四川汉源县水井湾皇木采办遗迹考

通过对四川省汉源县皇木镇水井湾遗址的考察和发掘,首次发掘出了明代皇木采办所留圆木遗物,推测认为发掘的圆木或是明末皇木采办遗留的不合式的残木,或为运送皇木的滑槽遗木,进而证明了明清之际叶氏家族在汉源县皇木镇采办皇木的历史事实,同时也复原了当时大渡河沿岸山地的植被景观,对环境考古研究有重要的参考价值。     

生物酶对跨湖桥遗址丝状真菌抑菌作用的研究

确定萧山跨湖桥遗址空气、土壤、字幕墙和独木舟侵蚀丝状真菌的种类,探讨生物酶对侵蚀丝状真菌的有效抑菌浓度,为消除生物危害提供参考依据。采用经典方法对侵蚀丝状真菌进行分离、鉴定,并对生物酶的有效抑菌浓度进行研究。空气中主要的丝状真菌有:黑曲霉(Aspergillus niger)、土曲霉(Aspergillus terreus)、展青霉(Penicillium patulum)和圆弧青霉(Penicillium cyclopium)。土壤中主导菌为黑曲霉(Aspergillus niger)、土曲霉(Aspergillus terreus)、聚多曲霉(Aspergillus sydowii)、杂色曲霉(Aspergillus versicolor)、圆弧青霉(Penicillium cyclopium)、展青霉(Penicillium patulum)、黑青霉(Penicillium nigricans)、宛氏拟青霉(Paecilomyces varioti)和枝孢霉(Cladosporium)。字幕墙侵染菌为杂色曲霉(Aspergillus versicolor)。独木舟侵蚀菌为宛氏拟青霉(Paecilomyces varioti)。不同的丝状真菌对生物酶的感应性/耐受性有很大不同。单一的几丁质酶对丝状真菌的生长发育有抑制作用,但几丁质酶和葡聚糖酶的复合协同作用更能有效地抑制丝状真菌的生长发育。     

司馬遷生年新證

關於司馬遷的生年問題,歷來爭議頗多。目前主要集中爲兩說,即漢景帝中元五年(前145)和漢武帝建元六年(前135)。經對有關文獻記載仔細研讀、分析,以及邏輯推理,可認定司馬遷出生的時間在其父司馬談掌"天官"之職以後。由此,進一步確證司馬遷出生於漢武帝"建元六年(前135)"是正確的,而認爲司馬遷出生於漢景帝"中元五年(前145)"則是失察的。     

Modification of Ductility Reduction Factor for Strength Eccentric Structures Subjected to Pulse-Like Ground Motions

This article investigates the ductility reduction factors for RC eccentric frame structures subjected to pulse-like ground motions. The structural models are with the strength eccentricities which are much disadvantageous than the stiffness eccentricities during the inelastic response range. A method to determine the ductility reduction factors of the strength eccentric structures is suggested by modifying those of reference symmetric structures through an eccentricity modification factor. The four factors of strength eccentricity ratio, ductility ratio, story number and velocity pulse of ground motions, are investigated to gain insight into this modification factor. It shows that the ductility reduction factors of the eccentric structures are clearly smaller than those of the symmetric structures. The eccentricity modification factor is mainly affected by the strength eccentricity and the ductility ratio, decreasing with the increment of the eccentricity or the decrement of the ductility ratio in a medium eccentricity range. The earthquake pulse-like effect and the eccentricity have coupling influence on the modification factor, while the effect of story number is not apparent. Based on the results of a comprehensive statistical study a simplified expression is suggested, which can estimate the eccentricity modification factors for both pulse-like and nonpulse-like ground motion cases.     

骆驼墩文化遗存与太湖西部史前文化(下)

2011年10月28～30日",骆驼墩文化论坛——骆驼墩文化遗存与太湖西部史前文化"学术研讨会在宜兴召开。会议围绕"骆驼墩文化命名"问题展开讨论,对骆驼墩遗址的发现,骆驼墩文化遗存的性质及内涵、学术意义、价值定位、文化交流、保护利用进行了界定,提出建议;并就考古学文化的命名、划分及其标准,考古学文化的谱系研究,考古学文化研究的方法和途径等问题进行了研讨。     

重组乳酸乳球菌表达禽流感病毒HA1基因载体的构建及在禽流感病毒防治领域的应用

目的 构建以重组乳酸乳球菌为基础的黏膜输送载体.方法 以高致病性禽流感病毒H5N1的HA1基因作为研究对象,利用nisin诱导表达控制系统,构建分泌型与非分泌型重组乳酸乳球菌表达载体,经口服灌胃途径免疫BALB/c小鼠,通过ELISA检测小鼠血清IgG和粪便IgA,最后,对免疫后的小鼠进行H5N1病毒攻击实验,进而比较分泌型与非分泌型重组乳酸乳球菌表达载体的免疫效率.结果 分泌型重组乳酸乳球菌免疫小鼠后产生的抗体水平(IgG和IgA)高于非分泌型重组乳酸乳球菌,经过同型H5N1病毒攻击后,分泌型重组乳酸乳球菌免疫的小鼠的存活率为80%,而非分泌型重组乳酸乳球菌免疫的小鼠的存活率为60%.结论 本研究为防治高致病性禽流感病毒提供可行的思路与方法.     

铁路与近代安徽旅游业的兴起

随着津浦铁路安徽段、江南铁路、淮南铁路的相继建成通车,铁路成为了联系安徽与东南大都市的重要交通纽带。同时,各铁路当局积极开展了对铁路沿线旅游资源的调查与宣传,适时采取多种便利旅游的措施,以及众多民国名人现身安徽铁路沿线风景名胜区所产生的影响力,使得安徽近代旅游业在铁路的推动下得以萌发并有所发展。     

19世纪华北青苗会组织结构与功能变迁--以顺天府宝坻县为例

华北青苗会组织的历史至少可追溯至19世纪初。早期的青苗会只是结构松散的临时看青组织。19世纪中期以降,以征派差徭为契机,青苗会逐渐演变为担负村庄各项公务且结构严密的村落自治组织。这一演变折射出咸同年间国家与乡村社会之间的新动向国家不断深入地方以攫取财源,乡村社会则在改造青苗会加以应对的同时实现了一定的自治。     

Endogenous Fractal Dynamics at Alpine Treeline Ecotones

Many of the hypotheses proposed to explain ecotones are based on an individualistic paradigm and are essentially static. While they include local feedbacks, they ignore the interactions between pattern and process across scales. These feedbacks in ecotones are nonlinear in nature and complicate the relations of pattern and process in vegetation, which, combined with observed fractal patterns, suggests a complexity science approach to investigate ecotone dynamics. A cellular automaton of alpine treeline, including nonlinear, local, positive, and negative feedbacks in tree establishment and mortality, as reported in field studies, is used as a model system. Fourier analysis of simulated alpine treelines shows fractal patterns across the treeline landscapes, which are created by patch development. The temporal evolution of the spatial pattern is also fractal. Landscape scale linear correlations between spatial pattern and the rate of advance of trees into tundra arise from localized nonlinear interactions. A tree-patch-landscape scale explanation of pattern–process interaction is proposed in which the endogenous feedbacks determine the spatial and temporal fractal properties of the ecotone. The simulated treeline advance exhibits self-organized complexity and may indicate a potential strategy for monitoring change.     

近年来世界性反美主义研究综述

近年来,国内外学者对反美主义进行了较大规模的研究。这一研究加深了人们对反美主义概念的深入理解和认识。本文通过对反美主义概念、类型、根源和影响四个方面的学术梳理,阐述了国内外学者在这一问题上的研究成果,同时也指出了研究不足的方面和值得进一步探讨的问题。