The Afghanistan-Pakistan Wars, 2008-2009: Micro-geographies,Conflict Diffusion,and Clusters of Violence

A team of political geographers analyzes over 5,000 violent events collected from media reports for the Afghanistan and Pakistan conflicts during 2008 and 2009. The violent events are geocoded to precise locations and the authors employ an exploratory spatial data analysis approach to examine the recent dynamics of the wars. By mapping the violence and examining its temporal dimensions, the authors explain its diffusion from traditional foci along the border between the two countries. While violence is still overwhelmingly concentrated in the Pashtun regions in both countries, recent policy shifts by the American and Pakistani governments in the conduct of the war are reflected in a sizeable increase in overall violence and its geographic spread to key cities. The authors identify and map the clusters (hotspots) of conflict where the violence is significantly higher than expected and examine their shifts over the two-year period. Special attention is paid to the targeting strategy of drone missile strikes and the increase in their number and geographic extent by the Obama administration.     

‘The Scars of War’. Displacement,Dislocation and the Aircrew of the Forces aériennes françaises libres 1940–44: Towards a Quantitative and Qualitative Analysis

This article examines the processes of displacement and dislocation for the aircrew that came together in 1940–42 to form the Forces aériennes françaises libres (FAFL). It uses quantitative and qualitative methodologies to examine the background and motivations of the men of the FAFL. It also seeks to utilise current understandings about the French right in examining the political impulses of Free French pilots. The article concludes with some suggestions about the long term significance on French life of the displacements and dislocations of 1940–42.     

Distribution of Lateral Forces in Base-Isolated Buildings Considering Isolation System Nonlinearity

The ASCE 7 equivalent lateral force method for base-isolated buildings applies a triangular distribution of forces to the superstructure. This distribution attempts to approximately account for the observed effects of isolation system nonlinearity on the superstructure response, but a more rational approximation is needed. Using nonlinear regression analysis of median response data from nonlinear response history analysis of representative systems, improved equations are developed to estimate the lateral force distribution in the superstructure. The ASCE 7 distribution, a revision considered by a SEAONC committee, and the improved distribution developed here are evaluated. Only the improved equations are accurate over many system parameters.     

A Linguistic Survey of Khorasan: Implications for Language Isolation,Language Change,and Contact Linguistics

This paper describes and analyzes data from a number of Modern Iranian dialects spoken in Khorasan in the east of Iran which are unusual among the other Western Iranian languages in that they have grammaticalized a split tense-sensitive alignment in indexation, compared to other Iranian languages whose indexation splitness is sensitive to both tense and transitivity. These dialects are the former dialect of Birjand in the late nineteenth and early twentieth century, the present-day dialect of Ferdows, Khanik, and Se-Ghal’e. The findings are put in the context of the available data from the Classical Persian texts to show that the tense-sensitive splitness mentioned above is traceable in those texts. A number of external factors are discussed which seem to have been influential in the restructuring of the split-alignment of the former dialect of Birjand into a uniformly nominative-accusative alignment in terms of indexation as observed in the present-day dialect of Birjand. It is proposed that this restructuring is an instance of simplification. The three other dialects cited above are endangered in the sense that they can undergo the same kind of restructuring as happened to the dialect of Birjand.     

A Single-Run Dynamic-Based Approach for Pushover Analysis of Structures Subjected to Near-Fault Pulse-Like Ground Motions

In this paper, a fairly effective procedure called dynamic load pattern (DLP), is proposed to account for the effects of near-fault ground motions in estimating the seismic demands of structures from pushover analyses. The seismic demands are obtained by enveloping the results of single-run conventional first-mode and single-run DLP pushover analyses. Improving the estimation of target displacement is another objective, implemented by performing response-spectrum analysis. Three special steel moment-resisting frames are considered and the seismic demands resulting from DLP are compared to those from the nonlinear time-history analysis as a benchmark solution, as well as to those predicted from modal pushover analysis.     

Seismic Design and Response of Framed Structures with Stiffening Bracing Systems

Stiffening Bracing System (SBS) is proposed as an alternative to conventional braced frames. SBS is intended to reduce the floor accelerations while maintaining uniform inter-story drift along the building height. The system ensures that additional damping devices distributed over the building’s height work efficiently. An iterative design procedure is developed to maintain a desired target performance. The procedure accounts for higher mode effects and supplemental damping. A series of nonlinear response history analyses on braced frames with various heights demonstrated the adequacy of the proposed procedure in achieving target structural performance and seismic demand prediction.     

Investigation of the Optimum Height of Railway Embankments during Earthquake Based on Their Stability in Liquefaction

One of the most reported problems in the railway embankments is loss of their overall stability and major settlements due to liquefaction. Although several studies have been made on the stabilization of embankments, the effects of the influencing parameters on the stability of embankments during liquefaction have not been sufficiently investigated. The series of two dimensional plane strain finite element (FE) models were developed using multi yield surface plasticity model namely Prevost. The results were represented and discussed in terms of foundation excess pore pressure, embankment settlements and their failure modes. By analyzing the results, the optimum height of embankment which minimizes the settlement and failure cracks was derived.     

Liquefaction-Induced Lateral Load on Pile in a Medium Dr Sand Layer

One-g shake-table experiments are conducted to explore the response of single piles due to liquefaction-induced lateral soil flow. The piles are embedded in saturated Medium Relative Density (Dr) sand strata 1.7–5.0 m in thickness. Peak lateral pile displacements and bending moments are recorded and analyzed by uniform and triangular pressure distributions. On this basis, the observed levels of pile bending moment upon liquefaction suggest a hydrostatic lateral pressure approximately equal to that due to the total overburden stress. Using the experimental data, comparisons with current recommendations are made, and the Showa Bridge case history is briefly assessed.     

General Seismic Load Distribution for Optimum Performance-Based Design of Shear-Buildings

An optimization method based on uniform damage distribution is used to find optimum design load distribution for seismic design of regular and irregular shear-buildings to achieve minimum structural damage. By using 75 synthetic spectrum-compatible earthquakes, optimum design load distributions are obtained for different performance targets, dynamic characteristics, and site soil classifications. For the same structural weight, optimum designed buildings experience up to 40% less global damage compared to code-based designed buildings. A new general load distribution equation is presented for optimum performance-based seismic design of structures which leads to a more efficient use of structural materials and better seismic performance.     

Composite projectiles and hafting technologies at Ohalo II (23 ka,Israel): analyses of impact fractures,morphometric characteristics and adhesive remains on microlithic tools

This study focuses on the correlation between the production of backed microliths in the Levant during the late Upper Palaeolithic and their use as side elements of composite projectile weapons. The investigation is based on assemblage sample of microliths from Ohalo II, a 23,000 years old submerged campsite, and involves analyses of diagnostic impact fractures, location of adhesive remains and morpho-metric characteristics of the tools. Two distinct adhesive materials have been also analyzed, and the preliminary results indicate the use of both calcareous and organic substances.