Ground settlement is often the most serious concern when tunneling under an old city with numerous historic monuments. A successful engineering design under these conditions would require getting the most out of the ground strength parameters and avoiding any weakening maneuver throughout the operation. Knowing that surface settlement is highly affected by tunneling parameters in EPB shield tun...

Abstract Novel Nickel–Titanium (NiTi)-based shape memory alloy (SMA) pipe couplers were designed and developed. They are suitable for room-temperature ultrahigh vacuum (UHV) systems provide a quick compact solution at reasonable cost. Their use is particularly interesting restricted-access areas of particle accelerators as their installation/dismounting can be performed remotely by temperature ...

The main objective of this work is to propose a mathematical model for the differential sticking coefficient of clayey drilling fluids with a lubricant as an additive and evaluate the influence of differential pressure and lubricant content on filter cake thickness and permeability. Tests were carried out on fluids composed of water and 4.86% of active bentonite clay prepared in Hamilton Beach ...

Objective: To determine the biomechanical effect of an intervertebral spacer on construct stiffness in a PVC model and cadaveric canine cervical vertebral columns stabilized with monocortical screws/polymethylmethacrylate (PMMA). Study Design: Biomechanical study. Sample population: PVC pipe; cadaveric canine vertebral columns Methods: PVC model – PVC pipe was used to create a gap model mimicki...

Particle reinforced composites represent a large group of materials used in a variety of applications, such as concretes and solid rocket propellant. The mechanical behavior of these materials depends on properties of constitutes and any microstructural changes that may occur in the body under loading. Generally, particles are applied to high stress in these composites. Heterogeneity plays an i...

Additive manufacturing is one of the key technologies for future production complex and individualised components. One most challenging questions to minimize cost reuse powder leftover after building process. This study investigates influence on mechanical properties when reusing out process chamber up four times. Tensile test specimens are produced investigated. The results show a decreasing i...

a r t i c l e i n f o Keywords: InSAR Multi-temporal InSAR Subsidence Aquifer Fault Oil field Salt dome Houston Houston–Galveston (HG) region in Texas has been subsiding due to the combined effects of groundwater withdrawal , hydrocarbon extraction, salt dome movement, and faulting. This human-and partially nature-induced ground deformation has gradually threatened the stability of urban infras...

Growing plant cell walls characteristically exhibit a property known as 'acid growth', by which we mean they are more extensible at low pH (< 5) (1). The plant hormone auxin rapidly stimulates cell elongation in young stems and similar tissues at least in part by an acid-growth mechanism (2, 3). Auxin activates a H(+) pump in the plasma membrane, causing acidification of the cell wall solution....

Concerning a Fe-Mn-Si shape memory alloy, it was thought of magnetic measurements to follow the evolutions with temperature of an as quenched steel before and after a 2.5% prestrain. INTRODUCTION The shape memory effect, related to the reverse E -. y transformation of a single crystal of FeMn-Si, was fist shown by Sato (1). Many works are devoted to polycrystalline Fe-Mn-Si steels (2,3). The E ...