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Topic Review
Plasan Sand Cat
The SandCat (Hebrew: פלסן קרקל‎) is a composite armored vehicle designed by the then Plasan Sasa (now Plasan) of Israel. The SandCat, which is presented as a single bi-capitalized word, was shown publicly for the first time at AUSA during October 2005. The latest models were shown for the first time at Eurosatory 2018. The SandCat is based on a commercial Ford F-Series chassis. Approximately 700 SandCats have been produced since 2004, and while Plasan has never released complete details, these are known to be in service with at least 16 users across five continents, and in a wide variety of roles that range from Police/internal security to combat/patrol.
  • 924
  • 15 Nov 2022
Topic Review
Warp-Field Experiments
Warp-field experiments are a series of current and proposed experiments to create and detect instances of spacetime warping. The ultimate goal is to prove or disprove the possibility of spacetime metric engineering with reasonable amounts of energy.
  • 923
  • 14 Oct 2022
Topic Review
Cohesive Sediment Transport in River Systems
Mathematical modelling of cohesive sediment transport is a challenge because of the large number of governing parameters controlling the transport processes. These parameters have to be determined using a rotating circular flume for site specific sediments. The parameters that that need to be determined using a rotating circular flume during the application of the RIVFLOC model to different river systems include the critical shear stress for erosion of the cohesive sediment, critical shear stress for deposition according to the definition of Partheniades, critical shear stress for deposition according to the definition of Krone, the cohesion parameter governing the flocculation of cohesive sediment and a set of empirical parameters that define the density of the floc in terms of the size of the flocs. An examination of the variability of these parameters shows the need for testing site-specific sediments using a rotating circular flume to achieve a reliable prediction of the RIVFLOC model. Application of the model to various river systems has highlighted the need for including the entrapment process in a cohesive sediment transport model.
  • 923
  • 28 Jan 2022
Topic Review
Harmonics Affect Power Quality
Harmonic estimation is essential for mitigating or suppressing harmonic distortions in power systems. 
  • 923
  • 04 May 2023
Topic Review
Development of the Cogeneration Sector in Spain
Combined Heat and Power (CHP) has been identified by the EU as a powerful resource capable of making substantial contributions to energy savings and reducing GHG emissions. Spain’s effort to promote CHP has been prolific since the 1980s. In this regard, there have been various Laws, Royal Decrees (RDs) and European Union (EU) Directives addressed to reach the national objectives set for the CHP sector. Despite these attempts, the evolution and growth of installed CHP capacity has been irregular, compared to other technologies. Likewise, the academic treatment of the Spanish CHP evolution has not deserved the same attention as other technologies such as wind, photovoltaic and thermal solar systems. As a result, this article is aimed at providing a comprehensive overview of the regulatory frameworks applied to the Spanish CHP sector and analysing the reasons behind the variable evolution of the installed CHP capacity.
  • 923
  • 20 Feb 2024
Topic Review
Integrated HBIM Framework for Management of Heritage Buildings
Heritage buildings are subject to severe damage due to their exposure to dynamics such as environmental changes, earthquakes, structural loads and so on, thus needing a proper maintenance and management system. However, during the restoration, maintenance, and management process, heritage building practitioners face numerous challenges, such as inefficient project management, financial loss, and project delay. These problems arise due to a lack of digital documentation and updated information management systems. Heritage building management still uses traditional management techniques where heritage information is managed using multiple format systems by different professionals, thus missing collaboration, information integration, and interoperability. Building information modeling (BIM) is presented here as a supporting tool to address these issues.
  • 922
  • 18 Jul 2022
Topic Review
Electrode Materials for Supercapacitors in Hybrid Electric Vehicles
For hybrid electric vehicles, supercapacitors are an attractive technology which, when used in conjunction with the batteries as a hybrid system, could solve the shortcomings of the battery. Supercapacitors would allow hybrid electric vehicles to achieve high efficiency and better power control. Supercapacitors possess very good power density. Besides this, their charge-discharge cycling stability and comparatively reasonable cost make them an incredible energy-storing device. The manufacturing strategy and the major parts like electrodes, current collector, binder, separator, and electrolyte define the performance of a supercapacitor. Among these, electrode materials play an important role when it comes to the performance of supercapacitors. They resolve the charge storage in the device and thus decide the capacitance. 
  • 922
  • 20 Jan 2022
Topic Review
Mobile Phone Tracking
Mobile phone tracking is a process for identifying the location of a mobile phone, whether stationary or moving. Localization may be effected by a number of technologies, such as using multilateration of radio signals between (several) cell towers of the network and the phone, or simply using GPS. To locate a mobile phone using multilateration of radio signals, it must emit at least the idle signal to contact the next nearby antenna tower, but the process does not require an active call. The Global System for Mobile Communications (GSM) is based on the phone's signal strength to nearby antenna masts. Mobile positioning may include location-based services that disclose the actual coordinates of a mobile phone, which is a technology used by telecommunication companies to approximate the location of a mobile phone, and thereby also its user.
  • 920
  • 02 Dec 2022
Topic Review
Time Domain CMOS Temperature Sensor
Temperature sensors is based on the sensory device (CMOS, BJT or resistor) and the measured signal type (voltage, current, frequency, delay time, phase shift or bandwidth), they can be implemented in various ways. By defining the temperature estimation function X(T) as the ratio of two quantities chosen from tREF, t(T), fREF and f(T), a time domain temperature sensor can be implemented based on one among 12 types of operational principles.
  • 921
  • 30 Oct 2020
Topic Review
Seismic Design of Timber Buildings
Use of timber as a construction material has entered a period of renaissance since the development of high-performance engineered wood products, enabling larger and taller buildings to be built. In addition, due to substantial contribution of the building sector to global energy use, greenhouse gas emissions and waste production, sustainable solutions are needed, for which timber has shown a great potential as a sustainable, resilient and renewable building alternative, not only for single family homes but also for mid-rise and high-rise buildings. Both recent technological developments in timber engineering and exponentially increased use of engineered wood products and wood composites reflect in deficiency of current timber codes and standards. This paper presents an overview of some of the current challenges and emerging trends in the field of seismic design of timber buildings. Currently existing building codes and the development of new generation of European building codes are presented. Ongoing studies on a variety topics within seismic timber engineering are presented, including tall timber and hybrid buildings, composites with timber and seismic retrofitting with timber. Crucial challenges, key research needs and opportunities are addressed and critically discussed. Definition adverb(with reference to an increase) more and more rapidly. Example the coefficients show an exponentially decaying trend
  • 920
  • 27 Oct 2020
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