Synchronization of the acoustic evidence in the assassination of President Kennedy

We have revisited the acoustic evidence in the Kennedy assassination--recordings of the two Dallas police radio channels upon which our original NRC report (Ramsey NF et al., Report of the Committee on Ballistic Acoustics. National Research Council (US). Washington: National Academy Press, 1982. Posted at http://www.nap.edu/catalog/10264.html) was based--in response to the assertion by DB Thomas (Echo correlation analysis and the acoustic evidence in the Kennedy assassination revisited. Science and Justice 2001; 41: 21-32) that alleged gunshot sounds (on Channel 1), apparently recorded from a motorcycle officer's stuck-open microphone, occur at the exact time of the assassination (as established by emergency communications on Channel 2). We have critically reviewed these two publications, and have performed additional analyses. In particular we have used recorded 60 Hz hum and correlation methods to obtain accurate speed calibrations for recordings made on both channels, cepstral analysis to seek instances of repeated segments during playback of Channel 2 (which could result from groove jumping), and spectrographic and correlation methods to analyze instances of putative crosstalk used to synchronize the two channels. This paper identifies serious errors in the Thomas paper and corrects errors in the NRC report. We reaffirm the earlier conclusion of the NRC report that the alleged "shot" sounds were recorded approximately one minute after the assassination.     

让警察远离亚健康的困扰--论警察健康权益的维护和救济

由于过度劳累、工作环境恶劣、生活没有规律等原因,我国大部分警察处于亚健康状态.让警察远离亚健康的困扰,既是维持警察个体正常生命活动的需要,也是维护国家安全、社会稳定、人民生命财产安全的需要.对警察的健康权益进行维护和救济,必须在优化现有警力资源的同时逐年增加公安干警编制;必须提升民警素质、实现"数字公安",走科技强警之路;必须建立大练兵长效机制,增强民警的身体素质和业务技能,提高队伍的战斗力;必须采取各种措施从优待警.     

The Impact of School Mental Health Services on Out-of-School Suspension Rates

The current study investigated whether the presence of school-based mental health clinicians in an urban school district was associated with reduced out-of-school suspension rates. Forty one elementary schools with expanded school mental health (ESMH) programs were compared to 41 schools without ESMH programs. Correlational analyses revealed associations between suspension outcomes and several school-level demographic variables including school attendance rate, percent of students in poverty, and percent of nonwhite students in the school. After controlling for these variables, however, results of stepwise linear regressions demonstrated no significant differences between ESMH and non-ESMH schools on suspension outcomes. Results of the current study suggest that the presence of ESMH clinicians will not necessarily impact suspension rates in an elementary school. Targeted and well-implemented approaches to address behaviors that lead to suspension, or school- and system-level policies to provide alternatives to suspensions, will likely be a better route to achieving this outcome.     

Reconsidering The Counter-Mobilization Hypothesis: Health Policy Lobbying In The American States

Despite its widespread use since the concept was introduced by David Truman (1951. The Governmental Process. New York: Alfred A. Knopf), counter-mobilization by organized interests has remained theoretically ambiguous and rarely studied empirically. We more fully develop the concept of short-term counter-mobilization, distinguish it from long-term counter-mobilization, specify the conditions under which we might observe short-term counter-mobilization, and test the resulting hypotheses with data on health care lobby registrations in the American states during the late 1990s. We find little evidence of short-term counter-mobilization among health interest organizations, which leads us to more fully consider several null hypotheses about the limits of strategic behavior on the part of organized interests.An earlier version of this paper was prepared for presentation at the Annual Meeting of the Midwest Political Science Association, Chicago, April 2004. This research was supported by a Robert Wood Johnson Foundation Investigator Award in Health Policy Research (ID#047727).     

掌握学生个性心理，做好思想教育工作

在市场经济的新形势下 ,做好公安院校学生的思想工作 ,不能只是用原来的硬性思想教育方式 ,而是要将硬性思想教育与柔性思想教育相举并用。柔性思想教育抓住当前社会上存在的价值意识特征 ,考虑学生的个性心理特点和切身利益需要 ,引导学生认识自身的心理特点 ,发挥长处 ,克服缺点 ,结合硬性思想教育 ,培养学生具有健康的心理 ,树立正确的价值观 ,以达到思想教育的目的。     

死亡方式对大鼠DNA降解影响的图像分析研究

探讨不同的死亡方式对组织细胞核 DNA 降解的速率是否存在影响。选取20只大鼠随机分为4组,分别采用失血性休克、断颈、溺死及扼死等4种方式处死,每2 h 取材一次(脑、脾、肝组织),Carnoy 液固定,VANS 改良法染色,选取7个指标进行图像分析,数据经一元回归及多元回归统计处理,对不同死亡方式组的一元回归方程进行多组间分析。结果显示,7个指标与死亡时间明显相关,但在不同死亡方式组间各指标相关性存在差异,一元回归方程比较显示,溺死组与其他组肝组织 ID、AOD、LDC 3个指标存在差异,显示其 DNA 降解较慢,脾脏在溺死组 A、MD、ID、AOD、LDC、AG 等6个指标以及失血性休克组 MD、ID、AOD、AG 等4个指标与其他组间存在明显差异,而脑组织在不同组间则差异较小。多元回归分析进一步印证了上述差异。在失血性休克、溺死、断颈及扼死致死的尸体间其组织细胞 DNA 降解速率存在差异,其原因可能与淤血程度及尸体所处环境有关。在本实验条件下,脑是受影响最小的器官,而脾是较易受影响的器官。     

中国汉族女性腰椎的身高推断

测量中国汉族女性腰椎,建立腰椎推断身高的方法。按人体骨骼测量方法,对第一至第五腰椎的10项指标进行测量,并将各腰椎的测量数据与身高进行相关分析,建立中国汉族女性腰椎推断身高的回归方程。获得的推断身高的5个回归方程,其相关系数(r)和标准差(s)分别为 r_1=0.751,s=45.0171;r_2=0.698,s=48.2804;r_3=0.758,s=43.3508;r_4=0.497,s=56.0890;r_5=0.606,s=53.3158。本研究建立的方法误差小,可以用于中国汉族女性腰椎的身高推断。     

用熔解曲线法分析插入/缺失多态性和Y染色体SNPs多态性

随着单核苷酸多态性SNPs (SingleNucleotidePolymorphisms)及插入 /缺失多态性Indels (Insertion/Dele tion)的分型技术研究的深入 ,SNPs和Indels在法医学上的应用将受到深刻的影响。本文研究和探讨Indels的分型方法 ,通过测定扩增DNA片段在溶液中的溶解曲线图确定每个样品的基因型 ,称为溶解曲线Indels基因分型方法(McI/D)。溶解曲线图由被测样品DNA片段的特殊溶解温度组成 ,扩增结果直接由仪器分析不需要繁杂的PCR后期操作。     

掌骨骨折损伤程度及法医学鉴定

探讨掌骨骨折的致伤特点及活体损伤程度的法医学鉴定。对 5 2例掌骨骨折的案例资料按不同掌骨及损伤类型进行分析。第 1～ 5掌骨分别对于掌骨头、掌骨颈、掌骨干、掌骨基底部的骨折发生率和致伤机理各有不同 ,直接暴力所致第 2掌骨头、间接暴力所致第 5掌骨颈、第 3和 4掌骨干及第 1掌骨基底部等部位的骨折最常见。分析结果表明 ,掌骨骨折损伤程度不同 ,其损伤机理不同 ,各有其特点