Sink mark degrades the surface quality of the thick-walled injection molded components. An effective method for quantifying sink marks, and predicting the occurrence of such defects as a function of the injection mold...
详细信息
In the current practical science, the accuracy in the formability of metal alloys being the goal when using electromagnetic forming (EMF) technology, which is a high-speed processing technology that uses Lorentz force...
详细信息
In the current practical science, the accuracy in the formability of metal alloys being the goal when using electromagnetic forming (EMF) technology, which is a high-speed processing technology that uses Lorentz forces to achieve plastic deformation of sheet metal;according to the previous analysis, the results have shown that in most cases, the Lorentz force acting on the workpiece (metal) is not uniform, there are uneven axial deformations of the metal plates which prevent the rapid advancement of today’s technology. In this article, we presented some advanced analyzes which will lead us to improve the technical solution for the problems of non-uniform axial deformations of the metals in the traditional tube electromagnetic forming technology (EMF). A field shaper is used as a practical forming tool to influence the magnetic field and magnetic pressure distribution, thereby improving the forming ability and result during the electromagnetic forming (EMF) process and we see that induced eddy current control is realized by changing the structural parameters of the magnetic field shaper;which improves the strength and controllability of the magnetic force that acts on the workpiece;thereby a greater radial magnetic pressure can be achieved with field shaper than the case without it;the field shaper regulates the electromagnetic force, the distribution of the magnetic pressure decreases, and the uniform force area of the tube increases which effectively enhances the uniform range of the pipe electromagnetic bulging and the electromagnetic induction coupling between the coil and the metallic workpiece is generally required to produce the Lorentz forces. Using COMSOL Multiphysics® simulation software helped us to accurately represent the real world, simulating multiple physical effects that happened in this model during the process.
Vertical green systems (VGS) are expected to mitigate outdoor heat stress through a transpiration cooling effect. There is a lack of knowledge on how VGS influence outdoor thermal comfort, particularly focusing on ene...
详细信息
As the interest in ecosystem protection increases, many researchers are focusing on tracking flying insects to preserve biodiversity. Invasive alien species (IAS) such as Vespa velutina nigrithorax require extensive c...
As the interest in ecosystem protection increases, many researchers are focusing on tracking flying insects to preserve biodiversity. Invasive alien species (IAS) such as Vespa velutina nigrithorax require extensive consideration in this regard owing to size and weight limitations. In this paper, we propose and experimentally validate an unmanned aerial vehicle (UAV)-based trilateration system for localization and tracking of flying insects. The proposed tracking algorithm is based on the use of multiple omnidirectional antennas, and it improves the tracking accuracy and shortens the tracking time compared to those of the existing unidirectional antennas. In addition, we reduce the measurement error and noise by applying a finite impulse response (FIR) filter to the received signal strength (RSS) emitted from the radio-telemetry transmitter. A field experiment involving the proposed trilateration system was conducted in an apiary. This experiment was divided into three sub-experiments as follows: 1) behavior experiment, 2) ground truth experiment, and 3) localization and tracking experiment. The proposed system contributes to the research on UAV-based tracking systems that respond to the speed of spreading of invasive V. velutina.
Nanomechanical resonators made from van der Waals materials (vdW NMRs) provide a new tool for sensing absorbed laser power. The photothermal response of vdW NMRs, quantified from the resonant frequency shifts induced ...
详细信息
While several content management systems (CMS) and audience analytics tools are available for digital signage in the market, they are often sold separately and can be expensive. Therefore, this project aims to design ...
While several content management systems (CMS) and audience analytics tools are available for digital signage in the market, they are often sold separately and can be expensive. Therefore, this project aims to design a cost-effective and unified web-based solution for digital signage that combines content management and audience analytics functions, reducing the need for multiple purchases. This can be achieved by utilizing Raspberry Pi technology, known for its cost-effectiveness and versatility in integrations, along with a face recognition camera and machine learning methods. This proof of concept demonstrates the integration of these components to create a dynamic digital signage system. Overall, this project has the potential to offer an affordable solution for companies aiming to efficiently manage and optimize their digital marketing strategies, especially in the Digital Out-of-Home (DOOH) Advertising space.
The efficiency levels at which companies turn inputs into outputs may increase their competitive capacity. Nevertheless, in the literature, there is a lack of methods allowing evaluation of the performance of operatio...
详细信息
The increase of microplastic contamination in Vietnam is a growing concern due to various domestic, agricultural, and industrial activities. The use of plastic mulch and sludge application in agricultural farmland, te...
详细信息
Microplastics (MPs), defined as plastic particles smaller than five millimeters, are pervasive environmental pollutants affecting ecosystems from aquatic habitats to terrestrial soils. While extensive research has bee...
详细信息
Microplastics (MPs), defined as plastic particles smaller than five millimeters, are pervasive environmental pollutants affecting ecosystems from aquatic habitats to terrestrial soils. While extensive research has been conducted on MPs contamination in marine environments, the impacts of MPs in agricultural soils, particularly on plant health, remain underexplored. This review presents a comprehensive analysis of MPs contamination sources, pathways, and effects on soil properties and plant systems, focusing on MPs unique mechanisms of translocation within plants. By examining the role of MPs in disrupting soil structure, microbial communities, and plant growth, this paper identifies critical knowledge gaps and highlights the ecological risks of MPs presence in agricultural settings. Unlike prior reviews, this work provides a plant-centric perspective, addressing MPs uptake, translocation, and accumulation within plant tissues, and proposes novel mitigation strategies such as biodegradable alternatives and advancements in waste management. Furthermore, we discuss the implications of MPs interactions with heavy metals and other pollutants in soil, which may amplify toxicity in plant systems and impact overall soil fertility. This review aims to inform future research directions and policy-making efforts to mitigate the adverse effects of MPs in terrestrial ecosystems, with significant implications for agricultural productivity, soil health, and long-term food security.
暂无评论