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Topic Review
Sound Trap
A sound trap, also known as a duct silencer, sound attenuator, or muffler, is a special acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces. In its simplest form, a sound trap consists of an baffle within the ductwork. These baffles often contain sound-absorbing materials. The physical dimensions and baffle configuration of sound traps are selected to attenuate a specific range of frequencies. Unlike conventional internally-lined ductwork, which is only effective at attenuating mid- and high-frequency noise, sound traps can achieve broader band attenuation in relatively short lengths. Certain types of sound traps are essentially a Helmholtz resonator used as a passive noise-control device.
  • 1.1K
  • 25 Oct 2022
Biography
William Friese-Greene
William Friese-Greene (born William Edward Green, 7 September 1855 – 5 May 1921) was a prolific English inventor and professional photographer. He is principally known as a pioneer in the field of motion pictures, creating a series of cameras in the period 1888–1891 with which he shot moving pictures in London. He went on to patent an early two-colour filming process in 1905. His inventions
  • 1.1K
  • 02 Dec 2022
Topic Review
Recycled Asphalt Mixtures with Rejuvenators
Rejuvenating agents are materials with certain physical and chemical attributes that may be incorporated into mixtures with high oxidisation level or high RAP content. Studies pertaining to rejuvenators can be traced as far as in the late 1970s. The ASTM D4552 was initiated based on the six grades of rejuvenating agents measured based on viscosity at 60 °C, so as to facilitate the selection of rejuvenators in ensuring good performance in the long run. Martin et al. divided rejuvenators into five general categories, namely: Paraffinic oils, Aromatic extracts, Naphthenic oils, Triglycerides & Fatty Acids, and Tall oils. Based on the chemical composition of asphalt and rejuvenators, Tabatabaee and Kurth classified the latter into three classes; insoluble and soluble softeners, as well as compatibilisers. Insoluble softeners have desirable effects on the rheological attributes of aged asphalt but portray durability and instability issues in the long run. Next, soluble softeners display better compatibility with naphthenic aromatic asphalt that has low polarity. Meanwhile, compatibilisers share some similarities with other numerous fractions found in asphalt.
  • 1.1K
  • 23 Aug 2021
Topic Review
Optical Fiber Cable
An optical fiber cable, also known as a fiber optic cable, is an assembly similar to an electrical cable, but containing one or more optical fibers that are used to carry light. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable will be deployed. Different types of cable are used for different applications, for example long distance telecommunication, or providing a high-speed data connection between different parts of a building.
  • 1.1K
  • 01 Nov 2022
Topic Review
3D Printing of Pure Copper Functional Structures
The 3D printing of pure copper to sufficiently high densities has finally taken off, due to the emergence of commercial-grade printers which are now equipped with 1 kW high-power lasers or short-wavelength lasers.
  • 1.1K
  • 24 Oct 2023
Topic Review
Cooling Integrated, Solid Desiccant Systems
Compared with the traditional vapor-compression cooling system, the solid desiccant evaporative cooling system consumes less electricity, has no harmful refrigerant, controls air humidity effectively and maintains a high level of air quality. The hybrid system usually includes two main processes: the dehumidification process and the evaporative cooling process. The function of the dehumidification process is to remove the moisture, and the evaporative cooling process is responsible for handling the sensible heat of the air.
  • 1.1K
  • 13 Oct 2021
Topic Review
Visualization Techniques in Building Energy Simulation and Monitoring
Data visualization has become relevant in the framework of the evolution of big data analysis. Being able to understand data collected in a dynamic, interactive, and personalized way allows for better decisions to be made when optimizing and improving performance. Although its importance is known, there is a gap in the research regarding its design, choice criteria, and uses in the field of building energy consumption. Therefore, the state-of-the-art of visualization techniques used in the field of energy performance, in particular by considering two types of building analysis: simulation and monitoring are discussed. Likewise, data visualizations are categorized according to goals, level of detail and target users. Visualization tools published in the scientific literature, as well as those currently used in the IoT platforms and visualization software, were analyzed. The overview can be used as a starting point when choosing the most efficient data visualization for a specific type of building energy analysis.
  • 1.1K
  • 09 Mar 2023
Topic Review
Smart Cities and Autonomous Vehicles
Smart cities aim to integrate technological development with different functions/components such as mobility, management of energy, natural resources, water, and the waste cycle, air quality, land use, service network, construction, but also the economy, social participation, increased employment, and citizen safety. It includes a series of coordinated and integrated social, environmental and economic interventions to enhance human capital, reduce environmental impacts and solve ecological emergencies. The holistic approach is particular to smart cities, including several mobility aspects in the main European classifications. In particular, the development of smart cities depends on several factors related to transport supply (i.e., mobility service, infrastructure details, ICT) and demand (socio-demographic aspects), and the size of the city. 
  • 1.1K
  • 05 Aug 2021
Topic Review
Extra (Acting)
A background actor or extra is a performer in a film, television show, stage, musical, opera or ballet production, who appears in a nonspeaking or nonsinging (silent) capacity, usually in the background (for example, in an audience or busy street scene). War films and epic films often employ background actors in large numbers: some films have featured hundreds or even thousands of paid background actors as cast members (hence the term "cast of thousands"). Likewise, grand opera can involve many background actors appearing in spectacular productions. On a film or TV set, background actors are usually referred to as "junior artist", "atmosphere", "background talent", "background performers", "background artists", "background cast members" or simply "background", while the term "extra" is rarely used. In a stage production, background actors are commonly referred to as "supernumeraries". In opera and ballet, they are called either "extras" or "supers".
  • 1.1K
  • 04 Nov 2022
Topic Review
Nanotechnology
Nanotechnology is opening new therapeutic possibilities of fighting against COVID-19 by enabling new prevention, diagnosis, drug delivery, and treatment methods. Nanomedicine is known as the branch of medicine involved in preventing and curing various diseases using nanoscale materials, such as biocompatible nanoparticles and nanorobots, for various applications, including diagnosis, delivery, and sensing. In addition, nanomedicines have exhibited important features, such as efficient transport through fine capillary blood vessels and lymphatic endothelium, longer circulation duration and blood concentration, higher binding capacity to biomolecules such as endogenous compounds including proteins, higher accumulation in target tissues, reduced inflammatory or immune responses, and oxidative stress in tissues.
  • 1.1K
  • 09 May 2024
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