This paper deals with the preventive maintenance (PM) scheduling problem of reusable rocket engine (RRE), which is different from the ordinary repairable systems, by genetic algorithm. Three types of PM activities for RRE are considered and modeled by introducing the concept of effective age. The impacts of PM on all subsystems' aging processes are… (More)
High efficiency fabrication and integration of three-dimension (3D) functional devices in Lab-on-a-chip systems are crucial for microfluidic applications. Here, a spatial light modulator (SLM)-based multifoci parallel femtosecond laser scanning technology was proposed to integrate microstructures inside a given 'Y' shape microchannel. The key novelty of our… (More)
Rapid integration of high-quality functional devices in microchannels is in highly demand for miniature lab-on-a-chip applications. This paper demonstrates the embellishment of existing microfluidic devices with integrated micropatterns via femtosecond laser MRAF-based holographic patterning (MHP) microfabrication, which proves two-photon polymerization… (More)
Stress-related growth can occur after various traumas or stressful events. In order to investigate how anxiety and depression relate to stress-related growth, this study was conducted with 443 Chinese army recruits who had just finished a 3-month recruit training program. Path analyses revealed that resilience and positive/negative coping partially mediated… (More)
W e are living in a world characterized by change, complexity and paradox. Economic growth and the creation of wealth have cut global poverty rates, yet vulnerability, inequality, exclusion and violence have escalated within and across societies throughout the world. Unsustainable patterns of economic production and consumption promote global warming,… (More)
Atherosclerotic coronary artery disease (CAD) is the number one cause of death worldwide. The majority of CAD-induced deaths are due to the rupture of vulnerable plaques. Accurate assessment of plaques is crucial to optimize treatment and prevent death in patients with CAD. Current diagnostic techniques are often limited by either spatial resolution or… (More)
In the title mol-ecule, C(18)H(18)F(2)N(2)O(3)S, the dihedral angle between the benzene rings is 79.40 (11)°. The 2,4-difluoro-benzyl and azetidine fragments adopt a trans arrangement relative to the central benzene ring. In the crystal, weak C-H⋯O hydrogen bonds connect mol-ecules into a two-dimensional network parallel to (001).