Flying insects use the optic flow to navigate safely in unfamiliar environments, especially by adjusting their speed and their clearance from surrounding objects. It has not yet been established, however, which specific parts of the optical flow field insects use to control their speed. With a view to answering this question, freely flying honeybees were trained to fly along a specially designe...

The response of a massif to stresses generated by tunnel excavation depends essentially on the geological conditions, geometry and its underground position. major problem related construction these structures is ensure stability whole tunnel-ground, controlling various deformation during construction. In this context, present paper examines effect conditions behavior tunnels surrounding soil. s...

OBJECTIVE We quantify the geometric and hemodynamic characteristics of extracardiac and lateral tunnel Fontan surgical options and correlate certain anatomic characteristics with their hemodynamic efficiency and patient cardiac index. METHODS AND RESULTS The study was conducted retrospectively on 22 patients undergoing Fontan operations (11 extracardiac and 11 lateral tunnel operations). Tota...

Based on Spatial structure of the roadway, threedimensional geometric modeling of the roadway has been studied.It is separately gived that a detailed analysis of roadway centerline modeling, roadway cross-section modeling, roadway intersection modeling and an efficient data structure. Using VC++ and openGL, a specific test was carried out.This paper introduces a relevant algorithm in which the ...

Abstract Through the study of diameter control horizontal swirling efficiency shaft and tunnel cross-section aeration sill, a flood discharge with scale about 100 meters volume more than thousand is obtained. The energy dissipation type combined diversion tunnel. At time, can be controlled determined according to average velocity 15-20m/s; hole calculated empirical formula D=(Q 2 /g) 0.2 . In o...

carpal tunnel syndrome (cts) is the most common entrapment neuropathy. it accounts 90% of all entrapment neuropathies all over the world. ultrasound is a non-invasive, cost effective and available para-clinical method which could be applied for cts diagnosis. cross-sectional area of the median nerve at the level of the inlet is considered as a diagnostic criterion in cts cases. in this study, t...

The sharp change of stiffness in the soil-rock combination stratum is weak point seismic design tunnel structure. To explore influence vibration on shield tunnel, section Jinan rail transit line 4 at Olympic Sports Center used as research background. Firstly, two-dimensional numerical model established, and internal force calculation distribution law structure are studied. Then, based third sim...