Search Results - Pengfei Li

The global navigation satellite system (GNSS), using electromagnetic signals, enables continuous positioning throughout the entire surface of the Earth. However, underwater and underground environments significantly restrict the propagation of electromagnetic waves. The sole approach to aid position...

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This paper proposes a novel method for infrared and visible image fusion (IVIF) to address the limitations of existing techniques in enhancing salient features and improving visual clarity. The method employs a sub-window variance filter (SVF) based decomposition technique to separate salient featur...

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Anaerobic fermentation is a critical technology for the resource utilization of agricultural and livestock waste, with its efficiency and stable operation heavily reliant on the dynamic changes in volatile fatty acid concentrations. However, traditional gas chromatography methods are time-consuming...

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Effective control of the tunnel seepage field is crucial in water-abundant regions to ensure the safety and stability of underground structures. Therefore, it is imperative to investigate the effects of the geological factors and tunnel permeability parameters on the drainage capacities of such stru...

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Thermal modulation of a chaotic fire laser by using a phase-shifted fiber Bragg grating (PS-FBG) is proposed. In this chaotic laser system, a double-ring resonator model is employed, leveraging the laser self-mixing method. Specifically, one of the rings serves as the laser resonator cavity, while t...

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This study investigates the grain characteristics and high-temperature tensile properties of an additively manufactured (AM) TA15 titanium alloy. Directed energy deposition (DED) was utilized for its high material efficiency and design flexibility to explore the alloy’s applicability in aerospace ma...

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Urban green development has become a crucial approach for balancing ecological conservation and socio-economic development. The digital economy (DE) and new-type urbanization (NTU), as technological and social systems, respectively, are both driving urban green development. In this context, furtheri...

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Accretionary orogens form along convergent plate margins due to the ongoing subduction of oceanic lithosphere, and comprise accretionary prisms, magmatic arcs, back-arc domains, ophiolitic mélanges and possibly oceanic plateaus and continental fragments [Condie, 2007; Cawood et al., 2009]. Based on...

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Recently, China has become a hotspot for farming golden pompano (<i>Trachinotus ovatus</i>), a commercially valuable marine fish. The genetic mechanisms underlying ovarian development, particularly those regulated by insulin-like growth factors (IGFs), remain poorly understood. Existing...

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This study investigates the microstructure and mechanical properties of Inconel 718, a nickel-based alloy, reinforced with ceramic phases via additive manufacturing. Two reinforcement strategies were explored: in situ formation of ceramic phases through titanium powder addition, and direct incorpora...

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The north slope of the Tianshan Mountains (NSTM), an arid region in northwest China, faces challenges including human-land conflicts, water imbalances, and ecological fragility. As a key urban cluster in the nation's sustainable development plan, understanding land use change and future trends...

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The escalating industrial emissions have dramatically increased airborne particulate matter (PM), particularly submicron particles (PM0.3), creating substantial health risks through respiratory system penetration. Current fiber-based filtration systems predominantly relying on electrostatic adsorpti...

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Vegetation restoration is critical for improving soil quality and microbial community dynamics in degraded mining areas. This study explored the effects of different vegetation types (grassland, shrubland, and mixed grass–shrub areas) on soil physicochemical properties, organic carbon fractions, and...

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The depletion of freshwater resources and soil salinization caused by climate change and human activities significantly threatens to agricultural productivity in arid regions. The use of salt waste and brackish water for the production of Suaeda salsa vegetables and forage is a win-win strategy for...

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The prevalence of depressive-like behavior is significantly higher in patients with cholestatic liver disease, leading to a notable reduction in the quality of life. This situation underscores the urgent need to investigate the mechanisms underlying the association between cholestasis and clinical d...

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Curved mountain belts, commonly referred as to oroclines that result from bending of quasi-linear orogenic belts, have fascinated generations of geologists. Such structures are widely recognized in modern and ancient orogens, and are fundamentally important for understanding geodynamics of convergen...

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Phase unwrapping (PU) is a crucial step in interferometric synthetic aperture radar, as it directly influences the accuracy of surface deformation monitoring and topographic mapping. However, PU in disconnected regions due to surrounding low-coherence pixels and irregular terrain like islands remain...

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旨在为棉籽油硬脂的开发利用提供理论依据，以甲醇钠为催化剂，采用化学酯交换法对棉籽油硬脂进行改性，采用单因素实验考察了反应温度、催化剂添加量、反应时间对酯交换产物滑动熔点（SMP）和20 ℃时的固体脂肪含量（20 ℃-SFC）的影响，对酯交换产物相关指标进行了分析，并研究了脱臭对酯交换产物中环丙烯脂肪酸（CPFA）含量的影响。结果表明：棉籽油硬脂酯交换反应最佳工艺条件为反应温度80 ℃、催化剂添加量0.1%、反应时间30 min，在此工艺条件下酯交换产物的SMP和20 ℃-SFC分别为40.1 ℃和20.57%；相比于棉籽油硬脂，酯交换产物的SMP升高，酸值和过氧化值降低，塑性范围变宽，SUU型...

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Unique fucosylated chondroitin sulfate (FCS) extracted from the sea cucumber <i>Stichopus horrens</i> was subjected to deacetylation and deaminative depolymerization to generate oligosaccharide fragments containing anTal-diol, which were further purified to obtain the trisaccharide ShFCS...

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Recent advancements in AI have spurred interest in ferroelectric memristors for neuromorphic chips due to their ability to precisely control resistive states through polarization flip-flop without electroforming. However, oxygen vacancies in these devices often cause high leakage current, low endura...

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