A study of the “heartbeat spectra” for “sleeping beauties”

We first introduced interesting definitions of “heartbeat” and “heartbeat spectrum” for “sleeping beauties”, based on van Raan's variables. Then, we investigated 58,963 papers of Nobel laureates during 1900–2000 and found 758 sleeping beauties. By proposing and using G_s index, an adjustment of Gini coefficient, to measure the inequality of “heartbeat spectrum”, we observed that publications which possess “late heartbeats” (most citations were received in the second half of sleeping period) have higher awakening probability than those have “early heartbeats” (most citations were received in the first half of sleeping period). The awakening probability appears the highest if an article's G_s index exists in the interval [0.2, 0.6).     

引入衰落传输融合拓扑结构的频谱检测设计

频谱检测技术是无线电提高频谱利用率的重要环节,认知无线电在杂波融合条件下频谱感知检测受到杂波阴影衰落的影响,降低频谱检测概率。传统方法采用AD转换网络拓扑结构进行频谱感知,受到动态门限检测的影响,频谱感知检测效果不佳。提出一种基于动态阈值加权能量检测模型的无线电频谱感知检测算法,引入衰落传输融合拓扑结构,设计杂波背景下的信道融合准则,定义信道衰落因子,动态调整各认知用户的检测门限和传输可信度,基于动态阈值和可信度实现协作频谱感知检测,仿真实验证明采用该算法能大幅提高对无线电感知频谱的检测概率,克服传输信道中存在的阴影衰落的影响,检测性能优于传统算法。     

科技期刊中磁共振氢谱图编排实例评析

近年来,磁共振(NMR)技术在有机物分子结构表征中的运用越来越普遍,然而科技期刊中NMR图谱的编排格式尚不统一.列举了6种常见的一维磁共振氢谱(1H NMR)图并加以分析,以期强调科技期刊插图的编排在执行国家标准的基础上应进一步细化要求,并更好地与国际刊物接轨.     

协作认知网络中基于用户密度与感知时间的吞吐量优化

在协作认知网络中,增加协作的认知用户数,可以减少本地感知时间,但同时会增加通知时间,所以在优化感知性能时需要权衡考虑认知用户的数量。在考虑通知时间的情况下建立了协作认知网络吞吐量优化模型,在保护主用户的前提下,联合优化用户密度和感知时间使吞吐量最大。仿真结果表明：用户密度较大时,通知时间限制了吞吐量的提高,选择合适的协作用户数才能使吞吐量最优。     

Differences in the Prevalence,Severity and Symptom Profiles of Depression in Boys and Adolescents with an Autism Spectrum Disorder versus Normally Developing Controls

The prevalence, severity and symptom profiles for major depressive disorder (MDD) were compared in samples of boys and adolescents with and without an autism spectrum disorder (ASD). Self-reports were obtained on the Depression subscale of the Child and Adolescent Symptoms Inventory (CASI-D) with 70 ASD and 50 non-ASD male participants between the ages of 8 and 18 from Queensland, Australia who were matched for age and IQ. Results indicated that the ASD participants had significantly higher total CASI-D scores, a greater proportion of participants who qualified for a diagnosis of MDD, and over 50% higher scores for 8 of the 10 CASI-D symptoms than non-ASD participants. The MDD profiles for the ASD participants were dominated by anhedonia. Issues for assessment and diagnosis of comorbid MDD in young males with an ASD, plus targeted treatment planning that directly addresses their MDD profile, are discussed.     

sEMG feature analysis on forearm muscle fatigue during isometric contractions

In order to detect and assess the muscle fatigue state with the surface electromyography(sEMG) characteristic parameters,this paper carried out a series of isometric contraction experiments to induce the fatigue on the forearm muscles from four subjects,and recorded the sEMG signals of the flexor carpi ulnaris.sEMG's median frequency(MDF) and mean frequency(MF) were extracted by short term Fourier transform(STFT),and the root mean square(RMS) of wavelet coefficients in the frequency band of 5—45 Hz was obtained by continuous wavelet transform(CWT).The results demonstrate that both MDF and MF show downward trends within 1 min; however,RMS shows an upward trend within the same time.The three parameters are closely correlated with absolute values of mean correlation coefficients greater than 0.8.It is suggested that the three parameters above can be used as reliable indicators to evaluate the level of muscle fatigue during isometric contractions.     

软硬件相结合的移动通信原理实验系统设计

针对当前移动通信原理实验课程的教学现状,将基于实验箱的验证性实验和基于SystemView的综合性实验相互结合,设计了一个全方位、多层次的移动通信实验系统。教学实践表明,该实验系统知识覆盖面广,能够激发学生的积极性,取得了较好的实验教学效果。     

“弦振动的研究”实验强化偏微分方程的感性认知

弦振动的研究实验表现出的物理现象与数学物理方程课程的数学论证过程相结合,可以强化学生的感性认知,提高学习兴趣,加深对典型波动方程的建立、边界条件和初始条件的设定、解的求解过程的深刻理解.     

（H3O）2［Co（C2N2H8）3］2［W7O24］结构和振动光谱的实验和理论研究

采用水热法合成了新化合物（ H3O）2[ Co（ C 2N 2H 8）3]2[ W 7O 24],对其结构进行了红外光谱和X射线单晶衍射测定。通过密度泛函理论,对其红外光谱进行了计算,对吸收峰的振动模式进行了指认。结果显示,（H3O ）2[Co （C2N2H8）3]2[W7O24]的红外光谱对溶剂十分敏感。     

HPS澄清池结构形式的优化分析

以＂蒲城清洁能源化工有限责任公司渭北煤化工园区厂外供水净化工程＂项目中的＂HPS澄清池＂的结构形式优化为背景,采用有限元分析软件MIDAS/Gen分别建立原方案和优化后方案HPS澄清池的结构模型,结合澄清池特殊的工艺要求和其结构所受荷载情况,分析比较两种模型静力和动力特征,总结在静力、动力作用下结构的受力特性、应力和变形的分布规律,为该工程结构计算与设计提供依据。