Vegetation can signiˆcantly contribute to stabilise sloping terrain by reinforcing the soil: this reinforcement depends on the morphological characteristics of the root systems and the tensile strength of single roots. This paper describes an investigation on the reinforcing eŠect of soil-root matrix in the laboratory using a modiˆed large shear box apparatus (300 mm×300 mm). Four diŠerent spec...

BACKGROUND The purpose of this study is to evaluate the use of Tono-Pen XL in measuring IOP during the application of a suction ring in rabbit eyes with manometrically controlled IOP. METHODS Tono-Pen XL was calibrated against direct manometry in 10 rabbit eyes. A suction ring was then applied in 4 rabbit eyes and the IOP was determined manometrically during suction ring application at 350 mm...

BACKGROUND Negative pressure drainage has been shown to be an effective treatment of chyle fistula. However, the optimal level of negative pressure has not been determined. We therefore conducted a prospective randomized trial to address this issue. METHODS In all, 21 patients with chyle fistula were randomly assigned to a high negative pressure suction (HNPS) group (-600 mmHg, n = 10) or low...

A mathematical model has been built which includes thermodynamic, mechanical and generator models. Then, the starting procedure of scroll expander driven by compressed air has been simulated. The rotating speed and stable time influenced by the suction pressure, discharge pressure and load resistance have been analyzed. The results show that the starting procedure of scroll expander is determin...

The geogrid-reinforced soil structures play important roles in the reinforcement applications since 1980s. Generally in design of the geogrid-reinforced soil structures, the soil-geogrid interaction behavior is not directly considered. Instead, the interaction strength is represented by the consolidation drained strength of soil commonly. However, neglecting the effect of compaction and suction...

A non-linear gas dynamic model is used in this paper to study the pressure pulsations in the intake of a variable speed compressor, since the perturbation pressure in this study is so large that the linear acoustic theory is no longer valid. Friction and heat transfer are considered in the model. Three numerical schemes are applied to solve the governing equations which are non-linear hyperboli...

RATIONALE High-frequency jet ventilation (HFJV) is often used to treat infants with pathologies associated with gas trapping and abnormal lung mechanics, who are sensitive to the adverse effects of suction. OBJECTIVE This study aimed to investigate the effect of closed suction (CS), catheter size, and the use of active post-suction sighs on tracheal pressure (P(trach)), and global and regiona...

Abstract Collapsible soils are almost found in unsaturated states and involved significant engineering problems. Geotechnical challenges of such represented by the hydro-mechanical behaviour during wetting–drying cycles due to humidity climate conditions. The main objective this paper is investigate soil–water characteristic curve (SWCC) collapsible soils. In study, three types were investigate...

the unsteady flow in porous medium of a viscous incompressible fluid bounded by two parallel porous plates is studied with heat transfer. a uniform and constant pressure gradient is applied in the axial direction whereas a uniform suction and injection are applied in the direction normal to the plates. the two plates are kept at constant and different temperatures and the viscous dissipation is...

Most soil mechanics theories are limited to strain hardening and shrinkage under high compressive stresses, there some shortcomings in the selection of suction or degree saturation as water content state varies constitutive models unsaturated soil. Based on triaxial shear tests compacted (a silt plasticity) with different confining pressure (low-confining), a dilatancy model based mass is propo...