卡尔曼滤波在光纤监测中的应用

薛毅，杨中华．卡尔曼滤波在光纤监测中的应用．本文提出用卡尔曼滤波方法对光纤的接口位置进行确定。该方法的优点是：可以自动地、较为准确地得到光纤的接口位置，为光纤监测数据的自动分析提供了依据     

浅议计量管理在医院日常工作中的重要性

现代科学技术发展日新月异，高科技仪器广泛应用于医疗诊治领域，如何保证医用计量器具的计量单位统一和量值的准确可靠，保障医用计量仪器设备的正常运转，确保医疗诊断、治疗和医学研究的正确性、准确性。本文从医院计量管理方面阐述，计量检定是医院医疗的技术保证．计量管理在医院日常工作中的重要性。     

Estimating the half-life of 241Pu and its uncertainty

Measuring the double isotope atomic abundance ratio as function of time of a homogenized stock of plutonium using mass spectroscopy provides a means to estimate the half-life of ²⁴¹Pu, denoted here as t_1/2,241. After a logarithmic transformation, estimating t_1/2,241 along with a justifiable associated uncertainty is reduced to the analysis of a linear relationship, as illustrated in this paper using 15 published data pairs (time, log(double isotope ratio)) of Wellum et al. (2009) that span approximately 31 years (greater than two half-lives). However, as noted by Wellum et al. (2009), the published 15 data pairs exhibit inconsistencies that indicate possible underestimation of individual experimental uncertainties. Similar inconsistencies often arise in multi-experiment comparisons of the same estimated quantity, typically because some components of uncertainty such as individual experimental biases are difficult to identify and assess. It is therefore an important and common problem. In such cases the experimental data must be supplemented with other information to make plausible uncertainty estimates. We therefore analyze the data pairs under several different assumptions regarding total experimental uncertainties and show quantitatively that the best estimate of t_1/2,241 and of its uncertainty depend on the assumptions regarding experimental uncertainties. It is unlikely in this context that the 15 data pairs and associated estimated experimental uncertainties could guide one toward a very certain choice among the reasonable sets of assumptions regarding total experimental uncertainties. Thus a definitive recommendation cannot be singled out. Fortunately, the best estimates and associated uncertainties arising from different yet tenable assumptions regarding experimental uncertainties are all in reasonably close agreement. And, one of those best estimates we provide (with approximately 95% confidence limits) is (14.329 ± 0.006[fit] ± 0.029[bias]) years, which uses similar data stratification arguments as in Wellum et al. (2009) but a completely different approach. Furthermore, this estimate of t_1/2,241 agrees closely with the value recommended in Wellum et al. (2009) of (14.325 ± 0.024) years. We conclude that the value of t_1/2,241 supported by the available data is robust, despite evidence of some non-ideal behavior, and that alternative means of estimating t_1/2,241 and its uncertainty yield reasonably similar results.     

周期测量仪和重力加速度的测量

本文简述了周期测量仪的设计思想、电路原理、及在单摆实验中提高重力加速度的测量精度的方法，给出了一组重力加速度值的测量数据。     

检测系统的冗余设计

本文中讨论了提高检测系统可靠性的简单、实用、经济的冗余设计方法,主要包括硬件冗余设计和软件冗余设计两个部分,最后举出了应用实列来说明检测系统的冗余设计方法。     

多服务环境下的资源分配策略研究

讨论了基于网络资源检测的动态带宽分配策略,在对网络资源进行动态监测的基础上,对各种服务对资源的占用情况进行在线统计.然后,根据统计分析的结果调整资源分配策略.所提出的方法能在对传统的服务提供一定保证的前提下,开展资源预留服务,使网络资源得到充分利用.用提出的动态带宽分配算法,在NS2环境下进行了仿真.仿真结果表明:该分配方法提高了网络资源利用率,降低丢包率.可提高GP类服务的服务质量,并对BE类服务中的贪婪流具有一定的抑制作用.     

健康大学生24小时动态血压正常参照值的研究

对５６例正常血压者２４小时动态血压测定（ＡＢＰＭ）研究发现,２４小时血压平均值;６．４／９．８ｋＰａ;白天血压平均值;１６．６／１０．２ｋＰａ夜间血压平均值：１５．８／９．１ｋＰａ。男女之间比较,ＡＢＰＭ各项参数值差异均无显著性（Ｐ〉０．０５）,短期内偶测血压（３次平均值）〈ＡＢＰＭ平均血压者４８例,以上结果为ＡＢＰＭ的临床应用提供了重要依据。     

用探针法测定材料的导热系数

根据线热源理论，设计制作了用于测定材料导热系数的探针，研究了接触热阻、加热功率和加热时间对测定导热系数的影响。用探针测定了松散材料、保温材料、土壤和地下岩心的导热系数，实验研究表明。探针法测导热系数具有快速、简便的特点，是测定土壤和保温材料导热系数的有效方法。     

高Tc超导材料R—T曲线的交流动态测量

本文描述了用锁相放大器及交流双回路四端法来测量Y·Ba·Cu·O型高T_c超导材料的电阻—温度(R—T)曲线的细节,获得了满意的结果。     

Implementation of proficiency testing schemes for a limited number of participants

A metrological background for the selection and use of proficiency testing (PT) schemes for a limited number N of laboratories-participants (less than 20–30) is discussed. The following basic scenarios are taken into account: (1) adequate matrix certified reference materials (CRM) or in-house reference materials (IHRM) with traceable property values are available for PT use as test items; (2) no appropriate matrix CRM is available, but a CRM or IHRM with traceable property values can be applied as a spike or similar; (3) only an IHRM with limited traceability is available. The discussion also considers the effect of a limited population of PT participants N _p on statistical assessment of the PT results for a given sample of N responses from this population. When N _p is finite and the sample fraction N/N _p is not negligible, a correction to the statistical parameters may be necessary. Scores suitable for laboratory performance assessment in such PT schemes are compared. Presented at the 3rd International Conference on Metrology, November 2006, Tel Aviv, Israel.