Face stability is one of the key considerations for safe construction during earth pressure shield tunnelling. Both dynamic excavation cutterhead and spatial variability soil are widely reported to notably affect face stability. This study therefore proposed a three-dimensional random large-deformation computational framework explore combined effect these two factors on stability, via coupled Eulerian-Lagrangian (CEL) technique Monte-Carlo simulations. The findings demonstrate that...

Surface/shape inspection is a common and highly repetitive task in the factory production line. Using robots to automate process could help reduce costs improve productivities. In robotized surface/shape application, planning problem find near-optimal sequence of robotic actions that inspect surface areas target objects minimum cycle time, while satisfying coverage requirement. this paper, we propose novel computational framework automatically generate efficient path online for application....

Intensifying air pollution, especially airborne particulate has attracted growing public concerns due to its widespread and harmful effects on humans. Air filtration technology received increasing attention as an effective solution, the development of high-efficiency, low-resistance materials have become a common pursuit. Electrospun electret fibers are recognized promising candidate for high-performance filter media, benefiting from their in-situ charge injection during fiber forming, which...

Nowadays, it is a research hotspot to realize the controllability of polymer crystal structure in nanocomposites. However, crystals induced by two-dimensional filler always exhibit random orientation, which somewhat limit improvement physical properties materials. In current paper, dynamic Monte Carlo simulations were performed explore methods preparing with uniform orientation. Heterogeneous nucleation deformed loops grafted on can induce appearance special nanohybrid shish-kebab (NHSK)...

To support next-generation power grid monitoring, protection, and control, we re-view synthesize the new requirements challenges of enabling data architecture. We outline necessary elements a framework for architecture including path, synchronization alignment layer, high-speed stream processing, databases, service interaction with analytics & control applications. select discuss wide-area damping representative real-time closed-loop application, as use case to demonstrate proposed

Superparamagnetic iron oxide particles with average size less than 20 nm were prepared by chemical co-precipitation method in the air atmosphere. After that, polydimethyldiallyl ammonium chloride (PDDA) was used for wrapping to obtain core/shell nanocomposites. The parameters influencing properties of and oxide/PDDA nanocomposites investigated optimized. characterized X-ray diffraction (XRD) measurement, transmission electron microscopy (TEM), particle Zeta potential analyzer, Fourier...

ABSTRACT Crop microbiomes are widely recognized to play a role in crop stress resistance, but the ecological processes that shape under water unclear. Therefore, we investigated bacterial communities of two oat ( Avena sativa ) and wheat Triticum aestivum genotypes different conditions. Our results show microbial assemblage was determined by compartment niche. Host selection pressure on community increased progressively from soil epiphyte endophyte pathways, leading decrease diversity...

With the increase of application electric and electronic devices in space nuclear power stations, polymer insulating materials are inevitably exposed to various kinds environments. As technology advances, increasing demands on reliable operation under operating environmental conditions made components. Therefore, it is important investigate influence radiation polymeric used combined This paper describes effects magnetic field gamma-ray irradiation tracking failure polybutylene naphthalate...

Oily particles pollution poses a tremendous threat to people's health, so it is urgent develop air filtration materials with the ability of removing fine oily effectively. In this study, nylon 6 multi-stage structured nanofiber membrane (PA6 MSNM) for effective was designed and fabricated by adding certain amount tetrabutylammonium hexafluorophosphate (TBAHP) via one-step electrospinning. The PA6 MSNMs were composed coarse trunk fibres branching fibres. Benefiting from properties small pore...

Abstract (SiO 2 ) f /SiO composites reinforced with three-dimensional (3D) six-directional preform were fabricated by the silicasol-infiltration-sintering method. The nominal fiber volume fraction was 47%. To characterize mechanical properties of composites, testing carried out under various loading conditions, including tensile, flexural, and shear loading. composite exhibited highly nonlinear stress-strain behavior all three types results indicated that 3D braided superior flexural good...

Fibrous air filtration materials are highly desirable for particle removal from high-temperature emission sources. However, the existing commercial filter suffer either low efficiency or high pressure drop, due to difficulty in achieving small fiber diameter and porosity simultaneously. Herein, we report a facile strategy fabricate mechanical robust fibrous aerogels by using dual-scale sized PAI/BMI filaments fibers, which derived wet spinning electrospinning technologies, respectively. The...

Abstract Given the current situation and major problems in development of water affairs informatization Shenzhen, we put forward following objectives for construction a smart management system – “to see whole view through one map”, know everything click”, monitor all station” manage - resource machine”. To meet these objectives, proposed an overall framework consisting five levels (intelligent sensing, infrastructure, big data affairs, intelligence application portal), two main sub-systems...

Due to the weathering process, diorite-porphyrite dikes break up into a soil–rock mixture (SRM), which is crucial stability of dams and reservoirs that are under frequent fluctuations water level. However, grain transformation mechanical behavior SRM during have rarely been studied. This study aims investigate effect dominant size content on shear properties SRM. Therefore, sequence simulates change in particle process will be proposed series direct tests performed samples two-dimensional...

Flaws existing in rock masses are generally unparallel and under three‐dimensional stress; however, the mechanical cracking behaviors of specimens with two flaws triaxial compression have been rarely studied. Therefore, this study conducted comprehensive research on coalescence behavior properties compression. Triaxial compressive tests were different confining pressures rock‐like preexisting but varying flaw geometries (with respect to inclination angle flaws, bridge length, angle). Six...