80 research outputs found
Modelling fluidized fluid-particle systems: from Euler-Euler and Euler-Lagrange approaches to hybrid models
No full textAuthor Behrad Esgandari, MScDissertation Johannes Kepler Universität Linz 202
Thermo-economic analysis of solar humidification-dehumidification desalination system with subsurface condenser
No full textAbstract: The solar humidification-dehumidification (HDH) desalination system with a subsurface condenser is a promising renewable energy-based desalination system to provide a sustainable water supply. In this study, the computational model of the solar HDH desalination system with the subsurface condenser is formulated based on thermodynamic analysis and the conservation of mass and energy. The developed model is used to evaluate the thermo-economic performance of the solar HDH desalination system with the subsurface condenser. For this purpose, the long-term performance of open-loop and closed-loop configurations of the system is evaluated. Moreover, to use the desalination system in remote areas facing a lack of electricity, photovoltaic cells are designed to supply the necessary electricity and are also included in the economic analysis. It is demonstrated that the average daily water yield and Gained Output Ratio (GOR) of the closed-loop system are 70% higher than the open-loop system. In addition, the cost of fresh water production in the closed-loop system is about 0.037 US /lit which is 41% less than the cost of water production in the open-loop system with photovoltaic cells. Therefore, according to the thermo-economic analysis, it is recommended that the solar HDH desalination system with the subsurface condenser be designed as a closed cycle.Résumé de la communication présentée lors du congrès international tenu conjointement par Canadian Society for Mechanical Engineering (CSME) et Computational Fluid Dynamics Society of Canada (CFD Canada), à l’Université de Sherbrooke (Québec), du 28 au 31 mai 2023
A comparison of bioleaching ability of mesophilic and moderately thermophilic culture on copper bioleaching from flotation concentrate and smelter dust
No full text
The Role of Ultraviolet Radiation in the Ocular System of Mammals
No full textWith decreasing levels of ozone in the atmosphere, we are being exposed to higher levels of ultraviolet radiation (UVR) than ever before. UVR carries higher energy than visible light, and its effects on tissues include DNA damage, gene mutations, immunosuppression, oxidative stress and inflammatory responses. In the eye, UVR is strongly associated with the development of basal and squamous cell carcinoma of the eyelid, pterygium, photokeratitis, climatic droplet keratopathy, ocular surface squamous neoplasia, cataracts, and uveal melanoma, and is weakly associated with age-related macular degeneration. Despite overwhelming evidence regarding the deleterious effects on UVR, public health measures to encourage UV protection of the eyes is generally lacking. Options for photoprotection include sunglasses, wide brim hats, windshields, plastic films for side windows in cars, UV blocking contact lenses, and following the UV Index report daily. The American National Standards Institute currently has regulations regarding properties of UV blocking sunglasses; however, compliance in the US is not mandatory. On the other hand, UVR does have therapeutic applications in the eye, particularly, riboflavin activated by ultraviolet A light (UVA) radiation is used clinically to slow the progression of keratoconus, post-LASIK keratectasia, and bullous keratopathy by crosslinking corneal collagen fibers. Additionally, riboflavin activated by UVA has been shown to have antibacterial, antiviral, and antiparasitic effects. This is clinically relevant in the treatment of infectious keratitis. Finally, exposure to low levels of light in the UV spectrum has been found to regulate the growth of the eye and lack of adequate exposure may increase the risk of development and progression of myopia
LiD-CAT: A Lightweight Detector for Cache ATtacks
No full textCache attacks are one of the most wide-spread and dangerous threats to embedded computing systems' security. A promising approach to detect such attacks at runtime is to monitor the System-on-Chip (SoC) behavior. However, designing a secure SoC capable of detecting such attacks is very challenging: the monitors should be lightweight in order to avoid excessive power/energy and area costs and the attack behavior should be clearly known upfront. In this work, we present LiD-CAT, a lightweight and flexible hardware detector that is aware of leakage patterns that can be used by attackers to perform cache based attacks. LiD-CAT is a cache wrapper that implements a set of leakage properties derived from cache attacks and cache models using templates. These templates identify suspicious behavior that may lead to cache attacks. LiD-CAT is evaluated using two different cache architectures, one with a secure cache and one without. On each of them, SPEC2000 benchmarks are run together with malicious applications that execute cache attacks (i.e., Evict+Time, Prime+Probe, Flush+Reload and Flush+Flush). Results show that our lightweight detector successfully detects 99.99% of the attacks with less than 1% false-positives, has no timing penalties, and increases the area of a SoC with only 1.6%.Accepted author manuscriptComputer EngineeringQuantum & Computer Engineerin
A New Scheme for Vision Based Flying Vehicle Detection Using Motion Flow Vectors Classification
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