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Topic Review
A Unified Treatment of Tribo-Components Degradation
According to the degradation-entropy generation (DEG) theorem, material degradation is irreversible and always accompanied by entropy generation. When applied to the degradation of a tribo-component, the DEG theorem relates the rate of change in wear volume to thermodynamic force via a parameter known as the degradation coefficient B. The efficacy of the B over the well-established Archard coefficient has been experimentally demonstrated for tribo-components that experience wear under running-in and steady-state operating conditions. The steady wear includes uni-directional, bi-directional, uniform, and variable operating conditions.
  • 607
  • 12 Nov 2021
Topic Review
A Unique Marine-Derived Collagen
To provide the conditions for the mechanical and structural properties needed for the restored tissue and its appropriate functioning, the scaffold requires specific biochemical properties in order to ensure a correct healing process. The scaffold creates a support system and requires a suitable material that will transduce the appropriate signals for the regenerative process to take place. A scaffold composed of material that mimics natural tissue, rather than a synthetic material, will achieve better results.
  • 583
  • 30 Aug 2021
Topic Review
A Vision-Based Micro-Manipulation System
Micro-manipulation systems play a critical role in various scientific and industrial applications, enabling precise handling and control of microscopic objects. Precise micro-manipulation is essential, whether it involves the assembly of microelectronic components, the handling of biological samples, or the fabrication of micro-scale structures. However, achieving accurate manipulation at the micro-scale poses unique challenges, primarily due to the minuscule size of the objects involved.
  • 204
  • 27 Dec 2023
Topic Review
AA 6061 Metal Matrix Composites
AA 6061 is an aluminium alloy that has extensive applications due to its superior material characteristics. It is a popular choice of matrix for aluminium matrix composite (AMC) fabrication. Stir casting method is widely for fabricating AA 6061 composites with reinforcements such as SiC, B4C, Al2O3, TiC, other inorganic, organic, hybrid and nanomaterials. An increase in reinforcement content enhances the mechanical and tribological properties of the composites. Hybrid composites show better material properties than single reinforcement composites. 
  • 1.2K
  • 07 May 2021
Topic Review
AAUSAT3
AAUSAT3 is the third CubeSat built and operated by students from the Aalborg University in Denmark . It was launched on 25 February 2013 from the Satish Dhawan Space Centre in India on a PSLV rocket (number C20). AAUSAT3 carries two AIS receivers as the main payload.
  • 312
  • 17 Oct 2022
Topic Review
Abdominal Exercise
Abdominal exercises are type of strength exercise those that affect the abdominal muscles (colloquially known as the stomach muscles or "abs").
  • 301
  • 04 Nov 2022
Topic Review
Abiotic and Biotic Polymer Degradation Mechanisms
Polymer degradation is defined as an irreversible change of the chemical structure, physical properties, and visual appearance due to the chemical cleavage of the polymer’s constitutive macromolecules by one or more mechanism. More than one mechanism can simultaneously take place due to the action of external factors, and one mechanism can be more dominant than others at any time. External factors associated with the environment, such as heat, humidity, radiation, and acidic or alkaline conditions, could modify the degradation process and its rate. The degradation process can alter polymer properties such as mechanical, optical, electrical, discoloration, phase separation or delamination, erosion, cracking, and crazing. The four main abiotic mechanisms associated with polymer degradation are mechanical, thermal (or thermo-oxidative), photo (photo-oxidative), and hydrolytic (chemical) degradation, some of which can be assisted by catalysis. In addition, ozone degradation (chemical) is considered a mechanism of degradation for polymers but is less common. The biotic degradation involves the action of microorganisms by enzymatic action.
  • 2.5K
  • 27 Oct 2022
Topic Review
Abnormal Operating Conditions of Oil-Immersed Large Power Transformers
Large power transformers (LPT) are custom-built pieces of equipment that are crucial links to the bulk transmission grid. Usually, they link a generator-transmission line and/or linking lines of different voltages. It is essential for large power transformers to understand which condition of their components indicates an abnormal operation.
  • 1.6K
  • 12 Jul 2022
Topic Review
Abrasive Water-Jet Machining
Abrasive water jet machining (AWJM) is a very useful non-conventional machining for the cutting of dissimilar materials at once. It is a flexible process that generates low thermal damage to the machined surface as there is no continuous tool-material con- tact along the machining process. Compared to conventional processes such as milling, abrasive particles are used in water jet machining. These particles have cutting edges that allow the machining of the material by overlapping of small impacts that deform the material. At each instant, a quantity of abrasive particles travels in the water jet in order to perform the cut.
  • 10.6K
  • 24 Feb 2021
Topic Review
Abrasive Waterjet Machining
Abrasive Waterjet Machining (AWJM) is considered a viable alternative to conventional machining processes, due to its capability of rendering even complex features on parts with high productivity. However, it is currently also important for manufacturing processes to comply with the various aspects of sustainability, by putting emphasis on the environmental dimension apart from the economic. Although AWJM generally is considered an inherently environmentally friendly process, it is required that thorough experimental studies be carried out to evaluate the sustainability of AWJM under various conditions. 
  • 809
  • 14 Aug 2021
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