65 results about "Limit analysis" patented technology

The invention relates to a lower-bound limit analysis method of bearing capacity considering rock translation and rotation effects at the same time, and belongs to the technical field of rock slope stability analysis. According to the method, a rigid block unit is scattered as a geometry system of a rigid rock and a structural plane, the normal force, shearing force and bending moment of the structural plane are used as unknown quantities, a static permission stress field satisfying an equilibrium equation considering the translation and rotation effects of the rigid block unit, structural plane shear yield conditions, structural plane tensile yield conditions, structural plane rotational yield conditions and static boundary conditions is constructed, an overload coefficient is used as a target function, and a lower-bound linear mathematic programming model is built; the linear mathematic programming model is solved by means of an interior point algorithm, a strength reserve coefficient is solved by means of an iterative method at the same time, and the lower-bound solution and corresponding yield area of the overload coefficient or the strength reserve coefficient of the jointed rock slope are acquired. The method has the advantages that the concept is clear and the computational accuracy is high, and the method can be applicable to bearing capacity analysis of translational or rotational failure of the jointed rock slope.

The invention relates to a detection control method used in printing color, and aims to overcome the disadvantage that the prior printing reproduction effect detection method has limited analysis and measuring capabilities. The detection control method comprises the following steps: firstly, adopting CCD industrial color camera collection equipment to obtain a presswork color information RGB value; secondly, converting the RGB value into an Lab value corresponding to a CIELab space, and adopting a least square support vector machine method to realize transformation modeling from an Lab space to a CYMK space; converting the Lab value of a to-be-detected sample into a CYMK value of the CYMK space by a trained model to obtain the ink value of a corresponding ink area of a color presswork; and finally, comparing the ink amount value with a standard value to obtain an adjustment amount of the ink amount in the corresponding ink area. The detection control method not only measures color characteristics accurately, but also directs the adjustment in the amount of yellow, fuchsine, cyan and black ink during the printing, thereby solving the problem of effective and realizable monitoring of color reproduction effect in the color printing field.

The invention discloses a graph visualization system used for electric system load flow and stability analysis. The graph visualization system comprises a data processing module, a topological analysis module, a parameter modifying module, a graph displaying module and a software interface module. The data processing module is used for obtaining, storing and exporting network topological data, and a calculation file and the topological data are connected in a linkage mode. On the basis of data processing, the system sets the starting and halting states of equipment, and modifies parameters of the equipment through the topological analysis module and the parameter modifying module. Programs, provided by PSD-BPA software, for load flow calculation, stability calculation, N-1 analysis, small interference, short-circuit currents and fracture surface limit analysis are called through the software interface module. The graph displaying module is used for displaying a power grid topological structure, editing graph objects and displaying calculation result information. According to the system, power grid equipment parameters and mode data are adjusted on a graph sheet, the load flow and stability analysis is performed on the graph sheet, the management mode of text data is changed, and manufacturing efficiency of a power grid calculation mode is improved.

The invention discloses a quantification design method for preliminary bracing parameters of an unsymmetrical loading tunnel. The method comprises the following steps: the preliminary bracing parameters of the unsymmetrical loading tunnel are designed based on shearing resistance damage; the shearing resistance bracing resisting force during tunnel construction is completely borne by a preliminary bracing system; the shear slip force during the unsymmetrical loading tunnel construction is solved according to a limit analysis method; and the shearing resistance bracing resisting force of the preliminary bracing are obtained through stacking the shearing resistance bracing resisting forces provided by an anchor rod, spray concrete, steel frame, etc., which constitute the preliminary bracing system. The invention changes the present situation that at present the design of the preliminary bracing parameters of the unsymmetrical loading tunnel relies on experience for a long time, and realizes the quantification design of the tunnel preliminary bracing parameters.

The invention provides a method for determining a workflow participant based on data permission. The method includes steps of firstly, setting authorization permission relevant to processes which are possessed by a user while a permission setting management module maintains data permission of a service object; then setting required authorization permission on each examine and approve activity in a workflow definition, when a workflow runs as a living example, dynamically calling a port method which is provided by a limit analysis module and enabling a user who obtains an authorization permission limit which is set on a current examine and approve activity to be the participant to conduct task allocation through a workflow engine; and judging whether the current user has the examine and approve authority limit and relevant data authority of a service invoice to be examined and approved or not through a task to be done of a workflow management system according to the authorization permission limit defined on the current examine and approve activity. The method makes the best of service which is provided by a permission management system, effectively solves the problem that the participant in the workflow management system is hard to set and maintain, and meanwhile meets requirements of the workflow management system for conducting data authority control on service data visiting of the participant.

The invention relates to the technical field of grid control and specifically relates to a control method of a grid closed loop operation impact current. The control method includes the following steps that a closed loop operation switch and a system display interface are arranged according to real-time grid operation data section, and a recording way is provided; a dispatcher records a line protection current setting value, and system checking is performed; if a reasonable loop can not be searched, the fact that a loop closed way is unreasonable is prompted, and resetting is performed; if reasonable loop information can be searched, phase checking is performed, unreasonable reasons are prompted if the checking doesn't pass, loop closed topological information and display are observed if the checking passes, and then click calculation is performed; admittance matrixes are used to obtain loop closed port impedance, initial tidal current of online grid data is calculated, injection volumes of loop closing points are revised, whole net tidal current calculation is performed after loop closing, and off-limit analysis of a whole net is performed after the loop closing; risk information is prompted; and results of topological information are displayed. According to the control method, risks can be effectively reduced, and small loop closing impact current can be guaranteed.

The invention discloses a soil landslide monitoring, early warning and evaluating method which comprises the following steps: S1, acquiring landslide topography and geological data to be monitored, and acquiring a rock-soil parameter test value through an indoor test; S2, establishing a landslide geologic model, carrying out limit analysis, determining a landslide damage mode and carrying out landslide monitoring; S3, uniformly designing parameter combinations for the rock-soil parameter test values, performing finite element calculation on all the parameter combinations to obtain a displacement field calculated by each parameter combination, and recording the displacement of each monitoring point to obtain a 'parameter combination-displacement' neural network model; S4, according to the landslide real-time cumulative displacement monitoring data and the parameter combination-displacement neural network model, performing rock-soil parameter inversion correction, obtaining rock-soil real-time strength parameters, and performing precision inspection; and S5, performing limit analysis by adopting real-time strength parameters, establishing a 'real-time cumulative displacement-safety coefficient' relation curve, establishing a landslide monitoring three-level early warning grade evaluation system, and evaluating the monitored landslide.

Techniques are disclosed relating to limiting malicious-code analysis of webpage content. In one embodiment, a computing system receives a webpage requested by a client device. The computing system randomly alters content of the webpage to limit analysis of the content by malicious code such that the altering does not affect how the webpage is displayed by the client device. The computing system may then serve the webpage with the altered content to the client device. In some embodiments, the altering includes searching the webpage for an HTML element that specifies a plurality of attributes in a particular ordering and rearranging the plurality of attributes to have a new ordering different from the particular ordering. In some embodiments, the altering includes parsing the webpage for an HTML element that specifies an identifier attribute and modifying an identifier attribute of the element.

The invention discloses a novel marine soil full-flow penetration sounding system and a test method, and belongs to the field of civil engineering. An oval-cross-section probe with an axial length ratio of 0.4 is adopted to further reduce a test error caused by the probe resistance coefficient, and linear relationships between the probe resistance coefficient, a resistance coefficient error and the axial length ratio is given; fiber bragg gratings are arranged on the outer wall of a probe rod to replace a traditional pressure sensor, the resistance of the end part of the probe and the lateralfriction resistance are tested in the cyclic penetration process; an algorithm of soil body undrained shear strength is given theoretically by using a limit analysis method of soil plasticity mechanics based on a full-flow theory, and a corresponding algorithm is given by combining a geometric form ratio of the probe and the probe rod; and a hole pressure sensor is arranged at the oval probe to test changes of hole pressure in the penetration process. Compared with existing test technologies, measurement errors caused by the difficult control over the probe resistance coefficient is reduced, the test method of the undrained shear strength of marine soft soil is optimized, and the accurate measurement of the shearing strength of the marine soft soil can be realized.

An electronic template delineating distinct selected patterns corresponding to predetermined regions of interest in a sample part is used to limit analysis to those regions. The surface of the sample is first measured using conventional techniques. The data so acquired are used to identify boundaries between distinct regions, which are then compared to a predetermined pattern boundary in the template to find a best-fit match. The position of the pattern is then shifted to overlay the match, thereby automatically aligning the template's selected patterns with the regions of interest in the sample surface. As a result, profilometric analysis can be limited to the regions of interest. Correction factors are also assigned to each selected pattern in the template to account for physical differences in the corresponding regions of interest of the sample part that affect the profilometric measurement.

The invention discloses a method for calculating the effective anchoring length of a non-prestressed anchor cable of a rock slope. Firstly, a rock mass failure body model around a non-prestressed anchor cable grouting body is established. The velocity field around the grouted rock mass is established, and the energy loss and external force power in the slip plane are deduced. According to the reciprocal theorem of internal and external work, the calculation formula of the maximum pulling force that the anchor cable can bear is deduced. The stress distribution of rock failure surface element isestablished, and the maximum drawing force formula of anchor cable is deduced according to the equilibrium condition of the force. Combined with the formula of maximum drawing force deduced above, the formula of effective anchorage length of anchor cable is deduced. This method can be applied to complex and changeable rock geological conditions with uncertain engineering conditions. Based on theplastic mechanics limit analysis method, the mechanical model is established, and the load distribution law of rock mass around the anchor rod is obtained. The effective anchorage length of the anchorrod is deduced through the solution of the ultimate pullout force of the system anchor rod and the design is carried out.

The invention discloses a three-dimensional slope safety factor solving method based on lower bound limit analysis. According to the method, the magnitude, direction and action point of block body interface acting force serve as main variables, static balance (meeting force and torque balance at the same time) and yield criteria required by the lower bound limit analysis for permitting a static field serve as constraint conditions, and the slope stability analysis problem is converted into a nonlinear optimization problem for solving the maximum safety coefficient value; meanwhile, the accuracy and reliability of the calculation result of the method disclosed by the invention are verified through a representative example, and satisfactory results are obtained. The invention provides a newmeans for the three-dimensional stability analysis of the actual slope engineering.

The invention discloses a shallow-buried tunnel surrounding rock pressure calculation method in a secondary failure mode. The calculation method comprises the following steps of failure model construction, external force acting, internal force acting, limit equilibrium analysis and optimal solution of surrounding rock pressure. According to the method, a secondary failure mode after tunnel excavation is constructed on the basis of the limit upper limit analysis theory in combination with the actual situation of field construction, and on the basis, a surrounding rock pressure calculation formula is derived from the perspective of energy on the basis of the energy superposition principle and according to the shallow-buried tunnel failure internal mechanism process. Meanwhile, according to the limit upper limit analysis theory, the limit analysis solution is the optimal solution (the maximum value or the minimum value), the optimization theory is introduced, and the limit analysis solution is solved. The calculation method has a relatively complete theoretical basis and high calculation efficiency, and can further correct the surrounding rock pressure in combination with the actual measurement result of the field surrounding rock pressure to obtain a more accurate calculation solution.

The invention discloses a circular foundation pit stability analysis method based on a limit analysis upper limit theorem, belongs to the technical field of geotechnical foundation pit engineering stability analysis, takes a circular foundation pit as a research object, and comprises the following steps: according to the actual situation of the circular foundation pit, drawing up basic informationfor performing circular foundation pit stability; dispersing the circular foundation pit by adopting a triangular three-node plastic unit; generating a constraint control equation obeying a limit analysis upper limit theorem; establishing an upper limit finite element method mathematical optimization model for solving the stability of the circular foundation pit; performing numerical solution ofthe mathematical model of the circular foundation pit stability upper limit finite element method; and introducing a local grid adaptive encryption technology to automatically carry out local grid encryption on the damaged area. Compared with a traditional limit equilibrium analysis method, the method has higher calculation precision; compared with a finite element method, the method neglects theconstitutive relation of the material, so that the calculation speed and efficiency are higher.

Belonging to the technical field of small molecule metabolite analysis, the invention relates to an HPLC-TOF-MS/MS method for simultaneous determination of 10 nucleosides. The method specifically includes the steps of: mixing of 10 nucleosides to prepare solutions with different concentrations; HPLC-TOF-MS/MS analysis and identification of the10 nucleosides; HPLC-TOF-MS analysis and stability, precision, detection limit and quantification limit analysis of nucleoside mixed solutions with different solutions; drawing of a standard curve of the 10 nucleosides; HPLC-TOF-MS and HPLC-TOF-MS/MS analysis of biological samples; and qualitative and quantitative analysis of several specific nucleosides in the biological samples according to the HPLC-TOF-MS/MS data of each nucleoside and the standard curve. The method has the characteristics of rapid and simple analysis process, reliable detection result and high sensitivity, and is suitable for qualitative and quantitative analysis of nucleosides in blood samples, urine samples, saliva and other biological samples.

The invention relates to a method for calculating the base bearing capacity of a dump based on the limit upper limit method, belonging to the technical field of calculating and analyzing the base bearing capacity of a dump in open-pit mine engineering. The method for calculating the base bearing capacity of the dump based on the limit upper limit method comprises the following steps: Step 1, determining the physical and mechanical property parameters of the artificial piles and the base of the dump; 2, calculating the limit value of the bearing capacity of the foundation base according to theprinciple of the limit analysis upper limit method; 3, dividing that plastic zone into a plurality of soil strips with incline interface based on the principle of the limit analysis upper limit method, wherein each soil strip is regarded as a rigid body, and obtaining the basic equation of the limit analysis upper limit method for calculate the base bearing capacity of the dump; and Step 4, determining the limit load and the stability coefficient of the limit equilibrium. The method for calculating the base bearing capacity of the dump based on the limit upper limit method solves the technicalproblem that the accuracy of the analysis and measurement of the base bearing capacity is insufficient, the result is accurate, and the utilization space of the base bearing capacity of the dump is improved.

The invention discloses an arbitrary polyhedral wedge-shaped body safety factor solving method based on a limit analysis lower limit theorem. The method comprises the following steps: firstly, determining spatial geometrical characteristics of a wedge-shaped body and boundaries forming the wedge-shaped body, and generating a wedge-shaped body model; secondly, establishing a variable system based on the composition of the wedge boundary according to the characteristics of the limit analysis lower limit theorem and the characteristics of the wedge material; establishing a constraint equation according to basic conditions of a limit analysis lower limit theorem, and deducing an optimization algorithm expression of a wedge limit analysis lower limit solution; and finally, through an optimization algorithm expression, solving the wedge-shaped body safety coefficient, and evaluating the wedge-shaped body stability. According to the limit analysis lower limit theorem, no assumption is introduced, the optimal solution is obtained through the optimization method, and the safety and the stability of the wedge-shaped body are truly and objectively reflected. In addition, the method is not limited by the boundary shape and the number of the formed wedge bodies, has better applicability and can adapt to more complex wedge body stability analysis problems.

The invention relates to a service access flow control method and device, a server and a storage medium, which are applied to the server. The method comprises the following steps: receiving an accessrequest; Acquiring state feature information of a service corresponding to the access request; Taking the access request and the state feature information as input of a current-limiting analysis model; Wherein the flow-limiting analysis model is obtained through unsupervised learning and supervised learning combined training, and the output of the flow-limiting analysis model is that whether the state of the service conforms to a flow-limiting condition or not; Obtaining the output of the current-limiting analysis model, and starting/disabling a current-limiting mechanism corresponding to theservice according to the output; And when the current limiting mechanism corresponding to the service is in the starting state, refusing the access request, and when the current limiting mechanism corresponding to the service is in the forbidden state, responding to the access request. According to the embodiment of the invention, the problem of insufficient flexibility/adaptability of the existing service access flow limiting scheme is solved, and the normal availability of the service is effectively ensured.

A sample is analyzed for trace amounts of protein by dot blotting and subsequent fluorescence staining. According to this method, trace amounts of proteins such as an allergen in a food, a drink, a food additive, a medicament and feed etc. can be simply analyzed with high sensitivity. By providing the objective analysis method as described above, quantitative analysis and limit analysis of a protein contained in a sample can be performed.

The invention provides a department limit analysis system and method with exponential decay as a model. The system comprises an electronic medical record system, a hospital information system, an assessment module and a hospital office system. The assessment module conducts analysis according to data of a medical statistics system, the basic limit and the per capita limit of each department are obtained through an allocation algorithm, and then the basic limits and the per capita limits are fed back to a patient in-hospital charging system and the hospital office system. The department limit analysis system and method improve the informatization level and assessment capacity of hospitals, and can effectively inhibit the problems of excessive medical treatment and department payment uneven distribution.

The invention relates to a method for testing mechanical property of an uplift pile under a deep excavation condition. The method comprises the following steps: (1) building a vertical tension mechanical model of a base-enlarged uplift pile by utilizing a numerical value analysis method, a centrifugal model test, a limit equilibrium method and a limit analysis method; (2) acquiring failure mechanism and load bearing characteristics of a uniform-section uplift pile and the base-enlarged uplift pile, and uplift bearing capability loss characteristics of the piles under excavation unloading based on the centrifugal model test and numerical simulation; (3) proposing three calculation methods of bearing loss of the uplift pile under a predicted deep excavation condition; and (4) determining a critical failure surface by utilizing an improved Monte-Carlo search technique, building a multi-block upper limit analysis method for a limit bearing capability of a base-enlarged uplift pile to obtain data of the mechanical property of the uplift pile under the deep excavation condition. Compared with the prior art, the method for testing the mechanical property of the uplift pile under the deep excavation condition, disclosed by the invention, has the following advantages of optimizing design and construction schemes, saving engineering investment, improving an analysis theory of the uplift pile and the like.