Effects Of Pressure Conditions Research Articles

Effect of Pressure Conditions in Uterine Decellularization Using Hydrostatic Pressure on Structural Protein Preservation.

Uterine regeneration using decellularization scaffolds provides a novel treatment for uterine factor infertility. Decellularized scaffolds require maximal removal of cellular components and minimal damage to the extracellular matrix (ECM). Among many decellularization methods, the hydrostatic pressure (HP) method stands out due to its low cytotoxicity and superior ECM preservation compared to the traditional detergent methods. Conventionally, 980 MPa was utilized in HP decellularization, including the first successful implementation of uterine decellularization previously reported by our team. However, structural protein denaturation caused by exceeding pressure led to a limited regeneration outcome in our previous research. This factor urged the study on the effects of pressure conditions in HP methods on decellularized scaffolds. The authors, therefore, fabricated a decellularized uterine scaffold at varying pressure conditions and evaluated the scaffold qualities from the perspective of cell removal and ECM preservation. The results show that by using lower decellularization pressure conditions of 250 MPa, uterine tissue can be decellularized with more preserved structural protein and mechanical properties, which is considered to be promising for decellularized uterine scaffold fabrication applications.

Performance and decision making of a complex skill under monitoring and outcome pressure conditions: Which of them can reinvestment predict?

Despite a huge amount of research conducted on performance under competitive pressure, the different components of a competitive environment such as outcome pressure or monitoring pressure, have less been investigated. The present study aimed to investigate the performance and decision making of a complex skill and their link with reinvestment (a type of self-focus behavior) under different conditions of pressure using a table tennis task. The topspin forehand and backhand shots of 20 expert table tennis athletes were examined under low, monitoring, and outcome pressure conditions in a within-group design. In addition, predictive validities of Decision-Specific Reinvestment Scale (DSRS) and Movement-Specific Reinvestment Scale (MSRS) with the changes of performance and decision making from low- to high-pressure conditions as dependent variables were examined. The repeated measures ANOVA results showed that the effects of pressure conditions on anxiety were significant. Decision accuracy under outcome pressure and decision speed under monitoring and outcome pressure conditions were decreased. The performance of athletes was decreased under monitoring pressure while no changes was observed in their performance under outcome pressure. Decision Reinvestment (a factor of DSRS) could predict decision speed changes under both pressure conditions, while Movement Self-Consciousness (a factor of MSRS) could predict performance changes only under monitoring pressure. Our Findings highlight that the subscales of MSRS and DSRS were activated independently and a competitive pressure situation has different effects on the cognitive and motor aspects of complex skills. It is suggested that expert athletes and coaches consider separate pressure conditions and their relationships with the ongoing task.

Influence of Sintering Conditions on Mechanical Properties of Ag-Nano Sintered Material

Recently, sintering joint using Ag-nanohas been attracting attention as a new joint method to replace the solder. However, the joint layer would contain a lot of voids after sintering processes. Since the voids affect mechanical property, the proper sintering conditions have to be selected in order to reduce these voids. In this research, the authors focus on the effect of pressure conditions at sintering process. Then, by creating FEM models including voids from cross section image of the joint layer and carrying out tensile analysis, the mechanical property of the joint layer has been acquired. Using this approach, the influence of pressure conditions on the mechanical properties is revealed.

ベンチュリ管スロート部におけるキャビテーションの衝撃エネルギーに及ぼす噴射条件の影響の評価

ベンチュリ管スロート部におけるキャビテーションの衝撃エネルギーに及ぼす噴射条件の影響の評価

Effects of atmospheric pressure conditions on flow rate of an elastomeric infusion pump

The effects of pressure conditions, both hyperbaric and hypobaric, on the flow rate of an elastomeric infusion pump were investigated. The altered pressure conditions were tested with the restrictor outlet at two different conditions: (1) at the same pressure condition as the Infusor elastomeric balloon and (2) with the outlet exposed to ambient conditions. Five different pressure conditions were tested. These included ambient pressure (98-101 kilopascals [kPa]) and test pressures controlled to be 10 or 20 kPa below or 75 or 150 kPa above the ambient pressure. A theoretical calculation based on the principles of fluid mechanics was also used to predict the pump's flow rate at various ambient conditions. The conditions in which the Infusor elastomeric pump and restrictor outlet were at the same pressure gave rise to average flow rates within the ±10% tolerance of the calculated target flow rate of 11 mL/hr. The flow rate of the Infusor pump decreased when the pressure conditions changed from hypobaric to ambient. The flow rate increased when the pressure conditions changed from hyperbaric to ambient. The flow rate of the Infusor elastomeric pump was not affected when the balloon reservoir and restrictor outlet were at the same pressure. The flow rate varied from 58.54% to 377.04% of the labeled flow rate when the pressure applied to the reservoir varied from 20 kPa below to 150 kPa above the pressure applied to the restrictor outlet, respectively. The maximum difference between observed flow rates and those calculated by applying fluid mechanics was 4.9%.