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WhatsApp: +86 18221755073Cellulose in lignocellulosic biomass is difficult to hydrolyze during enzymatic hydrolysis. To further simplify the pretreatment process in high solid loading on the premise of reducing the consumption of chemical reagent and energy, an effective one step mechanochemical (combines wet ultrafine grinding (WUG) with alkaline hydrogen peroxide …
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WhatsApp: +86 18221755073In this study, an ultrafine-grained (UFG) NbMoTaW alloy with high grain-boundary cohesion was prepared by powder metallurgy, taking advantages of rapid hot-pressing sintering and full-process inert atmosphere protection from powder synthesis to sintering. By oxygen control and an increase in the proportion of grain boundaries, the segregation ...
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WhatsApp: +86 18221755073Abstract. Ultrafine particles are airborne particulates of less than 100 nm in aerodynamic diameter. Examples of ultrafine particles are diesel exhaust particles, products of cooking, heating and wood burning in indoor environments, and more recently, products generated through the use of nanotechnology.
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WhatsApp: +86 18221755073The ultrafine cement with a particle size of 15 μm and a density was 2.2 g/cm 3, and the mass fraction of each substance measured by the XRF test is shown in Table 1. Class II fly ash [28] and silica fume were used as mineral admixtures, and their basic physical parameters are shown in Table 2, Table 3. GO was prepared by the improved Hummers ...
WhatsApp: +86 18221755073However, little is known about the possible impact of ambient ultrafine particles (<0.1 μm) (UFPs) on childhood cancer incidence. Objective: This study aimed to evaluate the association between prenatal and childhood exposure to UFPs and development of childhood cancer.
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WhatsApp: +86 18221755073Ultrafine particles are defined as having a diameter less than 0.1 μm (or 100 nm). Engineered nanoparticles (nanomaterials) are a subset of ultrafine particles with dimensions from 1 to 100 nm. Nanomaterials are produced and used for industrial and high-tech applications, while ultrafine particles are the byproducts of combustion and other ...
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