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Topic Review
A Labile Metallo-Porphyrin as Tool to Control J-Aggregates Chiroptical Properties
The zinc(II) metal derivative of 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS4) is quite labile and readily demetallates under acidic conditions, affording the parent diacid porphyrin in a monomeric form. The rate of this process is first order on [ZnTPPS4] and second order on [H+], allowing a precise control of the monomer release in solution. Under high ionic strength, this latter species is able to self-assemble into J-aggregates, whose kinetics of growth are largely modulated by pH. The aggregation kinetics have been treated according to a well-established model, in which the formation of an initial nucleus is the rate determining step preceding the autocatalytic growth of the whole assembly. The extinction spectra of the aggregates suggest the occurrence of a dipolar coupling mechanism very similar to that operating in metal nanoparticles. Spontaneous symmetry breaking takes place in these aggregates as evidenced by unusual circular dichroism spectra. The intensity and sign of the effect is controlled by the aggregation rate and therefore can be tuned through a proper choice of initial conditions.
  • 1.2K
  • 15 Jul 2020
Topic Review
A Lean-Led Design Approach
Lean-led Design is a  user-empowering approach that gained popularity in some countries such as the USA. It is proposed to be used during the project definition of healthcare projects in order to enhance quality of healthcare and optimize pathways that patients could follow.
  • 934
  • 06 Apr 2022
Topic Review
A Light-Electric-Vehicle Batteries Maintenance Tool
This work proposes an open-hardware low-cost battery maintenance tool architecture that can be used with common laboratory instruments. The tool is based on a relay matrix and a battery monitor integrated circuit. It is able to completely characterize and optimize the state of a battery independently of the battery management system and also gives a figure of the individual aging of the battery cells. The work shows the architecture and the experimental validation of a 16-cells battery maintenance tool prototype. The results demonstrate that utilizing the tool brings the battery to the best possible state and identifies the degradation of the cells in terms of capacity and resistance.
  • 463
  • 12 Nov 2021
Topic Review
A Lightweight Double-Stage Scheme to Identify Malicious DNS
The Domain Name System (DNS) protocol essentially translates domain names to IP addresses, enabling browsers to load and utilize Internet resources. Despite its major role, DNS is vulnerable to various security loopholes that attackers have continually abused.
  • 313
  • 04 Dec 2023
Topic Review
A Lightweight Object Detection Network with Attention Modules
Object detection methods based on deep learning typically require devices with ample computing capabilities, which limits their deployment in restricted environments such as those with embedded devices.
  • 192
  • 22 Nov 2023
Topic Review
A Lightweight Remote Sensing Aircraft Object Detection Network
Remote sensing aircraft object detection is crucial in various applications. In civil aviation and the aerospace industry, it helps identify other aircraft, drones, or obstacles around an aircraft to prevent collisions and enhance aviation safety. It also aids in the real-time monitoring and tracking of civil aviation flights, cargo planes, and private aircrafts to ensure their flight path and status.
  • 214
  • 13 Mar 2024
Topic Review
A Lightweight UAV SLAM System
Unmanned aerial vehicles (UAVs) can experience significant performance issues during flight due to heavy CPU load, affecting their flight capabilities, communication, and endurance.
  • 327
  • 09 Jun 2023
Topic Review
A Long-Lasting PARP1-Activation Mediates Signal-Induced Gene Expression
PolyADP-ribosylation is an evolutionary conserved, reversible post-translational modification of proteins. Numerous nuclear proteins act as substrates of the abundant nuclear polyADP-ribose polymerase 1 (PARP1). In this modification, negatively charged ADP-ribose chains constructed on chromatin-bound proteins, cause their repulsion from the negatively charged DNA. In accordance, polyADP-ribosylation is a post-translational modification of proteins that causes relaxation of the highly condensed structure of the chromatin. Histone H1, which is bound to the linker DNA, located between the nucleosomes, is a prominent substrate of PARP1.
  • 823
  • 19 May 2022
Topic Review
A Low-Cost, Flexible Pressure Capacitor Sensor using Polyurethane for Wireless Vehicle Detection
Detection of vehicles on the road can contribute to the establishment of an intelligent transportation management system to allow smooth transportation and the reduction of road accidents. Thus far, an efficient and low-cost polymer flexible pressure sensor for vehicle detection is lacking. This paper presents a flexible sensor for vehicle sensing and demonstrates a wireless system for monitoring vehicles on the road. A vehicle sensor is fabricated by sandwiching a polyurethane material between Aluminum top/bottom electrodes. The sensing mechanism is based on changes in capacitance due to variation in the distance between the two electrodes at an applied external pressure. A clear response against a pressure load of 0.65 Mpa is observed, which is the same pressure as that of the car tire area in contact with the road. Significantly, the sensor is easy to embed on the road line due to its mechanical flexibility and large size. A field test is carried out by embedding the sensor on the road and crossing the sensor with a car. Moreover, the signal displayed on the tablet indicates that the sensing system can be used for wireless detection of the axle, speed, or weight of the vehicle on the road. The findings suggest that the flexible pressure sensor is a promising tool for use as a low-cost vehicle detector in future intelligent transportation management.
  • 2.1K
  • 28 Oct 2020
Topic Review
A Machine Learning-Based Sustainable University Field Training Framework
The proposed sustainable University Field Training (SUNFIT) is an educational data mining framework based on the pedagogical strategies of preparing, conducting, and assessing computing students’ skills in courses involving practical industry engagement.
  • 356
  • 29 May 2023
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