檢索結果 - Long Chen

We propose and experimentally demonstrate one novel scheme to improve the performance of the vector millimeter-wave (mm-wave) signal generated by intensity modulator based on optical carrier suppression. The phase distribution of the vector mm-wave signal after one square-law photodiode detection be...

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In this paper, we propose and experimentally demonstrate a millimeter-wave (mm-wave) system at 75 GHz with discrete Fourier transform spread (DFT-S) orthogonal frequency-division multiplexing (OFDM) signal transmission. The baseband signal is modulated by a directly modulated laser at the...

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<h4>Purpose</h4>Network meta-analysis (NMA) is a comparatively new evidence-based technique in medical disciplines which compares the relative benefits associated with multiple interventions and obtains hierarchies of these interventions for various treatment options. We evaluated the ef...

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At present, there are few researches on erosion caused by flow field changes at different manifolds.Based on the computational fluid dynamics(CFD)simulation technology, the erosion behavior of T-tubes with four different manifolds, i.e., common, spherical, ellipsoidal and shuttle shaped, was studied...

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A coal water slurry gasifier cinder was selected as the research subject to investigate its physical properties, including density, particle size and SEM morphology. The influence of temperature, oxygen concentration and heating rate on the combustion characteristics of ash slag was examined through...

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Fine particulate matter (PM_2.5) plays a major role in haze, and studying its spatio-temporal dynamics and influencing factors is crucial for improving air quality. However, previous studies have often obscured the spatio-temporal interactions of PM_2.5 an...

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Aiming at the characteristic of a variable and optimized steering ratio of the Steer-by-Wire System (SBW), this paper studies the design method of the steering ratio starting from the influence of the steering ratio on the vehicle steering maneuverability and the driver’s steering burden. Through th...

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The study seeks to investigate the cultural factors of Chizhou Nuo masks and their strategic application strategies in contemporary design, by compiling the Chizhou Nuo cultural literature, integrating memetics, identifying the cultural factors of the Chizhou Nuo masks, and then developing the genet...

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Abstract To assess the beneficial effects of delivery room continuous positive airway pressure (DRCPAP) in extremely preterm infants, a single‐center retrospective study was performed at the Women and Children's Hospital of Chongqing Medical University in China. Infants born between January 201...

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Low-cost MEMS sensors are widely utilized in UAV platforms to address attitude estimation problems due to their compact size, low power consumption, and cost-effectiveness. Diverse UAV payloads pose new challenges for attitude estimation, such as magnetic interference environments and high dynamic e...

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To enhance the mechanical properties of M50 bearing steel, particularly its impact toughness, a novel electroshock treatment (EST) process was proposed, and the changes in its microstructure were analyzed in detail in this study. The results indicate that when the EST time is 100 ms, EST can enhance...

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C20H16N4OCl3Cu2, triclinic, P1‾ $P\overline{1}$ (no. 2), a = 8.2232(13) Å, b = 10.8897(18) Å, c = 11.3838(19) Å, α = 93.394(5)∘, β = 94.248(5)∘, γ = 91.588(5)∘, V = 1013.6(3) Å3, Z = 2, Rgt (F) = 0.0445, wRref (F 2) = 0.1203, T = 273 K.

An experimental study was performed to determine the characteristics and drying process of mushroom (Lentinus edodes) by 6 different hot-air drying methods namely isothermal drying, uniform raise drying, non-uniform raise drying, uniform intermittent drying, non-uniform intermittent drying and combi...

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Chinese cabbage (Brassica rapa subsp. pekinensis) suffers from soft rot disease caused by Pectobacterium carotovorum (Pc). To uncover the mechanisms underlying the defense response of Chinese cabbage to Pc, we constructed a suppression subtractive hybridization (SSH) library from Pc-infected cabbage...

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In recent years, micro-electro-mechanical system(MEMS) has been developed rapidly, but the problem of friction and wear between micro-components in which relative motion occurs in the system has not been well resolved, limiting its further widespread application and in-depth development. In this pap...

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ABSTRACT Sexual dimorphism is common among insects. However, whether dimorphism influences the wing loading (i.e., body mass per unit wing area) and scaling relationships among body parts in beetles has seldom been explored. Here, we examined Holotrichia oblita (Coleoptera: Scarabaeidae) gender diff...

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Abstract There is a lack of research on whether tree size affects lamina and petiole biomass allocation patterns, whereas the trade‐off between leaf biomass allocated to the lamina and the petiole is of significance when considering the hydraulic and mechanical function of the leaf as a whole. Here,...

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Arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) plants exhibit distinct litter quality characteristics and nutrient uptake strategies that critically influence soil carbon and nitrogen cycling. However, the effect of mycorrhizal type on soil organic carbon (SOC) accumulation remains unclear, p...

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Distributed-drive electric vehicles (DDEVs), through independent, rapid, and precise control of the driving/braking torque of each wheel, offer unprecedented opportunities to enhance their handling stability, ride comfort, energy economy, and safety. However, their inherent over-actuation characteri...

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Rapid urbanization has substantially increased the complexity of urban underground spaces. This complexity leads to frequent road collapse incidents that pose significant threats to the safety and property of urban residents. Therefore, accurate methods of performing early road collapse risk assessm...

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