This paper describes a frequency domain approach for evaluating the impact of tower shadow and wind shear effects (TSWS) on tie-line power oscillations. A simplified frequency domain model of an interconnected power system with a wind farm is developed. The transfer function, which relates the tie-line power variation to the mechanical power variation of a wind turbine, and the expression of th...

Tie-strength has been in the focus of social science research for decades, yet the use of measurement tools or scales has been relatively scarce. The aim of this study was to fill the gap and provide a tool that is able to provide a quantitative and continuous measure of tie strength in social networks. The focus was on virtual communities because the fast expansion of Internet use and the cons...

PURPOSE The angiopoietin (Ang) system plays an important role in vascular stabilization and pathologic neovascularization. The hypothesis for the study was that, in addition to modulating endothelial cell behavior, the angiopoietin/Tie-2 system also regulates the pericyte apoptosis and/or the vessel maturation associated with diabetic retinopathy. METHODS Tie-2 expression in cultured retinal ...

Arrays of subwavelength dipole bow-tie apertures are designed and characterized at terahertz frequencies. For an incident terahertz field perpendicular to the longer axis of the bow tie, a strong resonance enhancement, line narrowing, and a nonmonotonic frequency shift were observed with increasing length of the tapered bow-tie arms. Such characteristic behaviors primarily originate from locali...

Due to the scarcity of rational models for predicting the strength of RC beam-column sandwich joints, a modified simplified softened strut-and-tie model suggests a more rational calculation method for the effective compressive strength and the height of the joint concrete based on the simplified softened strut-and-tie. The shear strength of existing tested 15 sandwich interior joints is calcula...

The aetiology of recurrent miscarriage (at least three consecutive miscarriages) usually remains unsolved. The vascular endothelial growth factor (VEGF) family of proteins, together with their receptors and the Tie (tyrosine kinase with immunoglobulin and epidermal growth factor homology domains) receptors, are crucial for embryonic development. Therefore, we used immunohistochemistry to analys...

BACKGROUND Tongue-tie (more formally known as ankyloglossia) is a congenital anomaly characterized by an abnormally short lingual frenulum, which may restrict the mobility of the tongue tip impairing its ability to fulfil its functions. Ankyloglossia is uncommon, but not rare. Incidence figures reported in the literature vary widely, ranging from 0.02% to 4.8%. Incidences of upto 10.7% have bee...