Radial Forcing and Edgar Allan Poe's Lengthening Pendulum

Inspired by Edgar Allan Poe's The Pit and the Pendulum, we investigate a radially driven, lengthening pendulum. We first show that increasing the length of an undriven pendulum at a uniform rate does not amplify the oscillations in a manner consistent with the behavior of the scythe in Poe's story. We discuss parametric amplification and the transfer of energy (through the parameter of the pendulum's length) to the oscillating part of the system. In this manner radial driving may easily and intuitively be understood, and the fundamental concept applied in many other areas. We propose and show by a numerical model that appropriately timed radial forcing can increase the oscillation amplitude in a manner consistent with Poe's story. Our analysis contributes a computational exploration of the complex harmonic motion that can result from radially driving a pendulum, and sheds light on a mechanism by which oscillations can be amplified parametrically. These insights should prove especially valuable in the undergraduate physics classroom, where investigations into pendulums and oscillations are commonplace.Comment: 16 page

The d 3Πd \: ^3 \Pi state of LiRb

We report our spectroscopic studies of the $d \ ^3\Pi$ state of ultra-cold $^7$Li$^{85}$Rb using resonantly-enhanced multi-photon ionization and depletion spectroscopy with bound-to-bound transitions originating from the metastable $a \ ^3\Sigma^+$ state. We evaluate the potential of this state for use as the intermediate state in a STIRAP transfer scheme from triplet Feshbach LiRb molecules to the $X \ ^1\Sigma^+$ ground state, and find that the lowest several vibrational levels possess the requisite overlap with initial and final states, as well as convenient energies. Using depletion measurements, we measured the well depth and spin-orbit splitting. We suggest possible pathways for short-range photoassociation using deeply-bound vibrational levels of this electronic state

Stueckelberg interferometry using periodically driven spin-orbit coupled Bose-Einstein condensates

We study the single-particle dispersion of a spin-orbit coupled (SOC) Bose-Einstein condensate (BEC) under the periodical modulation of the Raman coupling. This modulation introduces a further coupling of the SOC dressed eigenlevels, thus creating a second generation of modulation-dressed eigenlevels. Theoretical calculations show that these modulation-dressed eigenlevels feature a pair of avoided crossings and a richer spin-momentum locking, which we observe using BEC transport measurements. Furthermore, we use the pair of avoided crossings to engineer a tunable Stueckelberg interferometer that gives interference fringes in the spin polarization of BECs

Spin current generation and relaxation in a quenched spin-orbit-coupled Bose-Einstein condensate

Understanding the effects of spin-orbit coupling (SOC) and many-body interactions on spin transport is important in condensed matter physics and spintronics. This topic has been intensively studied for spin carriers such as electrons but barely explored for charge-neutral bosonic quasiparticles (including their condensates), which hold promises for coherent spin transport over macroscopic distances. Here, we explore the effects of synthetic SOC (induced by optical Raman coupling) and atomic interactions on the spin transport in an atomic Bose-Einstein condensate (BEC), where the spin-dipole mode (SDM, actuated by quenching the Raman coupling) of two interacting spin components constitutes an alternating spin current. We experimentally observe that SOC significantly enhances the SDM damping while reducing the thermalization (the reduction of the condensate fraction). We also observe generation of BEC collective excitations such as shape oscillations. Our theory reveals that the SOC-modified interference, immiscibility, and interaction between the spin components can play crucial roles in spin transport

The Telephone Consumer Protection Act of 1991: Adapting an “Odd” Law

The Telephone Consumer Protection Act (“TCPA”) was introduced in 1991 before the rise of the cell phone, text messages, and broadband internet. It placed restrictions on then-contemporary technology used to reach consumers in an automated way and its primary purpose was to protect consumer’s privacy interests and public safety. Yet, it has proven to be an odd and increasingly outdated law. The federal government has made a good-faith effort to maintain the TCPA’s relevancy. However, evolving technology and inconsistent interpretations of the law’s fundamental elements have resulted in harm to consumers and businesses. During the COVID-19 pandemic, the law also interfered with efforts to disseminate information quickly and efficiently to the public at the detriment of consumers. Last year, the Supreme Court brought some relief to businesses after it issued its highly anticipated decision in Facebook v. Duguid. The Court held that the capacity to use a random or sequential number generator to either store or produce phone numbers is a necessary feature of an Autodialer, rather than technology only needing the capacity to store phone numbers to be called and to dial such phone numbers automatically, a definition that once reached every American using a smartphone. Unfortunately, the Court was unable to modernize the law. With innovative technologies and government-enabled programs directed at protecting consumers’ privacy and economic interests, restrictions on the type of technology used to make the calls are no longer necessary today. The government can effectively accomplish its goal by regulating the contents of the call, not the technology used to make the call

Using Authentic Online Resources in Russian for STEM Coursework for Novice through Superior Level Learners

This article makes a case for incorporating STEM content into Russian language courses at the Novice through Superior levels of proficiency. The author presents models of asynchronous learning activities based on authentic online resources developed for a Russian for STEM pilot course taught during the COVID-19 pandemic. These lessons can be employed in online or face-to-face courses to prepare students to speak, read, write, and understand the language of STEM fields in Russian

Postcard: Men Cutting and Moving Wood

This black and white photographic postcard features a group of men at a machine that cuts large logs mechanically. The man on the left is carrying a cut log over to the log pile in the foreground. Four men are behind the machine. The man on the left is closest to the table saw and is holding the uncut log. The three men to the right of him are watching the process. The man on the right holds a large branch. Handwriting is on the back of the card.https://scholars.fhsu.edu/tj_postcards/1967/thumbnail.jp

Snapshots of the Soul

Snapshots of the Soul considers how photography has shaped Russian poetry from the early twentieth century to the present day. Drawing on theories of the lyric and the elegy, the social history of technology, and little-known archival materials, Molly Thomasy Blasing offers close readings of poems by Boris Pasternak, Marina Tsvetaeva, Joseph Brodsky, and Bella Akhmadulina, as well as by the late and post-Soviet poets Andrei Sen-Sen'kov, Arkadii Dragomoshchenko, and Kirill Medvedev, to understand their fascination with the visual language, representational power, and metaphorical possibilities offered by the camera and the photographic image. Within the context of long-standing anxieties about the threat that visual media pose to literary culture, Blasing finds that these poets were attracted to the affinities and tensions that exist between the lyric or elegy and the snapshot. Snapshots of the Soul reveals that at the core of each poet's approach to "writing the photograph" is the urge to demonstrate the superior ability of poetic language to capture and convey human experience