BOOK REVIEWS

Book Reviews in This Article: Trois ?uvres Inédites de mystiques musulmans: āqq? al-Bal?, Ibn ?, Niffarā. By Paul Nwyia. The Formative Period of Islamic Thought. By W. Montgomery Watt. The Arab Mind. By Raphael Patai. l?m? al-Adab al-M?r f? Mir? (Bio-bibliographical Critical Series), No. 1, h?āūsayn. By Hamdi Sakkut and Marsden Jones. A History of the Crusades. Kenneth M. Setton, general editor. Volume III, The Fourteenth and Fifteenth Centuries , edited by Harry W. Hazard. The Muslim Dilemma in India. By M. R. A. Baig. Who is Maudoodi ? By Maryam Jameelah. A Tacit Alliance. By S. K. Crosbie.     

Tracking local dwelling changes in the Chittagong Hills: perspectives on vernacular architecture

Historically, geographers, anthropologists and colonial British administrators (1860–1947) frequently mentioned two ethno-geographical categories – khoungtha and toungtha – when referring to the tribal groups in the Chittagong Hills of Bangladesh. Some of these early works considered the livelihood patterns of these groups and the nature of their social and economic interactions. However, a discussion of the changes to their vernacular built environment has escaped any serious investigation. Using empirical findings, this article examines the changes to architectural practices of lowland and highland groups in the socially and ethnically complex region of the Chittagong Hills. Narrowing the discussion to the toungtha Mru ethnic group, this article also examines religious patterns, building techniques and spatial changes in a remotely placed, relatively inaccessible part of the hills where the built environment is still a strong cultural priority.     

Seismic Response of Secondary Systems Supported by Torsionally Yielding Structures

Substantial damage sustained during several recent earthquakes was non structural in nature. The economic consequence in terms of non structural component damage far exceeded the structural damage. Currently, there are several analytical studies that address the interaction between non structural components or Secondary systems (S-systems) and the main supporting structure or Primary system (P-system). Only a few of these analytical approaches have been proposed to evaluate and characterize the response of the S-systems attached to torsionally coupled P-systems. In addition, the experimental verification for the analytical approaches is scarce.

In the current study, the results and observations of an experimental research program conducted to characterize the behavior of both stiffness eccentric and mass eccentric torsionally coupled Primary-Secondary systems (PS-systems) are presented. From this experimental investigation it was found that the torsional yielding of the primary system has significant implications on the deamplification of near tuned secondary system response. The location of the S-system mounted on the P-system affects the peak response amplification, and interaction with the coupled P-system.     

Monitoring the 1997 flood in the Red River Valley using hydrologic regimes and RADARSAT imagery

In this study, we attempt to relate hydrologic regimes of the 1997 flood in the Red River Valley to the areal extent of flooding, determined from RADARSAT imagery. We obtained ten scenes of RADARSAT imagery, from 27 April to 1 July, including bitmaps delineating flooded areas for each date, from the Manitoba Centre of Remote Sensing. These images were co-registered using an image-to-image registration process. By overlaying these flood maps in chronological order, we compared the areal extent of flooding with the hydrologic regimes of the Red River, expressed as relative depths of flooding above the bankful stage at selected gauging stations. The results of the study indicated that the area of flooding on 4 May (1,984 km ² ) corresponded well with the highest flood levels at several gauging stations. A previous scene on 27 April showed a larger area under water, but visual inspection of the processed imagery indicated a lack of conformity between flood level regimes and the areal extent of flooding on this date due to surface detention of pre-flood storm runoff. Thus, the RADARSAT imagery represented the flood regimes adequately only when its interpretations were combined with hydrologic analysis and visual inspection of surface characteristics of the floodplain.