The primary objective is to perform a numerical synthesis of a Williamson fluid that has nanoparticles added to it and is directed toward a vertical cone in a uniform transverse magnetic field, under heat and mass transport, suction and injection, and convective boundary conditions. For this particular fluid flow, by utilising similarity transformations, the partial differential equations are transformed into ordinary differential equations. Calculating these kinds of equations with their suitable bounds requires the Runge–Kutta technique in combining a shooting strategy. The functions of a vast number of parameters are graphically represented and assessed on flow field profiles. The results show the local skin friction, local Nusselt number, and local Sherwood number and the changing values of the flow constraints. Finally, the results are compared to those from the previously published works and found to be in good agreement.

The pump performance and occurrence of cavitation directly depends on different operating conditions. To cover a wide range of operation conditions for detecting cavitation in this work, investigations on the effect of various suction valve openings on cavitation in the pump were carried out. In order to analyse various levels of cavitation in different operation conditions, the effect of the decrease in the inlet suction pressure of the centrifugal pump by controlling the inlet suction valve opening was investigated using this experimental setup. Hence, the acoustic and pressure signals under different inlet valve openings and different flow rates, namely, 103, 200, 302 l/min were collected for this purpose. A detailed analysis of the results obtained from the acoustic signal was carried out to predict cavitation in the pump under different operating conditions. Also, the acoustic signal was investigated in time domain through the use of the same statistical features. The FFT technique was used to analyse the acoustic signal in the frequency domain. In addition, in this work an attempt was made to find a relationship between the cavitation and noise characteristics using the acoustic technique for identifying cavitation within a pump.

Aim: Assessment of the effectiveness and efficiency of three mobile (portable) rescue aspirators models in the opinion of state fire service officers. Comparison with the use of the medical simulation element.
Material and Methods: The study was conducted in organizational units of the State Fire Service (24-hour officers). The research consisted in carrying out the task with the use of three models of mobile rescue aspirators (manual, hand-foot, battery). Each participating firefighter had the task of sucking up an equal amount of fluid (100 ml, respectively) with each model of an aspirator. The test fluid was water at room temperature in a homogeneous 1:1 mixture with sugar (increased viscosity and density, simulated real conditions). Immediately after three suction attempts (with measured suction time), each officer completed a questionnaire on the three models used. Descriptive statistics were used to characterize the variables. The following measures were calculated for the variables: mean (M) and standard deviation (SD), minimum, maximum. The following measures were calculated for categorical variables: number (n) and frequency (%).
Results: 184 officers (182 M and 2 F) took part in the study, including commanders 18.43%, rescuers 65.22%, drivers 16.30%. In the study area 1,609 officers serve in the combat division as at the end of 2021. The studied group accounts for 11.43%. Age of respondents M 34.04 SD 8.24 Min 21 Max 52, length of service M 8.48, SD 7.20 Min 1, Max 25. The longest mean time of completing the task was recorded for model 2 (hand-foot) and it was 6.77 sec.
Conclusions: SFS officers highly appreciated the usefulness and effectiveness of the battery-operated automatic aspirator. This assessment may contribute to the widespread introduction of such a model to rescue sets in the SFS. Time of performing the task by mode 1 was significantly longer by elderly people. People with experience with the model 1 during rescue and firefighting operations had a significantly shorter time of performing the task with the use of the model 2. According to the subjective assessment of firefighters, the most effective is model 3, which is confirmed by the suction time obtained at the work station.

Heat and mass transfer stretched flow of an incompressible, electrically conducting Jeffrey fluid has been studied numerically. Nanoparticles are suspended in the base fluid and it has many applications such as cooling of engines, thermal absorption systems, lubricants fuel cell, nanodrug delivery system and so on. Temperature dependent variable thermal conductivity with Rosseland approximation is taken into account and suction effect is employed in the boundary conditions. The governing partial differential equations are first transformed into set of ordinary differential equations using selected similarity transformations, which are then solved numerically using Runge-Kutta-Felhberg fourth-fifth order method along with shooting technique. The flow, heat and mass transfer characteristics with local Nusselt number for various physical parameters are presented graphically and a detailed discussion regarding the effect of flow parameters on velocity and temperature profiles are provided. It is found that, increase of variable thermal conductivity, radiation, Brownian motion and thermophoresis parameter increases the rate of heat transfer. Local Nusselt number has been computed for various parameters and it is observed that, in the presence of variable thermal conductivity and Rosseland approximation, heat transfer characteristics are higher as compared to the constant thermal conductivity and linear thermal radiation.

The data was collected from yellow water trays and Johnson suction trap placed in the urban area of Poznań. The aphids were caught from May to October, every decade in yellow trays and from May to December daily by suction trap (high ofl2.2 m) from 1999 to 2001. A total of 120 tree-dwelling aphid species from 8 families were found: 2 from Adelgidae. l from Phylloxeridae, 15 from Pemphigidae, 3 from Anoeciidae, 19 from Phyllaphididae, 10 from Chaitophoridae, 8 from Lachnidae and 59 from Aphididae. Rhopalosiphum padi (L.), Anoecia corni (F.), Hyalopterus pruni (Geoff.) were the most frequent aphid species caught in the suction trap and Rhopalosiphum pad i (L.), Drepanosiphum platanoidis (Schrk.), Myzus persicae (Sulz.), Phyllaphis fagi (L.) and Anoecia c orni (F.) in yellow trays.