Influence of heat treatment on microstructure and mechanical properties of Ti-6Al-4V forgings

W pracy analizowano wpływ obróbki cieplnej na mikrostrukturę, mikrotwardość oraz wytrzymałość na rozciąganie odkuwek matrycowych ze stopu Ti-6AI-4V. Na podstawie uzyskanych wyników badań stwierdzono, że sposób chłodzenia materiału po obróbce cieplnej w temperaturze 950°C wpływa na udział objętościowy poszczególnych faz, natomiast nie wpływa na mikrotwardość materiału wygrzewanego w temperaturach 900 i 950°C. Ponadto dwuetapowa obróbka cieplna nie zmienia wytrzymałości na rozciąganie, powoduje natomiast nieznaczny wzrost granicy plastyczności.The paper analyzes the influence of selected heat treatment on microstructure, microhardness and tensile strength of Ti-6AI-4V die forging. In view of the results it has been reported that cooling after heat treatment at temperature of 950°C influences volume fraction ratio of particular phase, nevertheless does not change microhardness of heat-treated samples at temperature of 900 and 950°C. Beside two-stage heat-treatment does not influence tensile strength, however it causes a slight increase in yield strength

Simulation of the flowing diesel fuel during filling and emptying transport tanks

W artykule dokonano symulacji przepływu oleju napędowego w układzie napełniania i opróżniania zbiorników transportowych. Na podstawie przedstawionych w opracowaniu wyników badań, określono wpływ konstrukcji urządzenia oraz parametrów zasilania na kształtowanie się zmian prędkości przepływu, gęstości, temperatury oraz lepkości dynamicznej. Graficzną ilustrację symulacji wraz z wykresami pokazano na wykresach.This paper presents the flow simulation of oil in the system of filling and emptying transport tanks. Based on the results of the study, defined the influence of the equipment construction and parameters (pressure supply work productivity) on the changes in flow velocity, density, temperature and dynamic viscosity. A illustration of the simulation results are shown in the graphs

Using the techniques of CAD/CAE in designing and analyzing of scissor car jacks

W artykule przedstawiono możliwości wykorzystania technik komputerowych CAD/CAE do modelowania i analizy ruchu nożycowego podnośnika samochodowego. Opracowany model symulacyjny, zawierający szkieletowy model podnośnika, pozwala na symulowanie pracy mechanizmu nożycowego podczas wykonywania przez niego złożonego cyklu pracy. Wyniki analiz wykorzystano do opracowania wirtualnego modelu konstrukcji podnośnika.This article presents the possibilities of using computer technology of CAD/CAE for modeling and analysis motion of the scissor car jacks Developed a simulation model that contains skeletal model of jack, allows you to present simulation of the scissor mechanism during the performance of composite work cycle. The results of this analysis were used to develop of the virtual model of the jacks structure

Project alone jamming oneself sling along cars cranes

W artykule omówiony został projekt samozakleszczającego się zawiesia wykorzystywanego do przeładunku towarów o gabarytach od 275 mm do jednego metra oraz o masie maksymalnej wynoszącej 6800 kg. Zawiesie to umożliwia jednoosobową obsługę przy wyładowywaniu ładunków ze skrzyni ładunkowej samochodu.The article is describing the project alone jamming oneself sling along with analysis of stresses of Messes. they carried out a project with 3D model with the SolidWorks 2010 program

Ciclosporin metabolite pattern in blood and urine of liver graft recipients. I. Association of ciclosporin metabolites with nephrotoxicity

Blood ciclosporin (Cs) metabolite pattern in 58 liver grafted patients was routinely monitored by HPLC from the first Cs dose after transplantation until discharge from hospital. Eighteen patients with normal kidney function were allocated to Group I and 14 patients in Group II suffered Cs nephrotoxicity during their clinical course. There were no significant differences between both groups in blood Cs level, kidney function before transplantation, liver function or co-administration of other potentially nephrotoxic drugs. A correlation matrix involving both groups showed a significant correlation between the blood concentration of metabolite M1c9 and serum creatinine and urea, and an inverse correlation with creatinine clearance. During a nephrotoxic episode the blood concentrations of metabolites M1c9 and M1A were significantly elevated in patients in Group II. Analysis of the time course revealed significantly higher blood levels of M19 and M1c9 in Group II patients compared with those in Group I for the first 10 days after transplantation. Serum creatinine and urea concentrations remained significantly elevated, the creatinine clearance being significantly reduced throughout the period of observation. The elevated blood concentrations of ciclosporin metabolites M1c9 and M19 during nephrotoxic episodes suggest that these metabolites are associated with ciclosporin nephrotoxicity. It could not be decided if the elevated metabolite concentrations were the result of and/or the reason for impaired kidney function

Ciclosporin metabolite pattern in blood and urine of liver graft recipients. II. Influence of cholestasis and rejection

The pattern of metabolites of ciclosporin in blood and 24 h-urine of 58 liver graft recipients was routinely monitored by HPLC from transplantation until discharge from hospital. Liver function and ciclosporin metabolite pattern in patients with an uncomplicated clinical course and in those with cholestasis or acute rejection were compared. During cholestasis M19 and M1A, and during acute rejection M19, in blood were significantly elevated compared to the control group. Blood M19 was significantly correlated with bilirubin concentration and gamma-glutamyl transferase activity in serum, and M1A with the serum bilirubin concentration. Analysis of the metabolite pattern over the observation period showed higher concentrations of M19 and M1A in blood from patients with cholestasis and acute rejection than in the control group; concentrations were lower in the rejection group than in the cholestasis group. The metabolite pattern in 24 h-urine showed similar alterations in ciclosporin metabolite pattern to those in blood. Cholestasis and rejection shift the ciclosporin metabolite pattern in blood and urine to higher concentrations of M19 and M1A, whereas the concentrations of other metabolites and ciclosporin were not significantly affected