联苯型大环化合物的~1HNMR谱研究

本文报道了联苯型[11]及[17]环系大环化合物1—3的合成，归属了化合物1～3的1HNMR谱图的质子化学位移值，由公式推导的化合物1～3的联苯中苯环质子的化学位移的计算值与其实测值基本一致，但环上亚甲基质子的化学位移值的计算值与实测值有一定的差值，表明大环上N原子所连取代基的吸电子效应强及小环的亚甲基质子的化学位移值大。     

一种脊波域数字水印算法

针对静止的自然图像,提出了一种基于有限脊波变换-Finite Ridgelet Transform(FRIT)域的水印算法．该算法利用二进小波提取原图像的模值图像之后,再对它进行分块,并分别对各个子块进行FRIT,最后把经过扩展谱技术处理得到的水印嵌入到每个子块能量最高的脊波系数中。水印的检测利用了相关函数法,且实现了水印的盲检测。实验证明该算法具有较强的鲁棒性。     

自闭症谱系阅读障碍研究综述

自闭症谱系障碍(ASD)学生的阅读研究在国外已经开展了二、三十年,但在国内还处于起步阶段。随着一批具有学业能力的ASD儿童进入小学,他们的学习能力和特点,尤其阅读的方法和如何提高他们阅读理解能力等问题,引起儿童家长和学校教师更多的关注。本文评介和分析了ASD学生阅读的特征、机制和干预原理,在总结国外相关研究成果的基础上,对如何结合我国语言文字的特点开展自闭症谱系障碍的阅读研究提出了几点建议。     

氮杂冠醚的质谱研究

本文探讨了2,3,4,5--=(1′,2′-苯--9苯基--9--氮杂--1.6--二氧杂环+--2.4--=烯在电子轰击下分子的裂解方式,并推测了一些亚稳态碎片的结构。     

Challenges and Assistive Technology during Typical Routines: Perspectives of Caregivers of Children with Autism Spectrum Disorders and Other Disabilities

ABSTRACT

Children with Autism Spectrum Disorder (ASD) and other developmental disabilities can face challenges during typical daily routines. Assistive technology can be used to address the problems encountered during typical routines, yet the competence of caregivers of children with these disabilities in using assistive technology varies. This study was designed to explore Saudi Arabian caregivers’ perceptions about problematic typical daily routines. Caregivers of children with these disabilities were surveyed about the problems they encountered with typical routines, the solutions they found to the problems, the assistive technology they used in the solutions, and their training in and feelings of competence about using assistive technology. Caregivers experienced problems in playing, bathing, and mealtime routines and some found solutions using assistive technology. Over one-third of the caregivers did not feel at all competent in using assistive technology. Suggestions for future research as well as training and development for caregivers are provided.     

频谱细化技术与功率倒频谱在振动信号分析中的应用

频谱细化技术和功率倒频谱是振动信号分析的两种重要辅助方法.采用细化处理,可以对信号频谱上感兴趣的一段频带进行“局部放大”,从而提高频率分辨率;倒频谱可以识别信号中较弱的周期成分,并对识别调制信号的边频县有特殊的效果.本文在介绍这两种方法基本原理的基础上,运用工程实例说明了其在振动信号分析中的实际应用效果.     

基于Matlab的跳频系统的仿真

跳频系统是一种典型扩展频谱通信系统,它在军事通信、移动通信、计算机无线数据传输和无线局域网等领域有着十分广泛的应用。本文介绍了跳频系统的基本工作过程,并利用Matlab中的Simulink仿真系统实现跳频系统的仿真和分析,达到了预期的效果。     

Spectral city: San Francisco as Pacific Rim city and counter‐cultural contado

Abstract

San Francisco, since its global takeoff in the Gold Rush Days and long‐standing trafficking in Bohemian, socialist, queer, and left‐leaning energies in and beyond the Beat era of the 1960s, has a complicated global/local history of trying to disentangle its city‐space and urban imaginary from the Greco‐Roman will‐to‐supremacy that would turn California into a frontier settlement of Asian/Pacific domination and US‐framed empire. Forces of social becoming like the Beats and post‐Beat hippies as well as more experimental authors like Jack Spicer, Maxine Hong Kingston, Frank Chin, and Bob Kaufman helped to forge a different literary‐social vision of San Francisco and the Pacific Rim city as a porous community of transnational innovation and outer‐national becoming. This paper will invoke some literary and film texts from Howl and Tripmaster Monkey to Vertigo to Margaret Cho stand‐up performances as well as some geopolitical studies, such as Gray Brechin’s Imperial San Francisco and City Light Press’s Reclaiming San Francisco to substantiate this double vision of San Francisco as global/local US site of (a) imperial ratification and (b) counter‐orientalist deformation.     

The AQ scores of school-age children referred to educational psychologists

The Autism Spectrum Quotient (AQ) scale was designed to detect the level and distribution of autistic-like traits across both the general population and those diagnosed with an Autism Spectrum Condition. Scores in the large normative samples were consistent with previous research in showing a continuous distribution of traits, implying that the Autism Spectrum might be viewed as one pole of an endless continuum rather than a distinct categorical condition. The preliminary research reported in this article looked at AQ levels in 75 random referrals to educational psychologists and identified a significantly elevated mean score with a large effect size (d = 1.46). The possible implications for practice and for further research are discussed.     

浅析近红外光度与宽线区光度的关系

研究了69个平谱射电类星体(Flat Spectrum Radio Quasars)的近红外射线光度与宽线区光度之间的关系,发现它们之间存在较强的相关性。在排除了红移的影响后,两者的相关性变的非常微弱。这表明平谱射电类星体的近红外辐射与宽线区辐射可能具有不同的物理辐射机制。还讨论了近红外光度与中心超大质量黑洞质量之间的相关性。