The Sanxingdui Moon Bay City Wall, in China, is built of pale-yellow sand and yellow-brown clay, and the yellow-brown layers are suffering severely. In order to discuss the desiccation cracks in a section of this wall, this paper conducts evaporation tests in laboratory and observes the variations in the characteristics of the boundary conditions of the bottom surface of the sample. The results show that the boundary conditions of the bottom surface of the sample consist of two free boundaries, two sliding boundaries, and one fixed boundary from the outside to the inside. During the drying process, the free boundary extends, but the fixed boundary shrinks; the sliding boundary also remains basically stable. We obtain the surface tensile stress distribution under different boundary conditions through stress analysis and deduce that the tensile stress distribution has a trapezoidal pattern. Moreover, we calculate the lower limit on the crack spacing of the sample using the energy method, and the double of the sum of the maximum sliding boundary length and the free boundary length is the upper limit to the crack spacing. Maintaining the stability of the soil moisture content of the site is the main factor in the protection of the earthen archaeological site under the humid conditions of the museum above the site. In order to reduce the water evaporation rate of the soil, the surface of the site should be coated by a protectant, the main determining features of which are permeability, tensile strength, and compatibility with the earthen site.
Today, with the increasing popularity of chip multiprocessors (CMPs), the memory wall problem becomes more serious. So, making better use of the shared cache on chip is more necessary on CMP than other multiple processors architecture. In this paper, we analyze the performance of traditional special decomposed parallel implementation of red-black algorithm, and find that this parallel model does not exploit the temporary data locality of this application. Then, we restructure red-black algorithm to be a producer-consumer thread pipeline. Under this thread-level pipeline model, consumer threads can reuse the data that the former producers have fetched into the shared cache. Then the number of cache miss reduces. Our experiment results show the application performance under the thread-level pipeline parallel model achieves about 40% additional improvement on core 2. Furthermore, we propose a synchronization mechanism in hardware to support this model, and discuss the scalability of this parallel model.
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