10 results about "Hydraulic conductance" patented technology

The invention belongs to the technical field of plant leaf hydraulic characteristic determination, and discloses a corn leaf hydraulic conductivity and embolism curve determination system and method, and the system comprises a corn leaf transpiration amount determination device in a stable state; the invention discloses a convenient leaf water potential balance, dehydration and leaf area measuring device and a dew-point water potential instrument, and the measuring system and method are not only suitable for measuring the maximum hydraulic conductance and embolism curve of the leaf in the whole growth period of corn, but also can realize the goal of simultaneously measuring the maximum hydraulic conductance and complete embolism curve of the corn leaf by using only one corn leaf. According to the method, blade mechanical damage caused by heterogeneity of blades at different positions and a pressure chamber method is avoided, and the measured maximum hydraulic conductivity and embolism curve fitting effect is better.

Disclosed are geotextiles configured for moisture management. In exemplary embodiments, a geotextile comprises a plurality of structural elements including one or more yarns, cords, or filament bundles arranged to form a fabric or grid. At least a portion of the structural elements include capillary-active surfaces and / or are configured to promote capillary wicking of moisture along at least one direction of the geotextile. At least a portion of the structural elements include internal void regions configured to maintain hydraulic conductivity under compaction. The geotextile is operable for providing dual-mode moisture transport through both capillary wicking and hydraulic flow thereby allowing for removal and redistribution of water from pavement layers and subgrade soils.

The invention discloses a cotton boll water flux balance equation and a phloem hydraulic conductivity quantification method, and relates to the technical field of plant physiology and agricultural engineering. The method comprises the following steps: measuring the water vapor diffusion conductance of the fruit surface and the hydraulic conductance of the fruit xylem, monitoring the fresh weight and dry weight change of the fruit and the daily change of the water potential of the fruit and the stem, establishing a water flux balance equation of entering and exiting the fruit, and calculating the hydraulic conductance of the phloem. Parameters such as related conductance and osmotic potential are calculated through a formula, the phloem water flux is calculated according to a fruit phloem sugar unloading path selection formula, and then the phloem hydraulic conductance is obtained. The method solves the problem that a systematic quantification method for phloem hydraulic conductivity is lacked in the prior art, can accurately track the moisture flux of the fruits, provides a basis for crop stress-resistant variety breeding and accurate irrigation, and is suitable for fruit crops such as cotton and the like.

The invention relates to the technical field of loess structural attenuation monitoring equipment in geotechnical engineering, in particular to hydraulic conductivity testing equipment for loess structural attenuation monitoring and an application method thereof, and the hydraulic conductivity testing equipment comprises a drill rod, a probe, a low water head adjusting unit, a time domain reflectometer sensor, a vibrating wire pressure gauge, a flow sensor, a data acquisition instrument and a power device; a filter screen assembly of a three-layer composite structure is installed in the probe, a low water head adjusting unit, a time domain reflectometer sensor and a vibrating wire pressure gauge are sequentially connected above the filter screen assembly, a drill rod is connected between the vibrating wire pressure gauge and a power device, and a flow sensor, a data acquisition instrument and a water source are arranged above the ground. Through multi-parameter collaborative analysis, the structural attenuation state of the loess can be monitored in real time, the problems that fine particles block a filter screen, unsaturated loess is not matched, and structural dynamic changes are difficult to capture are effectively solved, and the method has the advantages of being high in monitoring precision, resistant to alkaline corrosion, easy and convenient to operate and the like and is good in engineering application prospect.

A self-hardening slurry and method is provided that can be used to prepare geotechnical construction materials with suitable properties so as to be useful in the construction of underground water cutoffs and other water barriers designed to achieve the required hydraulic conductivity, e.g., about 10−6 or 10−7 cm per second. The slurry composition of the present disclosure relates to a dry mixture that is added to water to provide a self-hardening slurry (SHS) composition that obtains a significant reduction in the amount of Portland cement (or OPC). The SHS is formed using high-silica materials to replace significant amounts of OPC which will lower overall costs and be more acceptable under regulations governing such structures. The slurry composition can be used to form products like slurry walls that will provide advantageous engineering properties with regard to strength and hydraulic conductivity or permeability at lower cost.

The invention discloses a power transmission line corridor vegetation refined management method and device based on hyperspectral remote sensing and a medium, and belongs to the technical field of power transmission line corridor vegetation management.The method comprises the steps that a target tree actually-measured water potential field and a reference plant actually-measured water potential field are inverted; the hydraulic conductivity of the xylem is estimated with the canopy power frequency electromagnetic excitation field gradient as an identifiable condition, and a statistical benchmark is established; solving a theoretical water potential field of the target tree; constructing a structural residual field, performing normalized Laplace processing, determining a catheter failure leading edge position and a catheter failure leading edge normal vector, and constructing a failure pointing index; and comparing and judging a threat direction according to the conduit failure leading edge normal vector, the electromagnetic excitation main direction included angle and the torque, and outputting a differentiation management instruction. According to the method, accurate positioning and failure pointing quantification of the failure leading edge of the sub-canopy scale conduit are achieved, and three types of differentiated management instructions including directional priority pruning, planned retest early warning and continuous monitoring are output.

Colloidal silica can be used in advanced techniques for environmental and geotechnical engineering, such as for groundwater control, mine water management, and the formation of in-situ containment structures. Colloidal silica can be used to immobilize groundwater plumes, manage mine water in high hydraulic conductivity areas, and construct in-situ cutoff walls and diversion structures.

A self-hardening slurry and method is provided that can be used to prepare geotechnical construction materials with suitable properties so as to be useful in the construction of underground water cutoffs and other water barriers designed to achieve the required hydraulic conductivity, e.g., about 10"6 or K?7 cm per second. The slurry composition of the present disclosure relates to a dry mixture that is added to water to provide a self-hardening slurry (SHS) composition that obtains a significant reduction in the amount of Portland cement (or OPC). The SHS is formed using high- silica materials to replace significant amounts of OPC which will lower overall costs and be more acceptable under regulations governing such structures. The slurry composition can be used to form products like slurry walls that will provide advantageous engineering properties with regard to strength and hydraulic conductivity or permeability at lower cost.

It has been confirmed that crushed shell drains constructed from crushed shells have less of a decline in drainage performance due to the inclusion of sand than gravel drains, and are therefore effective as liquefaction countermeasure drains.Furthermore, crushed shells have a lower dry density than crushed stone and are extremely lightweight, so their own weight in the ground improvement area is smaller, and the purpose of this study is to provide a system for suppressing ejecta and subsidence in liquefied ground, which has the effect of significantly reducing the amount of ground subsidence after liquefaction. [Solution] The present invention is a system for suppressing ejecta from the surface of improved ground and suppressing ground subsidence due to liquefaction during an earthquake in ground that has been improved by laying crushed shell drains.The system is characterized by selecting crushed shells with a hydraulic conductivity that will prevent the infiltration water pressure due to the excess pore water pressure difference of the crushed shell drain laid in the ground from becoming higher than the effective overburden pressure of the crushed shell drain after liquefaction, and laying crushed shell drains formed from the selected crushed shells to improve the ground.

To provide a water permeability coefficient parameter identification support method capable of determining a situation whether or not its hydraulic analysis model is better to be corrected.SOLUTION: A water permeability coefficient parameter identification support device and method comprises: determining whether or not difference between spring water amount gained from a result of a three-dimensional seepage flow analysis and observed data at a cut face position where the spring water amount is gained by carrying out the three-dimensional analysis based on a geological model and an analysis model near a tunnel by inputting the observed data including at least a measured result gained through measurement of the seepage amount generated in the cut face of the tunnel, at-site condition setting information including at least the cut face position representing an excavation section, and a hydraulic parameter including water permeability coefficient is within a first allowance referring the observed data; based on the determination result, when the difference is out of the first allowance, determining whether or not a period out of the first allowance exceeds a first management amount; and outputting a message representing correction of the geological model to be carried out when the first management amount is exceeded based on the result.SELECTED DRAWING: Figure 1