Switchable polarization manipulation, optical logical gates and conveyor belt based on U-shaped \ce{VO2} nanoholes

Based on U-shaped plasmonic nanoholes in an \ce{Au-VO2-Au} film, we propose to achieve several switchable functions at the telecom wavelength by transition from the \ce{VO2} semiconductive state to the metallic state. The first is the polarization manipulation of four different polarization states ($x\&y$-polarization, LCP, and RCP). An array of U-shaped holes constitutes of the high efficiency SPP splitter, and thus the spin-encoded optical logical gates can be achieved. Furthurmore, we prove that a nano-optical conveyor belt can be build up with such U-shaped holes, making the transport of nanoparticles over the film efficiency by transforming between two spin states periodically, and the transport direction switchably along with the \ce{VO2} phase

Multi-Context Attention for Human Pose Estimation

In this paper, we propose to incorporate convolutional neural networks with a multi-context attention mechanism into an end-to-end framework for human pose estimation. We adopt stacked hourglass networks to generate attention maps from features at multiple resolutions with various semantics. The Conditional Random Field (CRF) is utilized to model the correlations among neighboring regions in the attention map. We further combine the holistic attention model, which focuses on the global consistency of the full human body, and the body part attention model, which focuses on the detailed description for different body parts. Hence our model has the ability to focus on different granularity from local salient regions to global semantic-consistent spaces. Additionally, we design novel Hourglass Residual Units (HRUs) to increase the receptive field of the network. These units are extensions of residual units with a side branch incorporating filters with larger receptive fields, hence features with various scales are learned and combined within the HRUs. The effectiveness of the proposed multi-context attention mechanism and the hourglass residual units is evaluated on two widely used human pose estimation benchmarks. Our approach outperforms all existing methods on both benchmarks over all the body parts.Comment: The first two authors contribute equally to this wor

Object Detection in Videos with Tubelet Proposal Networks

Object detection in videos has drawn increasing attention recently with the introduction of the large-scale ImageNet VID dataset. Different from object detection in static images, temporal information in videos is vital for object detection. To fully utilize temporal information, state-of-the-art methods are based on spatiotemporal tubelets, which are essentially sequences of associated bounding boxes across time. However, the existing methods have major limitations in generating tubelets in terms of quality and efficiency. Motion-based methods are able to obtain dense tubelets efficiently, but the lengths are generally only several frames, which is not optimal for incorporating long-term temporal information. Appearance-based methods, usually involving generic object tracking, could generate long tubelets, but are usually computationally expensive. In this work, we propose a framework for object detection in videos, which consists of a novel tubelet proposal network to efficiently generate spatiotemporal proposals, and a Long Short-term Memory (LSTM) network that incorporates temporal information from tubelet proposals for achieving high object detection accuracy in videos. Experiments on the large-scale ImageNet VID dataset demonstrate the effectiveness of the proposed framework for object detection in videos.Comment: CVPR 201

Numerical investigation of the phase change in transpiration cooling with the VOF method

Transpiration cooling with phase change is numerically investigated in the present work. As shown in Figure 1, a liquid coolant flow is injected into a porous medium from the bottom side. The porous medium receives heat from the hot gas on the top surface and heats the coolant. Thus, phase change can occur in this porous medium. The surface temperature, the heat flux received by the porous medium, the phase distribution and the flow and cooling characteristics are the most important unknowns on this topic. Please download the full abstract below

PARA A TELEOLOGIA MORAL: UM ESTUDO COMPARATIVO DE KANT E ZHU XI

Kant’s coining of «reflective judgment» in the third Critique by a conceptual clarification of the third higher cognitive faculty has long been criticized as redundant for his philosophical system and deemed a typical Kantian architectonic failure. Zhu Xi’s vital development of the doctrine «gewu» in his commentary on The Great Learning has been attacked for centuries for committing a hermeneutic fallacy. I argue that a comparative study shows that both conceptions steered a metaphysical transition towards «the supersensible» in each philosophy, leading to a similar construction of moral teleology. Zhu Xi’s «li» is comparable to Kant’s «purpose» as a moral teleological property. The Neo-Confucian li-qi dichotomy provides a counterpart of the Kantian double causality. Nevertheless, Neo-Confucian moral teleology does not rely on a Kantian-type rationalistic deduction concerning the idea of highest good (as final purpose) nor on the so-called intellectual intuition. Gewu looks outwards for the moral coherence between humans and things, while Kant ultimately rejects the natural world for the sake of moral certainty in terms of freedom and identifies what is unique within us.A cunhagem de Kant do “juízo reflexivo” na terceira Crítica pela clarificação conceitual da terceira faculdade cognitiva superior há muito tempo tem sido criticada como redundante por seu sistema filosófico e considerada um típico fracasso arquitetônico kantiano. O desenvolvimento vital de Zhu Xi da doutrina “gewu” em seu comentário sobre The Great Learning foi atacado por séculos por cometer uma falácia hermenêutica. Argumento que um estudo comparativo mostra que ambas as concepções conduziram a uma transição metafísica em direção ao “suprassensível” em cada filosofia, levando a uma construção semelhante de teleologia moral. O “li” de Zhu Xi é comparável ao “propósito” de Kant como uma propriedade teleológica moral. A dicotomia li-qi neoconfuciana fornece uma contraparte da dupla causalidade kantiana. No entanto, a teleologia moral neoconfuciana não depende de uma dedução racionalista do tipo kantiano a respeito da ideia do bem maior (como finalidade final) nem da chamada intuição intelectual. Gewu procura no exterior a coerência moral entre os seres humanos e as coisas, enquanto Kant acaba rejeitando o mundo natural em nome da certeza moral em termos de liberdade e identificação do que há de único dentro de nós

The global well-posedness and Newtonian limit for the relativistic Boltzmann equation in a periodic box

In this paper, we study the Newtonian limit for relativistic Boltzmann equation in a periodic box $\mathbb{T}^3$. We first establish the global-in-time mild solutions of relativistic Boltzmann equation with uniform-in-$\mathfrak{c}$ estimates and time decay rate. Then we rigorously justify the global-in-time Newtonian limits from the relativistic Boltzmann solutions to the solution of Newtonian Boltzmann equation in $L^1_pL^{\infty}_x$. Moreover, if the initial data of Newtonian Boltzmann equation belong to $W^{1,\infty}(\mathbb{T}^3\times\mathbb{R}^3)$, based on a decomposition and $L^2-L^\infty$ argument, the global-in-time Newtonian limit is proved in $L^{\infty}_{x,p}$. The convergence rates of Newtonian limit are obtained both in $L^1_pL^{\infty}_x$ and $L^{\infty}_{x,p}$.Comment: 56 pages, All comments are welcom