Several three-dimensional effects were observed in the performance monitoring data collected during excavation for the Ford Engineering Design Center (FEDC) in Evanston, Illinois. These responses are related to lateral deformations of the soil around the excavation walls, forces in the cross-lot and diagonal bracing that supported the temporary wall and...
An empirical procedure for fitting a complementary error function (erfc) to settlement and lateral ground movement data in a direction parallel to an excavation support wall is proposed based on extensive optical survey data obtained around a 12.8 m excavation in Chicago. The maximum ground movement and the height and...
Gentrification - the process in which higher income (and often younger) households displace lower income residents of a city neighborhood - has been occurring in many urban neighborhoods over the last few decades. This process changes the demographics, and often the essential character, of the neighborhood. As a result, we...
The paper deals with the behavior of fluid cement pastes, formulated from Self Consolidating Concretes (SCCs), and the experimental correlation of fundamental rheological properties, such as the yield stress and the viscosity, with measurements from field tests, such as the mini-cone slump flow test. As a matter of fact, several...
In this paper, the correlation of reflection loss measured by an ultrasonic shear wave reflection
method and the microstructure in cement-based material is investigated. Three cement pastes
(Portland cement type I) with different water-cement ratios (0.35, 0.50 and 0.60) cured at 25
°C were examined. The ultrasonic shear wave reflection...
The gradual evolution of the material properties of a cement-based material, i.e. the stiffness of cement paste, is the result of the continuous change of the microstructure with the progress of the hydration process. Based on an existing micromechanical model for the simulation of the shear and elastic modulus of...
This paper describes proposed schemes for describing and indexing two image collections and requirements for the software that would give the end-user access to thesaurus terms and a graphical display of the faceted classification structures of indexing records. Editorial cartoons comprise one collection, dance videos the other.
The issues discussed in this essay - the fundamental objectives of the Nigerian state, public accountability, and a code of conduct for state officials - have been central concerns throughout its post- colonial history. Underlying these debates have been differing views about the best political economy model for Nigeria. The...
A half-century of high revenues from petroleum export has failed to elevate more than a small percentage of Nigerians above the poverty level. The failure to manage the vicissitudes of global oil markets, and to grow other sectors of the economy, has led to constant budget deficits and unsustainable national...
In the years preceding the 1979 national elections, ideology featured prominently in political debates and consultations regarding the new constitutional order. Proponents of a social democratic system were particularly prominent. However, the actual formation of political parties, governed by the new requirements for national representation, and the resurgence of veteran...
The 1979 Nigerian elections reflected the dedication of Nigerians to pursue democratic governance and the severe challenges to be overcome. The sweeping victory of the NPN, and the election of Alhaji Shehu Shagari as president, required a last-minute manipulation of the formula for achieving victory in the first round. After...
The building of a trans-ethnic political space, and a nation that commands the loyalty of the country’s citizens, have been persistent aspirations of Nigerian governments. The 1979 elections demonstrated that, however much political party leaders may seek to build a national following, they are “trapped” by ethnic and other sectional...
The building of the Second Republic required a military government, which had been deeply engaged in shaping the Federation over almost fifteen years, performing as an impartial umpire in the electoral choice of its successors. This complex process is dissected in this article together with an analysis of the relative...
This article resumes the exploration of Nigeria’s political economy and the entrenchment of a prebendal mode of attitudes and behaviors. It takes up the shift to a mono-mineral export economy, the socio- economic proclivities of the dominant class, the considerable expansion in the state’s economic role, and the distinct pattern...
The forcible ending of Nigeria’s second attempt at constitutional civilian rule since independence in 1960 is a mixed story. The 1983 general elections were tarnished by violence and fraud. They took place in a context of economic decline and policy disarray. However, the opposition still retained an important share of...
In this essay, key features of Nigerian governance since independence are reviewed. The military had ruled the county for thirteen years and civilian politicians, in two phases, had done so for ten. Military governments involved significant participation by civilians, so there was overlap between these successive systems. Moreover, the military...
Cracking is one of the most common concerns cited by owners of structures adjacent to construction or mining blasting. While a large database of case studies documenting the relative insignificance of ground motion induced by responsible blasting compared to weather effects on cracks in nearby structures has been established, the...