Many studies have been carried out on the influence of freeze–thaw cycles mechanical behavior cement- or lime-stabilized soils. However, very limited considered effects cement-stabilized soil reinforced with fibers. The main objective this study is to determine polypropylene fiber (PPF) and basalt (BF) content (0%, 0.5%, 1%, 2%, 5%), cement 3%, 9%), number (0, 2, 4, 8, 10), initial moisture unconfined compressive strength (UCS) clay soil. reveals that adding cement, PPF, BF causes a...

This paper describes the effect of stabilizer content, curing time and moisture content on UCS based upon 150 samples stabilized soil. The results indicate an optimum value lime or cement which corresponds to maximum UCS. is dependent while independent it. increase values due in cement-stabilized noticeably higher than lime-stabilized ones. have also a direct inverse relationship respectively with content. prediction possible by incorporation fuzzy logic Adaptive Neuro Fuzzy Inference System...

So far, a limited number of studies have been published on utilisation crushed stone waste, cement, lime and pozzolan as stabilisers for soil stabilisation. The research conducts engineering properties strength test various contents under curing times. Increasing the or cement content resulted in an increase UCS; however, UCS increased from 0% to 5% then decreased violated 5%. An granite 10% value. unsoaked CBR values are almost 1.37 1.24 times more than corresponding soaked ones all cases,...

The mechatronic design of a novel mechanism for ball and plate system is discussed. A webcam provides the with feedback ball's position. heuristic technique image processing introduced. kinematics dynamics are also described. Supervisory fuzzy control sliding techniques proposed to perform position system. Experimental results corroborate validity controllers.

A compressed air energy storage system that uses a high pressure, isothermal compressor/expander (C/E) has no carbon emission and is more efficient than conventional fossil fuels. To be successful, the must power density. However, there trade-off between efficiency density due to heat transfer. The authors' previous work shown by optimising compression/expansion trajectories in liquid piston C/E, can improved many times without sacrificing efficiency. Yet, achieve optimised trajectory, this...

The key component of Compressed Air Energy Storage (CAES) system is an air compressor/expander. roundtrip efficiency this energy storage technology depends greatly on the There a trade off between thermal and power density component. Different ideas approaches were introduced studied in previous works to improve by enhancing heat transfer its environment. In present work, combination optimal compression/expansion rate, chamber shape exchanger material distribution considered maximize for...

Heat transfer during compression of air in a long, thin tube is studied by CFD. The represents one the many honeycomb geometry inserted liquid piston compressor to minimize temperature rise. A dimensionless number for heat flow rate that includes changing area between wall and used. From CFD results, alinear relation inverse this Stanton found. Using thisrelation, transient volume-averaged temperature, from can be well predicted thermodynamic modeling.With model, non-linear ODE solved...

A high-level supervisory controller is developed for a Compressed Air Energy Storage (CAES) system integrated with wind turbine. Complementary to the low-level controllers in our previous works track generator power and pressure, this coordinates different subsystems optimize performance. The control strategy obtained by solving an optimal storage/regeneration problem order maximize achievable total revenue from selling electricity electric grid. Dynamic Programming (DP) approach used solve...

The motion of biological micro-robots - similar to that swimming microorganisms such as bacteria or spermatozoa is governed by different physical rules than what we experience in our daily life. This particularly due the low-Reynolds-number condition swimmers micron scales. Quadroar swimmer, with three-dimensional maneuverability, has been introduced for moving these extreme cases: either a bio-medical micro-robot fluids mm-scale robot performing inspection missions highly viscous fluid...

An efficient and sufficiently power dense air compressor/expander is the key element in a Compressed Air Energy Storage (CAES) approach. Efficiency can be increased by improving heat transfer between its surrounding materials. One effective practical method to achieve this goal use water droplets spray inside chamber when compressing or expanding. In paper, compression cycle modeled considering one-dimensional droplet properties lumped model. While it possible inject into at any time,...

The power density and efficiency of high compression ratio (~200:1) air compressors/expanders are crucial for the economical viability a Compressed Air Energy Storage (CAES) system such as one proposed in [1]. There is trade-off between that strongly dependent on heat transfer capability within compressor/expander. In previous papers, we have shown or expansion trajectory can be optimized so given power, vice versa. Theoretically, ratios, improvement over ad-hoc trajectories significant-...

In an isothermal compressed air energy storage (CAES) system, it is critical that the high pressure compressor/expander both efficient and power dense. The fundamental trade-off between efficiency density due to limitation in heat transfer capacity during compression/expansion process. our previous works, optimization of trajectory has been proposed as a means mitigate this trade-off. Analysis simulations have shown use optimized can increase significantly (2–3 fold) over ad-hoc linear or...

Air compressor is the critical part of a Compressed Energy Storage (CAES) system. Efficient and fast compression air from ambient to pressure ratio 200–300 challenging problem due trade-off between efficiency power density. Compression mainly affected by amount heat transfer its surrounding during compression. One way increase implement an optimal trajectory, i.e., unique trajectory maximizing for given time ratio. The main model convective coefficient (h) which in general function local...

Maintaining the accumulator pressure regardless of its energy level and tracking power demanded by electrical grid are two potential advantages Compressed Air Energy Storage (CAES) system proposed in [1, 2]. In order to achieve these goals, a nonlinear controller is designed motivated an energy-based Lyapunov function. The control inputs storage include displacement pump/motor hydraulic transformer liquid piston air compressor/expander. While latter has relatively low bandwidth, former...

Abstract We present a new method for underwater wireless communication with high bandwidth and over long distance. A swarm of Autonomous Underwater Vehicles (AUVs) is used to relay an optical signal between two points at any Each vehicle equipped multiple attitude stabilization systems reach the required pointing tracking accuracy communication. This technology would enable fast efficient exploration which highly needed as only 5% world’s oceans have been explored so far. carried out...

Abstract Rainfall is perhaps the most important source of drinking and agriculture water for inhabitants different parts world, particularly in arid semi-arid area like Iran. Hence, simulation this hydrological phenomenon crucial. The current research attempts to reproduce long-term monthly precipitation Ardabil, Iran, during 44 years from 1976 2020 first time via a hybrid fuzzy technique. For developing model (WANFIS-FA), adaptive neuro-fuzzy inference system (ANFIS), firefly algorithm...

Abstract This study explores seasonal fluctuations in water quality and phytoplankton communities within Karun-4 Dam Lake, the largest double-arch dam Middle East situated Iran. Employing a systematic approach, 26 sampling stations were strategically selected to collect surface samples at depth of 50 cm during midpoints each season throughout 2019. Significant variations parameters composition observed. Predominant species included Chrysophyceae (38%) Bacillariophyceae (32%), indicative...