نتایج جستجو برای: hydraulic

تعداد نتایج: 28732  

2011
James D. Van de Ven Jennifer A. McInnis

The energy density of conventional hydraulic accumulators is significantly lower than competing energy domains. In this paper, a novel solution to improve the energy density of hydraulic energy storage, the flywheel-accumulator, is presented. The flywheelaccumulator integrates rotating kinetic and pneumatic energy storage, where the hydraulic fluid is used to change the mass moment of inertia o...

Journal: :پژوهش های خاک 0
محمد امیدی فرد دانش آموخته کارشناسی ارشد دانشگاه شیراز سید علی اکبر موسوی استادیار دانشگاه شیراز

hydraulic attributes play important role in hydrological studies, soil conservation, designing irrigation and drainage systems, soil conservation, and controlling soil erosion in watersheds. their measurements are very tedious and time consuming and due to high spatial variability, a large number of measurements are required for obtaining reliable values. nowadays, prediction of these attribute...

2016
Shu-Bin Zhang Jiao-Lin Zhang Kun-Fang Cao

Vulnerability segmentation, the condition under which plant leaves are more vulnerable to drought-induced cavitation than stems, may act as a "safety valve" to protect stems from hydraulic failure. Evergreen, winter-deciduous, and drought-deciduous tree species co-occur in tropical savannas, but there have been no direct studies on the role of vulnerability segmentation and stomatal regulation ...

2000
Bingru Huang David M. Eissenstat

In Citrus L. sp., specific root length of whole root systems has been correlated positively with root hydraulic conductivity, but there is little mechanistic understanding of the causes for this association. The hydraulic conductivity of individual roots in relation to root anatomical characteristics in seedlings of three citrus rootstocks [sour orange (SO) (Citrus aurantium L.), trifoliate ora...

Journal: :journal of chemical and petroleum engineering 2012
hossein jalalifar jaber taheri shakib

hydraulic fracturing in the fractured reservoirs plays a significant impact on the production rate. in this study, the hydrostatic condition is taken into account, the hydraulic fracturing operation was applied in every direction usinga written distinct element code. in each direction the hydraulic fracture is applied with different lengths and in each level the amount of production is predicte...

2013
Gretchen B. North Frank H. Lynch Franklin D. R. Maharaj Carly A. Phillips Walter T. Woodside

Epiphytic plants in the Bromeliaceae known as tank bromeliads essentially lack stems and absorptive roots and instead take up water from reservoirs formed by their overlapping leaf bases. For such plants, leaf hydraulic conductance is plant hydraulic conductance. Their simple strap-shaped leaves and parallel venation make them suitable for modeling leaf hydraulic conductance based on vasculatur...

Journal: :Journal of Visualization and Computer Animation 2006
Bedrich Benes Václav Tesínský Jan Hornys Sanjiv K. Bhatia

This paper presents a generalized solution to modelling hydraulic erosion using ideas from fluid mechanics. The model is based on the Navier–Stokes equations, which provide the dynamics of velocity and pressure. These equations form the basis for the model to balance erosion and deposition that determine changes in the layers between water and erosion material. The eroded material is captured a...

Journal: :Mathematical Social Sciences 2000
Marek M. Kaminski

The problem of distributing a single homogeneous divisible good among a variable set of agents, or the ‘rationing problem,’ is analyzed. Examples of rationing include bankruptcy, taxation, claims settlement, cost allocation, surplus sharing, and social choice problems. Agents are described by their personal characteristics, or types. A type may be an agent’s utility function, ]] preference orde...

Journal: :caspian journal of environmental sciences 2005
s. chandra h.c. joshi h. pathak

irrigation with distillery effluent, besides influencing crop yield, may have considerable impact on physical properties of soil because of its high salt and organic carbon contents. this experimental study was conducted to evaluate the effect of distillery effluent on hydraulic conductivity of a sandy loam alluvial soil and compare the effect of inorganic salts of potassium (k) with that of di...

2012
Ronald J. Adrian Ivan Marusic RONALD J. ADRIAN Ira A. Fulton

Wall-bounded turbulence manifests itself in a broad range of applications, not least in hydraulic systems. Here, we briefly review the significant advances over the past few decades in the fundamental study of wall turbulence over smooth and rough surfaces, with an emphasis on coherent structures and their role at high Reynolds numbers. We attempt to relate these findings to parallel efforts in...

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