Fish Tank or swimming granuloma caused by Mycobacterium marinum is an opportunist pathogen commonly found in aquatic environments. We present a 16 year-old boy with frequent exposure to aquarium water who had several nodules (sprotrichoid forms) on his right hand.Pervious studies showed that fish Tank granuloma is a rare skin infection (0.27 per 100,000 population in one year). However, taking proper history and considering the patient’s signs and symptoms could be helpful in diagnosis and treatment.

One of ways to prevent sloshing in fuel Tanks is to use baffles inside the Tanks. In this research, 5 Tank samples, including a non-baffle and baffle Tanks are modeled in 3D. In the following, by applying the gravitational acceleration to the Tank, the effects of the baffle’ s shape on sloshing and fluid motion inside the fuel Tank have been analysed by using the numerical method of volume of fluid (VOF), the results indicate an error value of less than 4% between numerical and experimental methods. Based on the results, the fluid sloshing reaches a relative stability after 0. 35 seconds, while in non-baffle Tank, this relative stability occurs after 1. 1 seconds. According to the results, the motion of the fuel is in the position of the baffle in bottom and middle is higher with respect to the lower height baffle than the position with the upper baffle in the Tank. Based on the results obtained in the simultaneous positioning of the baffles in the bottom, middle and upper, the fluid created less sloshing and the fuel pipe is in a better position than the baffles in other fuel Tanks.

The aim of this article is to present the methodology for modeling and simulation of start effects in spacecraft or satellite’ s propulsion system on the fuel sloshing in the Tank by pendulum model in microgravity conditions. In other words, the main aim of this paper is pure sloshing study of fuel and ullage gas relative movement, neglecting the role of Propellant Management Device (PMD). To this end, fuel sloshing in Tank is performed by utilizing the Fluent software based on pendulum model. Firstly, algorithm inputs are determined (exiting input, fuel and ullage gas volume, loading, dimensional specifications, etc. ); then, Tank is modeled and designed and, finally, fuel sloshing simulation in micro-gravity conditions is developed. Fuel sloshing modeling and simulation outputs include determining the sloshing damping rate and its value in the simulation at 20 sec, velocity variation contour, velocity direction contour in the Tank, and also ullage gas and fuel relative location in 0. 2, 0. 4, and 1 sec. The accuracy of the obtained results has been evaluated with the similar experimental results.

Knowledge of mixing time is of fundamental importance for investigation of mixing efficiency in agitation systems. The mixing time obtained by using the correlation and formula in large scale mixing systems was incorrect. Again, the number of available correlations in this scale of mixing systems is limited. To predict the mixing time of stirred Tanks with dual impellers commonly used in industry, a third-compartment mixing model was used. The time of homogenization of the charge (mixing time) was calculated from the time dependency of the local concentration of tracer measured at various locations. Experimental data on mixing time were obtained with a conductivity technique. In the present study distribution of tracer in the bulk of the liquid was described by compartment model (CM) as well as for stirred vessel with dual Rushton impellers. As for the model, a good agreement between the experimental data and the calculated values was apparent.

With increasing demand for rapidly sea transport, it is needed to overcome the constraints related to vessel low speeds. This demand appears mainly in the Millitary and passengers-carrying fields, which necessitates the need to high speed mono-hull or multi-hull vessels. With increase in the size and speed of the vessels, the need to develop an understanding of the structural dynamic loads and structural flexible responses is felt. The most important issues that the designers are interested in them are extraction of the bending moments and shear forces and also the forces induced by slamming effect. Among the different methods available for prediction of the affecting forces and structural responses full scale model test, numerical methods and scaled model test can be mentioned. Hydro elastic method, rigid backbone method and flexible backbone method are used in testing the scaled models. In the backbone method, a continuous beam is attached to the model. The methods to implement the measuring equipments on the rigid and flexible beams are different from each other. In this study, dimensional characteristics of the applied elastic hinges in the flexible beams in the scaled test models are extracted and the way to implement them in order to perform the tests is described.

This research describes the goals, design and implementation of a quasi natural gradient, laboratory scale, sand Tank (aquifer) model experiment. The model was used to study the transport of an inorganic tracer (Chloride) in groundwater, within a tropical aquifer (porous medium) material. Three-dimensional sand Tank (1.8 m × 0.3 m × 0.8 m) experiments were conducted to investigate contaminant transport and natural attenuation within the sand Tank. In all, 360 samples were collected during 24 sampling sessions, for the three days of the tracer experiments in the Sand Tank. The Owena sand is a poorly graded sand with 88.1 % sand and 11.9 % gravel. Geotechnical properties including; coefficient of uniformity Cu = 2.53, coefficient of gradation Cz = 0.181, hydraulic conductivity K = 5.76 x 10-4 m/s, bulk density ρ = 1.9 Mg/m3, effective porosity ne = 0.215 and median grain diameter D50 = 0.55 mm, were determined. Other relevant hydraulic and solute transport parameters, such as dispersion coefficients and dispersivities were also established for the tropical soil.