Research and Implementation of the Link Adaptation on BroadbandWireless Ad Hoc Network

宽带无线自组织网具有不依赖网络基础设施、抗毁性强等特点，被广泛运用于各种特殊场合，如军事通信，应急通信等场合。由于无线传输信道是一个多径衰落、随机时变的信道，把基于自适应调制编码技术（AMC）和混合重传技术（HARQ）相结合的链路自适应技术应用于宽带无线自组网系统，这对提高系统的可靠性和有效性是非常有意义的。 首先，本文分析并论证了AMC和HARQ系统的辅助技术，包括信道估计，信噪比估计，以及信道预测。主要分析了信道预测技术，通过仿真得到适合本系统使用的长期信道预测自适应算法。这种算法实现简单，占用资源少，能够在一定条件下满足性能要求。 其次，本文以设计适合宽带无线自组网的AMC-HARQ...Wireless broadband Ad Hoc network does not rely on the default network foundation,has the advantages of convenient network build-up and strong invulnerability, it is widely used in various special occasions, such as military communications, emergency communication and so on. Because the wireless transmission channel is multi-path fading and random time-varying, joint Adaptive Modulation and Coding...学位：工学硕士院系专业：信息科学与技术学院通信工程系_信号与信息处理学号：2332008115331

酸活化对蛭石表面酸性的影响及其机理

蛭石是一类重要的2:1型层状硅酸盐矿物。其结构单元层由上下2个硅氧四面体片之间夹一镁(铝)氧八面体片组成。蛭石结构中存在广泛的类质同象置换,如,四面体片中Al~(3+)、Fe~(3+)等置换Si~(4+),以及八面体片中少量的Fe~(3+)、Fe~(2+)和Al~(3+)等置换Mg~(2+)。类质同象置换导致蛭石结构层往往带负电荷,这些净负电荷主要由层问可交换阳离子(Mg~(2+)、Ca~(2+)、Na~+和K~+)来补偿。上述独特的结构决定蛭石具有较高的阳离子交换容量、良好的热稳定性和热膨胀性。并且,类质同象置换还赋予蛭石结构中

精子DNA碎片率及顶体酶活性对男性不育的诊断价值

【目的】探讨精子DNA碎片率与顶体酶活性检测对男性不育的诊断价值。【方法】回顾性分析近三年 前来本院就诊的902例男性患者的精液常规参数及精子DNA碎片率和顶体酶活性水平。【结果】按DNA碎片率水 平将所有患者分为4组（≤10%，11~20%，21~30%，≥31%），各组患者的年龄、精子浓度、精子总活力、前向运动率以 及顶体酶活性存在统计学差异；按精子顶体酶活性正常与否将患者分为两组后，两组间精子浓度、精子总数、精子 总活力、前向运动率、正常形态率、畸形精子指数、DNA碎片率均有统计学差异。相关性分析显示，DNA碎片率与精 子浓度、精子活力、前向运动率、精子总数及顶体酶活性呈负相关关系，与畸形精子指数呈正相关关系；顶体酶与精 子浓度、精子活力、前向运动率、精子总数、正常形态率呈正相关关系，与头部异常率、畸形精子指数、DNA碎片率负 相关。【结论】精子DNA碎片率及顶体酶活性水平均可以在一定程度上反映精子参数水平，其中DFI更能反映精 子活力水平，顶体酶活性则与精子形态更为相关。两者都是精子质量评估更为客观而全面的指标

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^