Ground Improvement to Reduce Liquefaction Potential Using Vibrocompaction and Stone Columns

With the rapid pace of industrialization, structures are being designed and constructed in the flood plains of major rivers. In earthquake prone areas, a fundamental issue in the design and construction of structures on saturated sandy soils is weather or not the design earthquake could initiate liquefaction in the form of lateral spreading, sand boils, settlement, or cracking. Many different methods, including vibrocompaction, deep dynamic compaction, compaction piles, geopiers, deep mixing, vibratory probes, displacement/compaction grout, etc., have been used to reduce the liquefaction potential at various sites. Use of vibrocompaction to densify cohesionless soil is becoming more common and cost effective. For projects in the New Madrid seismic zone (NMSZ) another challenge to perform site specific analysis is the lack of recorded ground motions. Therefore, synthetic time histories need to be generated using the attenuation models applicable to the region. This paper provides details about a site specific study performed for a site in the bootheel area of Missouri, and results of liquefactions analysis and ground modification achieved using vibrocompaction

Dating agricultural terraces in the Mediterranean using luminescence : recent progress and challenges

Funding: This paper derives from the TerraSAgE project (Terraces as Sustainable Agricultural Environments) which is funded by the UK Arts and Humanities Research Council [grant number: AH/T000104/1].Agricultural terraces provide farmers in hilly landscapes with effective ways to increase the area available for crops. They mitigate the risks of soil erosion and promote crop productivity by slowing surface water runoff and retaining moisture. As in other parts of the world, terraces have been constructed and used in the Mediterranean for millennia. The availability of terraced agriculture had important socio-economic, ecological, and environmental implications for past societies. However, the chronology of construction, use, and abandonment of terraces in different regions remains uncertain. A more robust set of chronological data will allow better assessment of whether terrace agriculture was a resilient strategy in the face of past economic or ecological instability and, in turn, inform how terraces could be used to address future agricultural and environmental challenges. In this paper, we review the application of luminescence dating to terrace sediments, the key challenges involved, and the currently published data which include over 250 luminescence ages. We also discuss the use of a multidisciplinary approach involving other geoarchaeological tools (e.g., use of GIS analyses, field-based luminescence readers, and micromorphology) to enhance the ways that past terrace systems can be understood. Terrace systems are inextricably linked to sustainable land use across the Mediterranean. Luminescence dating methods, therefore, have a crucial role to play in understanding the complexities of past and future landscape change.Publisher PDFPeer reviewe

Between Big City and Authentic Village: Branding the Small Chinese City

While recent academic research has already produced an impressive corpus on big cities such as Shanghai and Beijing, the small Chinese city has been mostly ignored. In this article, I suggest that consideration of the small city can bring a new perspective on the wider urban fabric of which it is an element. Although small city governments have embraced urban entrepreneurialism with the same enthusiasm as China’s big cities, different configurations of space, branding and the everyday have nevertheless resulted. My case study of Kaili in Guizhou province indicates that the small city exists in a complex relationship with the big city and the village; it is pulled towards large-scale urbanization while simultaneously attempting to construct a unique city image based upon the evocation of rural cultural practices. The perspective from the small city thus suggests the need to consider the rural-urban divide – long a dominant geographical imagination of China – alongside other geographies, including a triad of the small city, the village and the big city

Site Specific Ground Response and Liquefaction Analyses for a Project Site in New Madrid Seismic Zone

ABSTRACT: With the rapid pace of industrialization, structures are being designed and constructed in the flood plains of major rivers. In high seismicity areas, such as the New Madrid seismic zone (NMSZ), International Building Code (IBC) recommends that a site specific ground response analysis be performed if the site soils have potential for liquefaction. For projects in the NMSZ one of the major challenges for performing site specific seismic analysis is the lack of recorded ground motion data. Therefore, synthetic time histories need to be generated using the attenuation models applicable to the region. This paper provides detailed information about site specific shear wave velocity measurements using downhole method and development of site specific seismic parameters to be used for the design of structures at a project site in the bootheel area of Missouri, USA which is located in the NMSZ

Learning by doing: Cross-border mergers and acquisitions

We rely on organizational learning theory and strategic momentum research to examine the international merger and acquisition (M&A) activities of a sample of S&P 500 firms. We hypothesize that the learning associated with a firm's prior acquisition experience increases the likelihood the firm will engage in subsequent international acquisitions. Results from a sample including company-country level data indicate that both prior domestic acquisitions and international acquisitions influence the likelihood of acquisitions in foreign markets by U.S.-based firms. We also find that prior experience with international acquisitions is more predictive of subsequent international acquisitions than prior domestic acquisition experience. Moreover, we find that the acquisition experience within a host country had a stronger influence on subsequent acquisitions within that country than other prior non-host country international acquisition experiences.Acquisitions Cross-border Organizational learning Momentum

Opportunities for Local Food Systems Research and Extension in the South- A Land Grant University System Initiative

Acknowledging regional differences in the development of Local Food Systems across the United States, Southern Experiment Station Directors and Extension Directors decided to commission the development of an effective collaboration plan between southern Land Grant University (LGU) faculty in the area of Local Food Systems (LFS). The United States southern region’s unique characteristics, such as the historically large concentration of underserved and small farms (Goodwin 2013), could impose unique challenges and opportunities for the development of LFS, and therefore a regional approach to addressing this region’s unique needs may be appropriate. With the support of the Southern Risk Management Education Center (SRMEC), the SRMEC Local Food Systems Work Group was created in 2013. During the first two years, this group identified research and extension priorities for LFS in the south. The ultimate goal of this group is to establish LFS programing that can help the southern LGU system more effectively address key factors supporting the successful development of LFS in this region. This group identified ten research and extension priorities for LFS in the south, also represented graphically in Figure 1, from the perspective of agricultural economics and risk management: 1) market and supply chain logistics; 2) financial and risk management for LFS; 3) economic, social, and environmental outcomes; 4) consumer demand; 5) food safety; 6) financial and risk management for enterprises; 7) food security; 8) food access; 9) food system policies; and 10) general knowledge associated with LFS. A complete discussion of identified priorities one to five was published in an invited issue of Choices entitled “Developing Local Food Systems in the South” (Goodwin 2013). In this issue, the SRMEC LFS Work Group specifically discussed the role of the LGU system in supporting each of the priorities identified. For example, this group highlights the important role the southern LGU system plays in the development of LFS-focused education and capacity building programs to support LFS development (Woods et al. 2013). Additionally, this group acknowledges the importance of creating a network of researchers and extension professionals providing objective feedback on research areas that could guide the allocation of resources for the development of LFS such as the evaluation of social, economic, and environmental outcomes associated with LFS (Lamie et al. 2013). Future plans of the SRMEC LFS Work Group include expanding the discussion of priorities six to ten, as well as the identification and implementation of research and extension outreach collaboration opportunities