7 research outputs found
Valley: Video Assistant with Large Language model Enhanced abilitY
Large language models (LLMs), with their remarkable conversational
capabilities, have demonstrated impressive performance across various
applications and have emerged as formidable AI assistants. In view of this, it
raises an intuitive question: Can we harness the power of LLMs to build
multimodal AI assistants for visual applications? Recently, several multi-modal
models have been developed for this purpose. They typically pre-train an
adaptation module to align the semantics of the vision encoder and language
model, followed by fine-tuning on instruction-following data. However, despite
the success of this pipeline in image and language understanding, its
effectiveness in joint video and language understanding has not been widely
explored. In this paper, we aim to develop a novel multi-modal foundation model
capable of comprehending video, image, and language within a general framework.
To achieve this goal, we introduce Valley, a Video Assistant with Large
Language model Enhanced abilitY. The Valley consists of a LLM, a temporal
modeling module, a visual encoder, and a simple projection module designed to
bridge visual and textual modes. To empower Valley with video comprehension and
instruction-following capabilities, we construct a video instruction dataset
and adopt a two-stage tuning procedure to train it. Specifically, we employ
ChatGPT to facilitate the construction of task-oriented conversation data
encompassing various tasks, including multi-shot captions, long video
descriptions, action recognition, causal relationship inference, etc.
Subsequently, we adopt a pre-training-then-instructions-tuned pipeline to align
visual and textual modalities and improve the instruction-following capability
of Valley. Qualitative experiments demonstrate that Valley has the potential to
function as a highly effective video assistant that can make complex video
understanding scenarios easy
Surface Acidification of BiOI/TiO2 Composite Enhanced Efficient Photocatalytic Degradation of Benzene
A novel BiOI/TiO2 nano-heterojunction was prepared using hydrothermal and sol-gel methods. The composite material was characterized by X-ray diffraction, ultraviolet-visible diffuse reflection spectroscopy, scanning electron microscopy, and transmission electron microscopy. The crystallinity and response to light of BiOI/TiO2 were controlled by preparation conditions such as the optimal solvent condition and heat treatment temperature. The photocatalytic activity of the BiOI/TiO2 catalyst was examined using benzene as a test molecule. The benzene degradation rate of the composite catalyst under visible light was enhanced compared to pure TiO2, thus reaching 40% of the original benzene concentration, which increased further to >60% after surface acidification. The fluorescence spectra, light current, and electron paramagnetic resonance confirmed that the enhanced activity was attributed to carrier separation by the heterojunction. The acid sites and active chlorine of hydrochloric acidification offer a novel mechanism for photocatalytic reactions
A Review on Cyanide Gas Elimination Methods and Materials
Cyanide gas is highly toxic and volatile and is among the most typical toxic and harmful pollutants to human health and the environment found in industrial waste gas. In the military context, cyanide gas has been used as a systemic toxic agent. In this paper, we review cyanide gas elimination methods, focusing on adsorption and catalysis approaches. The research progress on materials capable of affecting cyanide gas adsorption and catalytic degradation is discussed in depth, and the advantages and disadvantages of various materials are summarized. Finally, suggestions are provided for future research directions with respect to cyanide gas elimination materials
Propagation and Diffusion of Fluorescent Substances with Footprints in Indoor Environments
Some studies have shown that contaminants can be transferred between floors and the soles, and there are few studies on pollutant propagation caused by human walking in real-life situations. This study explored the propagation and diffusion law of ground pollutants from rubber soles to poly vinyl chloride (PVC) floor during indoor walking through employing a fluorescent solution as a simulant. The footprint decay (D) and transfer efficiency (τ) of the fluorescent solution transferred from the sole to the indoor floor during walking were analyzed based on the fluorescent footprint imaging. The effects of namely body weight (50–75 kg), walking frequency (80–120 steps/min), and solution viscosity (oil and water) were also investigated. It was found that the total fluorescence gray value on the ground decreased exponentially as the number of walking steps (i) increased. The relationship between the normalized gray value of the fluorescent solution (D) on each floor panel i was Di=aebi,2.1≤a≤3.8,–1.4≤b≤–0.7, and τ was distributed in the range of 0.51–0.72. All influencing factors had a significant effect on a, and a greater body weight resulted in a smaller a value, while only the body weight had a significant effect on b and τ, and a greater body weight led to larger b and lower τ values
Surface Acidification of BiOI/TiO<sub>2</sub> Composite Enhanced Efficient Photocatalytic Degradation of Benzene
A novel BiOI/TiO2 nano-heterojunction was prepared using hydrothermal and sol-gel methods. The composite material was characterized by X-ray diffraction, ultraviolet-visible diffuse reflection spectroscopy, scanning electron microscopy, and transmission electron microscopy. The crystallinity and response to light of BiOI/TiO2 were controlled by preparation conditions such as the optimal solvent condition and heat treatment temperature. The photocatalytic activity of the BiOI/TiO2 catalyst was examined using benzene as a test molecule. The benzene degradation rate of the composite catalyst under visible light was enhanced compared to pure TiO2, thus reaching 40% of the original benzene concentration, which increased further to >60% after surface acidification. The fluorescence spectra, light current, and electron paramagnetic resonance confirmed that the enhanced activity was attributed to carrier separation by the heterojunction. The acid sites and active chlorine of hydrochloric acidification offer a novel mechanism for photocatalytic reactions