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Topic Review
Biography
Topic Review
Nemesis
Nemesis is a hypothesized companion object orbiting the Sun, motivated by the claim of a terrestrial extinction periodicity. Astronomer Percival Lowell in 1915 thought that some glitches in the orbit of Uranus might be caused by what he dubbed Planet X, and led to the discovery of Pluto in 1930. The existence of the object beyond Pluto may be able to explain the architecture of the Edgeworth–Kuiper Belt and a secular perihelion precession of Saturn. The Nemesis hypothesis has also been used to explain the measurements of the ages of 155 lunar spherules from the Apollo 14 site.
182
14 Jan 2024
Topic Review
Colloids in Curved Space
Self-assembly of nanoscale objects is of essential importance in materials science, condensed matter physics, and biophysics. Curvature modifies the principles and sequence of self-assembly in Euclidean space, resulting in unique and more complex structures. Understanding self-assembly behavior in curved space is not only instrumental for designing structural building blocks and assembly processes from a bottom-up perspective but is also critically important for delineating various biological systems.
150
11 Jan 2024
Topic Review
Neuromorphic Photonic Integrated Circuits
Neuromorphic photonics is a cutting-edge fusion of neuroscience-inspired computing and photonics technology to overcome the constraints of conventional computing architectures. Its significance lies in the potential to transform information processing by mimicking the parallelism and efficiency of the human brain. Using optics and photonics principles, neuromorphic devices can execute intricate computations swiftly and with impressive energy efficiency. This innovation holds promise for advancing artificial intelligence and machine learning while addressing the limitations of traditional silicon-based computing.
211
10 Jan 2024
Topic Review
Gloss Measurements
The appearance of a surface depends on four main appearance attributes, namely color, gloss, texture, and translucency. Gloss is an important attribute that people use to understand surface appearance, right after color.
121
03 Jan 2024
Topic Review
Types of Liquid Crystal Biosensors
Interactions between liquid crystal molecules and target analytes open up various biosensing applications for quick screening and point-of-care applications. There exist different kinds of biosensors, such as electrochemical, wearable, amperometric, potentiometric, optical, impedimetric and thermometric. Liquid crystal (LC) biosensors belong to the type of optical biosensors, which employ its anisotropy and sensitivity to external stimuli. As it is known, LCs are highly sensitive to environment changes, e.g., temperature, electric fields and surface interactions. The inherent property of LCs to respond to external stimuli gives LC biosensors a high potential to contribute to the new biosensing era.
496
02 Jan 2024
Topic Review
Wavefront Sensors and Aberration Sensors in Ophthalmology
The wavefront sensor is one of the main elements of the adaptive vision correction system. Its task is to measure the aberrations of the wavefront and transmit the results of these measurements to the processing device. The main causes of wavefront aberrations in the eye are the shape and optical properties of the cornea, pupil and lens. In modern diagnostic devices, wave aberrations are described in terms of Zernike polynomials (OSA and ANSI standards). Nowadays, there are a wide variety of wavefront sensors.
165
02 Jan 2024
Topic Review
Liquid Crystal Lenses
Liquid crystal (LC) lenses may be used by themselves or as a supplement of glass lenses, e.g., to tune up the power of the glass lens within a certain range, with functionality equivalent to commercial progressive lenses, but with improved performance since the power of the whole lens is modified by a sensor providing autofocus, as in digital cameras.
272
29 Dec 2023
Topic Review
Detection System for DDoS Attacks
Distributed Denial of Service (DDoS) attacks, advanced persistent threats, and malware actively compromise the availability and security of Internet services. A DDoS attack is a vindictive attempt from numerous frameworks to make PC/network assets inaccessible to its expected clients, more often than not, by blocking/interrupting services associated with the organization of the network/Internet.
225
29 Dec 2023
Topic Review
Chemiluminescence Measurements of Premixed Flames Applying Abel Transform
The temperature field and chemiluminescence measurements of axisymmetric flame are obtained simultaneously in only one image. Digital Laser Speckle Displacement measures temperature fields, and direct image flame determines chemiluminescence values. Applying the Abel transform of axisymmetric objects for volume visualization requires smooth intensity profiles. Due to the nature of the experimental setup, direct image flame is corrupted with speckle noise and a crosstalk effect. These undesirable effects deteriorate the measurement results. Then, experimental data need crosstalk correction and speckle noise reduction to improve the measurements.
256
29 Dec 2023
Topic Review
Silicon and Silicon Carbide Recrystallization by Laser Annealing
Modifying material properties within a specific spatial region is a pivotal stage in the fabrication of microelectronic devices. Laser annealing emerges as a compelling technology, offering precise control over the crystalline structure of semiconductor materials and facilitating the activation of doping ions in localized regions. This obviates the necessity for annealing the entire wafer or device.
220
29 Dec 2023
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