Nurses’ Lived Experience of Green Human Resource Management: A Qualitative Study

Introduction: Experts have considered environmental issues in health departments very important and essential. Understanding nurses’ experience of integrated human resource management and environmental management is an important aspect in this regard. Since nurses are a major source of organizational knowledge in hospitals, their point of views can be important and effective. Methods: This study was a qualitative content analysis with 21 nursing staff in hospitals affiliated to Kerman University of Medical Sciences. The participants were selected via purposive sampling method and data were collected through in-depth semi-structured interviews. The data collection continued until data saturation point. The Graneheim and Lundman method was applied to analyze the data. Results: In data analysis, six main and relevant themes were found, including "Green Culture Management", "Green Education", "Green Performance Management", "Green Empowerment", "Green Structure", and "Green Screening". Conclusion: Green human resource management activities are a set of cultural, organizational and individual factors, which strengthen the environmental attitude and performance in hospital

Turbulence modelling and role of compressibility on oil spilling from a damaged double hull tank

The viscosity plays an important role, and a multiphase solver is necessary to numerically simulate the oil spilling from a damaged double hull tank (DHT). However, it is uncertain whether turbulence modelling is necessary, which turbulence model is suitable; and what the role of compressibility of the fluids is. This paper presents experimental and numerical investigations to address these issues for various cases representing different scenarios of the oil spilling, including grounding and collision. In the numerical investigations, various approaches to model the turbulence, including the large eddy simulation (LES), direct numerical simulation and the Reynolds average Navier-Stokes equation (RANS) with different turbulence models, are employed. Based on the investigations, it is suggested that the effective Reynolds numbers corresponding to both oil outflow and water inflow shall be considered when classifying the significance of the turbulence and selecting the appropriate turbulence models. This is confirmed by new lab tests considering the axial offset between the internal and the external holes on two hulls of the DHT. The investigations conclude for numerically simulating oil spilling from a damaged DHT that when the effective Re is smaller the RANS approaches should not be used and LES modelling should be employed; while when the effective Reynolds numbers is large, the RANS models may be used as they can give similar results to LES in terms of the height of the mixture in the ballast tank and discharge but costing much less CPU time. The investigation on the role of the compressibility of the fluid reveals that the compressibility of the fluid may be considerable in a small temporal-spatial scale but plays an insignificant role on macroscopic process of the oil spilling

Three dimensional modeling of various slab and thin-strip twin-roll casting processes

This numerical modeling study consists of two main parts. The first part is related to the simulation of industrial scale continuous slab casting systems, while the second part deals with the simulation of a twin-roll thin-strip casting process. In the first part, a numerical investigation was conducted for exploring the steady state transport phenomena of coupled turbulent flow, heat transfer and macroscopic solidification in a continuous stainless steel slab caster. The solidification of molten steel was modeled through the implementation of the popular enthalpy-porosity and/or continuum modeling techniques. A series of simulations was carried out to investigate the effects of the casting speed, the delivered superheat, the immersion depth of the twin-ported submerged entry nozzle (SEN) and mold wall heat extraction rate on the velocity and temperature distributions and on the extent of the solidified and mushy regions on the narrow and broad faces of the caster.Next, the model was further developed to take into account two other important aspects of the continuous casting processes, namely electromagnetic flow control and bubble gas injection. For the electromagnetic part, the continuum model equations were solved simultaneously to study the usefulness of five different commercially used electromagnetic braking (EMBR) configurations in continuous slab casting processes. The predicted results showed that the minimum thickness of the solidifying shell at the mold exit increases due to the application of the EMBR devices.In a separate effort, the program was further advanced by incorporating the multiphase continuum model for simulating the argon gas bubble injection via the submerged entry nozzle (SEN) into the mold. The predicted results from this study showed that the flow pattern and temperature distribution were significantly influenced by the bubble injection especially in the upper part of the mold. The gas bubbles with smaller sizes were found to travel deeper towards the narrow face of the slab and spread wider in the mold.In the second part, a numerical study was carried out to investigate the two-dimensional turbulent flow, heat transfer and macroscopic solidification in a twin-roll thin-strip casting machine. The arbitrary nature of the computational domain was accounted for through the use of a non-orthogonal boundary-fitted coordinate (BFC) system on a staggered grid. The developed code was later used to study the sensitivity of the model parameters such as Darcy coefficient and turbulent viscosity modification factor in the mushy region as well as the effect of the casting parameters on the thin-strip twin-roll casting operations. (Abstract shortened by UMI.

Simulation of fluid flow and heat transfer in impingement flows of various configurations

Results of numerical simulation of two-dimensional flow field and heat transfer impingement due to laminar and turbulent single as well as multiple slot jets discharging normally into a confined channel are presented. Both low-Reynolds and high-Reynolds number versions of $k - epsilon$ models were used to model the turbulent jet flow. A control volume-based finite difference method was employed to solve the governing mass, momentum, turbulent kinetic energy, turbulent kinetic energy dissipation rate and energy equations in the turbulent impinging jet cases. A separate program was written based on a body-fitted coordinate system to predict the transport characteristics of multiple laminar jets impinging on a plate surface with an inclined upper confinement surface. The parameters studied include: the jet Reynolds number, nozzle-to-impingement surface spacing and for the inclined confinement surface cases, the angle of inclination of the upper surface. From the low-Reynolds number model studied it was found that models presented by Lam-Bremhorst and Launder-Sharma to be applicable to single turbulent jet impingement heat transfer predictions. Inclination of the confined surface so as to accelerate the exhaust flow was found to level the Nusselt number distribution on the impingement surface

Effect of Equal Channel Angular Pressing and Annealing Treatment on the Evolution of Microstructure in AlMg0.7Si Aluminum Alloy

In this research, samples of AlMg0.7Si aluminum alloy are deformed up to three passes using equal channel angular pressing (ECAP). Formation of a sub-micron structure after three passes of ECAP is demonstrated. Microstructural stability of the samples is investigated at temperatures of 300-500 °C. At 300 °C, fine recrystallized structure forms after 10 min which remains stable when the annealing proceeds up to 18 hrs. However, at 350 °C and higher, the microstructure is quite unstable. Even by 10 sec annealing, the samples exhibit recrystallized structure which turned to abnormal grain growth when temperature enhances to 500 °C and time up to 300 sec. &nbsp

Contribution to the knowledge of the genus Imparipes Berlese (Acari: Heterostigmata: Scutacaridae) associated with ants in Iran

Rahiminejad, Vahid, Nadimi, Ahmad, Seyedein, Sarina (2022): Contribution to the knowledge of the genus Imparipes Berlese (Acari: Heterostigmata: Scutacaridae) associated with ants in Iran. Zootaxa 5133 (4): 585-593, DOI: https://doi.org/10.11646/zootaxa.5133.4.

The effect of multi-pass friction stir processing on microstructure and mechanical properties of dual-phase brass alloy

This research aims to improve the microstructure and mechanical properties of C38000 brass alloy by multi-pass friction stir processing (MPFSP). In this study, The MPFSP was carried out on a dual-phase brass alloy sheet with a thickness of 5 mm at fully annealed conditions. To determine the effect of the number of passes on microstructure and mechanical properties of this alloy, rotational and traverse speeds were chosen at 750 rpm and 100 mm∖min, respectively. This process was performed in 1, 2, 4, and 6 passes. Metallography, microhardness, tensile, wear, and fractography are tests done to investigate the changes in microstructure and mechanical properties after processing. Finally, the relation between the microstructural and mechanical properties of MPFSPed specimens was discussed. Studying the tests mentioned above resulted that the MPFSP has caused a decrease in the grain size of the matrix and second phase (β′) particles. Furthermore, mechanical properties such as yield strength, ultimate tensile strength, and hardness were enhanced. It was obtained that elongation to failure has a decreasing trend with increasing the number of FSP passes. Tribological behaviors were also improved after performing MPFSP. The levels of grain size refining and improving the mechanical properties are directly related to increasing the number of passes. However, after performing six passes of FSP, there was no significant change in the microstructure and mechanical properties in comparison to that after 4 passes of FSP. The properties of 4 and 6 passes FSPed specimens showed that these had the most refined microstructures and enhanced mechanical properties with remarkable elongation