It is an intractable issue to improve the low-temperature SO2-tolerant selective catalytic reduction (SCR) of NOx with NH3 because deposited sulfates are difficult decompose below 300 °C. Herein, we established a self-prevention mechanism mesoporous-TiO2@Fe2O3 core–shell composites against sulfate deposition using experiments and density functional theory. The mesoporous TiO2-shell effectively restrained FeSO4 NH4HSO4 weak SO2 adsorption promoted decomposition on mesoporous-TiO2. electron...

Abstract Impregnated graphite has attracted considerable attention and been widely used as an ideal friction material in many fields. However, the influence of temperature on its tribological properties not clearly studied; furthermore, evolution mechanism transferred tribofilm is unknown. In this study, impregnated were investigated at different temperatures, carbon-based was also determined. The results revealed that significantly improved with increase temperature. coefficient wear depth...

Hydraulic structures are frequently subjected to soft-water or acidic environments, necessitating serious consideration of the long-term effects calcium leaching on durability concrete structures. Three types common Portland cement (ordinary cement, moderate-heat and low-heat cement) paste samples widely applied hydraulic were immersed in a 6 mol/L NH4Cl solution simulate accelerated behavior. The mass loss, porosity, depth, compressive strength, Ca/Si ratio three pastes measured at...

In this paper, standard maintenance and simulated field actual temperature are carried out. The compressive strength, splitting tensile axial elastic modulus its growth rate were tested. It is found that has a great influence on the mechanical properties of concrete. Among them, greatest strength. numerical difference test within acceptable range. shows research in laboratory good reference significance for situation field. Based N-S maturity formula, F-P equivalent age formula D-L proposed...

Two-dimensional (2D) nanocomposites as lubricant additives have been widely studied, but the synthetic process of is not always environmentally friendly or economical. In this study, a new 2D nanocomposite, Fe3O4/h-BN, has prepared by physical mixing exfoliated h-BN nanosheets and organically modified Fe3O4 nanoparticles. The nanocomposite displays unique 2D-layered structure without folds wrinkles. nanoparticles are uniformly dispersed on nanosheet surfaces with help an elegant...

Corrosion inhibitors play a vital role in impeding the corrosion process of steel bars within concrete structures exposed to corrosive environments. Nevertheless, conventional pose environmental risks. In contrast, contemporary studies have explored that are eco-friendly. However, these burdened by high costs and complex production processes, widespread application structures. Consequently, this study presents an innovative solution incorporating uniconazole, agricultural fungicide, as...

Non-food biomass such as corncob is a very abundant and promising feedstock for sustainable energy production in China.

Bacillus subtilis A-5 has the capabilities of high-molecular-weight γ-PGA production, antagonism to plant pathogenic fungi, and salt/alkaline tolerance. This multifunctional bacterium great potential for enhancing soil fertility security in agricultural ecosystem. The genome size B. was 4,190,775 bp, containing 1 Chr 2 plasmids (pA pB) with 43.37% guanine-cytosine content 4605 coding sequences. synthase gene cluster predicted consist pgsBCA factor (pgsE). γ-PGA-degrading enzymes were mainly...

Capacitive removal of metal ions from wastewater was demonstrated by using Ti–C redox interfaces created an ALD strategy.

Diatomaceous earth (DE), a kind of natural and environmentally friendly concrete admixture with good pozzolanic water absorption properties, is potential high-quality internal curing material. DE agent was prepared by calcining excavated diatomaceous applied in cement-based materials low water–binder ratio 0.35 to study its effects on the autogenous shrinkage early crack resistance materials. The results showed that microfine powder unique orderly microporous structure, main component SiO2,...

A spring-energized seal, whose PTFE plastic shell has excellent self-lubrication and a low temperature stability, is used widely in liquid fuel valves’ rotating end-face seals. However, practical application, larger effect on not only the physical tribological properties of materials, but also leakage performance rings. Thus, high sealing test seal that applies to an engine was carried out. In this paper, characteristics, friction torque wear characteristics ring under different temperatures...

The mechanical analysis of interlayer bonding problem asphalt pavement is performed by the elastic layered system theory or finite element method (FEM); then, a lot specialized programs based on above theories emerged successively, which BISAR3.0 and EverStressFE are quite representative. In order to further clarify characteristics for investigating pavement, this paper will carry out comprehensive comparison from specific realization viewpoint, such as principle bonding, modeling,...

Graphite-based composites are well recognized as ideal functional materials in mechanical seals, bearings of canned pumps, and electrical contact systems because their outstanding self-lubricating ability, thermostability, chemical stability. Working harsh conditions is a huge challenge for the graphite materials, tribological properties wear mechanisms not studied. In this study, performance metal-impregnated graphite, resin-impregnated non-metal-impregnated under high temperature load...

Low-heat Portland cement and ground granulated blast furnace slag are widely used for the preparation of hydraulic concrete. Nevertheless, effect mechanism corrosion on low-heat paste mixed with need to be further explored. This paper investigated impact calcium leaching by evaluating its mass loss, porosity, depth, compressive strength, Vickers hardness, comparing it performance ordinary paste. Furthermore, phase composition morphology containing were analyzed X-ray diffraction, mercury...

Magnetorheological fluid seal and brush are successful sealing forms. To address problems such as pole pieces colliding with spindles, precise clearance in magnetic seals, inevitable leakage this article combines the advantages of proposes a magnetorheological flexible pieces. The field was estimated using finite-element method capacity studied theory. Single structural parameters that affect relative permeability thickness were discussed. combined effects various analyzed. results show an...

Two-dimensional (2D) nanomaterials have attracted much attention for lubrication enhancement of grease. It is difficult to disperse nanosheets in viscous grease and the performances under harsh conditions urgently need be improved. In this study, 2D talc are modified by a silane coupling agent with assistance high-energy ball milling, which can stably The thickness size nanosheet about 20 nm 2 µm. successfully grafted on surface talc. Using modified-talc nanosheet, coefficient friction wear...

Purpose – This paper aims to introduce a new type of analysis method seek the actual working performance regulatable dry gas seal, including equilibrium film thickness, stiffness-leakage ratio and so on. Additionally, parametric optimization hydrostatic structure is completed for this kind seal. Design/methodology/approach From point axial force balance based on lubrication theory, method, Gas Film Divided Method, has been introduced. A four-factor three-level structural parameters test...

Alkali-activated cement (AAC) is a sustainable building material with low carbon emissions, but it has growing demand for raw materials. In this study, the potential of low-purity modified calcium bentonite (CB) as AAC was evaluated. The thermodynamic changes and pozzolanic properties calcined CB were determined using X-ray diffraction (XRD), thermogravimetry-differential thermal analysis (TG-DTA), zeta potential, strength activity index (SAI) test. compressive test, scanning electron...