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1. Double Your Corners, Double Your Fun: The Doorway Camera

   https://doi.org/10.1109/ICCP54855.2022.9887738  

   Krska, William; Seidel, Sheila W.; Saunders, Charles; Czajkowski, Robinson; Yu, Christopher; Murray-Bruce, John; Goyal, Vivek (August 2022, IEEE International Conference on Computational Imaging (ICCP))

   In a built environment, wanting to see without direct line of sight is often due to being outside a doorway. The two vertical edges of the doorway provide occlusions that can be exploited for non-line-of-sight imaging by forming corner cameras. While each corner camera can separately yield a robust 1D reconstruction, joint processing suggests novelties in both forward modeling and inversion. The resulting doorway camera provides accurate and robust 2D reconstructions of the hidden scene. This work provides a novel inversion algorithm to jointly estimate two views of change in the hidden scene, using the temporal difference between photographs acquired on the visible side of the doorway. Successful reconstruction is demonstrated in a variety of real and rendered scenarios, including different hidden scenes and lighting conditions. A Cramer-Rao bound analysis is used to demonstrate the 2D resolving power of the doorway camera over other passive acquisition strategies and to motivate the novel biangular reconstruction grid. 

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2. Double Half-Heuslers

   https://doi.org/10.1016/j.joule.2019.04.003  

   Anand, Shashwat; Wood, Max; Xia, Yi; Wolverton, Chris; Snyder, G. Jeffrey (May 2019, Joule)
3. Double Microwave Shielding

   https://doi.org/10.1103/b8pm-3prn  

   Karman, Tijs; Bigagli, Niccolò; Yuan, Weijun; Zhang, Siwei; Stevenson, Ian; Will, Sebastian (June 2025, PRX Quantum)

   We develop double microwave shielding, which has recently enabled evaporative cooling to the first Bose-Einstein condensate of polar molecules [Bigagli , Nature , 289 (2024)]. Two microwave fields of different frequency and polarization are employed to effectively shield polar molecules from inelastic collisions and three-body recombination. Here, we describe in detail the theory of double microwave shielding. We demonstrate that double microwave shielding effectively suppresses two- and three-body losses. Simultaneously, dipolar interactions and the scattering length can be flexibly tuned, enabling comprehensive control over interactions in ultracold gases of polar molecules. We show that this approach works universally for a wide range of molecules. This opens the door to studying many-body physics with strongly interacting dipolar quantum matter. 

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4. Accessing generalized TMDs through double Drell-Yan and double $$\eta_c$$ production processes

   https://doi.org/10.22323/1.316.0149  

   Bhattacharya, Shohini; Metz, Andreas; Kumar Ojha, Vikash; Tsai, Jeng-Yuan; Zhou, Jian (September 2018, Proceedings, 26th International Workshop on Deep Inelastic Scattering and Related Subjects (DIS 2018)))
5. Combing a double helix

   https://doi.org/10.1039/d1sm01533h  

   Plumb-Reyes, Thomas B.; Charles, Nicholas; Mahadevan, L. (April 2022, Soft Matter)

   Combing hair involves brushing away the topological tangles in a collective curl, defined as a bundle of interacting elastic filaments. Using a combination of experiment and computation, we study this problem that naturally links topology, geometry and mechanics. Observations show that the dominant interactions in hair are those of a two-body nature, corresponding to a braided homochiral double helix. This minimal model allows us to study the detangling of an elastic double helix driven by a single stiff tine that moves along it and leaves two untangled filaments in its wake. Our results quantify how the mechanics of detangling correlates with the dynamics of a topological quantity, the link density, that propagates ahead of the tine and flows out the free end as a link current. This in turn provides a measure of the maximum characteristic length of a single combing stroke in the many-body problem on a head of hair, producing an optimal combing strategy that balances trade-offs between comfort, efficiency and speed of combing in hair curls of varying geometrical and topological complexity. 

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