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  • Nana Baah Appiah-Nkansah
    Journal of Developments in Sustainable Agriculture
    2009年 4 巻 2 号 93-105
    発行日: 2009年
    公開日: 2010/02/25
    ジャーナル フリー
    Ghana's agricultural sector is heavily dependent on rainfall, but the rainfall pattern is erratic, making the sector a high-risk venture for many investors. The Upper West Region annually experiences a short rainy season
    and
    a relatively long dry season (i.e., October to April). Irrigation is therefore essential for enhancement of agricultural production. A number of earth embankments have been constructed as dams
    and
    dugouts have been excavated throughout the region to create water reservoirs for irrigation, especially for dry season farming. However, the irrigation facilities are beset with problems. This paper presents a problem structure analysis of the irrigation systems in the region with the aim of proposing a feasible
    and
    sustainable scheme of irrigation infrastructure management. Additionally, a framework for institutionalizing Water Users Associations (WUAs) is developed. A reconnaissance study of selected irrigation facilities across the region identified the major problems. Interview
    sessions
    were also conducted with farmers who maintain irrigated plots,
    and
    the existing infrastructure was observed. Major challenges identified include a low sense of ownership
    and
    responsibility toward the management of the irrigation facilities on the part of the users, leading to their poor maintenance. For sustainable irrigation management, clarification of responsibilities
    and
    appropriate role sharing between the users
    and
    the Ministry of Food
    and
    Agriculture following the principles of Participatory Irrigation Management is recommended. The ministry should be responsible for provision of technical support services, effective monitoring
    and
    supervision of the WUAs, whereas the WUAs should ensure adequate maintenance
    and
    operation of the irrigation facilities.
  • *鳥原 英嗣, 仲嶺(比嘉) 三代美, 澳津 志帆, 山本 秀幸
    日本薬理学会年会要旨集
    2020年 93 巻 93_3-P-336
    発行日: 2020年
    公開日: 2020/03/18
    会議録・要旨集 オープンアクセス

    In Diamond-Blackfan anemia (DBA), about half of the patients have mutations in one of several ribosomal protein (RP) genes. The most frequently mutated gene (~25%) is the ribosomal protein S19 (RPS19), in which a hot spot for mutations between residues 52

    and
    62 has been reported. However, it is not clear why mutations in the ubiquitously expressed RPS19 gene specifically affect erythropoiesis. We previously showed in vitro that the 59th serine residue (Ser59) of RPS19 is phosphorylated by
    PIM
    1 kinase. Here we study the involvement of RPS19
    and
    PIM
    1 in erythropoiesis using zebrafish to determine whether phosphorylation could affect red blood cells production. We generated the rps19 knockdown zebrafish by injection of morpholino antisense-oligo (MO) at the one-cell stage. The rps19-deficient embryos (morphants) showed abnormal morphologies
    and
    a decreased number of red blood cells. Although in vitro synthesized rps19 mRNA rescued the aberrant phenotypes in morphants, the recuperation was not shown by substitution of Ser59 residue with alanine or aspartic acid. These observations suggest that reversible phosphorylation of Ser59 is important for the function of rps19. Therefore, we injected the MO against
    pim1
    , which phosphorylates Ser59 of rps19. The
    pim
    1 morphants showed abnormal head
    and
    tail,
    and
    a decrease in the number of red blood cells. Co-injection with synthetic
    pim1
    mRNA restored morphology
    and
    red blood cell count. These findings suggested that
    pim
    1 was related to erythropoiesis. Further consideration will be needed to yield any findings about the relationship between phosphorylation
    and
    erythropoiesis by using
    pim
    1 deficient fish.

  • 野上 仁昭, /, J. G. WANG
    地盤工学会論文報告集
    2004年 44 巻 1 号 125-142
    発行日: 2004/02/15
    公開日: 2008/02/29
    ジャーナル フリー
    A numerical method is developed for consolidation analysis of lumpy clay fillings by using the double porosity model
    and
    the meshless method. Lumpy clay fillings consist of inter-lump voids
    and
    a clay matrix, which further consists of
    soil
    frame
    and
    pores. When a load is applied to these fillings submerged in the water, pore water pressures are generated
    and
    dissipate in the inter-lump voids
    and
    matrix. The model accounts for the coupling between the deformation of the
    soil
    skeleton
    and
    the excess pore water pressures in both the matrix
    and
    inter-lump voids,
    and
    also the fluid exchange between the inter-lump voids
    and
    matrix. The meshless method based on the radial point interpolation method (radial
    PIM
    ) is used for spatial discretizations of displacement
    and
    pore water pressures. The order of interpolation function for the displacement is one order higher than that for pore water pressure to improve the numerical problem. Time domain is discretized through the backward Euler algorithm. The developed method is verified through a benchmark problem
    and
    two centrifuge tests. Finally, the effects of variations of various key parameters on the consolidation process are numerically studied for one-dimensional
    and
    plane strain (two-dimensional) problems. It is found that the developed numerical approach can successfully simulate the consolidation behavior of lumpy clay fillings despite their complex behaviour.
  • Soji SHINDO
    Rural
    and
    Environment Engineering

    2000年 2000 巻 38 号 89-92
    発行日: 2000年
    公開日: 2010/10/27
    ジャーナル フリー
  • *有賀 一広,
    Sessions
    , John
    日本森林学会大会発表データベース
    2005年 116 巻 4B07
    発行日: 2005年
    公開日: 2005/03/03
    会議録・要旨集 フリー
  • Omid Ghaffaripour, Golnaz A. Esgandani, Arman Khoshghalb
    Japanese Geotechnical Society Special Publication
    2019年 7 巻 2 号 450-455
    発行日: 2019/04/30
    公開日: 2019/08/22
    ジャーナル フリー

    A fully coupled algorithm based on a recently developed meshfree method, called smoothed point interpolation method, is introduced for hydro-mechanical analysis of unsaturated porous media considering hydraulic hysteresis

    and
    material nonlinearity. A simple node selection scheme is adopted which ensures the non-singularity of the moment matrix in constructing the polynomial point interpolation shape functions. An effective stress based framework based on the work of Khalili et al. (2008) is followed in this study,
    and
    a hysteretic water retention model is taken into account which enables the evolution of water retention curve (WRC) with volumetric changes (Pasha et al., 2017). An elastoplastic constitutive model is employed within the context of bounding surface plasticity theory for predicting the nonlinear behavior of
    soil
    skeleton in unsaturated porous media. The applicability of the model is verified through several numerical examples.

  • 粉体および粉末冶金
    2022年 69 巻 3 号 Mtg3_2-Mtg3_3
    発行日: 2022/03/15
    公開日: 2022/03/15
    ジャーナル オープンアクセス
  • 粉体および粉末冶金
    2022年 69 巻 2 号 Mtg2_6-Mtg2_7
    発行日: 2022/02/15
    公開日: 2022/02/16
    ジャーナル オープンアクセス
  • 粉体および粉末冶金
    2022年 69 巻 1 号 Mtg1_6-Mtg1_7
    発行日: 2022/01/15
    公開日: 2022/01/15
    ジャーナル オープンアクセス
  • AKIRA MURAKAMI, TATSUYA SETSUYASU, SHIN-ICHI ARIMOTO
    地盤工学会論文報告集
    2005年 45 巻 2 号 145-154
    発行日: 2005年
    公開日: 2012/08/13
    ジャーナル フリー
    A formulation of the Element-Free Galerkin Method (EFG method), i.e., one of the mesh-free/meshless methods developed in the field of computational mechanics for solving partial differential equations, is furnished for consolidation within finite strain
    and
    its validity for application to
    soil
    -water coupled problems is examined through a numerical analysis. The numerical strategy is constructed to solve a set of governing equations, e.g., the equilibrium for the nominal stress rate
    and
    the continuity of pore water,
    and
    the numerical discretization of the weak form of the governing equations leads to an updated Lagrangian scheme. The accuracy of the proposed numerical strategy is examined through an analysis of unconfined compression tests
    and
    simple shear tests under undrained
    and
    plane strain conditions through a comparison of stress paths integrated directly from the Cam-clay model within the framework of finite strain. It is also revealed that the particular type of weight function to be adopted in the moving least-squares (MLS) approximation, even in the same order, can determine the resultant shape functions of the EFG method for both the displacement
    and
    the pore water pressure field such that they are smoother than those of the usual FEM. The functions are advantageous in that they avoid spatial instability in the numerical solutions for pore water pressure under undrained conditions appearing in saturated
    soil
    column tests, where the shape function of the pore water pressure in the conventional FEM computation is adopted as a lower order than that of the displacement to remedy this type of numerical difficulty. To emphasize the applicability
    and
    the feasibility of the mesh-free computation, the consolidation phenomena are demonstrated in the analysis of a punch problem for a soft
    soil
    foundation which has stress singularity under both ends of a rigid loading platen for the same problem which Yatomi et al. (1989) solved with FEM.
  • Nguyen Anh Thu, Phan Chi Anh
    オペレーションズ・マネジメント&ストラテジー学会論文誌
    2012年 3 巻 1 号 55-73
    発行日: 2012年
    公開日: 2017/08/01
    ジャーナル オープンアクセス
    The knowledge-based management theory developed by Nonaka has been highly appreciated worldwide
    and
    proved to be an effective model for Asian countries. In this study, a case of a successful ODA project in Vietnam is analyzed based on knowledge-based management theory. The study found that the knowledge created in the Project was the product of SECI process,
    and
    multi-layered “ba” was an important factor for its success. All the stakeholders
    and
    related parties took their parts in the knowledge creating process. This management model has addressed some common shortcomings of many organizations in Vietnam, which is the lack of active
    and
    effective participation of members. These findings contribute as an important evidence for further application of knowledge based management not only to firms but also to other organizations,
    and
    especially to ODA projects.
  • Kanezo TAKEUCHI, Hikaru TSUTSUI
    Rural
    and
    Environment Engineering

    2001年 2001 巻 40 号 3-32
    発行日: 2001年
    公開日: 2010/10/27
    ジャーナル フリー
  • S. N. MALARVIZHI, ILAMPARUTHI
    SOILS
    AND
    FOUNDATIONS

    2007年 47 巻 5 号 873-885
    発行日: 2007年
    公開日: 2011/01/27
    ジャーナル フリー
    Stone columns, one of the most commonly used
    soil
    improvement techniques, have been utilized worldwide to increase bearing capacity
    and
    reduce total
    and
    differential settlements of structures constructed on soft clay. Stone columns also act as vertical drains, thus speeding up the process of consolidation. However, the settlement of stabilised bed is not reduced in many situations for want of adequate lateral restraint. Encasing the stone column with a geogrid enhances the bearing capacity
    and
    reduces the settlement drastically without compromising its effect as a drain, unlike a pile. The behavior of the encased stone column stabilized bed is experimentally investigated
    and
    analysed numerically. In the numerical analysis, material behaviour is simulated using Soft
    Soil
    , Mohr Coulomb
    and
    Geogrid models for clay, stone material
    and
    encasement respectively
    and
    is validated with experimental results. The parametric study carried out on varying the L/D ratio (L=length of the column; D=diameter of the column) of column, stiffness of geogrid
    and
    angle of internal friction of stone material gives a better understanding of the physical performance of the encased stone column stabilized clay bed.
  • Asis Mazumdar
    Journal of Developments in Sustainable Agriculture
    2007年 2 巻 1 号 59-65
    発行日: 2007年
    公開日: 2007/07/13
    ジャーナル フリー
    India is facing increasing water stress due to population growth, increase in water demand, vulnerability from climate change
    and
    deterioration in water quality from domestic as well as industrial
    and
    agricultural pollution loads. India occupies about 2.45% of the world area
    and
    has a 5% share of the global fresh water resources
    and
    with this share of vital natural resources approximately 16.87% of the world population is to be catered. Currently the population of India is a little over 1 billion
    and
    it is expected to reach a figure of approximately 1.5 billion by the year 2050. The water availability per capita per year at present is 1730.6 CM (m3)
    and
    has almost reached to water stressed (<1700 CM) conditions.
    Despite the tremendous economic development
    and
    growth of industries
    and
    service sectors, the livelihood of approximately 68% of the Indian population depends on agriculture directly or indirectly. More than 70% of its population lives in rural areas although there is an increasing trend of urbanization in the last two decades. Irrigation water accounts for approximately 90% of the total utilization of water resources. India stands at a crossroads in institutional options for natural resources management at the local
    and
    village levels. The emphasis on future options like watershed development through participatory approaches coupled with sustainability issues is now widely recognized as a potential approach for vitalizing the rural economy.
    Climate variability in India in terms of rainfall
    and
    temperature has noticeable spatial
    and
    temporal variations. Even after achieving full irrigation potential from surface
    and
    sub-surface water resources, a major portion of cultivated area shall remains rainfed. Furthermore, the conditions may deteriorate with severity of droughts
    and
    intensity of flash floods under a climate change scenario. In this article different measures for
    soil
    moisture conservation through rainwater harvesting on a watershed basis in problematic Laterite, coastal saline
    and
    hill zones of West Bengal State of India are discussed.
    Although in recent years, both Government
    and
    Non-Government Organizations have stepped up their efforts in water conservation by rainwater harvesting on a watershed basis through a participatory approach, the Government of India's Commitment to Participatory Irrigation Management (
    PIM
    ) with the help of Water Users Associations (WUAs) needs to be strengthened through adoption of a framework from the state level down to the village level. An attempt is made in this article to highlight some key factors in the structural framework as well as in the operation domain of
    PIM
    involving WUA from the Indian perspective.
  • 岡村 耕二
    システム/制御/情報
    2002年 46 巻 6 号 317-321
    発行日: 2002/06/15
    公開日: 2017/04/15
    解説誌・一般情報誌 フリー
  • Mamata Swain, Deepak Kumar Das
    Journal of Developments in Sustainable Agriculture
    2008年 3 巻 1 号 28-39
    発行日: 2008年
    公開日: 2008/08/12
    ジャーナル フリー
    During the last decade, most of the major states of India have undertaken profound reform measures in the irrigation sector to facilitate farmers' participation in irrigation management either under externally aided irrigation development
    and
    agricultural intensification programs or through state government initiatives. These states emphasize decentralization of water management
    and
    empowerment of water users by encouraging the farmers to form Water Users Associations (WUAs) to take over the responsibility of operation
    and
    maintenance of downstream parts of the irrigation system, distribution of water among water users,
    and
    collection of water rates. Although thousands of WUAs have been formed across India
    and
    these have taken over the management functions of irrigation systems, the functional efficiency of WUAs in ensuring efficient water use
    and
    equitable water allocation is far from satisfactory. A careful examination of the implementation of participatory irrigation management (
    PIM
    ) in India reveals that the process is fraught with many difficulties due to heterogeneity of farmers, caste-class cleavages, physical system inefficiency, half-hearted support from the irrigation bureaucracy, lack of committed local leadership, inadequate capacity building,
    and
    lack of proper incentives. The ultimate success
    and
    sustainability of the
    PIM
    movement depends on some fundamental factors, such as cohesiveness, common interest
    and
    collective efforts of water users, effective leadership of the office bearers of WUAs, political will of the party in power, bureaucratic commitment of irrigation executives, governmental patronage, legal support, financial viability of WUAs,
    and
    the catalyzing role of the change agents. To achieve the intended benefits of
    PIM
    , an integrated
    and
    comprehensive reform is necessary.
  • ICHIRO KOMURA, KAZUHIKO YAMADA, SHIN-ICHIRO OTSUKA, KAZUO KOMAGATA
    The Journal of General
    and
    Applied Microbiology

    1975年 21 巻 4 号 251-261
    発行日: 1975年
    公開日: 2006/08/16
    ジャーナル フリー
    Phospholipid compositions were radiochemically studied on nocardioform
    and
    coryneform bacteria. Phosphatidylethanolamine (PE) was present in the strains of the genera Corynebacterium, Nocardia,
    and
    Mycobacterium. Cardiolipin
    and
    phosphatidylglycerol were found in all the genera tested. Sugar-containing phospholipids such as phosphatidyl-inositolmannosides
    and
    phosphatidylinositol were present in about half of the genera tested. The genera Corynebacterium was divided into two sub-groups by the phospholipid composition. Corynebacterium strains having a high GC-content exhibited the presence of a large amount of PE
    and
    those having a low GC-content a trace amount of PE. Nocardia
    and
    Mycobacterium were different from Actinomadura
    and
    Oerskovia in the point of phospholipid profile. The phospholipid composition of Nocardia
    and
    Mycobacterium was similar to that of the high GC-content group of Corynebacterium. From these findings, the phospholipid composition is considered to be useful for differentiation of coryneform
    and
    nocardioform bacteria.
  • ROBERT V. WHITMAN
    SOILS
    AND
    FOUNDATIONS

    1971年 11 巻 4 号 59-68
    発行日: 1971年
    公開日: 2008/02/29
    ジャーナル フリー
    This paper presents a quantitative method of organizing field observations concerning liquefaction
    and
    non-liquefaction during actual earthquakes. The ratio τc/σ^-V is evaluated for 13 sites affected by 8 earthquakes
    and
    plotted against relative density (τc is the average peak dynamic stress during the earthquake,
    and
    σ^-V is the vertical effective overburden stress, both evaluated at the critical depth). The effect of the duration of shaking is considered by means of a correction to τc/σ^-V. For recent fluvial deposits
    and
    uncompacted hydraulic fills, the critical level of τc/σ^-V for fine sands is about 0.15. This result is in reasonable agreement with results from laboratory investigation. More evidence is required concerning coarser
    and
    denser granular deposits.
  • HIROMICHI KITADA, SARVESH MASKEY, TARO IZUMI, HIROMU OKAZAWA
    International Journal of Environmental
    and
    Rural Development

    2024年 15 巻 2 号 143-150
    発行日: 2024年
    公開日: 2025/05/27
    ジャーナル フリー

    The world’s population is growing rapidly. Ensuring global food security is becoming increasingly urgent. Adapting to changes caused by climate change while maintaining food security

    and
    agricultural sustainability is difficult,
    and
    inter-state conflicts, together with energy
    and
    value chain issues, complicate food issues. There are synergies
    and
    trade-offs between agriculture
    and
    climate change which must be analyzed to inform future strategies. With the world population expected to exceed 9.7 billion by 2050, rice consumption is expected to increase significantly. Paddy farming is essential to meet demand in Southeast Asian countries where rice is the staple food, but its expansion can cause environmental problems due to methane emissions from paddy fields
    and
    the large amounts of water required for cultivation. Paddy farming in Southeast Asia is the main source of water consumption often exacerbating water scarcity in some regions due to water competition with other sectors. This study focuses on the synergies
    and
    trade-offs related to improving paddy farming in Southeast Asia. Improving rice production requires adaptation to climate change including drought
    and
    flooding,
    and
    the availability of water resources, fertilizer management,
    and
    smarter labor, leveraging synergies among these items to increase productivity
    and
    sustainability. On the other hand, these items also involve numerous trade-offs, such as increased greenhouse gas emissions labor costs,
    and
    labor demands. Therefore, we reviewed the literature on management strategies for rice production in the context of climate change. We focused our review on farmers’ participatory water management
    and
    the application of the Alternate Wetting
    and
    Drying Method
    and
    biochar for adaptation strategies for climate change. The results indicate that farmers are taking charge of irrigation systems through Participatory Irrigation Management (
    PIM
    )
    and
    Irrigation Management Transfer (IMT), giving them control over water use
    and
    maintenance. Alternate Wet
    and
    Drying (AWD)
    and
    biochar methodologies are climate change adaptation strategies for farmers that can maintain a favorable balance between synergies
    and
    trade-offs in promoting appropriate future water use in paddy fields.

  • YAMAMOTO TADAO, NOZAKI AKIHIRO, SHIMIZU KATSUYUKI, KUME TAKASHI, ABDISALAM JALALDIN
    International Journal of Environmental
    and
    Rural Development

    2017年 8 巻 2 号 64-69
    発行日: 2017年
    公開日: 2019/11/16
    ジャーナル フリー

    A stable supply of irrigation water is essential to ensure agricultural productivity in arid regions. To efficiently use the limited water resources, upgrading of hard infrastructure, such as reducing leakage from channels

    and
    installing drip irrigation,
    and
    of soft infrastructure, such as introducing irrigation management involving local farmers, is being pursued. This study reviewed the rationality of participatory irrigation management (
    PIM
    ) in Turpan, Xinjian, China. Turpan depends for its irrigation water on streams, pumped groundwater,
    and
    karez (qanat).
    PIM
    mainly involves management of irrigation water supplied from streams. Between 2013
    and
    2015, interviews with Turpan City’s Water Management Agency (WMA) branch office staff,
    PIM
    staff,
    and
    local farmers were conducted to collect information on water management. The findings showed that the founding of
    PIM
    organization resulted in the following benefits: (i) reduction of governing agency’s burden:
    PIM
    is now in charge of work that used to be performed directly by staff of the WMA branch office (ii) Prevention of illegal practices:
    PIM
    staff are elected from among local farmers, so there is a system of mutual surveillance. (iii) Smoother implementation of water management: Previously, there were conflicts between local farmers
    and
    staff from other regions, who were unaware of the local situation. Since establishment of the
    PIM
    , local farmers have taken charge of the water management, which facilitated communication between the water administrator
    and
    farmers. (iv) Enhanced interest in water conservation: Because farmers now directly manage their water distribution
    and
    maintain their infrastructure, they are more aware of the importance of conserving water. Regarding the disadvantages, during seasons with a risk of drought, water management requires operations 24 h a day
    and
    there are many housekeeping issues, so labor shortages are a problem. This latter issue occurred because the main source of finance is from water fees, which are set by a governmental agency. As a result, the
    PIM
    team could not secure a sufficient budget to hire more staff.

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