasars are one of the classes of powerful Galactic particle accelerators that emit gamma rays beyond multi-TeV energies. Recently, gamma-ray emission above tens of TeV has been detected from some of these objects. The High-Altitude Water Cherenkov (HAWC) observatory has previously reported gamma-ray emission with a median energy of 25 TeV from the micro quasar SS 433, suggesting that gamma-ray binaries can accelerate particles to above 100 TeV inside the jets. With 2,321 days of data and better reconstruction algorithms, the HAWC observatory detected emissions above 20 TeV from two other binaries, V4641 Sagittarii and LS 5039. The V4641 …
The First Joint Observation By Kagra With Geo 600, N. Uchikata, R. Abbott, H. Abe, Teviet Creighton, Mario C. Diaz, Francisco Llamas, Soma Mukherjee, Gaukhar Nurbek, Volker Quetschke, Wenhui Wang
The First Joint Observation By Kagra With Geo 600, N. Uchikata, R. Abbott, H. Abe, Teviet Creighton, Mario C. Diaz, Francisco Llamas, Soma Mukherjee, Gaukhar Nurbek, Volker Quetschke, Wenhui Wang
Physics & Astronomy Faculty Publications
KAGRA conducted its first joint observation with GEO 600 for two weeks in April, 2020. We performed two types of all-sky searches and two searches dedicated to gravitational wave signals associated with gamma-ray burst events observed during the run. We did not detect any gravitational wave signals, which was expected given the sensitivity of both detectors at that time. However, we did confirm that several search pipelines used in the LIGO-Virgo-KAGRA collaborations worked effectively on the KAGRA data. In this presentation we will report on the data quality of detectors and the search results.
Novel High-Strength And High-Temperature Resistant Composite Material For In-Space Optical Mining Applications: Modeling, Design, And Simulation At The Polymer And Atomic/Molecular Levels., Haradou Sare, Dongmei Dong
Novel High-Strength And High-Temperature Resistant Composite Material For In-Space Optical Mining Applications: Modeling, Design, And Simulation At The Polymer And Atomic/Molecular Levels., Haradou Sare, Dongmei Dong
College of Science & Mathematics Departmental Research
This study explores the modeling, design, simulation, and testing of a new composite material designed for high-strength and high-temperature resistance in in-space optical mining, examining its properties at both the polymer and atomic/molecular levels. At the polymer level, the investigation includes mechanical and thermal performance analyses using COMSOL Multiphysics 6.1, employing layerwise theory, equivalent single layer (ESL) theory, and a multiple-model approach for mechanical modeling, alongside virtual thermal experiments simulating laser heating. Experimentally, porous Polyaniline (PANI) films are fabricated via electrochemical polymerization, with variations in voltage and deposition time, to study their morphology, optical performance, and electrochemical behavior. At the …
Design, Characterization, And Simulation Of A 2d Dual-Rail Quantum Processor, Diego Barrutia
Design, Characterization, And Simulation Of A 2d Dual-Rail Quantum Processor, Diego Barrutia
Dartmouth College Master’s Theses
Bosonic systems, such as three-dimensional (3D) λ/4 coaxial cavities and two-dimensional (2D) λ/2 coplanar waveguide (CPW) resonators, are quantum harmonic oscillators that encode information in phase space, offering a hardware-efficient route toward quantum error correction and simulation in superconducting circuits. In this thesis, we present the design, characterization, and simulation of a dual-rail processor constructed with a 2D λ/2 coplanar waveguide resonators, demonstrating a percent error between experimental and analytical results within a range of 3.31% - 13.16%. The analytical results exhibit high precision but lower accuracy relative to experimental measurements. By integrating both closed-source and open-source software tools, we …
The Jwst-Suspense Ultradeep Spectroscopic Program: Survey Overview And Star Formation Histories Of Quiescent Galaxies At 1 < Z < 3, Martje Slob, Mariska Kriek, Aliza G. Beverage, Katherine A. Suess, Guillermo Barro, Rachel Bezanson, Gabriel Brammer, Chloe M. Cheng, Charlie Conroy, Anna De Graaff, Natascha M. Förster Schreiber, Marijn Franx, Brian Lorenz, Pavel E. Mancera Piña, Danilo Marchesini, Adam Muzzin, Andrew B. Newman, Sedona H. Price, Alice E. Shapley, Mauro Stefanon, Pieter Van Dokkum
The Jwst-Suspense Ultradeep Spectroscopic Program: Survey Overview And Star Formation Histories Of Quiescent Galaxies At 1 < Z < 3, Martje Slob, Mariska Kriek, Aliza G. Beverage, Katherine A. Suess, Guillermo Barro, Rachel Bezanson, Gabriel Brammer, Chloe M. Cheng, Charlie Conroy, Anna De Graaff, Natascha M. Förster Schreiber, Marijn Franx, Brian Lorenz, Pavel E. Mancera Piña, Danilo Marchesini, Adam Muzzin, Andrew B. Newman, Sedona H. Price, Alice E. Shapley, Mauro Stefanon, Pieter Van Dokkum
Pacific Faculty Work
We present an overview and first results from the Spectroscopic Ultradeep Survey Probing Extragalactic Near-infrared Stellar Emission (SUSPENSE), executed with NIRSpec on JWST. The primary goal of the SUSPENSE program is to characterize the stellar, chemical, and kinematic properties of massive quiescent galaxies at cosmic noon. In a single deep NIRSpec/MSA configuration, we target 20 distant quiescent galaxy candidates (z = 1-3, H AB ≤ 23), as well as 53 star-forming galaxies at z = 1-4. With 16 hr of integration and the G140M-F100LP dispersion-filter combination, we observe numerous Balmer and metal absorption lines for all quiescent candidates. We derive …
Search For Photons Above 1018 Ev By Simultaneously Measuring The Atmospheric Depth And The Muon Content Of Air Showers At The Pierre Auger Observatory, A. Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte, K. Almeida Cheminant, A. Almela, B. Fick, N. Nguyen, D. Nitz
Search For Photons Above 1018 Ev By Simultaneously Measuring The Atmospheric Depth And The Muon Content Of Air Showers At The Pierre Auger Observatory, A. Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte, K. Almeida Cheminant, A. Almela, B. Fick, N. Nguyen, D. Nitz
Michigan Tech Publications
The Pierre Auger Observatory is the most sensitive instrument to detect photons with energies above 1017 eV. It measures extensive air showers generated by ultrahigh energy cosmic rays using a hybrid technique that exploits the combination of a fluorescence detector with a ground array of particle detectors. The signatures of a photon-induced air shower are a larger atmospheric depth of the shower maximum (Xmax) and a steeper lateral distribution function, along with a lower number of muons with respect to the bulk of hadron-induced cascades. In this work, a new analysis technique in the energy interval between 1 and 30 …
Settling Of Two Rigidly Connected Spheres, Z. Maches, Morgane Houssais
Settling Of Two Rigidly Connected Spheres, Z. Maches, Morgane Houssais
Physics
Laboratory experiments and particle-resolved simulations are employed to investigate the settling dynamics of a pair of rigidly connected spherical particles of unequal size. They yield a detailed picture of the transient evolution and the terminal values of the aggregate's orientation angle and its settling and drift velocities as functions of the aspect ratio and the Galileo number, which denotes the ratio of buoyancy and viscous forces acting on the aggregate. At low to moderate values of, the aggregate's orientation and velocity converge to their terminal values monotonically, whereas for higher -values the aggregate tends to undergo a more complex motion. …
China Spallation Neutron Source And Southern Advance Light Source, Hesheng Chen
China Spallation Neutron Source And Southern Advance Light Source, Hesheng Chen
Bulletin of Chinese Academy of Sciences (Chinese Version)
China Spallation Neutron Source provides a large multidisciplinary platform for advanced neutron scattering research and application for cutting-edge research in basic science and many fields of the national demands. Its comprehensive performance is in the international advanced level, and has significantly improved the scientific and technological capability and innovation abilities in related fields. The successful construction of China Spallation Neutron Source has greatly promoted the development of the national large science and technology infrastructure in the Guangdong-Hong Kong-Macao Greater Bay Area, and provides important support to the comprehensive national science center in the Greater Bay Area. The synchrotron radiation light …
Observation Of The Galactic Center Pevatron Beyond 100 Tev With Hawc, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, S. Groetsch, P. Hüntemeyer, M. Najafi, R. Turner, X. Wang, Et. Al
Observation Of The Galactic Center Pevatron Beyond 100 Tev With Hawc, A. Albert, R. Alfaro, C. Alvarez, A. Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas, S. Groetsch, P. Hüntemeyer, M. Najafi, R. Turner, X. Wang, Et. Al
Michigan Tech Publications
We report an observation of ultrahigh-energy (UHE) gamma rays from the Galactic center (GC) region, using 7 yr of data collected by the High-Altitude Water Cherenkov (HAWC) Observatory. The HAWC data are best described as a point-like source (HAWC J1746-2856) with a power-law spectrum ( d N / d E = ϕ E / 26 TeV γ ), where γ = −2.88 ± 0.15stat − 0.1sys and ϕ = 1.5 × 10−15 (TeV cm2 s)−1 ± 0.3 stat − 0.13 sys + 0.08 sys extending from 6 to 114 TeV. We find no evidence of a spectral cutoff up to …
Synthesis Of Zno: Zro2 Nanocomposites Using Green Method For Medical Applications, Mohammed J. Tuama, Maysoon F. Alias
Synthesis Of Zno: Zro2 Nanocomposites Using Green Method For Medical Applications, Mohammed J. Tuama, Maysoon F. Alias
Karbala International Journal of Modern Science
These days, nanocomposites are very popular, especially in medical applications. The spread of diseases in general, and those caused by microbes and cancerous diseases in particular, and the increased resistance of these diseases to antibiotics, have led to the need for the rapid, low-cost, and environmentally friendly production of nanocomposites. To create the chemical G-ZnO: ZrO2 and S-ZnO: ZrO2 (green technique), two different plant extracts were utilized: Z. officinal and S. aromaticum. The effective synthesis and acceptable properties features of the nanoparticles were confirmed using characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared (FTIR) , diffuse reflectance spectroscopy …
Search For Core Collapse Supernovae Signals In Ligo’S Third Observation Run Using A Network Of Gravitational Wave Detectors Integrated With A Multiclass Convolutional Neural Network, Shahrear Khan Faisal, Gaukhar Nurbek, Michael Benjamin, Bhawana Sedhai, Soma Mukherjee
Search For Core Collapse Supernovae Signals In Ligo’S Third Observation Run Using A Network Of Gravitational Wave Detectors Integrated With A Multiclass Convolutional Neural Network, Shahrear Khan Faisal, Gaukhar Nurbek, Michael Benjamin, Bhawana Sedhai, Soma Mukherjee
Physics & Astronomy Faculty Publications
In the existing body of literature, numerous waveforms of core collapse supernovae (CCSN) have emerged from extensive simulations conducted in high-performance computing facilities globally. These waveforms exhibit distinct characteristics related to their explosion mechanisms, influenced by parameters such as progenitor mass, angular momentum, gravitational wave energy, peak frequency, duration, and equation of state. Core collapse supernovae stand out as highly anticipated sources in LIGO’s fourth observation (O4) run, prompting dedicated efforts to detect them. The integration of machine learning, specifically convolutional neural networks (CNN), has become a pivotal avenue for analysis. This study addresses a fundamental query: how can a …
Systematic Review On Isolation, Purification, Characterization, And Industrial Applications Of Thermophilic Microbial Α- Amylases, Rugaiyah A. Arfah, Sarlan Sarlan, Abdul Karim, Anita Anita, Ahyar Ahmad, Paulina Taba, Harningsih Karim, Siti Halimah Larekeng, Dorothea Agnes Rampisela, Rusdina Bte Ladju
Systematic Review On Isolation, Purification, Characterization, And Industrial Applications Of Thermophilic Microbial Α- Amylases, Rugaiyah A. Arfah, Sarlan Sarlan, Abdul Karim, Anita Anita, Ahyar Ahmad, Paulina Taba, Harningsih Karim, Siti Halimah Larekeng, Dorothea Agnes Rampisela, Rusdina Bte Ladju
Karbala International Journal of Modern Science
The α-amylase enzyme, sourced from diverse organisms, including plants, animals, and bacteria, plays a crucial role in multiple industries, notably food processing sectors like cakes, fruit juices, and starch syrup. Research identifies thermophilic organisms as prime sources of this enzyme thriving at temperatures ranging from 41°C to 122°C. The enzyme purification was carried out using liquid-liquid extraction, which involved the exchange of substances between two liquid phases that were immiscible or partially soluble. The optimal temperature for α-amylase was 45 to 90°C. The best pH for bacterial and fungal α-amylases ranged from 5.0 to 10.5 and 5.0 to 9.0. Based …
Exploring The Early Solar System: Cometary Chemical Fingerprints: A Study Of Comet C/2022 E3 (Ztf) Via Near-Infrared Spectroscopy, Grace Puchalski
Exploring The Early Solar System: Cometary Chemical Fingerprints: A Study Of Comet C/2022 E3 (Ztf) Via Near-Infrared Spectroscopy, Grace Puchalski
Undergraduate Research Symposium
Comets are small, icy remnants from the solar system formation (4.5 billion years ago). Their interior composition should reflect the composition and conditions presented in the mid-plane of the protoplanetary region where (and when) they formed. These small objects predominantly reside in two major reservoirs, the Oort cloud and the Kuiper belt. Comets coming from the Oort cloud have long orbital periods while comets from the Kuiper belt have short orbital periods (< 200 years). An overarching goal in astronomy is to understand the conditions presented in the planetary region in the early solar system. Since comets lack a known mechanism of self internal heating, any processes that have changed their composition should only affect a few meters deep, which is believed to be excavated over a course of a perihelion passage into the inner parts of the solar system. As comets get closer to the Sun, solar irradiation causes their ices to sublime, leaving a formation of a freely expanding atmosphere (coma). Depending on the science interest, astrophysicists use different techniques for data collection, a common one being spectroscopy. Using iSHELL spectrograph at the NASA-Near-Infrared Telescope Facility (IRTF), we examine the primary chemical composition (e.g., H2O, CO, CH4, C2H6, C2H2, H2CO, NH3, CH3OH, OCS, and OH) of cometary coma in bright comet C/2022 E3 (ZTF). Our preliminary results indicate the H2O production rate of ~3.4E28 (molecules per second), which corresponds to the rotational temperature of 86 (K). Cometary atmospheres are dense enough that molecules in the inner coma are thermalized by collision (Local Thermodynamic Equilibrium), thus 86 (K) is a physical parameter of coma. We compared the production of the rest of species with that of water (in %) and our results indicated that comet E3 was typical (close to average) in mixing ratios of all volatile species. By mapping the intensity of light with distance from the nucleus,we were able to examine the spatial distribution of volatiles and dust in E3’s coma which were consistent with production directly from the nucleus.