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Topic Review
Analysis of Tehran’s Air Pollution
Air pollution is one of the major issues in urban management. Researchers proposes a simulated model of the pollution level of the capital city of Tehran along with its source and outcomes based on system dynamics. 
  • 627
  • 28 Jan 2022
Topic Review
Multi-Granularity Process Analytics
Data can be aggregated to lower resolution representations according to a certain rational or optimality criterion in a certain pre-defined sense. In this situation, partial information from all observations is retained and at the same time the amount of data analysed is greatly reduced. The level of resolution or granularity adopted may be different for each variable under analysis. Methods for dealing with these data structures are called multiresolution or multi-granularity, and are newcomers to the Process Analytical toolkit.
  • 626
  • 22 Dec 2021
Topic Review
Alluvial Gold Mining Technologies
Gold has been a highly prized commodity throughout history and has played a significant role in humanity’s economic and cultural progress.
  • 617
  • 25 Oct 2023
Topic Review
Fused Deposition Modeling of 3D Printed Part 
Fused deposition modeling (FDM) is the most economical additive manufacturing (AM) technology available for fabricating complex part geometries. Dimensional instabilities are challenges of FDM that depends on printing parameters. The selected printing parameters include layer height, number of perimeters, infill density, infill angle, print speed, nozzle temperature, bed temperature, and print orientation. Three-level definitive screening design (DSD) was used to plan experimental runs. 
  • 611
  • 26 Sep 2022
Topic Review
Performance and Efficiency of Cross-Flow Fans
Cross-Flow Fans (CFFs) have been widely applied in the automotive and domestic air conditioning industries in recent decades. They are high-pressure coefficient turbomachines compacted diametrically, and thus, the complex interactions of these fans require thorough evaluation. Their innovation has opened up new directions in turbomachinery, and both academic research and industry have seen numerous efforts to develop these types of fans. Despite extensive work, optimizing and improving their performance remains a challenge. Enhancing their efficiency necessitates improvements in structural characteristics, aerodynamic features, and acoustic properties.
  • 605
  • 19 Dec 2023
Topic Review
Properties of HVOF-PVD Duplex Coatings
The morphology (surface and cross-section) of the high-velocity oxygen–fuel coupled physical vapor deposition (HVOF-PVD)  duplex coating and its mechanical (stress and load-bearing capacity), tribological (wear and lubrication), and corrosion (chemical and electrochemical) behavior are described and discussed for surface protective concern. The duplex coating involves a combination of a thick, hard HVOF bottom layer and a thin, hard yet tough PVD top layer. The hardness and modulus of the HVOF coating are between those of the soft substrate and the hard PVD coating, which thereafter provides a smooth transition and effective support between them. As a result, the HVOF interlayer can eliminate the plastic deformation of the substrate due to stress concentration under heavy load, effectively avoiding the “eggshell effect”. As expected, the duplex coating system would provide excellent load-bearing capacity. In terms of tribology, the wear resistance of the HVOF-PVD duplex coating is significantly improved compared to that of PVD monolayer coating. 
  • 604
  • 03 Nov 2022
Topic Review
Mining Equipment Management
Mining sector is an economic foundation and the main source of national wealth for many countries. Modern mining operations are ever more reliant on efficient usage of costly large-scale mining equipment (e.g., trucks, shovels/excavators/loaders, conveyors and crushers). Thus, mining equipment management is becoming crucial for the mining industry. To be viable and sustainable, mining enterprises need to operate different types of mining equipment units at various stages with the objective of minimizing the total cost or maximizing the whole productivity.
  • 604
  • 23 Dec 2022
Topic Review
Enzymes for Lignin Depolymerization
Lignin, a rigid polymer composed of phenolic subunits with high molecular weight and complex structure, ranks behind only cellulose in the contribution to the biomass of plants. Therefore, lignin can be used as a new environmentally friendly resource for the industrial production of a variety of polymers, dyes and adhesives. Since laccase was found to be able to degrade lignin, increasing attention had been paid to the valorization of lignin. The enzymes involved in lignin depolymerization are mainly divided into four categories: laccase, lignin peroxidase (LiP), manganese peroxidase (MnP) and versatile peroxidase (VP).
  • 600
  • 05 Aug 2022
Topic Review
Performance Assessment of Offshore Oil and Gas Platforms
Within the oil and gas (O&G) production and drilling processes of today, there are challenges in maintaining the system for numerous reasons, ranging from international competition to market globalization, regulatory compliance, and the complexity brought by technological advancement. Furthermore, with the inflating maintenance costs and increasing failure frequency impacting production safety, the issue of non-sustainability in O&G companies is made worse by surplus or inefficient maintenance. Thus, maintenance has direct sustainability-related impacts regarding social importance, influence on energy demand, exploiting physical resources, and environmental pollution. Since the performance and competitiveness of an industry are affected by reliability and environmental safety, it has become important to find a practical approach for sustainability and integrate it into maintenance processes.
  • 598
  • 10 Feb 2022
Topic Review
Occurrence of Bearing Currents in Electric Machines
In electrical machines, there are numerous negative phenomena of a destructive nature. The constructors of electrical machines try to limit these phenomena and/or minimize their negative effects. One such phenomenon in electrical machines is the occurrence of bearing voltages and currents. Despite their simple structure, the bearings are susceptible to damage to the raceway surface and rolling elements. Even small traces and imperfections of these surfaces may cause a serious failure resulting in the bearing being excluded from further operation.
  • 597
  • 11 Jul 2022
Topic Review
Achieving Sustainability in Solar Energy Firms in Turkey
Lean principles and sustainability are considered important terms in business. Solar firms are witnessing great competition to fulfill energy requirements, suffering from a huge amount of waste, negatively affecting the sustainability dimensions. Thus, the aim of the study is to build a framework for solar energy firms to achieve sustainability through adopting lean principles, which will help to fix many problems as waste and costs. The method included reviewing the literature to explore the founding of the relation between the two terms, and using a questionnaire that was directed to the responsible people in Turkish solar energy firms. The results of the survey were analyzed to: (1) Find out what the responsible people think about the two terms lean and sustainability; (2) Measure the probable relationship between lean principles and sustainability dimensions by applying a linear regression test; (3) Use the results of point number two to build the framework. The result showed there was a high level of relative importance about the two terms from the point of view of managers and experts in solar firms. In addition, the study found a relationship between adopting pull and flow principles of lean, and achieving economic and social dimensions of sustainability, this finding is represented in a framework. 
  • 595
  • 19 Jan 2022
Topic Review
Digital Twins in the Agri-Food Supply Chain
Digital twins have the potential to significantly improve the efficiency and sustainability of the agri-food supply chain by providing visibility, reducing bottlenecks, planning for contingencies, and improving existing processes and resources. Additionally, they can add value to businesses by lowering costs and boosting customer satisfaction.
  • 581
  • 03 Jul 2023
Topic Review
Cartridge (Respirator)
}} A respirator cartridge or canister is a container that cleans pollution from air. Employees working in a polluted atmosphere use respirators for health preservation. If the air in the workplace is polluted with noxious gases, but contains a lot of oxygen they often use air-purifying respirators (APR). These respirators provide employees breathable air by removing pollution from ambient air using canisters or cartridges. There are cartridges of different types, and they must be chosen correctly and replaced in a timely manner.
  • 580
  • 16 Nov 2022
Topic Review
Consequences of COVID-19 on Health, Economy, and Tourism
This is an explanation of COVID-19 impacts on the aspects of health, economy, and tourism, focusing on Asia. The consequences and the main concerned direct and indirect stakeholders has been presented. In addition, the connection between the three aspects based on the impact of COVID-19, which still continues to intensify, and strategies to prepare for the future pandemic situations are also described.
  • 571
  • 29 Apr 2022
Topic Review
Hyperloop Academic Research
Hyperloop is a proposed very high-speed ground transportation system for both passenger and freight that has the potential to be revolutionary, and which has attracted much attention in the last few years. The concept was introduced in its modern form relatively recently, yet substantial progress has been made in the past years, with research and development taking place globally, from several Hyperloop companies and academics. 
  • 567
  • 05 Jul 2021
Topic Review
Non-Thermal Technologies for Wine Production
In winemaking, sulfur dioxide (SO2) is often used at different stages in the production process (e.g., after harvesting the fruit, after crushing, added to the must before fermentation, before maturation, before bottling). SO2 has the ability to control oxidative processes including polyphenol oxidase and to inhibit Maillard reactions. If left untreated, oxidation can lead to a decrease in the sensorial and nutritional quality of wine.  The use of non-thermal or cold pasteurization technologies for wine preservation was reviewed. The effect of pulsed electric fields (PEF), high pressure processing (HPP), power ultrasound (US), ultraviolet irradiation (UV), high pressure homogenization (HPH), filtration and low electric current (LEC) on wine quality and microbial inactivation was explored and the technologies were compared
  • 561
  • 29 Sep 2021
Topic Review
Circular Economy, Industry 4.0 and Supply Chain
The vertical disintegration of companies has increased the complexity of management in terms of time and quality and increased uncertainty in the markets, making it impossible today for companies to compete effectively if they are isolated from their suppliers and other stakeholders. In this context, adopting the concept of supply chains (SCs) is increasingly essential for a company’s performance. Moreover, two themes are being increasingly discussed in the context of SCs, the circular economy (CE) and Industry 4.0 (I4.0). The CE paradigm consists of a possible way to achieve environmental objectives and economic sustainability by developing systemic changes that go beyond the individual company and involve the other actors in the SC, contributing to adding value to a product and/or service
  • 559
  • 26 May 2022
Topic Review
Factors Influencing Community Health Workers’ Preparedness for ICT
Globally, community health workers (CHWs) are increasingly viewed as an integral part of the health system as opposed to simply being an extension of it. Given this view, most low- or middle-income countries (LMICs) have refocused their efforts on reorganising CHW initiatives to maximise their impact. In 2011, the South African Department of Health formally integrated community health workers (CHWs) into the national health system to strengthen primary healthcare delivery following the Universal Health Coverage (UHC) principles and the South African National Development Plan 2030. Several studies have found that most CHWs are comfortable providing clinical treatment but are unsure how to translate epidemiological and socio-demographic data into relevant information for service delivery. Information and communication technology (ICT) provides a viable mechanism for assisting CHWs with information appropriation.
  • 559
  • 29 Jan 2023
Topic Review
Green Closed-Loop Supply Chain Response to Carbon Policies
As greenhouse gas (GHG) emissions continue to increase, governments throughout the world are under increasing pressure to enact legislation restricting emissions and implement environmental measures, such as the Kyoto Protocol and the European Union Emission Trading System.
  • 553
  • 26 Mar 2024
Topic Review
Mechanical Properties of WSF Sandwich Composite Plate
The woven spacer fabric (WSF) sandwich composite plate is mainly used in carriages, construction materials, shock absorbers, wind-turbine blades, etc., which require WSF sandwich composite plates with bending, compression, impact, shear, and peel performance. These properties are reviewed herein. More attention will be paid to mechanical research of WSF sandwich composite panels should use non-destructive testing technology.
  • 552
  • 20 Sep 2022
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