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Topic Review
Natural Thermal Convection of Nanofluids
Nanofluids are considered as advanced heat transfer media for thermal management and conversion systems. Research on the convective heat transfer is of paramount importance for their numerous applications. This paper presents development of experimental research on the natural convection heat transfer of nanofluids in different geometries. Experimental results and available experiment-derived correlations for the natural thermal convection of nanofluids are critically analysed. Other features such as nanofluid preparation and thermophysical properties of nanofluids that are important for convection heat transfer are also briefly reviewed and discussed. It is demonstrated that there is considerable inconsistencies of available results on these properties and features of nanofluids.Although nanofluids exhibit enhanced thermophysical properties like viscosity and thermal conductivity, convective heat transfer coefficients were also observed to deteriorate in some cases when nanofluids were used, especially for higher concentration of nanoparticles (> 0.1 vol%). However, the underlying mechanisms are also not yet well-understood despite its great importance for practical applications.
  • 1.0K
  • 05 Oct 2020
Topic Review
Murano Glass
Murano glass is made on the Venetian island of Murano, which has been a glassmaking center for over 700 years. It is also sometimes referred to as Venetian glass. Today Murano is known for its art glass, but it has a long history of innovations in glassmaking in addition to its artistic fame—and was Europe's first major glassmaking center. During the 1400s, Murano glassmakers created cristallo—which was almost transparent and considered the finest glass in the world. Murano glassmakers also developed a white-colored glass (milk glass called lattimo) that looked like porcelain. They later became Europe's finest makers of mirrors. Originally, Venice was controlled by the Eastern Roman Empire, but it eventually became an independent city state. It flourished as a trading center and seaport. Its connections with the Middle East helped its glassmakers gain additional skills, as glassmaking was more advanced in countries such as Syria and Egypt. Although Venetian glassmaking existed as far back as the 8th Century, it became concentrated in Murano by law beginning 1291. Since glass factories often caught fire, this removed much of the possibility of a major fire disaster for the city. Murano glassmakers developed secret recipes and methods for making glass, and the concentration of Venice's glassmaking on the island of Murano enabled better control of those secrets. Murano became Europe's elite glassmaking center, peaking in popularity in the 15th and 16th centuries. Venice's dominance in trade along the Mediterranean Sea created a wealthy merchant class that was a strong connoisseur of the arts. This helped establish demand for art glass and more innovations. The spread of glassmaking talent in Europe eventually diminished the importance of Venice and its Murano glassmakers. A defeat by Napoleon Bonaparte in 1797, and occupation, caused more hardship for Murano's glassmaking industry. Murano glassmaking began a revival in the 1920s. Today, Murano and Venice are tourist attractions, and Murano is home to numerous glass factories and a few individual artists' studios. Its Museo del Vetro (Glass Museum) in the Palazzo Giustinian contains displays on the history of glassmaking as well as glass samples ranging from Egyptian times through the present day.
  • 1.0K
  • 14 Oct 2022
Topic Review
Radeon HD 4000 Series
The Radeon R700 is the engineering codename for a graphics processing unit series developed by Advanced Micro Devices under the ATI brand name. The foundation chip, codenamed RV770, was announced and demonstrated on June 16, 2008 as part of the FireStream 9250 and Cinema 2.0 initiative launch media event, with official release of the Radeon HD 4800 series on June 25, 2008. Other variants include enthusiast-oriented RV790, mainstream product RV730, RV740 and entry-level RV710. Its direct competition was nVidia's GeForce 200 series, which launched in the same month.
  • 1.0K
  • 09 Nov 2022
Topic Review
Ship Model Basin
A ship model basin is a basin or tank used to carry out hydrodynamic tests with ship models, for the purpose of designing a new (full sized) ship, or refining the design of a ship to improve the ship's performance at sea. It can also refer to the organization (often a company) that owns and operates such a facility. A ship model basin company is an engineering firm that acts as a contractor to the relevant shipyards, and provides hydrodynamic model tests and numerical calculations to support the design and development of ships and offshore structures.
  • 1.0K
  • 20 Oct 2022
Topic Review
Conditional Frontier Analysis (DEA)
Conditional Frontier Analysis is part of the Nonparametric Robust Estimators proposed to overcome some drawbacks in the traditional Data Envelopment Analysis (DEA) and Free Disposal Hull (FDH) measures for the technical efficiency. In special, this methodology extends the nonparametric input/output production technology to robustly account for extreme values or outliers in the data, and allow measuring the effect of external environmental variables on the efficiency of Decision Making Units (DMUs). 
  • 1.0K
  • 01 May 2021
Topic Review
Electric Vehicle Technologies
The vehicle technology is typically divided into four main categories. The sources of energy for a conventional vehicle are petrol or diesel fuel, which are the main contributors of carbon radiation in the environment. Therefore, the carbon emission rate of a hybrid is less than for conventional combustion engine vehicles. The third and fourth types are also known as zero-emission vehicles (measured at the tailpipe) which depend on the hydrogen fuel cell and battery, respectively.
  • 1.0K
  • 17 Aug 2021
Topic Review
Magnetic Polymers for Microfluidic Sorting
Magnetophoresis offers many advantages for manipulating magnetic targets in microsystems. The integration of micro-flux concentrators and micro-magnets allows achieving large field gradients and therefore large reachable magnetic forces. However, the associated fabrication techniques are often complex and costly, and besides, they put specific constraints on the geometries. Magnetic composite polymers provide a promising alternative in terms of simplicity and fabrication costs, and they open new perspectives for the microstructuring, design, and integration of magnetic functions.
  • 1.0K
  • 30 Jul 2021
Topic Review
LoRaWAN Communication Protocols
Long range wide area networks (LoRaWANs) have recently received intense scientific, research, and industrial interest. LoRaWANs play a pivotal role in Internet of Things (IoT) applications due to their capability to offer large coverage without sacrificing the energy efficiency and, thus the battery life, of end-devices. Most published contributions assume that LoRaWAN gateways (GWs) are plugged into the energy grid; thus, neglecting the network lifetime constraint due to power storage limitations. However, there are several verticals, including precision agriculture, forest protection, and others, in which it is difficult or even impossible to connect the GW to the power grid or to perform battery replacement at the end-devices. Consequently, maximizing the networks’ energy efficiency is expected to have a crucial impact on maximizing the network lifetime.
  • 1.0K
  • 10 Jun 2022
Topic Review
Scanning Electrochemical Microscopy
Scanning electrochemical microscopy (SECM) is a powerful scanning probe technique for measuring the in situ electrochemical reactions occurring at various sample interfaces, such as the liquid-liquid, solid-liquid, and liquid-gas. The tip/probe of SECM is usually an ultramicroelectrode (UME) or a nanoelectrode that can move towards or over the sample of interest controlled by a precise motor positioning system. Remarkably, electrocatalysts play a crucial role in addressing the surge in global energy consumption by providing sustainable alternative energy sources. Therefore, the precise measurement of catalytic reactions offers profound insights for designing novel catalysts as well as for enhancing their performance. SECM proves to be an excellent tool for characterization and screening catalysts as the probe can rapidly scan along one direction over the sample array containing a large number of different compositions. These features make SECM more appealing than other conventional methodologies for assessing bulk solutions. SECM can be employed for investigating numerous catalytic reactions including the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), water oxidation, glucose oxidation reaction (GOR), and CO2 reduction reaction (CO2RR) with high spatial resolution. Moreover, for improving the catalyst design, several SECM modes can be applied based on the catalytic reactions under evaluation.
  • 1.0K
  • 11 May 2021
Topic Review
Machine Learning in Agriculture
Big Data and ML have appeared as high-performance informatics technologies for creating new opportunities to unravel, quantify and understand data-intensive processes in the environment of farm operations
  • 1.0K
  • 11 Mar 2021
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