Flexural toppling failure is a common mode of natural and artificial rock slopes, which has caused serious damage to human life property. In this work, an advanced numerical method called the Universal Distinct Element Code (UDEC) was used study mechanism flexural failure. total, more than twenty slope models were built analyzed. Two new parameters (displacement discontinuity transition coeffic...

The paper deals with the design of cognitive artefacts. It is supported that both normative and descriptive design approaches fail to acknowledge the co-adaptation between users and artefacts; this leads to the so-called design paradox and obstructs the co-evolution of practice and artefacts. In the first section, the paper discusses the task-artefact cycle and presents examples showing that th...

Physics|Solid State) STRESS FLUCTUATIONS IN CONTINUOUSLY SHEARED GRANULAR MEDIA by Brian J. Miller Department of Physics Duke University

An abelian sandpile is a collection of indistinguishable chips distributed among the vertices of a graph. More precisely, it is a function from the vertices to the nonnegative integers, indicating how many chips are at each vertex. A vertex is called unstable if it has at least as many chips as its degree, and an unstable vertex can topple by sending one chip to each neighboring vertex. Note th...

Electro-optic spectral shearing interferometry is implemented for the highly sensitive characterization of ultrashort pulses from a free-running source. A simple phase-locked-loop clock recovery circuit is used to extract the high-frequency microwave clock signal to drive the phase modulator for spectral shearing. We demonstrate accurate full temporal characterization of 200-fs pulses from an o...

this article deals with a tentative method of concrete compression and the measurement of compressional resistance. the subject of free fall for concrete compression has not received adeqaute attention so far. in this research, the compresional resistance of compressed concrete with free fall is compared with the compressed concrete by trembling bed. to do so, 176 cylinderical testing case with...

Digital shearograohy has demonstrated great potential in revealing defects in objects especially in detecting delaminations in composite materials. It is gaining more and more acceptance by automotive and aerospace industries in the field of nondestructive testing (NDT) of composite materials. A key optical component used in shearography is a shearing device in which the shearing amount, sheari...