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Topic Review
Heckler & Koch HK69A1
The HK69A1 is a 40 mm grenade launcher developed and produced by the German arms manufacturer Heckler & Koch (H&K). The weapon was designed to engage enemy troops and strongpoints out to a distance of 350 m; it can also be used to deploy smoke grenades and illumination flares.
  • 833
  • 05 Nov 2022
Topic Review
Carbon Nanotubes in Nanocomposite Mixed-Matrix Membranes
Carbon nanotubes (CNTs) are a popular material for gas separation because their walls are naturally smooth, allowing for faster gas transit than other inorganic fillers. It also has excellent mechanical strength, allowing membranes to work under high pressure. Although CNTs have superior qualities to other inorganic fillers, incorporating them into a polymer matrix is difficult due to CNTs' strong van der Waals forces, which cause agglomeration. CNT dispersion must be addressed if the full potential of CNTs is to be realized.
  • 833
  • 17 Jun 2022
Topic Review
GHDs with Solar Technologies
Greenhouse dryers (GHDs) are simple facilities that can provide large capacities for drying agricultural products. The solar GHDs (SGHDs) are classified as passive and active systems. The passive SGHDs have a heat transfer through natural convection, whereas, SGHDs having a heat transfer through forced convection are called active dryers. Active SGHDs can be integrated with different solar technologies, including photovoltaic (PV), photovoltaic-thermal (PVT), and solar thermal collectors. Additionally, solar-assisted greenhouse dryers (SGHDs) can be integrated with heat pumps and thermal energy storage (TES) units and presented in hybrid configuration considering their integration with other renewable energy sources with the aim of improving the thermal performance.
  • 833
  • 01 Jul 2021
Topic Review
Edge Computing in Manufacturing Industry
The primary goal of edge computing (EC) is to reduce the time required to transfer large amounts of data. With the ability to analyze data at the edge, it is possible to obtain immediate feedback and use it in the decision-making process. However, the implementation of EC requires investments not only in infrastructure, but also in the development of employee knowledge related to modern computing methods based on artificial intelligence. Future research in EC should particularly cover areas where actions require immediate decision making and the processing of big data, such as autonomous control of robots, vehicles, or entire factories. The second area of research should be technologies related to mobile edge computing, for example, telecommunications and all issues related to 5G technology.
  • 833
  • 11 Apr 2022
Topic Review
The Importance of Alternative Materials for Building Construction
The escalating demand for natural resources within the construction industry is progressing upward. At the same time, however, there is a great concern regarding the depletion of these resources. On the one hand, the depletion of primary sources of natural sand worldwide, combined with environmental and ecological concerns, drives the adoption of alternative aggregate materials for sustainable concrete construction. On the other hand, stone dust, a waste from the quarrying industry, offers a cost-effective and practical solution for producing concrete. 
  • 832
  • 29 Aug 2023
Topic Review
Hydroxyapatite in Oral Care Products
Calcium phosphate compounds form the inorganic phases of our mineralised tissues such as bone and teeth, playing an important role in hard tissue engineering and regenerative medicine. In dentistry and oral care products, hydroxyapatite (HA) is a stable and biocompatible calcium phosphate with low solubility being used for various applications such as tooth remineralisation, reduction of tooth sensitivity, oral biofilm control, and tooth whitening. 
  • 832
  • 08 Sep 2021
Topic Review
Renewable Energy and Sustainability
One of the most effective ways to achieve sustainability targets is to use renewable energy sources, such as wind, solar, biomass, biodiesel, ethanol, hydroelectric, and also tidal, since they contribute to reduce energy dependence on fossil fuels, reduce greenhouse gas (GHG) emissions, reduce environmental pollution, and improve the efficiency of the electrical grid.
  • 832
  • 25 Aug 2020
Topic Review
Drone-Based Package Delivery Logistics Systems
Autonomous Drone Delivery (ADD) modes are expected to become an important pillar of the future logistics industry for small parcel delivery at the last mile, as well as meal delivery service for fast food (e.g., pizza, etc.) and restaurants.
  • 832
  • 19 Apr 2022
Topic Review
Laser Wakefield Electron Acceleration
Laser wakefield electron acceleration (LWFA) is an emerging technology for the next generation of electron accelerators. As intense laser technology has rapidly developed, LWFA has overcome its limitations and has proven its possibilities to facilitate compact high-energy electron beams.
  • 831
  • 30 Jun 2021
Topic Review
Speckle Imaging
Speckle imaging describes a range of high-resolution astronomical imaging techniques based on the analysis of large numbers of short exposures that freeze the variation of atmospheric turbulence. They can be divided into the shift-and-add ("image stacking") method and the speckle interferometry methods. These techniques can dramatically increase the resolution of ground-based telescopes, but are limited to bright targets.
  • 831
  • 22 Nov 2022
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