基于复用分割技术的两跳蜂窝网的频谱分配方案

根据复用分割原则,提出2种新的两跳固定中继蜂窝网的频谱分配方案,即:侧重于覆盖面积的频谱分配方案和侧重于频谱效率的频谱分配方案.相对于侧重频谱效率的频谱分配方案,侧重于覆盖面积的频谱分配方案有较大的频谱复用距离,从而能够提供更好的链路质量,其重点在于解决覆盖问题.同时,相对于侧重覆盖面积的频谱分配方案,侧重于频谱效率的频谱分配方案的频谱复用距离较小,从而有更高的频谱利用率,其重点在于解决频谱效率问题.与基于信道借用的频谱分配方案及传统无中继频谱分配方案比较,理论分析和仿真结果表明,提出的侧重于覆盖面积的频谱分配方案能提供最好的覆盖,同时侧重于频谱效率的频谱分配方案能得到最大的面积频谱效率.     

具有最优代数免疫阶布尔函数的构造

给出了代数免疫阶,汉明重量,非线性度和相关免疫阶之间的关系,得出构造密码学综合性质较优的布尔函数的一种思想,给出构造方法,并给出了实例.     

首乌胶囊对青少年中长跑运动员免疫功能的影响

研究目的:观察具有增强免疫功能的中药保健品对运动员免疫功能的影响,探讨中药保健品在运动医学的应用前景。研究方法:受试者为男性青少年中长跑运动员,共13人,随机分为实验组与对照组,实验组服用具有增强免疫功能的中药保健品首乌胶囊,对照组不服用。以T淋巴细胞亚群、免疫球蛋白为观察指标,观察30天冬训前后,运动员免疫功能的变化。研究结果和结论:首乌胶囊能提高运动员CD4阳性细胞的比例,冬训后实验组与对照组CD4细胞比例改变量具有组间统计学差异(P≤0.05)。中药保健品在运动医学领域具有重要的应用前景。     

泡沫塑料中甲醛测定方法

泡沫塑料是通过将聚异氰酸酯与包括水和有机多元醇在内的含活泼氢的成分进行反应制成的,反应中会合成少量的甲醛分子。目前国内没有专门针对泡沫塑料中甲醛含量的检测方法,该方法针对泡沫塑料中甲醛含量的测定,描述了乙酰丙酮分光光度计法测定的基本方法和试验步骤。     

过度训练对大鼠肠道sIgA和血浆内毒素含量的影响以及谷氨酰胺的干预作用

目的:探讨过度训练对肠道slgA和血浆内毒素含量的影响及其谷氨酰胺的干预作用和机制.方法:实验大鼠随机分为对照组、过度训练组、谷氨酰胺干预组,过度训练组大鼠进行每周6次,共9周的力竭性运动训练,谷氨酰胺干预组大鼠在大负荷运动之前按1.5 g/kgBW剂量补充谷氨酰胺,9周后,检测各组大鼠小肠slgA、Gln、MDA的含量及SOD活性.结果:1)与对照组比较,过度训练组大鼠小肠sIgA含量显著下降;且小肠SOD活性、Gln含量显著下降,MDA含量显著升高.2)与过度训练组相比,Gln干预组小肠slgA和Gln的含显著升高,虽然SOD活性没有显著性变化,大鼠小肠组织中MDA含量显著降低.结论:1)过度训练导致大鼠肠道体液免疫功能显著下降;过度训练时大鼠肠道Gln水平下降和自由基代谢的增强,可能是过度训练引起肠道免疫功能降低的主要机制.2)补充Gln可改善长期大负荷运动训练大鼠肠道体液免疫功能;而Gln的补充可使大负荷训练大鼠肠道Gln含量升高和氧自由基生成减少,可能是Gln补充防止大负荷训练大鼠肠道体液免疫功能下降的主要机制.     

Interference cancellation technique under imperfect synchronization in cellular systems

In this paper, an asynchronous cooperative cellular system applied with space-time block coding(STBC)is investigated. A signal detector is proposed based on parallel interference cancellation(PIC), to cancel the inter-symbol interference(ISI)caused by the imperfect synchronization. Simulation results show that the proposed PIC detector can effectively suppress the ISI, but there is still a comparatively high error floor, due to the co-channel interference(CCI)of the cellular system.     

Detecting subtle yet fast skeletal muscle contractions with ultrasoft and durable graphene-based cellular materials

Human bodily movements are primarily controlled by the contractions of skeletal muscles. Unlike joint or skeletal movements that are generally performed in the large displacement range, the contractions of the skeletal muscles that underpin these movements are subtle in intensity yet high in frequency. This subtlety of movement makes it a formidable challenge to develop wearable and durable soft materials to electrically monitor such motions with high fidelity for the purpose of, for example, muscle/neuromuscular disease diagnosis. Here we report that an intrinsically fragile ultralow-density graphene-based cellular monolith sandwiched between silicone rubbers can exhibit a highly effective stress and strain transfer mechanism at its interface with the rubber, with a remarkable improvement in stretchability (>100%). In particular, this hybrid also exhibits a highly sensitive, broadband-frequency electrical response (up to 180 Hz) for a wide range of strains. By correlating the mechanical signal of muscle movements obtained from this hybrid material with electromyography, we demonstrate that the strain sensor based on this hybrid material may provide a new, soft and wearable mechanomyography approach for real-time monitoring of complex neuromuscular–skeletal interactions in a broad range of healthcare and human–machine interface applications. This work also provides a new architecture-enabled functional soft material platform for wearable electronics.     

基于灾变机制下元胞遗传算法的精英迁移策略的研究

引入灾变机制的元胞遗传算法并非使种族退化,而是尽快摆脱进化迟钝状态,开始新计算的有效手段。实验证明,在灾难区域范围内采用不同的个体植入方法,即采用不同"精英迁移"策略的元胞遗传算法,用于求解复杂多峰函数优化问题,获得了较好的效果。     

运动锻炼对中老年人免疫功能的影响

适度的运动锻炼对免疫功能具有刺激作用，并延缓因年龄增长所引起的免疫功能衰退