In-Plane Seismic Response Analyses of a Historical Brick Masonry Building Using Equivalent Frame and 3D FEM Modeling Approaches

ABSTRACT

This article aims at contributing to the seismic performance assessment of a historic brick masonry building by finding a strength reduction coefficient through the use of linear and nonlinear modeling approaches, using Finite Element Method and Equivalent Frame modeling. To reduce the uncertainties, ambient vibration tests (AVT) were implemented. Series of simulations was performed using nonlinear dynamic analyses and incremental dynamic analysis curves were compared with the pushover curves. Results indicate that the mass-proportional pushover curve meets the mean of results obtained from IDA and the strength reduction coefficient falls into the range given in EN 1998–1 for unreinforced masonry.     

受控冷冻灭虫法的风险控制

受控冷冻灭虫的关键在受控,受控指标包括冷冻温度、降温速度与冷冻时间,受控的目的是要达到彻底灭虫。冷冻温度与降温速度直接影响到被冷冻物品的形体安全,保障物品安全为前提的受控冷冻灭虫需要管控风险。基于文献分析、相关问题的调研与理论研究发现,温度不够低、降温速度不够快以及灭虫时间过短都会造成灭虫不彻底的风险。极端低温与快速降温带来物品的损伤与被冷冻物品的材料性质相关,将在极端低温与热冲击力下必然会损坏的材料排除在冷冻灭虫的许可范围之外,科学地选择冷冻温度与加强冷冻灭虫过程管控,可使受控冷冻灭虫化险为夷,即以保证藏品安全为前提的彻底灭虫。     

流散欧美的良渚古玉

20世纪初,中国古物大量流散欧美,价格高、易携带的古玉尤为大宗。笔者于1979年-1980年曾旅行探访20余所博物馆,在各馆库房仔细研究玉器。到1990年代,再多次前往重要的馆藏从事专题研究。"良渚玉器上的刻画符号"就是当时我密切关注的专题之一。在本篇中,笔者除回顾百余年流散欧美的良渚古玉收藏及出版情况,介绍四件圆周有刻符的良渚玉璧外,也略论约16至20世纪仿赝良渚古玉的特征。     

The Role of Provinces,States, and Territories in Shaping Federal Policy for Indigenous Peoples’ Health

ABSTRACT

Under both Canadian and United States law, the availability and quality of healthcare and health services to Indigenous peoples are primarily a federal responsibility. Nevertheless, sub-national authorities—most importantly provinces, states, and territories—play a crucial role by virtue of covering (often through federal mandate) services, and regulating health facilities and health personnel off-reserv(ation). While both federal governments have undertaken efforts to transfer, within their fiduciary obligations, their responsibilities for Indigenous peoples’ health to the management of Indigenous peoples themselves, that transfer has considered or included provincial, state, and territorial authorities and resources unevenly, and, in some cases, in tension with the objectives of respecting standards for quality and access. This article applies the methodology used by Canadian researchers of the sub-national health authority issue to the health transfer experience in the United States. The article summarizes findings that demonstrate similar deficiencies as those present in the Canadian transfer process. The article further outlines the experiences of Hawai`i and Ontario as offering models through which to address some of these deficiencies. The article finally suggests that there is a positive relationship between greater participatory models adopted by provinces, states, and territories and better health outcomes among Indigenous groups so included.     

Fannin’ Flies and Tellin’ Lies: Black Runaways and American Tales of Life in British Canada before the Civil War

Fannin’ Flies and Tellin’ Lies examines the many falsehoods told by slaveholders in the American South to prevent enslaved Blacks from running away to British Canada throughout the antebellum. Blacks were wrongly instructed on Canada including fabrications ranging from the Monarch would demand half of their earnings to rice was the only crop that could be grown in the British colony. At times the lies were totally inaccurate and humorous; on occasion they were half-truths or white lies, but indefinitely these falsehoods, instead of misinforming Blacks, suggested to them the benefits of Canada. Blacks deconstructed and reacted to lies by concealing their desire to defile the institution of slavery by flight to Canada and turned the art of lying into a tool of insurrection and a means of greater liberation.     

Tribal Sovereignty and the Problem of Difference in Environmental Regulation: Observations on “Measured Separatism” in Indian Country

Abstract: The legal and juridical sovereignty of American Indian nations is supposed to help Native peoples maintain their own distinct political and cultural communities. In the context of environmental issues, this means that tribal governments have both the inherent and statutory right to set their own environmental standards, which have the potential to protect tribal peoples and their natural resources in culturally relevant ways. In the past, the US Supreme Court has sought to curtail this kind of sovereignty when the due process of non‐Indians might be hindered. In this article, we look at why tribal environmental sovereignty can and should address the issues of due process in the context of environmental regulation in tribal borders, and make a call for this to be done in a way that supports American Indian tribal sovereignty. Moreover, we connect these issues to the current legal and juridical struggles of other environmental justice groups and the need for more meaningful participation in environmental regulation within the nation‐state for all cultural minorities.