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Formulated mathematical model and the developed finite-difference method and computer program that enables the effective exercise of computer modeling and optimization of high-speed processes of thawing of soils with the help of the magnetrons. As the primary modeling method used a variant of end-to-end “enthalpy” method without smoothing concentrated heat capacity. Implemented a series of informative...
A theoretical method to relate the electrical relative permittivity (dielectric constant) and thermal conductivity of sands is presented. Extensive previous work has been done to relate the physical state (void ratio, water content, and saturation percent) of sandy soils to the bulk thermal conductivity and bulk relative permittivity respectively. These parameters have always been observed isolated...
We developed a high-performance low-ordered unstructured finite-element solver for disaster mitigation simulations, and applied it to seismic ground strain analysis of Tokyo. Here we combined high performance computing methods for making a fast solver scalable up to the full K computer with 663,552 CPU cores. We also developed methods for high-performance matrix-vector computation using SIMD units...
This paper presents a device that is able to reproduce atmospheric discharges in a small scale. First, there was simulated an impulse generator circuit that could meet the main characteristics of the common lightning strokes waveform. Later, four different generator circuits were developed with the selection made by a microcontroller. Finally, the output was subject to amplification circuits that...
This paper presents a new heroic computing method for unstructured, low-order, finite-element, implicit nonlinear wave simulation: 1.97 PFLOPS (18.6% of peak) was attained on the full K computer when solving a 1.08T degrees-of-freedom (DOF) and 0.270T-element problem. This is 40.1 times more DOF and elements, a 2.68-fold improvement in peak performance, and 3.67 times faster in time-to-solution compared...
This paper presents an approximate formula for the evaluation of the peak value of lightning-induced voltages in overhead lines over lossy ground, which considers the front-time of the channel-base current. The formula is used in the assessment of indirect lightning performance of overhead power distribution lines, and its results are compared with results available in the literature. The formula...
China is endeavoring to implement the lunar exploration mission, namely Chang'e. In Phase III of the project, the aim is focusing on acquiring lunar soil sample and bringing them back to the earth. Due to the high efficiency of drilling in granular substance, a drilling and coring device is selected as the sampling tool to acquire the soil sample along the vertical direction. A novel flexible-tube...
In the mountain torrent disaster warning system, how to use high-performance embedded microcontroller controller and low consumption technology are the key problem. This paper designs a wireless sensor network (WSN) to adapt the request of mountain torrent disaster early-warning system. The sensor node collects the information such as soil water content, permeability coefficient, displacement and...
In this paper, the consolidation problem of composite foundation is studied to consider the non-uniform distribution of initial excess pore water pressure along depth and the radialvertical combined flows in a granular column. The general theoretical solutions are obtained by introducing a new initial condition. The consolidation theory of composite foundation advanced herein is distinguished from...
On the condition of different dam heights and different shapes of river valley, 3-D dynamical responses of concrete-faced rockfill dams subjected to different seismic intensity input are analyzed based on equivalent-linear model in this paper. The results show that, the distribution of the acceleration along the dam heights at the edge points on the central section is S-shaped; the acceleration increases...
Using wastewater as irrigation water presents arising tendency in China, however, little is known about the potential ecological impacts of the practice. Samples, such as soil and plants, were collected from the Panjin Shuangtaiestuarine wetland and used in the experiments to assess the effects of the soil microbial community added nitrogen. Supplemental nitrogen was added as NH4Cl to three treatments...
In this paper, the content of heavy metals of the sewage irrigation soil were determined and analysis around the second wastewater treatment plant in Tongliao, China, a total of 75 sampling points collected. The results showed that 6 sampling points of Hg were over the second standard values of "soil environmental quality standard" , and the contents of Cu, Zn, Pb, Cr, Cd, As and Ni were...
Three well-known spatial interpolation approaches, namely, kriging, inverse distance weighted, and slpine, were evaluated and used to identify hot-spots of soil available P in a hilly area. This study aims to evaluate different well-known spatial interpolation approaches for soil available P in a hilly area. Average Standard Error, Root Mean Square Error, Root Mean Square Standardized Error, and Mean...
39 indigenous plant species in 18 families were collected and investigated in four heavy-metal polluted sites. The tolerance and hyptoextraction characteristics of them to Cd, Pb, Cu, Zn and As were examined. In field survey, Bidens bipinnata, Artemisia dubia, Polygonum lapatuifolium, Chenopodium ambrosioides and Solanum nigrum showed to concentrate remarkable heavy metal in shoots. In the further...
The design of the ground heat exchanges is the key of the GSHP system. Borehole depth,flow velocity,soil initial temperature, operating mode , etc. are the main factors that affect the performance of ground heat exchanges. Tests the summer operating mode of the ground source heat pump system with different deep buried U-tube ground heat exchangers (60m,90m) built up in Shanghai district. The paper...
Progresses in the study of speciation and biological uptake of arsenic in soil are introduced. The researches on bioavailability of arsenic are summarized, and the main factors which affect arsenic bioavailability are emphatically discussed. Relationship between speciation and availability of arsenic is concluded and the concerned problems and future development orientation are pointed out.
This paper presents an approximate formula for the peak value of lightning-induced voltages in an overhead line, considering the ground resistivity and a trapezoidal lightning return stroke current waveform with typical parameters 3.8-μ s front time and 120-m/μ s velocity. It presents an improvement in a formula previously proposed by the authors. The formula is used with a probabilistic approach,...
Foundation pit engineering is composed of some inter-related and relatively independent sub-engineering which makes it possible to introduce the distributed parallel optimal method into foundation pit engineering design. Based on the genetic algorithm with intrinsic parallelism, a distributed three-level co-evolution model and its corresponding algorithm, which can realize collaborative optimal design...
The generating rule method is presented for incompatible and incomplete information of test data based on Bayesian theory. Firstly, the rule's conditional probability is calculated when the certainty (reliability) of the test data is the prior probability and the samples (supportability) is posterior probability. Then, Those rules whose conditional probability is bigger than a given threshold value...
Many domotic applications are quickly growing up in the digital home technologies domain. Installation of these systems allows improved security and comfort of a house through the integration of new digital technologies. Although these technologies can improve individual family member's social relationship and family relationships, child-parent relationship still remains the main question in such...
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