Policies for biodefense revisited: The prioritized vaccination process for smallpox

Handling bioterror events that involve contagious agents is a major concern for authorities and a cause for debate among policymakers about the best response policy. At the core of this debate stands the question which of the two post-event policies to adopt: mass vaccination or trace (also called ring or targeted) vaccination. We present a new dynamic epidemic-intervention model that captures key features of the situation and generalizes some previous assumptions regarding the probability distributions of inter-temporal parameters. It is shown that a mixture of mass and trace vaccination policies—the prioritized vaccination policy—is more effective than either of the two aforementioned policies.     

关于均值KIRCHHOFF板非线性边界镇定问题的几点注记

对于均值K IRCHHOFF板非线性边界镇定问题给出几点注记.首先应用G reen公式对具有非线性边界反馈控制的均值K IRCHHOFF板所决定的非线性系统的能量衰减速度进行了重新推导,从而修正了前人的结果.然后应用极大单调函数的定义和分部积分技巧,对均值K IRCHHOFF板非线性边界镇定问题所决定的非线性算子A的极大单调性给出了重新证明,进而更正了已有文献中相应证明的欠妥之处.     

微量元素制剂辅助治疗复发性口疮疗效观察

报道了１０３例ＲＡＵ患者使用微量元素制剂辅助治疗的临床疗效观察。将两个实验组分别与对照组比较。结果显示：应用锌、铁制剂辅助雷公藤、复方丹参等治疗的实验组Ｉ效果优于雷公藤、复方丹参对照组（Ｐ〈０．０１），而仅用锌、铁制剂治疗的实验组Ⅱ临床效果比对照组差（Ｐ〈０．０１），但锌、铁制剂有改善ＲＡＵ临床症状作用，而不能较好地控制其复发。     

高纯金属镨中痕量稀土杂质的电感耦合等离子体原子发射光谱分析及光谱干扰的校正

本文提出了PGS-2型平面光栅光谱仪(色散率0.18纳米,二级光谱)与PlasmaTherm ICP-5000D射频发生器联用,乙醇预去溶方式进样,同时直接测定高纯金属镨中5个痕量稀土杂质元素的方法。并讨论了基体浓度对检出限的影响以及光谱干扰及其校正方法。当样品溶液中镨的浓度为5毫克/毫升时,测定下限分别为镧、钕和钐0.002%,铈0.003%和钇0.0005%。获得了良好的实验结果,其相对标准偏差为1.2-6.2%。     

Relationships between characteristics in periodic Poisson queues

We study single server periodic queues in the day equilibrium conditions. The following characteristics of interest are considered at time of dayt: V^p(t)-the work load, L^p(t)-the number of customers and u^p(t)-the departure rate. We give relationships between E[V^p(t)], E[L^p(t)] and u^p(t). We also prove that E[V^p(t)] < and E[L^p(t)] < provided the second moment of the service time is finite.     

Representing workloads in GI/G/1 queues through the preemptive-resume LIFO queue discipline

We give in this paper a detailed sample-average analysis of GI/G/1 queues with the preemptive-resume LIFO (last-in-first-out) queue discipline: we study the long-run state behavior of the system by averaging over arrival epochs, departure epochs, as well as time, and obtain relations that express the resulting averages in terms of basic characteristics within busy cycles. These relations, together with the fact that the preemptive-resume LIFO queue discipline is work-conserving, imply new representations for both actual and virtual delays in standard GI/G/1 queues with the FIFO (first-in-first-out) queue discipline. The arguments by which our results are obtained unveil the underlying structural explanations for many classical and somewhat mysterious results relating to queue lengths and/or delays in standard GI/G/1 queues, including the well-known Bene's formula for the delay distribution in M/G/l. We also discuss how to extend our results to settings more general than GI/G/1.     

食管贲门癌患者血清微量元素的变化

检测了３０例食管贲门癌患者手术羊后的ＳＣｕ，ＳＺｎ及Ｃｕ／Ｚｎ比值，并以２８例健康查体者作对照研究，发现：（１）食管贲门癌患者术前血清ＳＣｕ及Ｃｕ／Ｚｎ值高于对照，ＳＺｎ低于对照；（２）肿瘤患者术后１０天血清ＳＣｕ及Ｃｕ／Ｚｎ值下降，ＳＺｎ接近正常，通过本文研究提示，血清ＳＣｕ，ＳＺｎ及Ｃｕ／Ｚｎ比值与食管贲门癌患者的病情和疗效有关，可作为监测和判断病情和预后的辅助检查。     

微量元素与精神病的研究

一些基础医学实验研究和临床观察的资料表明，精神疾病患者体内的微量元素存在着显著的异常，已引起了国内外学者广泛关注，本文根据近年来的国内外文献报道，概述了微量元素锌（Ｚｎ），铜（Ｃｕ），铁（Ｆｅ）和常量元素钙（Ｃａ），镁（Ｍｇ）的生理作用及与精神病关系的研究进展。     

环境微量元素与大骨节病

通过对两个自然村的大骨节病的流行病学调查结果表明，患病率在１７．２％，从Ｘ线检查病变部位都在干骺端，说明致病因素的持续作用仍在发展中，所采水样中微量元素低于国家饮水标准，在今后疾病的防治中，应根据营养条件，生态环境，元素比例，农作物的病害，制作相关的防治措施。