Chronic tracheoesophageal fistulas [TEFs] represent one of the greatest challenges for endoscopists [1]. A 63-year-old man diagnosed with adenocarcinoma of the esophagogastric junction was treated with neoadjuvant chemoradiotherapy and esophagectomy. He developed two TEFs, which required the implantation of two self-expandable stents and a feeding jejunostomy. The prostheses were withdrawn 3mon...

BACKGROUND Toxic equivalency factors (TEFs) are an important component in the risk assessment of dioxin-like human exposures. At present, this concept is based mainly on in vivo animal experiments using oral dosage. Consequently, the current human TEFs derived from mammalian experiments are applicable only for exposure situations in which oral ingestion occurs. Nevertheless, these "intake" TEFs...

Modern wind turbines have been steadily increasing in size, and have now become very large, with recent models boasting rotor diameters greater than 120 m. Reducing the loads experienced by the wind turbine rotor blades is one means of lowering the cost of energy of wind turbines. Wind turbines are subjected to significant and rapid fluctuating loads, which arise from a variety of sources inclu...

Teacher education for sustainability (TEfS) aims to prepare future educators their role as societal change agents by developing in them specific competencies. Whereas previous literature has dealt extensively with concepts and empirical work connected learning objectives TEfS, this paper links these outcomes, or what student teachers learn individual course offerings, the process—how they learn...

The effects of F? concentration, leaching temperature, and time on the Ti from Ti-bearing electric furnace slag (TEFS) by [NH4+]-[F?] solution process was investigated to reveal mechanism kinetics titanium. results indicated that rate obviously increased with increase temperature concentration. kinetic equation obtained, activation energy 52.30 kJ/mol. fitting equations calculated values both T...

the purpose of this study was to conduct a quantitative risk assessment for pah exposure forconsumers at a night market in taiwan. the major methods assessed potential risk under different exposure scenarios based on bap equivalent concentration (bapeq) and incremental lifetime cancer risk (ilcr) models. we performed experimental sampling at a night market from 27 october through 22 november 20...

This paper presents an empirically study on the attitudes of female university students at all Teacher Education Faculties in Serbia (TEFS). For purposes this study, a survey was prepared to be completed by online, and virtual exponential non-discriminative snowball sampling applied. The independent variables were religion, major subjects, year age, completion secondary schooling, whether optio...

Reducing rotor aerodynamic noise is an important challenge in helicopter design. Active flap control (AFC) on rotors effective reduction method. It changes the segment airfoil shape, load distribution, and wake path of flow by adding trailing edge flaps (TEFs). Although AFC easily simulated, relevant experiments have not been widely conducted due to test technical problems limited financial sup...

This paper develops a nonlinear mid-fidelity aeroservoelastic model for smart rotor wind turbines and studies the turbulent load alleviation of with trailing edge flaps (TEFs) actuated by novel proportional-derivative model-free adaptive control (PD-MFAC) algorithm. contains structural tower blades represented geometrically non-linear composite beams an aerodynamic using vortex panel method cou...