We report and discuss a case of primary hydatidosis of the pelvic cavity in a woman who presented with severe weight loss and abdominal pain. This unusual presentation was initially considered as a tumor process until surgical exploration and microscopic studies confirmed the diagnosis. The gynecologists should be aware of possibility of primary hydatid cyst of the pelvic cavity and should be considered in the differential diagnosis of cystic pelvic masses, especially in areas where the disease is endemic.

Primary hydatid cyst of the parotid gland is extremely rare, even in the endemic areas. A 23-year-old woman presented with slowly progressive swelling in the right periauricular region. Computed tomography (CT) scan of the head and neck revealed a round, well-demarcated water-density mass in the right parotid gland. At the operation, the cystic mass replacing most of the superficial part of right parotid gland was demonstrated. Superficial parotidectomy was carried out. Histopathological examination confirmed the diagnosis of hydatid disease. CT scan is a valuable imaging method for diagnosis of parotid cystic lesions; however, other acquired and congenital cystic lesions of parotid gland may have similar appearance and should be differentiated. Where the incidence of the disease is high, hydatid cyst of parotid gland should be considered in the differential diagnosis of lesions causing swelling of the parotid area.

Purpose The purpose of this paper is to study the steady laminar magnetohydrodynamics (MHD) flow of a magnesium oxide-silver/water hybrid nanofluid along a horizontal slim needle with thermal radiation by considering dual solutions. Design/methodology/approach It is assumed that the needle can move in the same or opposite direction of the free stream. Also the solid phase and fluid phase are in thermal equilibrium. The basic partial differential equations become dimensionless using a similarity transformation method. Moreover, problem coding is accomplished using the finite difference method. The emerging parameters are nanoparticles mass (0–40 gr), base fluid mass (100 gr), needle’s size (0.001–0.2), magnetic field parameter, velocity ratio parameter, radiation parameter and Prandtl number (6.2). Findings With help of the stability analysis, it is shown that always the first solutions are physically stable. Results indicate that the magnetic parameter and the second nanoparticle’s mass limit the range of the velocity ratio parameter for which the solution exists. Besides, the magnetic parameter leads to decrease of quantities of engineering interest, i.e. skin friction coefficient and local Nusselt number. Originality/value To the best of the authors’ knowledge, no one has ever attempted to study the present problem through a mass-based model for hybrid nanofluid. Moreover, the dual solutions for the problem are new. Indeed, the results of this paper are purely original and the numerical achievements were never published up to now. Finally, the authors expect that the present investigation would be useful in hot-wire anemometer or shielded thermocouple for measuring the velocity of the wind, etc.

There are various solutions for noise control. One of the important issues is the choice of the most appropriate solution based on criteria. The aim of this study was to prioritize the noise control solutions using a fuzzy AHPâ–“TOPSIS method in the distillation unit of a refinery. At first, the sound pressure level was measured at the distillation unit and the main noise sources were identified. Then, ten control solutions and five prioritization criteria including efficiency, cost, safety, executive capability and non-interference in the process were selected according to the opinions of experts. In the next step, twenty experts were asked to compare criteria and solutions. Finally, criteria were weighted using the Fuzzy analytical hierarchy process and solutions were prioritized using technique for order preference by similarity to ideal solution method. Criteria based on the importance in the noise control included efficiency (normal weight of 0.265), cost (normal weight of 0.234), safety (normal weight of 0.226), executive capability (normal weight of 0.202), and non-interference in the process (normal weight of 0.070). The personal enclosure (coefficient closeness index of 0.1475) and modification or change of process (coefficient closeness index of 0.0595) had the highest and lowest priorities at the noise control, respectively. Regarding criteria and operational conditions in the refinery, the use of a personal enclosure was selected as the first solution at the noise control. Fuzzy AHPâ–“TOPSIS method can also be used to prioritize control solutions in other industries.

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