Nagaoka University of Technology Institutional Repository

    Modeling Redistribution of Soil Moisture Based on Numerical Solutions of Dimensionless Richards Equation

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    Soil moisture is one of the most important hydrological variables. Its redistribution has significant effects on evaporation, infiltration and groundwater recharge. Recently, its impacts on climate system are widely recognized. High non-linearity of Richards’ equation makes its practical applications very difficult. Many soil moisture accounting hydrological models or land surface schemes (LSSs) take soil moisture into account conceptually as an index of wetness. Even Richards’ equation based LSSs, used and evaluated in the global soil wetness project (GSWP) and/or the atmospheric model intercomparison project (AMIP), have only several thick soil layers. In order to develop a model to represent soil moisture redistribution in vertical direction for a better soil moisture accounting scheme, a high resolution numerical model solving dimensionless 1D Richards’ equation is developed and applied to 12 soils. By analyzing the soil moisture derived, two fomulae are proposed with parameters which can be estimated from a soil parameter. It is shown that these fomulae represented the behavior of soil water in soil column and at the surface fairly well

    Reducing vibration system of active control by means of FFT method

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    Recently an active control method is investigated to reduce the vibration of structure. The active control system in using the FFT and the inverse FFT method is explained in this paper. As concerns an active control, the data which represents state of vibrating structure is inputted in a computer and then a computer calculates the control force, after that output the data of the control force. In this method, these processes have to be done continuously, not to cut off the flow of input data and output data. However, a computer can do only one thing at one time, so this control system adopts three methods: the direct memory access (DMA), the multi task system using a vector signal processor (VSP), and the pipeline array processing (PAP). This paper also includes experimental examination. Applying this control system to the simple beam model, the effect of reducing vibration and that characteristic are examined. In the experiment, it can be confirmed that the active control mentioned this paper has the excellent ability to reduce vibration

    Fast decoupled load flow via axis rotation

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    A simple and effective techniwue to improve FELF convergence property on system of high R/X ratio is present. The main idea is again rotation to the load flow equations like one proposed by Haley, P.M and Ayres, M\^5)^. But, unlike latter we introduce only a single rotation to all equations which greatly simplify the formulation.Moreover, instead of working in rectangular coordinate the new method is in polar so that its in corporation into existing Fast Decoupled Load Flow (FDLF) require very little effort. Another different is on how the new method treat PV-Busses. Thisis the most difficult problem to hamdle since applying only a single rotation to all loadflow equations will create problem at PV-Busses which have only active power injection specified. Haley and Ayres solves this problem by leaving all PV-Bus equations unroated which may limiting the effectiveness of the rotation if some lines incidence to those busses have high R/X ratio. Numerical tests on IEEE 14, 30 and 57 busses systems of this method will try to know that this method has similar or better convergence in every case compared to Stott/Alsac, Amerongen’s or Rajicic/Bose FDLF

    D-aspartate oxidase activity and d-aspartate content of the senescence-accelerated mouse

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    Both of senescence-accelerated prone mouse strain (SAM P/1) and senescence-accelerated resistant mouse strain (SAM R/1) are known to lack D-amino acid oxidase activity. In this study we examined D-aspartate oxidase activity in these strains and found its presence in the kidney, liver and brain. The activities in each tissue of the two strains were mostly similar, and they were, more or less, comparable with those of normal ddY and ICR strains. We also examined D-aspartate content and found it to be present in these tissues and blood, in amounts comparable to those reported for other mouse strains. The results are in agreement with our previous observation on a mutant ddY strain (ddY/DAO-) that also lacks D-amino acid oxidase activity, and afford a second example of mouse strains lacking D-amino acid oxidase activity and having intact D-aspartate oxidase activity

    Nonverbal Expression in Personal Communication -Analysis of Motion Features and Meanings by Field Observation

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    In order to progress multi-modal interface using nonverbal expression in personal communication, we observed and investigated real living scene in terms of nonverbal communication. The observed data were analyzed by multi-variate analysis,e.g. quantification theory and clustering analysis. Owing to results of this analysis, we could extract structures of motion features, emotional and intentional expressions in nonverbal communications

    Shape Factors and Entrainment Coefficients in Inclined Thermal Model

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    The model of inclined thermal includes the various shape factors and the constitutive relationships. The shape factors, i.e. the ratio of the thermal area to the square of the maximum height, the ratio of the thermal perimeter to the maximum height and the ratio of the thermal length to the maximum height are considered to be functions of the slope angle. These factors are estimated by the experimental results of the area, the perimeter and the length of a thermal. The entrainment coefficients are also estimated by the various methods. The entrainment coefficients are seemed to be a function of the slope angle and also a function of the Richardson number. Finally the numerical analysis using the conservative thermal model are carried out. The numerical results can explain the experimental results well

    A Study of India A Technology Power in Asia (2)

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    The second part of the paper describes Indian technology development in three strategic sectors, le nuclear, space and information technology, within the context of the national strategic objectives India\u27s priority objective is to retain technology independence It was formulated through the historical and geopolitical situations of India after her independence The paper analyzes the implication of technology development in India to the evolution of international technology/export control regimes like as the Nuclear Non- proliferation Treaty (NPT), the Missile Technology Control Regime (MTCR), Nuclear-Suppliers Group (NSG) and the Wassenaar Arrangemen

    Dynamics of Conservative Inclined Thermal -Numerical Analysis and Image Analysis

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    The negative buoyancy of a conservative gravity current is kept into constant in the travel direction. On the other hand, negative buoyancy changes in the travel direction in a non-conservative gravity current. The saline thermal belongs to the conservative one. The particle gravity current belongs to the non-conservative one. The objectives of this study are to investigate the flow properties of the conservative inclined thermals by experiments, to obtain the velocity vectors using the image processor, and to compare the experimental results to the numerical ones of velocity fields. Also, the experimental results of the travel speed and the maximum thickness are compared with the numerical ones. The numerical model is based on the k-ε turbulence model and the SIMPLE model to discretize the partial differential equations. Those experimental results are explained by the numerical analysis. Three typical velocity vectors are found out, i.e. the roll up vectors in the front region, the strong vectors in the travel direction and the entrained vectors in the back region

    A basic study for the dementia diagnosing system by oculogyration

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    A new dementia diagnostic method is proposed based on the oculogyration including smooth pursuit eye movements. The response curves are processed with summation-averaging method in order to eliminate the random saccade eye movements. The subjects groups are composed of 19 Alzheimer type dementia, 18 normal elders and 7 young-volunteers. Several parameters including delay time, switching time of internal and lateral rectus muscles and peak response values are measured with successfully discriminating diagnosis between the patients and the normal. The method may be a useful arsenal for evaluation in the screening of the demented people in future
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