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The Waiting Room
Get PDFKirmser Undergraduate Research Award - Individual Freshman category, honorable mentionDavid MackayThis 10-minute playattempts to answer what truly makes life worth living. Through the eyes of ayoung man who recently suffered a fatal car accident, this story follows theemotional journey of this man coming to terms with how he spent his life onEarth
Host Microbiota Influences Interactions Between Hosts And Pathogens
Get PDFThis manuscript is the product of the graduate class BIOL890B: Host-Pathogen Interactions, which was taught Fall 2020 at Kansas State University. All students in the class share authorship equally and are listed in alphabetical order by last name in alphabetical order. This course was co-taught by Dr. Kristin Michel ([email protected]) and Dr. Thomas Platt ([email protected]), who serve as corresponding authors for this manuscript.Bacterial microbiota have significant effects on host interactions with pathogens in both vertebrate and invertebrate organisms. Here we discuss the direct and indirect impacts of microbiota on defense against pathogens. We found that microbiota have direct effects on host defense against pathogens through interference and niche competition, and by influencing host immune system development and function. The host microbiota also impacts host-pathogen interactions beyond immunity, by influencing physical barriers and physiological responses. In addition, it can influence the establishment of tumorigenic microbes thereby increasing cancer risk. Thus, the relationship between the host and its microbiota has short- and long-term impacts on overall health. Research that aims to identify and characterize the mechanisms that underlie these direct and indirect effects on host health will inform future medical treatments
Retrieval of full angular- and energy-dependent complex transition dipoles in the molecular frame from laser-induced high-order harmonic signals with aligned molecules
Get PDFHigh-order harmonic signals generated in molecules are the consequence of coherent summation of complex laser-induced transition dipoles d(θ,ω) with each fixed-in-space molecule; here θ is the angle of the molecular axis with respect to the laser polarization axis and ω is the harmonic energy. In the so-called rotational coherent spectroscopy, it is proposed to extract the fixed-in-space d(θ,ω) in the molecular frame by measuring harmonics generated by a probing laser from the rotational molecular wave packets that have been prepared by a prior pump laser. By varying the time delay between the two lasers, methods have been utilized to extract the θ dependence of both the amplitude and phase of each individual harmonic, but the relative phase between harmonics cannot be retrieved. Here we report that this limitation can be removed. It requires the additional measurement of harmonic spectra versus the pump-probe angles at one fixed time delay. The two-dimensional input harmonic data (time-delay and pump-probe angle) are then used to retrieve the full complex transition dipole d(θ,ω) using a retrieval method based on machine learning algorithms. We demonstrate this method on N2 and CO2 molecules
Molecular bond stabilization in the strong-field dissociation of O2+
Get PDFWe theoretically examine the rotational and vibrational dynamics of O2+ molecular ions exposed to intense, short laser pulses for conditions realized in contemporary pump-probe experiments. We solve the time-dependent Schrödinger equation within the Born-Oppenheimer approximation for an initial distribution of randomly aligned molecular ions. For fixed peak intensities, our numerical results show that total, angle-integrated O2+→O(3P)+O+(4S0) dissociation yields do not monotonically increase with increasing infrared-probe pulse duration. We find this pulse-duration-dependent stabilization to be consistent with the transient trapping of nuclear probability density in a light-induced (bond-hardening) potential-energy surface and robust against rotational excitation. We analyze this stabilization effect and its underlying bond-hardening mechanism (i) in the time domain, by following the evolution of partial nuclear probability densities associated with the dipole-coupled O2+(a4Πu) and O2+(f4Πg) cationic states, and (ii) in the frequency domain, by examining rovibrational quantum-beat spectra for the evolution of the partial nuclear probability densities associated with these states. Our analysis reveals the characteristic timescale for the bond-hardening mechanism in O2+ and explains the onset of bond stabilization for sufficiently long pulse durations
Semiclassical approach for solving the time-dependent Schr\"odinger equation in spatially inhomogeneous electromagnetic pulses
Get PDFTo solve the time-dependent Schrödinger equation in spatially inhomogeneous pulses of electromagnetic radiation, we propose an iterative semiclassical complex trajectory approach. In numerical applications, we validate this method against ab initio numerical solutions by scrutinizing (a) electronic states in combined Coulomb and spatially homogeneous laser fields and (b) streaked photoemission from hydrogen atoms and plasmonic gold nanospheres. In comparison with streaked photoemission calculations performed in strong-field approximation, we demonstrate the improved reconstruction of the spatially inhomogeneous induced plasmonic infrared field near a nanoparticle surface from streaked photoemission spectra
High-power few-cycle Cr:ZnSe mid-infrared source for attosecond soft x-ray physics
Get PDFThe development of mid-infrared, high-energy pulses of extremely short pulse duration is of great importance to the strong-field physics community, as it enables extension of the high-harmonic cutoff towards the keV range of photon energies. Here we demonstrate a Cr2+:ZnSe laser amplifier delivering 7 mJ, 100 fs pulses at 1 kHz repetition rate and 2.4 µm central wavelength with excellent energy stability and beam quality. These pulses are post-compressed to 39 fs, 6.2 mJ, and 115 GW peak power in a novel nonlinear compression scheme. The laser system was used to generate coherent soft x-ray radiation up to 0.6 keV covering the entire water window, which is of high importance for bio-relevant applications. The obtained results open a wide range of applications in nonlinear optics, attosecond and strong-field physics, and remote sensing
Environmental & architectural phenomenology. Vol. 31, issue 2
No full textBesides “Place and COVID-19,” “Items of interest,” and “citations received,” this issue includes the following items: An “in memoriam” for architect and sacred geometer Keith Critchlow, who died in London in April; A “book note” on philosopher Dermot Moran’s study, Husserl’s Crisis of the European Sciences and Transcendental Phenomenology (2010); A “book note” on philosopher Ingrid Leman Stefanovic’s The Wonder of Water (2020), an edited collection examining how human experience relates to decisions about water; Torontonian Robert Fabian’s update on downtown neighborhood planning in his city (“A New Urban Place”); Philosopher John Russon’s exploration of the lived ambiguity of travelling to a foreign place (“The Border at the Heart of Human Life”); Independent researcher Stephen Wood’s discussion of two contrasting modes of science teaching—what he calls “knowledge-based learning” vs. “understanding-based learning” (“An Understanding-Grounded Approach to Science Education”)’; Science educator Henri Bortoft’s explication of Goethe’s proto-phenomenology of nature as one example of a science of wholeness (originally published as four separate essays in the last four EAP issues and now integrated into one) (“Seeing and Understanding Holistically: Goethean Science and the Wholeness of Nature”)
Engineering Students’ Views on the Effectiveness of Peer Tutors in Scholars Assisting Scholars Program
Get PDFIn engineering education, retaining engineering students in the first two years of college is a critical issue when the attrition rate has been persistently high. Peer tutoring and supplemental instruction are widely used methods to help first year students and sophomores succeed in challenging courses in universities. Research has shown that peer tutoring improves academic outcomes such as achieving higher GPAs, higher retention rates, and improving student connectedness. In an earlier study we examined whether and to what degree a peer tutoring and supplemental instruction program called Scholars Assisting Scholars, SAS, implemented in a college of engineering facilitated student academic performance in a specific Calculus course. In this follow-up study, we focused on the impact of the peer tutoring and supplemental instruction program on students who utilized the peer tutoring program across a wide range of core courses
Exploring the experiences of Saudi mothers in the United States regarding the use of social networking sites of their adolescents
Get PDFDoctor of PhilosophySchool of Family Studies and Human ServicesKaren S. Myers-BowmanWalter R. SchummWe live in an era of constant communication, where Social Networking Sites (SNSs) are part of the technology revolution that has significantly altered our lives and means of communication. Adolescents are quick adopters of these sites; they spend a lot of their daily time interacting via these sites. Most parents in the United States strive to understand the purpose and function behind their children’s use of these technologies. This study is aimed to explore the Saudi mothers’ experiences with their adolescents in a different culture and country. The study focused on exploring the experiences, concerns, social and technical challenges, and strategies of Saudi mothers in the United States by using qualitative methodology. A snowball strategy was used through specific Saudi student groups and organizations in the United States. The participants recruited were Saudi mothers (N=13) who had adolescents (their ages are between 10- and 17-years-old). The interviews were transcribed verbatim, coded, and analyzed in light of symbolic interaction theory. The findings revealed some benefits of using SNSs among adolescents such as learning new languages or practicing the adolescent's native language. On the other hand, the findings also showed great concern among mothers and a lot of challenges about their adolescents’ use of SNSs. Also, the findings showed the roles of these mothers to protect, advise, and support their children regarding the use of SNSs. Mothers confirmed that their adolescents using SNSs without control or supervision may cause a lot of problems that affect adolescents, parents, and the relationships between them
Paul Hunt, Trombone, Faculty Artist Recital
No full textSeptember 3, 2019
7:30PM
All Faiths Chapel
Jan Van der Roost - Canzona Gothica
I. Motetus
II. Organum
III. Saltarello
Paul Hunt - A Perambulation of Lite Electronica based on G. F. Handel's Sonata for Recorder, Op. 1, No. 4
I. Slow a la Sibelius with NotePerformer
II. Fast - in the manner of Wendy Carlos
III. Slow - inspired by Isao Tomita
IV. Fast - with my iPad's help
Carl Vollrath - Jaunts for Trombone and Piano
I. Jaunty
II. Haunty
III. Taunty
Joseph Ott - Toccata for Trombone and Piano
Piazzolla - Oblivio