Molecular, spectroscopic, and magnetic properties of cobalt(II) complexes with heteroaromatic N(O)-donor ligands

New [Co(SCN)2(L)4/2] complexes, where L = b-pic (1), pyCH2OH (2), py(CH2)3OH (3), 1,2,4- triazolo[1,5-a]pyrimidine (4), [CoCl2(urotrop)2] (5), and [Co(DMIM)3]Cl2 H2O (6) where urotrop = hexamethylenetetramine and DMIM = 2,20-bis(4,5-dimethylimidazolyl) were synthesized in simple reactions of CoCl2 6H2O with ammonia thiocyanate and pyridine type ligands or urotropine and diimidazolyl ligands with cobalt(II) chloride in methanol solutions. The orthorhombic crystallization for (1), (2), and (4), the monoclinic one for (3) and (5) as well as the hexagonal one for (6) were found. The plots of the overlap population density-of-states indicated nonbonding character of the interactions between pyridine derivatives ligands and cobalt(II) ions in the complexes (1)–(4). The electronic spectra showed almost perfect octahedral complex in the case of (6). The magnetic susceptibility measurements revealed paramagnetic behavior with low values of the Curie–Weiss temperature, positive for complex (5) and negative for the other ones, although the transition to collective magnetic state at low temperatures for (4) and (5) was evidenced by an observation of antiferromagnetic coupling with Ne´el temperature of 4.5 K and the ferromagnetic one with Curie temperature of 10 K, respectively

Placenta previa percreta with bladder involvement managed conservatively – case report

Placenta percreta is potentially a life-threatening condition. Pelvic organ invasion of the placenta carries high mortality and morbidity to the mother and fetus. We present a 33 year old gravida 3, para 2-0-0 female with placenta previa, percreta with bladder invasion. Placental invasion caused a giant vesicouterine fistula. The pregnant woman was managed conservatively until 33 weeks gestation, at which time she underwent a classical cesarean section. Postoperatively the patient was treated with methotrexate. Immediately postpartum the placenta was left in situ and successfully removed transvaginally after 11 weeks postpartum

Risk Management Using Network Thinking Methodology on the Example of Rail Transport

The purpose of the article is to define the risk factors in rail transport and to show that the lack of sufficient identification of risks in individual phases affects the implementation of this type of transport. A literature study has been conducted to identify key risk factors and their impact on rail transport in Poland. For this purpose, a list of railway accidents in 2010–2020 in which people were injured, or there were significant losses in terms of the environment was presented. The realization of the objective focused on research proceedings covering the theoretical and cognitive sphere. This study included an analysis of the existing theoretical heritage in the area of risk management processes in rail transport, as well as a survey of the empirical research, which concentrated on the identification and assessment of key factors that influence the realization of rail transport in Poland. The work is of a utilitarian nature, as the need for conscious risk management has been demonstrated in rail transport, and guidelines for risk management in rail transport have been developed. In addition, the paper presents the possibilities offered by modeling a problem situation with the help of network thinking methodology for solving complex problems, including supporting creativity on the example of railroad transport in Poland. To define problem situations in the studied area, a complex process of a multifaceted approach to the analyzed issue is required. When assessing the effectiveness of risk management in rail transport, one should take into account the adverse factors influencing the studied phenomenon. The main sources used to write this article were the available literature in the field of emergency management and publications on railroad transport. The conclusions have been based on the results of logical analysis, verified empirically with the use of statistical methods

Risk Management Using Network Thinking Methodology on the Example of Rail Transport

The purpose of the article is to define the risk factors in rail transport and to show that the lack of sufficient identification of risks in individual phases affects the implementation of this type of transport. A literature study has been conducted to identify key risk factors and their impact on rail transport in Poland. For this purpose, a list of railway accidents in 2010–2020 in which people were injured, or there were significant losses in terms of the environment was presented. The realization of the objective focused on research proceedings covering the theoretical and cognitive sphere. This study included an analysis of the existing theoretical heritage in the area of risk management processes in rail transport, as well as a survey of the empirical research, which concentrated on the identification and assessment of key factors that influence the realization of rail transport in Poland. The work is of a utilitarian nature, as the need for conscious risk management has been demonstrated in rail transport, and guidelines for risk management in rail transport have been developed. In addition, the paper presents the possibilities offered by modeling a problem situation with the help of network thinking methodology for solving complex problems, including supporting creativity on the example of railroad transport in Poland. To define problem situations in the studied area, a complex process of a multifaceted approach to the analyzed issue is required. When assessing the effectiveness of risk management in rail transport, one should take into account the adverse factors influencing the studied phenomenon. The main sources used to write this article were the available literature in the field of emergency management and publications on railroad transport. The conclusions have been based on the results of logical analysis, verified empirically with the use of statistical methods