Recovery of Cenospheres and Fine Fraction from Coal Fly Ash by a Novel Dry Separation Method by Jan Wrona, Witold Żukowski, Dariusz Bradło, Piotr Czupryński

“…It is comprised of fluidised bed separation followed by screening and pneumatic separation in a free-fall air chamber. Fluidised bed separation was assisted by a mechanical activator to prevent agglomeration. …”
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Development of a Modular Didactic Laboratory Set for the Experimental Study of Friction by Jasmina Miljojković*, Vladimir Kočović, Milentije Luković, Aleksandra Živković, Katica Šimunović

“…The authors deal with the most critical case - a free fall of a shell-shaped pin down the cylindrical guide when, theoretically, the friction force is equal to zero, while the air resistance force has a maximum value. …”
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Imprints of dark matter on black hole shadows using spherical accretions by K. Saurabh, Kimet Jusufi

“…In particular, we consider two specific models for the optical-thin disk region: a gas at rest and a gas in a radial free fall. Due to the effect of dark matter on the spacetime geometry, we find that the dark matter can increase or decrease the intensity of the electromagnetic flux radiation depending on the dark matter model. …”
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Was Newton right? A search for non-Newtonian behavior of weak-field gravity by Boynton Paul, Moore Michael, Newman Riley, Berg Eric, Bonicalzi Ricco, McKenney Keven

“…Guided by Galileo's work and his own experiments, Newton formulated a theory of gravity in which the force of attraction between two bodies is independent of composition and proportional to the inertia of each, thereby transparently satisfying Galileo's empirically informed conjecture regarding the Universality of Free Fall. Similarly, Einstein honored the manifest success of Newton’s theory by assuring that the linearized equations of GTR matched the Newtonian formalism under “classical” conditions. …”
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Adaptive Kalman Filter for Real-Time Visual Object Tracking Based on Autocovariance Least Square Estimation by Jiahong Li, Xinkai Xu, Zhuoying Jiang, Beiyan Jiang

“…Experimental validations on tracking the centroid of a moving ball subjected to projectile motion, free-fall bouncing motion, and back-and-forth linear motion, reveal that the AKF-ALS algorithm outperforms a standard KF with fixed noise statistics.…”
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Collective variables between large-scale states in turbulent convection by Priyanka Maity, Andreas Bittracher, Péter Koltai, Jörg Schumacher

“…Our analysis is based on long-term direct numerical simulation trajectories of turbulent convection in a closed cubic cell at a Prandtl number Pr=0.7 and Rayleigh numbers Ra=10^{6} and 10^{7} for a time lag of 10^{5} convective free-fall time units. The simulations resolve vortices and plumes of all physically relevant scales, resulting in a state space spanned by more than 3.5 million degrees of freedom. …”
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The MICROSCOPE space mission to test the Equivalence Principle by Touboul, Pierre, Métris, Gilles, Rodrigues, Manuel, André, Yves, Robert, Alain

“…Its principle is to compare the free fall of concentric test masses embedded in a space accelerometer onboard a satellite orbiting the Earth. …”
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Observations of Earth’s Normal Modes on Broadband Ocean Bottom Seismometers by Gabi Laske

“…However, given the high costs of an OBS campaign, the fact that data are openly available to future investigators not involved in the campaign, and the fact that seismology is evolving to investigate ever-new signals, this paper makes the case that the investment in a high-quality seismic sensor may be a wise one, even for a free-fall OBS.…”
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Uncertainty principle from the noise of gravitons by Soham Sen, Sunandan Gangopadhyay

“…There the authors have calculated the quantum gravity modified Newton’s law of free fall where the spacetime has been considered to be weakly curved. …”
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“At Sea”: Reversibility in Teaching and Learning by Cavicchi, Elizabeth M

“…In beginning to teach through exploration, the author and an undergraduate experimented with free fall motion. Experiencing disequilibrium, the student reconstructed her understanding of time as concurrently continuous and divisible. …”
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A compact cold-atom microwave clock prototype by Knapp, M

“…The prototype is intended as a benchtop experiment, where the procedure of interrogating a cloud of caesium atoms during free fall can be explored. Both open- and closed-loop spectroscopy of the clock transition have been performed. …”

Investigation on potential of recycle plastic bottles as a crash cushion for road barrier by Ambak, Kamarudin, Hadipramana, Josef, Abas, Nurul Aimi, Mokhatar, Shahrul Niza, Jaini, Zainorizuan

“…Some plastic bottles of soft drinks containing ordinary sand was prepared and undergone experimental and simulation works. Free fall Impact test that imposed on the plastic bottles has been carried out to identify the strength and its energy absorption. …”
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Influence of the Antenna Orientation on WiFi-Based Fall Detection Systems by Jorge D. Cardenas, Carlos A. Gutierrez, Ruth Aguilar-Ponce

“…Furthermore, the implementation of a device-free fall detection platform to collect empirical data on falls is shown. …”
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Design and Fabrication of a Differential Electrostatic Accelerometer for Space-Station Testing of the Equivalence Principle by Fengtian Han, Tianyi Liu, Linlin Li, Qiuping Wu

“…To achieve the targeted test accuracy, the sensitive space accelerometer will use the very soft space environment provided by a quasi-drag-free floating capsule and long-time observation of the free-fall mass motion for integration of the measurements over 20 orbits. …”
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On the need to classify rock mass fed to dry magnetic separation by Darya N. Shibaeva, Sergey V. Tereshchenko, Danila A. Asanovich, Pavel A. Shumilov

“…It has been proved that the use of a vibrating feeder for feeding the material to the working area of a magnetic separator makes it possible to: form a monolayer on the surface of the vibrating feeder chute with a thickness close to the maximum size of a lump of separated ore; implement batch feed of material to the separation zone; increase the spacing between lumps in the separation zone when passing through the free fall area, thereby allowing dry magnetic separation of ferruginous quartzites of size class –80+0 mm without pre-preparation.…”
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Gravitational Redshift in Quantum-Clock Interferometry by Albert Roura

“…Finally, the relation of the proposed doubly differential measurement scheme to other experimental approaches and to tests of the universality of free fall is discussed in detail.…”
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Investigation on Behaviours along Weak Axes of Steel Beam under Low Velocity Impact Loading: Experimental and Numerical by Mohammad Manzoor Nasery

“…To do so, eight supported rectangular hollow steel beam samples were constructed, and a circular head hammer weighing 75 kg was dropped as a free fall along the weak axes of these beams. Each fall had a different drop height (ranging from 250 mm to 2000 mm) and different amounts of energy (ranging from 183 J to 1471 J) in order to compare the structural behaviors of the beams against low velocity impacts with different drop heights and energy levels. …”
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How the Big Bang Ends Up Inside a Black Hole by Enrique Gaztanaga

“…As there is no pressure support, the cold collapse can continue inside in free fall until it reaches atomic nuclear saturation (GeV), when is halted by Quantum Mechanics, as two particles cannot occupy the same quantum state. …”
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Desalination of salt water by drip freezing at winter sprinkling by A. V. Sosnovsky, N. I. Osokin

“…The ice fraction in an individual drop and in a stream of drops in a free fall is estimated. At the air temperatures of −10 and −40 °C, the percentage of ice in a stream of water drops with a mineralization of 35 g/l may amount to 12 and 39%, respectively. …”
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Analysis of the timing of freely falling antihydrogen by Olivier Rousselle, Pierre Cladé, Saïda Guellati-Khelifa, Romain Guérout, Serge Reynaud

“…We evaluate the accuracy to be expected for the measurement of free fall acceleration of antihydrogen in the GBAR experiment, accounting for the recoil transferred in the photodetachment process. …”
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