We present an atom-chip-based realization of quantum cavity optomechanics with cold atoms localized within a Fabry-Perot cavity. Effective sub-wavelength positioning the atomic ensemble allows for tuning linear and quadratic optomechanical coupling parameters, varying sensitivity to displacement strain compressible gaseous cantilever. observe effects such on optical nonlinearity frequency shifts, providing their first characterization in quadratic-coupling regime.

Ternary extractive distillation (TED) is an effective and sustainable separation process for treating pharmaceutical wastewater containing ethyl acetate/isopropanol/water, corresponding to three binary azeotropes, realize the recovery of acetate isopropanol. Visual Basic software was used optimize using a single solvent mixed in different proportions based on sequential iterative optimization method, optimal mixture proportion (30% DMSO+70% EG) determined. The economic environmental...

Abstract Background Coronary artery angiography is an indispensable assistive technique for cardiac interventional surgery. Segmentation and extraction of blood vessels from coronary angiographic images or videos are very essential prerequisites physicians to locate, assess diagnose the plaques stenosis in vessels. Methods This article proposes a novel segmentation framework that combines three–dimensional (3D) convolutional input layer two–dimensional (2D) network. Instead single image...

Abstract Background Coronary heart disease is one of the diseases with highest mortality rate. Due to important position cardiovascular prevention and diagnosis in medical field, segmentation images has gradually become a research hotspot. How segment accurate blood vessels from coronary angiography videos assist doctors making analysis goal our research. Method Based on U-net architecture, we use context-based convolutional network for capturing more information vessel video. The proposed...

We show that mode locking finds a purely quantum nondissipative counterpart in atom-optical accelerator modes. These modes are formed by exposing cold atoms to periodic kicks the direction of gravitational field. They anchored generalized Arnol'd tongues, parameter regions where driven nonlinear classical systems exhibit locking. A hierarchy for rational numbers known as Farey tree provides an ordering tongues and hence experimentally observed

We subject a falling cloud of cold cesium atoms to periodic kicks from sinusoidal potential created by vertical standing wave laser light. By controllably accelerating the potential, we show quantum accelerator mode dynamics be highly sensitive effective gravitational acceleration when close specific, resonant values. This sensitivity control parameter is reminiscent that associated with classical chaos and promises techniques for precision measurement.

Applying the direct simulation Monte Carlo (DSMC) method developed for ultracold Bose-Fermi mixture gases research, we study sympathetic cooling process of 6Li and 133Cs atoms in a crossed optical dipole trap. The obstacles to producing Fermi degenerate gas via with are also analyzed, by which find that side-effect gravity is one main obstacles. Based on dynamic nature atoms, suggest two-stage two pairs beams microgravity environment. According our simulations, temperature can be cooled T =...

We discuss the use of high-order quantum accelerator modes to achieve an atom optical realization a biased random walk. first how one can create coexistent modes, and hence momentum transfer that depends on atoms' internal state be achieved. When combined with microwave driving transition between states, different type atomic beam splitter results. This permits walk through modes.

The realization of Bose–Einstein condensation 133Cs relies on an innovative evaporative cooling technique using a dimple potential. Correctly loading atomic gas into such potential produces dense sample with high phase space density, ideal for cooling. We have numerically simulated both the process and subsequent from in order to elucidate optimization this technique. Furthermore, we demonstrate that would be effective 85Rb quantum degeneracy describe simple scheme its implementation.

Applying the direct Monte Carlo simulation (DSMC) method developed for a cold atom system, we study evaporative cooling process in tilted optical dipole traps with magnetic field gradient-induced over-levitation or merely gravitational force. We propose two-stage decomposed microgravity environment, and suggest that quantum degeneracy can be obtained at few picokelvins several thousand atoms.

Abstract Fisheye cameras are widely used in surveillance, automotive systems, virtual reality, and panoramic photography due to their wide‐angle perspective. However, images captured by fisheye suffer from significant geometric distortions, affecting image analysis understanding. This distortion bends straight lines into curves, resulting a barrel‐shaped appearance of the image. To mitigate these effects transform regular perspective, correction is necessary, enabling more accurate reliable...

We study the efficiency of evaporative cooling a trapped gas caesium atoms in hydrodynamic regime by numerical solution classical kinetic theory equations. The results simulation are compared to our experimental observations magnetically 133Cs F = 3, mF −3 state. accurately reproduces performance and indicates that reduction as enters is main obstacle realization Bose–Einstein condensation (BEC) this used explore alternative routes BEC.

Applying the direct simulation Monte Carlo (DSMC) method developed for cold atom system, we explore possibility of a high-efficiency sympathetic cooling process between 87Rb and 40K without gravitational force in an optical trap. The relation pre-cooling Bosons efficiency is also studied. We find that absence beneficial to cooling. Furthermore, inefficient will fact hamper creation Fermi degenerate gases. This suggests advantages microgravity.

Ultracold atoms with two hyperfine internal states in optical lattices are proposed to demonstrate a two-dimensional spin-$1/2$ model under transverse effective staggered magnetic field. The field is produced by Raman process and can be modulated the intensities of additional light fields. This lattice protocol investigate quantum phenomena induced wider parameter range controllable interaction between spins nearest-neighbor atoms.

We present a modified Bitter-type electromagnet which features high magnetic field, fine electronic properties and efficient heat removal. The is constructed from stack of copper layers separated by mica that have the same shape. A distinctive design cooling channels on insulating parallel ducts between ensures low resistance for water to flow. continuous current control system also made regulate through electromagnet. In our experiment, versatile electromagnets are applied generate field...

In many experiments isolated atoms and ions have been inserted into high-finesse optical resonators for the study of fundamental quantum optics information. Here, we introduce another application such a system, as realization cavity optomechanics where collective motion an atomic ensemble serves role moveable element in resonator. Compared with other optomechanical systems, those incorporating nanofabricated cantilevers or large mirrors gravitational observatories, our cold-atom offers...

Abstract Background: With the current worldwide spreading of coronary virus (COVID-19) pandemic, accurately predicting rate spread has become an urgent need. Methods: In this article we propose a universal COVID-19 prediction model that is independent country-specific factors in paper. By analyzing pandemic data China, combined advantages Gaussian function with chi-square distribution function, to render innovative mathematical named H-Gaussian five parameters be learned, and solved by...

We propose a novel method for the realization of an optical Kagome lattice due to Raman processes driven by additional light fields applied ultracold atoms two hyperfine internal states trapped in planar triangular lattice. The tunneling between different nearest-neighbor lattices can be adjusted independently on-site interaction. This protocol used investigate magnetic quantum phenomena and coupling becomes strong enough increasing intensities fields.

Swin Transformer is an important work among all the attempts to reduce computational complexity of Transformers while maintaining its excellent performance in computer vision. Window-based patch self-attention can use local connectivity image features, and shifted window-based enables communication information between different patches entire scope. Through in-depth research on effects sizes windows efficiency, this article proposes a Dual-Scale with double-sized window attention method. The...

<title>Abstract</title> Keypoint detection and descriptor matching are essential in tasks like feature matching, object tracking, 3D reconstruction. While CNN-based methods have advanced these areas, most focus on perspective projection cameras, with limited consideration of fisheye which introduce significant distortion. Conventional keypoint failed images, causing camera models to underperform hybrid setups. This paper proposes a robust description method under model, addressing challenges...