57 results about "Critical depth" patented technology

An interconnect comprises a trench and a number of metal layers above the trench. The trench has a depth and a width. The depth is greater than a critical depth, and the number of metal layers is a function of the width. In an alternate embodiment, a metallization structure having a trench including a metal layer and a second trench including a plurality of metal layers coupled to the metal layer is disclosed. The metal layer is highly conductive, and at least one of the plurality of metal layers is a metal layer that is capable of being reliably wire-bonded to a gold wire. The trench is narrower than the second trench, and at least one of the plurality of metal layers is copper or a copper alloy.

The invention discloses a method for simultaneously determining a pile position and a critical depth of an anti-slide pile by using displacement monitoring, which is applicable to determining and designing the pile position and the critical depth of the anti-slide pile on an accumulated layer landslide. The method comprises the following steps of: (1) performing investigation, analysis and evaluation aiming at the geology of a side slope to be managed to determine a landslide body region; (2) dividing grids on the landslide body and selecting a displacement monitoring point position; (3) monitoring equipment mounting and displacement monitoring; (4) determining a synthetic total displacement value S (i, j) and vertical displacement direction rate of each monitoring point of landslide displacement; (5) determining landslide instability property and an anti-slide pile space reinforcement position; (6) determining the critical depth of a shearing slip band of the landslide body; (7) determining the pile length of the anti-slide pile of the landslide; and (8) performing information construction of the anti-slide pile. The method has the advantages of less investment cost, reliable design principle, high position determination accuracy, easiness, convenience, fastness, easiness in implementation and strong engineering applicability.

A reliable acoustic path-based deep sea earthquake sound parameter inversion method of the present invention comprises the steps of firstly arranging a single hydrophone nearby the seabed below a deepsea critical depth, enabling a ship to sail only in a survey sea area, at the same time, emitting a sound source signal, and acquiring the deep sea experiment data; using a receiving hydrophone to obtain a multi-path signal nearby the seabed below the critical depth by utilizing a sound source target, analyzing and extracting the multi-path information of a direct wave and a seabed reflected wave, calculating the seabed reflection loss changing along with the grazing angles, and finally matching the seabed reflection loss simulated by a model, and inverting to obtain a seabed parameter. Compared with the prior art, the deep sea earthquake sound parameter inversion method has the superiority of not needing a large aperture array and being convenient to arrange. By utilizing a stable physical phenomenon that the interference occurs between the layers at the seabed at different frequencies, and by the experiment data processing and the seabed modeling and simulation, the seabed earthquake sound parameter of a large depth sea area is obtained by inverting, the signal to noise ratio of the experiment data obtained in the present invention is high, and the robustness of the inversion method is good.

A tread depth measuring system includes a tread measuring apparatus, a processor, a supporter, and a warning apparatus. The tread measuring apparatus is positioned on the ground and configured to measure a tread depth. The processor is coupled to the tread measuring apparatus and configured to compare the tread depth measured by the tread measuring apparatus with a preset critical depth. The supporter stands on the ground. The warning apparatus is supported by the supporter and coupled to the processor. When the tread depth measured by the tread measuring apparatus is less than the preset critical depth, the processor sends a control signal to actuate the warning apparatus.

The invention relates to an active positioning method based on a reliable sound path and target multipath echo. For solving disadvantages of a passive detection method based on a reliable sound path, a single base active sonar is proposed to arrange under the critical depth, the reliable sound path is utilized to irradiate a target, the target multipath echo is further acquired, and the final target positioning result is acquired. The method is advantaged in that the basic principle and an enforcement scheme are verified through computer value simulation, as proved by the result, effective target positioning in the deep sea environment can be realized.

The invention relates to a rain-induced landslide critical start-up rainfall and instability early-warning time determination method, which comprises the following steps: Step 1, determination of physical and mechanical property parameters of a slope and slope angle and slope vertical depth; Step 2, monitoring of landslide slope rainfall and monitoring data processing; Step 3, determination of landslide start-up groundwater level critical depth value; Step 4, determination of landslide start-up effective rainfall threshold; Step 5, determination of real-time critical start-up rainfall of the slope; Step 6, slope stability analysis and evaluation; and Step 7, determination of slope instability early-warning time. The invention creatively puts forward a landslide stability real-time start-up rainfall determination and slope stability evaluation method based on a limit equilibrium method and with the combination of real-time rainfall monitoring. By real-time monitoring of rainfall, slope critical start-up rainfall can be detected and determined. The method has important application prospect and value in landslide hazard monitoring early-warning and stability evaluation.

The invention relates to an active target echo arrival time delay and arrival angle positioning method based on a reliable sound path. According to the method, a single emission energy transducer and one multi-element reception array which form a single base sonar arranged below the critical depth are employed, and the single emission energy transducer emits pulse signals and irradiates a target; a target echo of the target is acquired by the reception array, echo arrival time delay and an arrival angle of the emission energy transducer-target-reception array path are determined, through offline calculation, the nonstop wave arrival time delay and the nonstop wave arrival angle are acquired and are matched with actually-acquired nonstop wave arrival time delay and an actually-acquired nonstop wave arrival angle to acquire the target positioning result.

The invention relates to a soil salinization critical groundwater depth calculation method. The method comprises the steps that a soil type is determined; soil texture is determined; a soil capillaryequivalent pore diameter is calculated; a temperature range is determined; surface tension of water is determined; a salinization critical value is determined; and critical depth is calculated. According to the method, by analyzing the principle that salt is brought to the surface under the action of groundwater capillaries, the soil salinization process is elaborated, and the critical depth causing soil salinization is defined; and a calculation function of a key parameter, namely the soil equivalent pore diameter, in a rise height theoretical formula of capillary water is derived, the maximum rise height of the capillary water is used as a calculation objective, and a salinization model is constructed to determine the soil salinization groundwater critical depth. The method is clear in physical process and action mechanism, has universality for solving the soil salinization problem caused by excessively high groundwater and provides reliable theoretical and technical support for guiding reasonable development and utilization of groundwater resources and governance of soil salinization.

The invention relates to the side slope stability prevention technology, in particular to an infinite equal thickness complete water filling side slope anti-slip retaining wall soil pressure determining method. The double-layer slippage side slope anti-slip retaining wall soil pressure determining method includes the following steps: (1) determination of side slope body geometric elements; (2) determination of side slope body physical and mechanics parameters; (3) judging of whether the slope body slides along a bed rock face; (4) determination of side slope body plasticity sliding face critical depth; (5) determination of a safety coefficient FS; and (6) determination of anti-slip retaining wall soil pressure. The method is applied to a gently-inclined equal-thickness complete water filling side slope, wherein the ratio of the length to the thickness is not smaller than 5, a slope angle is not larger than 30 degrees, and anti-slip retaining wall back stands on the smooth slope body vertically. By means of the side slope geometric elements and slope body physical and mechanics parameters, the side slope body plasticity sliding face critical depth is calculated and determined, and a side slope sliding unstable type is judged. Action points, action forms and intensity of the anti-slip retaining wall soil pressure are determined according to the sliding unstable type.

The invention discloses an oxygen therapy device for agriculture, in particular to an automatic oxygen therapy crop waterlogging reduction device based on farmland water level. The automatic oxygen therapy crop waterlogging reduction device based on the farmland water level comprises an oxygen bottle, a water level monitoring device, a first automatic controlling valve and an underground pipeline device. The water level monitoring device is arranged underground, the first automatic controlling valve is arranged at the outlet end of the underground pipeline device, the water level monitoring device is connected with the automatic controlling valve, and the oxygen bottle is connected with the underground pipeline device. The water level sensing portion of the water level monitoring device is arranged near the upper portion of the underground critical depth of water, when a preset oxygen supplying condition is met, redundant water inside the pipeline is discharged, oxygen is transmitted to the root zones of crops automatically, the whole discharge pipeline is aerated, and the oxygen is dispersed to around root zones of the crops through holes on the discharge pipe. The automatic oxygen therapy crop waterlogging reduction device is capable of supplementing oxygen at the root zones of the crops to reduce the stress of waterlogging of crops, recovering vitality of the root zone of the crops, fully-automatic during the whole process of working, and beneficial for popularization.

The invention discloses a brittle material plastic deformation-fracture transformation critical depth and critical load detecting method based on a nanometer cut-in instrument. The method comprises the steps that the radius of a brittle fracture area is obtained based on a nanometer cut-in fracture test, and a relation curve of the radius of a fracture area in the brittle fracture stage and the press-in depth is obtained in a fitting mode through a press-in fracture theory; the curve is intersected with a relation curve of the radius of a plastic area in the plastic deformation stage and the press-in depth, and the true plastic deformation-fracture transformation critical depth is obtained; the plastic deformation-fracture transformation critical load is obtained based on the relation among the load, depth and displacement recorded by the nanometer cut-in instrument in real time. The brittle material plastic deformation-fracture transformation critical depth and critical load detecting method combines the nanometer cut-in fracture test and the press-in fracture theory, and is high in precision and good in reliability.

The invention relates to a single ring array active three-dimensional positioning method applied in a deep sea environment. A single-base active sonar formed by a single transmitting transducer and amultiple ring array is arranged below the critical depth; a target is irradiated by means of a reliable acoustic path, and the echo arrival delay, a horizontal orientation-absolute distance two-dimensional graph and an interference fringe pattern of an underwater target or interference are obtained by means of a ring array horizontal beam output; information including the horizontal distance and the depth of a bright point is obtained by means of a horizontal distance-depth two-dimensional matching mode; and the underwater target and the water surface interference are judged by means of the depth, the underwater target is finally screened out, and a three-dimensional positioning result is provided, that is to say, information including the horizontal angle, the horizontal distance and thedepth of the underwater target is provided.

The invention relates to a coastal greenbelt salt and alkali elimination construction process. The process includes steps: S10, original oil excavation; S20, blind ditch excavation; S30, salt elimination well construction; S40, blind ditch paving; S50, isolating layer paving; S60, salt and alkali elimination leaching layer paving; S70, planting soil backfilling. The process has advantages that according to a water-salt movement law that the salt comes along with water, goes away along with water, ascends along with water and descends with water, saline-alkali soil can be improved by paving ofa salt and alkali elimination leaching layer and laying of coarse sand and salt elimination pipes; in the rainy season, salt in soil flows into the salt elimination pipes along with water in rainfall,and salt ascending along with water in water evaporation in the dry season can be prevented through gravel grass mats and the like, so that alkali returning of discharged saline-alkali water due to water level rise can be effectively prevented, salt-containing underground water is prevented from ascending along capillary gaps of soil, the underground water is controlled below a critical depth, and soil salt elimination and salt returning prevention are realized.

The invention discloses an ultimate uplift capacity standard value calculation method for uplift short piles with enlarged bottom, and belongs to the field of uplift pile foundation. The method comprises the steps that 1, a second destruction mode of uplift short piles with enlarged bottom is determined when a foundation depth is greater than an uplift critical depth, and the shape of a sliding rupture surface and the composition of uplift capacity are analyzed; 2, calculation shear plane of the ultimate uplift capacity of soil is established; 3, a stress state equation of the sliding rupturesurface in an uplift limit equilibrium state of uplift piles with enlarged bottom is deduced according to the theory of sliding line and the Mohr-Coulomb yield criterion; 4, an ultimate uplift capacity standard value formula for an uplift pile foundation with enlarged bottom is deduced. According to the method, an uplift destruction mode of the uplift short piles with the enlarged bottom is clarified, and the ultimate uplift capacity standard value calculation method for the uplift short piles with enlarged bottom is deduced theoretically.

The invention discloses a determining method for design parameters of a deep-layer horizontal waterproof curtain of a foundation pit of a strongly permeable stratum. The determining method comprises the following steps: establishing a deep-layer horizontal waterproof curtain mechanical analysis model; separately calculating to obtain critical depths under four failure forms such as 'pull crack failure', 'compression shear failure', 'contact failure' and 'rigidity failure' of the deep-layer horizontal waterproof curtain; drawing a curvilinear relationship between the critical depth hcr and thethickness h0 of the deep-layer horizontal waterproof curtain of the foundation pit of the strongly permeable stratum, further comparing the critical depths of the deep-layer horizontal waterproof curtain under the four different 'failure forms', and selecting the maximum values of the four critical depths as a critical depth design value of the deep-layer horizontal waterproof curtain; and drawinga relation curve between the critical depth of the deep-layer horizontal waterproof curtain under different safety factors and the thickness of the horizontal waterproof curtain so as to obtain the optimal deep-layer horizontal waterproof curtain design parameters which meet requirements of safety factors. The obtained designed parameters are reasonable and reliable, and construction safety of the foundation pit of the strongly permeable stratum is ensured.

The invention discloses a method for judging the depth and shallow burying of a tunnel with a small clear distance based on a continuous surrounding rock pressure, belonging to the technical field oftunnel surrounding rock. The method combines the existing calculation formula of the small clear distance tunnel depth and shallow burying surrounding rock pressure, and then obtains the determinationmethod of the small clear distance tunnel depth and shallow burying based on the continuity of the surrounding rock pressure by analyzing the influence rule of buried depth to the small clear distance tunnel surrounding rock pressure. Based on the surrounding rock pressure of a shallow buried single tunnel, the surrounding rock pressure model of the shallow buried small clear distance tunnel considering the double-tunnel construction process is established. Based on the calculation model of the surrounding rock pressure of deep-buried small clear distance tunnel, the influence of the double-tunnel clear distance on the action mode of the surrounding rock pressure is considered, the action mode of the surrounding rock pressure is divided into three cases: no influence on left and right tunnels, weak influence and strong influence. The method sums up the calculation method of the surrounding rock pressure under the condition of small clear distance tunnel depth and shallow burying, andanalyzes the influence rules of tunnel geometry size, surrounding rock condition and clear distance between left and right tunnels on the critical depth burying.

The invention presents a non-invasive method and device of measuring the real-time continuous pressure of fluid fluctuating in an elastic tube and the dynamic compliance of the elastic tube, in which the theory of VLDT (Vascular Loading Decoupling Technique) is used. After searching the initial critical depth and determining the decoupled ratio, a DC controller generates a DC control gain to maintain the elastic tube at critical depth, and an AC controller employs the self-adaptive and Step-Hold control rules to create the pulsation of elastic tube without effect of surrounding tissues, and be capable of measuring the real-time continuous fluid pressure and dynamic compliance of elastic tube.

The invention relates to a single-base active sonar low-calculation three-dimensional positioning method for a deep sea environment. A single-base active sonar composed of a single transmitting transducer and a multi-element receiving array is arranged below a critical depth; a target is irradiated by using a reliable acoustic path, and an echo arrival time delay of the underwater target or interference, a horizontal orientation-absolute distance two-dimensional graph and interference fringes are obtained by utilizing horizontal wave beam output of the multi-element array; in a mode of performing one-dimensional search on multiple offline calculated horizontal distance-depth fuzzy curves by utilizing the echo time delay and performing fringe frequency one-dimensional matching along horizontal distance-depth fuzzy dotted lines, a horizontal distance and depth information of bright spots are obtained; the underwater target and the water surface interference are judged by utilizing the depth; and the underwater target is screened out, and a three-dimensional positioning result is given, namely, a horizontal angle, a horizontal distance and depth information of the underwater target are given. By utilizing the method for performing active positioning by utilizing the single-base sonar in the deep sea environment provided by the invention, the underwater target can be subjected to three-dimensional positioning by using a relatively small calculation amount.

A method of measuring the instantaneous arterial blood pressure and compliance and the device thereof are disclosed. The method identifies a critical depth under the skin. At this critical position, the arterial mean blood pressure is equivalent to the mean blood pressure obtained on the skin. The variation in the arterial mean blood pressure is tracked and controlled to maintain the equivalence between the mean blood pressure measured on the skin and the arterial mean blood pressure. In this case, the compliance of the muscle tissues remains invariant. Therefore, the variation measured on the skin is simply the behavior of the blood vessel. Using the skin-artery correlation, the invention can obtain the instantaneous blood pressure after some computation and the dynamic compliance at the critical position.