AMTI雷达平台运动补偿

AMTI 雷达中,由于平台运动,地面固定杂波平均多普勒频率平移及杂波谱展宽,造成两相邻脉冲回波间产生一相位超前。本文对这种平台运动效应进行了分析,提出了一种采用自适应方法产生校正信号,对回波平台运动效应进行了补偿。这种补偿不局限于每次两个脉冲之间,而可适用于多个脉冲,从而为 MTI 处理提供了方便。还获得了有、无补偿的一次对消处理结果。     

原子吸收光谱法测定污水中钙、镁

主要研究了污水中钙镁含量的原子吸收光谱分析法、影响因素和操作条件的控制.     

Using Transfer Procedures to Teach Tacts to a Child with Autism

This applied study attempted to evaluate a combination of transfer procedures commonly used to teach tacts to children with autism. A receptive to echoic to tact transfer and an echoic to tact transfer procedure were combined during 5-min instructional sessions to teach tacts to a seven-year-old vocal child with autism. A multiple baseline design across three sets of ten tacts was used. Without the teaching procedure, the child acquired no target tacts. With the 5-min teaching procedure implemented first with Set 1 then with Sets 2 and 3, respectively, the child acquired thirty new tacts over sixty teaching sessions. The results have wide application for children with and without autism who need instruction to learn tacts.     

蛋白质谱数据的特征提取

变性蛋白质与正常对照组的蛋白质的HPLC-MS谱图存在人工无法发现的差异性,也是本文所说的特征,本文的研究工作就是通过信息学的方法寻找这些特征。实际工作中,我们先从谱图中提取数据,重新采样,并且对采样数据进行基线校正,归一化,噪声降解,得到预处理好的数据集。然后利用遗传算法来最优化结果,找到了变性蛋白质的特征谱线。我们期望根据这些特征建立未知蛋白质的分类模型,为疾病的诊断提供依据。     

Clinical gait and stepping performance measures in older adults

Problems with ambulation and mobility are frequent problems in older adults. Each year, about one in 100 older adults develops new severe mobility disability. Assessment of abnormal gait constitutes a major component of clinical practice and may lead to fall reduction. Clinicians can benefit from simple gait and mobility assessment tools to be used in busy clinical settings. This review focuses on gait and stepping performance measures that can be used by the busy clinician to assess gait, mobility performance, balance, and falls risk in the older adult.     

Musculoskeletal discomfort and work-related stress in New Zealand dentists

There has been little research into the stressors, psychological distress and musculoskeletal symptoms experienced by dentists. The present study was carried out among a random sample of New Zealand dentists (N=413). The present study aimed to identify the severity of work psychosocial stressors, examine the occurrence of musculoskeletal discomfort and psychological disturbance, and determine relationships between these factors. The average age of the dentists was 43 years, with 74% being male. The annual prevalence of symptoms in both the lower back or neck was 63%, with 49% experiencing symptoms in the shoulders. Older dentists were no more likely to suffer musculoskeletal discomfort than younger dentists. The highest ranking dentistry-specific work-related stressor was 'patients having a medical emergency' with 78% scoring this stressor very highly. Dentists scored mental demands as the highest general work-related stressor. One-fifth of the dentists scored highly for psychological disturbance, which was very similar to the general population. Dentists with high scores for dentistry-specific work-related stressors were more likely to have evidence of psychological disturbance. The relationships between psychological disturbance and musculoskeletal discomfort needs to be taken into account when considering any multidisciplinary approach to prevention.     

评“主体间性美学”——兼答杨春时先生

把后实践美学命名为“主体间性美学”而把实践美学称为“主体性美学”,并且把前者作为对后者的超越,这种做法是一种急功近利的炒作行为,并不是历史的必然。首先,它是历史叙事的错位,把与时俱进的实践美学定格在近代启蒙主义的“主体性美学”范畴,却把后实践美学强行规定为现代的“主体间性美学”,歪曲了中国美学的现代转型的历史;其次,它是哲学观念的扭曲,把“主体间性”任意扩展到一切领域,使整个世界的一切存在物都成为了“主体”,实际上就没有了主体,更谈不上“主体间性”,结果只能是造成人类思想的一片混乱;再次,它是美学理论的倒退,在把一切都主体化的混乱之中,用“主体间性”使一切旧的唯心主义的美学概念都合法化起来,以凑合成所谓的“后实践美学”的“主体间性美学”。     

反氢原子能级及光谱的经典定性研究

利用一种带相位因子的经典屏蔽Coulomb势,采用经典分析方法对反氢原子的能级和光谱给出了预言性的描述,结果发现其能级与光谱同氢原子有较大区别。在反氢原子中主量子数n小于1的分数值且正电子由基态跃迁到激发态时才产生光谱,与氢原子发光机制正好相反。     

蓝宝石微带色散特性研究

本文将谱域导纳法推广应用于各向异性介质基片微带,通过详细的理论分析,导出了各向异性等效传输线的特性导纳公式,并考虑了导带厚度的影响,建立了各向异性介质基片平面传输线传播常数色散特性的计算机程序。用本文推导的结果进行数值计算,在2-18GHz内求得的蓝宝石微带色散曲线与文献[1]的结果吻合得很好。此外,本方法直接、简明、且计算量小、适用于各类微波平面传输线的分析。因而,其具有较大的工程实用价值。     

硫酸根离子配位方式的群论研究

本文用群论的方法，通过分子对称性的分析，讨论了硫酸根离子ＳＯ２－４在配合物中的配位方式，并与实验事实进行了比较，得到了满意的结果。