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协作频谱感知是认知无线电网络的基础和关键阶段，频谱检测过程中的节点分配策略将直接决定联合频谱感知的结果。介绍了多种分配认知终端的方法，旨在提高频谱感知的效率和公平性。针对不同子频带的感知效率，提出了一种称为由频点占用导致的无效传输参数（inefficient transport parameter，ITP）指标来评估通信性能，给出了感知效率优化问题的闭式表达解，设计的场景包括终端对相同频带有不同的感知性能和相同的感知性能。针对不同子频带间的感知公平性，提出了两种分配算法：弓形分配算法和类划分分配算法。子频带间的公平性通过评估子带中最差的感知性能进行衡量。为了适用于实际场景，加入了频段属性参数来增强公平性，该参数考虑了主用户使用不同频段的优先级及抗干扰能力。仿真结果表明，所提出的策略显著改善了认知无线电网络中的ITP，特别是在子频带利用率不同的情况下，提出的弓形分配算法在公平性不明显降低的情况下，复杂度有明显改善。

【目的】探讨椎旁注射臭氧对SD大鼠盘源性疼痛模型的镇痛规律，对椎间盘退变的影响，并初步探讨其镇痛作用机制。【方法】65只雄性SD大鼠随机分为对照组、模型组和臭氧组。模型组和臭氧组大鼠经皮穿刺L5-6椎间盘全层纤维环制作SD大鼠盘源性疼痛模型，臭氧组在造模后第22天椎旁注射25mg/L臭氧1mL，对照组大鼠不作处理。手术前后各时间点使用定量痛觉敏感评估技术和磁共振检查实验动物的50%机械撤足阈值（50%MWT）和椎间盘Pfirrmann分级，并使用western blot检测左侧坐骨神经和背根神经节中肿瘤坏死因子α（TNF-α）和降钙素基因相关肽（CGRP）的表达。【结果】造模后第22天及以后各时间点，3组50%MWT两两比较差异均有统计学意义（P

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Objective: The current study aims to analyze the correlation between clinical parameters and number of circulating tumor cells (CTC) isolated from glioma patients and explore their possible clinical applications in early detection and prognosis prediction of glioblastoma patients. Methods: A total of 47 patients hospitalized in the department of neurosurgery of the First Affiliated Hospital of Nanjing Medical University between October 2018 and September 2022 were enrolled. All patients were clinically diagnosed with glioma. CTCBIOPSY® system was utilized for CTC isolation and counting both pre⁃operatively and post⁃operatively, after which hematological test results, radiology images and follow⁃up results were collected and analyzed to explore the possible relationships among parameters. Results: CTC was detected in 87.2% (41/47)of patients pre ⁃ operatively. GBM patients showed significantly higher CTC level than non⁃GBM patients (P=0.020). The combination of pre⁃operative CTC level and neutrophil to lymphocyte ratio could aid the diagnosis of GBM. A decrease in post ⁃operative CTC levels was observed in GBM patients and the changes were statistical significant compared with non⁃GBM patients (P=0.004). GBM patients were further divided into two groups that designated hig⁃CTC group and low⁃CTC group based on a cutoff value of the pre⁃operative CTC ≥11 per 5 mL of peripheral venous blood. Statistical significance was observed in white cell count (P=0.017), neutrophil count (P=0.031), and lymphocyte count (P=0.018), but not in radiology features. Follow⁃up data of GBM patients showed significantly shortened overall survival in high⁃CTC group than low⁃CTC group (P=0.017). Conclusion: Pre⁃operative CTC counting readily distinguishes GBM from non ⁃GBM patients and predicts adverse prognosis in GBM patients with higher pre ⁃operative CTC number. It is a feasible candidate marker to aid the diagnosis and prognosis prediction of GBM. [ABSTRACT FROM AUTHOR]

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The circular membrane solar array has attracted extensive attention due to its high storage ratio and strong power supply capability. In order to adjust the tension of large film structures, a tension adjusting device composed of ropes and springs is usually introduced, and its mechanical characteristics are highly nonlinear, with the effects rarely studied yet. Aimed at the tension adjustment, a mechanism model was proposed. The nonlinear dynamics equation for the 2DOF system was established with the Lagrangian energy method. With an engineering prototype as the example, the responses of the tension mechanism with unsymmetrical ribs under resonance excitation were studied. The results show that, the change of the excitation amplitude has an important influence on the characteristics of the beat response of the system. Consequently, the responses of the system exhibit chaotic, almost periodic and multifold periodic phenomena. The research makes an important reference to the parameter design of tension mechanisms. [ABSTRACT FROM AUTHOR]

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Spatiotemporal variation of nitrate (NO3 ¯ ) and isotope components were investigated in the karst and non-karst sub-basins, to clarify the influence of hydrogeological conditions and underlying surface properties on the source and migration of nitrate in water. The research areas were selected as the Mudong and the Jingui sub-basin in the Qingshitan Reservoir Irrigation District of Lijiang River Basin in southwest China. Both small karst watersheds were also dominated by agricultural activity. Multiple isotopes (δD-H2O, δ18O-H2O, δ15N-NO3 ¯, and δ18O-NO3 ¯ ) and the Bayesian Model Stable Isotope Analysis in the R (SIAR) model were applied to compare the multiple potential nitrate sources in the water. The results indicated that the spatial and temporal variation of nitrate in water depended on the hydrogeological conditions and the associated topography, soil characteristics, and land use types of the sub-basin. Total nitrogen (TN) was mainly formed by NO3 ¯ and NH4 + in the river, where the proportion of NO3‾ was slightly higher while decreasing along the river. TN was overwhelmingly dominated by NO3‾ in the shallow groundwater. Nitrification was the dominant process of NO3 ¯ formation and transformation. The Jingui sub-basin included the woodland with a thicker soil layer, while the Mudong sub-basin was mainly agricultural land with the karst development and the discontinuous thin soil layer. The ranges of mean NO3 ¯ concentration (0.19-15.84 mg/L), and the isotope values of δD-H2O (from -44.08‰ to -19.63‰), δ18O-H3O (from -7.24‰ to -1.55‰), δ15N-NO3 ¯ (from -1.65‰ to 53.98‰), and δ18O-NO3 ¯ (from 0.04‰ to 13.74‰) in the Mudong sub-basin, were all greater than those in the Jingui sub-basin. In terms of spatial distribution, the mixing of nitrogen fertilizer infiltration from the orchard of exposed karst stone mountain in the north recharge area and manure & septic waste infiltration from the village groups were not smoothly dispersed and discharged in the central tectonic basin region, resulting in the high concentration of NO3 ¯ (the mean concentration range from 11.96 to 15.84 mg/L) and the high isotope value of δ15N-NO3 ¯ (from 0.65‰ to 28.23‰) and δ18O-NO3 ¯ (from 2.46‰ to 14.43‰) in the water of G4-G7 wells. The contributions of NO3 ¯ sourced from the soil nitrogen in the dry season, as well as the manure and septic waste in the wet season in the Mudong sub-basin, were less than those in the Jingui sub-basin. The reason was the low capacity of water storage in the thin soil layer that was formed by the weathering of carbonate rocks, together with the strong permeability of the shallow soil layer in the Mudong sub-basin. Consequently, spatial and temporal variations of nitrate pollution and migration in water were achieved under karst hydrogeological conditions and underlying surface properties. The finding can provide decision support for the control of agricultural non-point source pollution and the improvement of the water environment in karst and non-karst areas. [ABSTRACT FROM AUTHOR]

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To study the vortex-induced vibration(VIV) of top tension risers(TTRs) under shear flow, the non-linear dynamic model of VIV for TTRs was constructed, in which the riser was simplified as an Euler-Bernoulli beam model and the van der Pol wake oscillator was used to describe the effect of fluid. Based on the 2 nd-order Galerkin modal discretization model, the harmonic balance method, the Poincaré mapping method and the Lyapunov exponential method were used to reveal the system response characteristics. The results show that periodic responses and quasi-periodic responses occur alternately with the increase of the flow velocity, and the periodic response region corresponds to the vortex-induced resonance region. The approximate periodic solution obtained with the harmonic balance method can predict the amplitude and frequency of the periodic solution in the vortex-induced resonance region, and the main frequency components of the quasi-periodic solution in the non-vortex-induced resonance region. [ABSTRACT FROM AUTHOR]

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