Convey certain national forest system lands [microform] : hearing before the Subcommittee on Forests, Family Farms, and Energy of the Committee on Agriculture, House of Representatives, Ninety-seventh Congress, first session, on H.R. 3021 and H.R. 3898, June 22, 1981.

"Serial no. 97-RR."

分子法激光分离同位素中的物理化学气体动力学研究

<正> 尽管激光分离同位素(LIS)才出现十几年,但由于其突出优点,受到世界各国的重视,发展极快。其中有大量课题与力学紧密相关,但迄未见到从这两个乍看起来关系不大的学术领域的结合上作出的总结和评述。本文希望填补这一空白。 1.激光同位素分离 从天然矿物或人工产物中将对人类用处较大的同位素分离出来,对于国民经济和军事应用十分重要。例如,天然矿物中铀235的含量只有约0.7％;而世界

Toward a measure of social-ecological resilience for human communities

The purpose of this essay is to clarify the theoretical understanding of the concept of resilience in order to explore problems surrounding the empirical measurement and application of the concept, as well as to examine strategic examples of empirical measures and policy applications in the literature of several disciplines, fields, and professions. The examination of resilience occurs in two streams: one conceptual and one methodological. At the conceptual level, the focus will be on definitions, distinctions between resilience and related concepts, and the theoretical frameworks that underlie usage of the concept. At the empirical level, the examination of resilience will be centered on the methodological challenges associated with research on resilience as well as previous attempts to operationalize and measure resilience. (PDF contains 4 pages)

Resistência de três materiais retrobturadores frente à infiltração microbiana por Enterococcus faecalis

O objetivo deste estudo foi comparar a capacidade de selamento apical de três materiais retrobturadores em dentes submetidos à infiltração microbiana por Enterococcus faecalis. Além de analisar a ocorrência da infiltração microbiana em relação à variável tempo. Para tal, foram utilizados 45 incisivos superiores permanentes humanos extraídos, instrumentados com o sistema rotatório ProTaper Universal (MAILLEFER) e obturados pela técnica Híbrida de Tagger, com cimento endodôntico: AH Plus (DENTSPLY). A apicetomia foi realizada com a remoção de 3mm do terço apical e o retropreparo confeccionado com pontas ultrasônicas. As amostras foram subdivididas, aleatoriamente, em três grupos com 15 dentes cada, e dois grupos controles. Os materiais utilizados para a retrobturação foram MTA branco (ANGELUS), Sealer 26 (Dentsply), Palacos-R (HERAEUS KULZER). Foram confeccionados dispositivos para fixação dos dentes aos tubos Eppendorfs. As amostras foram inoculadas com cepas de E. faecalis e incubadas a 37C, por um período de 60 dias, para análise da presença de turvação do meio Enterococosel. Para a realização da análise estatística foram utilizados os seguintes testes: Quiquadrado pela correção de Yates, Prova Exata de Fisher e pela curva de sobrevivência com os testes Mantel-Cox e o Gehan-Breslow-Wilcoxon. Os resultados mostraram que todos os grupos nos quais foi realizada a obturação e a posterior retrobturação apresentaram infiltração. Comparando todos os grupos, houve diferença significativa entre o Palacos-R e o Sealer 26. Mas não houve diferença significativa entre o Palacos-R e o MTA e nem do MTA com o Sealer 26. Em relação aos materiais retrobturadores, o Palacos-R obteve a menor infiltração, seguido do MTA branco e do Sealer 26.

七株微囊藻系统进化关系的RAPD-PCR分析

应用RAPD-PCR的方法,选用24个随机引物,分析来自不同地区的7株微囊藻的基因组多态性。结果显示,Microcystis.viridis及M.wesenbergii明显与M.aeruginosa区分开。M.aeruginosa分为两个可视为不同种的异源分类单位。作为对照的Anabaena sp.7120与其他微囊藻株表现出完全不同的基因型及更远的遗传距离。 此项研究表明,以基因型而不是表现型为基础,分析蓝藻种内及种间区别是可能的。因此,为解决蓝藻分类问题,特别是在种和属的水平上,提供了重要的线索。结合

支持外包的软件协同工作模型

中国计算机学会

两个子带占据的In_(0.53)Ga_(0.47)As/In_(0.52)Al_(0.48)As量子阱中填充因子的变化规律

研究了低温(1.5K)和强磁场(0-13T)条件下,InP基In_(0.53)Ga_(0.47)As/In_(0.52)A_(l0.48)As量子阱中电子占据两个子带时填充因子随磁场的变化规律.结果表明,在电子自旋分裂能远小于朗道能级展宽的情况下,如果两个子带分裂能是朗道分裂能的整数倍时,即⊿E_(21)=κ*ω_c(其中κ为整数),填充因子为偶数;当两个子带分裂能为朗道分裂能的半奇数倍时,即⊿E_(21)=(2κ+1*ω/2,填充因子出现奇数.

绿色供应链管理动力转换模型实证研究

基于系统观思想,提出外部动力和内部资源对绿色供应链管理实践影响的概念模型。以制度理论为基础,开发强制性压力、正规化动力和竞争力题项;以资源基础观为基础,开发有形资源、无形资源和能力的题项。通过对289份企业问卷的分析,勾画动力、能力转换为绿色供应链管理的框架模型。研究结果显示:有形资源、无形资源和能力对绿色供应链管理外部动力转化为实践有调解影响,但对不同压力调解影响的方向和程度各不相同。

岩庄陨石的微矿物学及冲击效应

为了探讨冲击波作用下岩庄陨石的冲击效应，我们利用微矿物学的技术和方法，包括扫描电子显微镜，透射电子显微镜、电子探针、激光拉曼探针、普通光学显微镜、相差显微镜、X射线衍射分析和中子活化分析等，重点对陨石中的矿物（相）微结构、表面微形貌和化学成分特征等作了深入的研究。首次在陨石中找到了天然的橄榄石和辉石击变玻璃。研究发现，强烈的冲击波作用可导致辉石及其高压相发生结构变异和结构重组织，形成以重结晶结构为主，兼具有孤立硅氧四面体，三桥氧和全桥氧硅氧四面体基因混合组合的复杂变异结构。首次在冲击熔融脉体的固化重结晶FeNi金属粒中发现了一种呈非对称性及方向性分布的三带微结构和Ni含量呈“台阶”状分布的模式，研究发现了一种与冲击作用有关的钠猛铁磷矿物（Fe 55.94±0.8wt%，Mn 4.47±0.9wt%，Na 7.48±1.0wt%，P 28.6±0.5wt%），它是原球粒陨石中的磷矿物被冲击熔融和发生分解后，磷与熔体中Na，Mn，Fe等原子结合而成的新矿物相。基于岩石和矿物的冲击效应研究，我们认为岩庄陨石是迄今世界上收集到的经受了最强烈冲击变质作用的普通球粒陨石。

Bereavement: A D.I.S.C. analysis

Theories of bereavement abound. The endeavour to understand this complex process has moved from intra-psychic explanations and stage theories to cognitive rationalizations and, most recently, process orientated explorations of bereavement. What has been missing in most of the literature to date is a detailed analysis of the context within which bereavement behaviours occur. This paper outlines a contingency analysis that includes consideration for the context of Death itself, Individual factors of the bereaved, Social factors, and influences of Cultural norms and systems (D.I.S.C.). The paper concludes by proposing that a comprehensive D.I.S.C. analysis might lead to whole person evidence-based practice in helping those who are experiencing bereavement.