154 research outputs found
TPA-Net: Generate A Dataset for Text to Physics-based Animation
Recent breakthroughs in Vision-Language (V&L) joint research have achieved
remarkable results in various text-driven tasks. High-quality Text-to-video
(T2V), a task that has been long considered mission-impossible, was proven
feasible with reasonably good results in latest works. However, the resulting
videos often have undesired artifacts largely because the system is purely
data-driven and agnostic to the physical laws. To tackle this issue and further
push T2V towards high-level physical realism, we present an autonomous data
generation technique and a dataset, which intend to narrow the gap with a large
number of multi-modal, 3D Text-to-Video/Simulation (T2V/S) data. In the
dataset, we provide high-resolution 3D physical simulations for both solids and
fluids, along with textual descriptions of the physical phenomena. We take
advantage of state-of-the-art physical simulation methods (i) Incremental
Potential Contact (IPC) and (ii) Material Point Method (MPM) to simulate
diverse scenarios, including elastic deformations, material fractures,
collisions, turbulence, etc. Additionally, high-quality, multi-view rendering
videos are supplied for the benefit of T2V, Neural Radiance Fields (NeRF), and
other communities. This work is the first step towards fully automated
Text-to-Video/Simulation (T2V/S). Live examples and subsequent work are at
https://sites.google.com/view/tpa-net
Macroscale Chemotaxis from a Swarm of Bacteria-Mimicking Nanoswimmers
Inspired by the dynamics of bacterial swarming, we report a swarm of polymer‐brush‐grafted, glucose‐oxidase‐powered Janus gold nanoswimmers with a positive, macroscale chemotactic behavior. These nanoswimmers are prepared through the grafting of polymer brushes onto one side of gold nanoparticles, followed by functionalization with glucose oxidase on the other side. The resulting polymer‐brush‐functionalized Janus gold nanoswimmers exhibit efficient propulsion with a velocity of up to approximately 120 body lengths s−1 in the presence of glucose. The comparative analysis of their kinematic behavior reveals that the grafted polymer brushes significantly improve the translational diffusion of Janus gold nanoswimmers. Particularly, these bacteria‐mimicking Janus gold nanoswimmers display a collectively chemotactic motion along the concentration gradient of a glucose resource, which could be observed at the macroscale
Prompt-enhanced Hierarchical Transformer Elevating Cardiopulmonary Resuscitation Instruction via Temporal Action Segmentation
The vast majority of people who suffer unexpected cardiac arrest are
performed cardiopulmonary resuscitation (CPR) by passersby in a desperate
attempt to restore life, but endeavors turn out to be fruitless on account of
disqualification. Fortunately, many pieces of research manifest that
disciplined training will help to elevate the success rate of resuscitation,
which constantly desires a seamless combination of novel techniques to yield
further advancement. To this end, we collect a custom CPR video dataset in
which trainees make efforts to behave resuscitation on mannequins independently
in adherence to approved guidelines, thereby devising an auxiliary toolbox to
assist supervision and rectification of intermediate potential issues via
modern deep learning methodologies. Our research empirically views this problem
as a temporal action segmentation (TAS) task in computer vision, which aims to
segment an untrimmed video at a frame-wise level. Here, we propose a
Prompt-enhanced hierarchical Transformer (PhiTrans) that integrates three
indispensable modules, including a textual prompt-based Video Features
Extractor (VFE), a transformer-based Action Segmentation Executor (ASE), and a
regression-based Prediction Refinement Calibrator (PRC). The backbone of the
model preferentially derives from applications in three approved public
datasets (GTEA, 50Salads, and Breakfast) collected for TAS tasks, which
accounts for the excavation of the segmentation pipeline on the CPR dataset. In
general, we unprecedentedly probe into a feasible pipeline that genuinely
elevates the CPR instruction qualification via action segmentation in
conjunction with cutting-edge deep learning techniques. Associated experiments
advocate our implementation with multiple metrics surpassing 91.0%.Comment: Transformer for Cardiopulmonary Resuscitatio
Substituent effects and mechanism elucidation of enantioselective sulfoxidation catalyzed by vanadium Schiff base complexes
The effects of substituents of the Schiff base ligands on oxo-vanadium-catalyzed enantioselective sulfoxidation were first systematically studied, and a rational mechanism of enantioselective sulfoxidation based on our experimental data and the reported data is proposed
Experimental and theoretical studies on nickel-zinc-catalyzed cross-coupling of gem-dibromoalkenes with P(O)-H compounds
National Basic Research Program of China [2012CB821600]; Chinese National Natural Science Foundation [21305115, 21202135, 21173178, 21232005, 81301888]; Program for Changjiang Scholars and Innovative Research Team in UniversityA new stereoselective one-pot protocol for the preparation of E-alkenyl-phosphorus compounds under catalysis of an inexpensive nickel-zinc catalyst system has been developed, which provides a potential useful method for C-P bond formation. P-31 NMR spectrum and density functional theory calculations were performed to study the reaction mechanism
Catalyst-free synthesis of cycloalkenyl phosphonates
The reactions described provide a facile and efficient access to cycloalkenyl phosphonates with good to excellent yields via Diels-Alder cycloadditions between alkynyl phosphonates and 1,3-dienes under catalyst-free conditions. This journal is ? the Partner Organisations 2014
Palladium-catalyzed air-based oxidative coupling of arylboronic acids with H-phosphine oxides leading to aryl phosphine oxides
We present a novel and highly efficient methodology that allows for the construction of C-P bonds via the palladium-catalyzed air-based oxidative coupling of various commercially available arylboronic acids with easily oxidized H-phosphine oxides leading to valuable aryl phosphine oxides, particularly triarylphosphine oxides, with the use of air as the green oxidant, broad substrate applicability and good to excellent yields. The described catalytic system should be an efficient complement to the Chan-Lam type reaction and be useful in synthetic programs. This journal is ? the Partner Organisations 2014
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