AbstmctMembranes supported by posts are used as vibrating elements of capacitive micromachined ultrasonic transducers (CMUTs). The residual stress built up during the fabrication process determines the transducer properties such as resonance frequency, collapse voltage, and gap distance. Hence, it is important t o evaluate and control the stress in thin film CMUT membranes. The residual stress ...

For a surface traction t, acting on a region Γt of the boundary of a given body Ω supported on Γ0 ⊂ ∂Ω, we consider the infimum σ opt t = infσ {ess supx |σ(x)|} over all stress fields σ in equilibrium with t, i.e., the smallest essential bound on all conceivable stress fields. Using the space of LD-vector fields on Ω, we show that σ t is attainable by some stress field σ̂ and that σ opt t = sup ...

Nitrogen fertilizer application rates in intensive agricultural systems have increased dramatically in recent years, especially in protected vegetable production systems. This excessive use of nitrogen fertilizer has resulted in soil secondary salinity, which has become a significant environmental stress for crops such as cucumber, in the protected farmlands. It is thus necessary to illuminate ...

AIM To assess whether imminent amniocentesis is associated with the perception of increased stress and state anxiety in women and their partners and whether greater partner's involvement during pregnancy alleviates women's stress and anxiety. METHODS Two hundred twenty women awaiting amniocentesis and 90 male partners participated in the study. The State-Trait Anxiety Inventory, Perceived Str...

[1] The present study examines variations in the reference shear stress for bed load transport (tr) using coupled measurements of flow and bed load transport in 45 gravel-bed streams and rivers. The study streams encompass a wide range in bank-full discharge (1–2600 m/s), average channel gradient (0.0003–0.05), and median surface grain size (0.027–0.21 m). A bed load transport relation was form...

background: incidence of asthma in adolescents leads to variations in family status, roles and interaction with peers for them, which could be a source of stress and psychological tensions in them. therefore, the present study was conducted to investigate the effect of orem’s self-care model on perceived stress in adolescents with asthma. methods: in this semi-experimental study conducted from ...

OBJECTIVE To examine the impact of circulating testosterone (T) and the T/Estradiol (T/Ediol) ratio on chronic stress-induced changes of adrenal and hippocampal weight during proestrus (PE) and estrus (E) in female rats. DESIGN Stress was composed of repeated vaginal smear screening (VSS) and measured by the emotional reactivity score (ERS). Adrenal and hippocampal weight and the T, Ediol and...

Preeclampsia is associated with oxidative stress, which is suspected to play a role in hypertension, placental ischemia, and fetal demise associated with the disease. Various cellular sources of oxidative stress, such as neutrophils, monocytes, and CD4(+) T cells have been suggested as culprits in the pathophysiology of preeclampsia. The objective of this study was to examine a role of circulat...

Background: Stress is one of the major causes of physical and mental illnesses, which could interfere with individual's functions. Emotional intelligence skill is one of the controlling skills of stress and its negative consequences. Aim: To investigate the effect of teaching emotional intelligence skills on response to educational stress in high school girls. Methods: This experimental study w...