Particle breakage has a crucial impact on the dilatancy and critical state of calcareous sand. This study performed several triaxial experiments sand samples to describe stress–dilatancy relationship The experimental results revealed that friction angle always is lower than mobilized for shear resistance correlates with particle breakage. In addition, highly affected line in conducted tests. By introducing concept parameters, this established modified equation considering under theoretical...

Calcareous sand is a widely used foundation material in marine engineering. Particle breakage can lead to an increase its compressibility, affecting the safety and stability of structures. The compression characteristics particle effects calcareous were analyzed through 33 sets confined tests using specimens. initial void ratios specimens set between 1.0 1.3, three gradations selected: 1–2 mm, 0.5–1 mm 0.25–0.5 mm. Moreover, loading–unloading–reloading conducted. test was loaded maximum 2...

This report details a rare case of paraneoplastic pemphigus (PNP) associated with pheochromocytoma. The patient presented prominent dermatological manifestations, including erythema, vesicles, and erosions. During hospitalization, diagnostic imaging revealed retroperitoneal mass, which was subsequently surgically removed. A comprehensive workup, CT, MRI, histopathological analysis, direct immunofluorescence examination, conducted. Postoperative management combined pharmacological...

With diminishing natural aggregate resources and increasing environmental protection efforts, the use of recycled fine is a more sustainable approach, although challenges persist in achieving comparable mechanical properties. Exploration into incorporation steel fibers with has led to development steel-fiber-reinforced concrete. This study investigates shrinkage performance compressive constitutive relationship fiber concrete different dosages. Initially, based on replacement rates coarse...

Excavation in foundation pits can result serious issues for nearby tunnel structures like deformation, differential settlement, and seepage damage, which profoundly impact project timelines potentially endanger life property safety. Therefore, it is imperative to investigate these impacts before after construction facilitate timely adjustments of measures reinforcement where possible. In this study, a pit near rail transit line employed as case comprehensive study the on-site deep excavation...

Abstract Current ventilators rely on wall outlets or cylinders for oxygen supply, which limits their continuous use in the field emergencies. In this study, we proposed a ventilator prototype that can achieve stand-alone oxygenated respiratory support, by designing and integrating high-performance generator, optimizing control strategies of whole system. Based designed oil-free scroll compressor pressure swing adsorption (PSA) system, first realized mobile high-flow achieved an output flow...

Particle geometric is a key parameter that defines the eometric attributes of calcareous sand particles and intricately related to their mechanical traits, such as compression shear. The scanning electron microscopy digital imaging were applied capture microscopic properties projections sand. qualitative analysis, conventional statistical methods fractal theory employed describe morphology particles. Additionally, we analyzed structural physical traits based on its unique biological genesis....

The global prevalence of diabetes is on the rise, with its pathogenesis closely related to renin-angiotensin system (RAS) that includes classical antagonistic pathway and ACE2-Ang-(1-7)-Mas axis. Despite well-documented role in cardiovascular health, potential mechanisms by which RAS associated require further study. interacts metabolic regulatory factors such as obesity autophagy. Excessive activation Ang II-AT1 receptor can contribute insulin resistance diabetic complications. This review...

Hydraulic engineering projects in high-altitude environments are subject to significant diurnal temperature variations, necessitating concrete with high freeze–thaw resistance. Aggregates play a crucial role the durability of concrete. However, impact different parent rock types on concrete’s resistance remains underexplored. This study investigated effect five common coarse aggregate types—granite (Gr), tuff (Tu), sandstone (Sa), limestone (Li), and pebble (Pe)—on dam subjected cycles. The...

Abstract The particle breakage effect and compression characteristics of calcareous sand are related to the water content in material. However, effects on have rarely been investigated. In this work, 50 sets confined tests were conducted specimens, two single-particle-size groups (particle size ranges 1–0.5 mm 0.5–0.25 mm) investigated under five different contents. test results showed that with increase content, final deformation was positively correlated content. decreased when reached a...

Particle breakage, which is affected by the stress path, a key factor influencing mechanical properties of granular geomaterials. According to results triaxial tests conducted on geomaterials under different paths, particle breakage model considering effects path was established in this study, and mathematical expression method determine parameters were established. The indicated that integral function plastic strain increment can be used describe variation paths; however, influence should...

Fragile angular-shaped granular materials, such as calcareous sand, rockfill material, and ballast, show complex stress–strain–volumetric relationships due to the effects of particle breakage. This paper presents a proposed constitutive model simulate breakage on mechanical response sand materials in drained triaxial tests previously conducted by other researchers. Experimental results revealed an increase roundness decrease critical stress ratio with increased these materials. A parameter...

Stress path is a key factor affecting the particle breakage of calcareous sand. In this study, effects stress variations on sand were investigated through triaxial compression tests across four distinct paths. Additionally, gradation evolution during was analyzed. Furthermore, correlation between total input energy and characteristic size dissipation analysis. The results indicated that relative index increases gradually with an increase in maximum deviatoric final volumetric strain,...

Integrating wireless sensor networks (WSNs) into the service-oriented architecture poses many research challenges. One of these challenges is how to apply Web services resource constrained WSNs in terms communication and computation capabilities. Another challenge build power-aware data streaming for WSNs. This paper addresses serviceability issues using framework (WSRF) under open grid service (OGSA). It also issue power efficiency application that are built on WSRF provides a query...

Nickel laterite ore is divided into three layers and the garnierite examined in this study belongs to third layer. Garnierite characterized by high magnesium silicon contents. The main contents of are silicates, nickel, iron, exist silicates form lattice exchange. Silicate minerals difficult destroy so suitable for smelting using high-temperature pyrometallurgy. To solve problem large amounts slag produced inability recycle traditional pyrometallurgical process, we propose a vacuum...

Vehicular ad hoc network (VANET) has been brought out to revolutionize driving experiences and traffic flow control systems. In a VANET, roadside units (RSUs) are usually used collect messages sent by nearby vehicles, which may include status information of vehicles emergency events. Currently, batch verification is considered as an effective approach verify these in VANETs. However, existing scheme, the fails even one signed invalid. this paper, we introduce efficient identity-based...