288 results about "Stability index" patented technology

A filter media comprising a nanofiber layer and a substrate layer; the nanofiber layer comprising a polymer material and having a fiber diameter of about 0.01 to 1.0 micron, a basis weight of about 0.5 to 30 gsm, and a thickness of at least about 2 microns, the nanofiber layer further having a surface stability index of at least about 5 kN/m, the media further being pleated.

The invention relates to a network security situation awareness method and system. The network security situation awareness method comprises the steps that key elements capable of being used for describing the network security situation are extracted, including network flow stability, threatening, vulnerability and user behaviors, second-level index score calculation and first-level index score calculation are carried out on the extracted key elements, first-level index scores include a network flow stability index score SS, a threatening index score TS, a vulnerability index score VS and a user behavior index score US, and finally the value of the entire network security situation is calculated by utilizing the weighted sum. The network security situation awareness method and system aim to establish comprehensive network security situation awareness indexes and improve the effectiveness and the real-time performance of the network security situation awareness.

A date palm seed-based lost circulation material (LCM) is provided. A date palm seed LCM may be manufactured by drying date palm seeds and grinding the dried date palm seeds to create a plurality of particles. The particles may have sizes less than 4 mm, from 1 mm to 2 mm, or from 2 mm to 4 mm. The date palm seed LCM may have a volumetric swelling greater than an LCM formed from tree nuts and may have a volumetric swelling of at least 0.3 cubic centimeters per gram. The date palm seed LCM may have a D50 shift factor less than an LCM formed from calcium carbonate and may have a D50 shift factor of at least 0.38%. The date palm seed LCM may have a stability index of at least 0.95. Methods of lost circulation control and manufacture of a date palm seed LCM are also provided.

A system (18) for controlling a safety system (44) of an automotive vehicle (10) includes a longitudinal acceleration sensor (36), a vehicle speed sensor (20), a lateral acceleration sensor (32), a yaw rate sensor, and a controller (26). The controller (26) determines a stability index and provides a first observer that determines a reference longitudinal velocity in response to the longitudinal acceleration signal, the yaw rate signal, a pitch attitude and vehicle speed from wheel speed sensors. The controller (26) determines a reference lateral velocity in response to the lateral acceleration signal, the yaw rate signal, a roll attitude, a pitch attitude and vehicle speed from the wheel speed sensors. The controller provides a second observer that determines a second longitudinal velocity in response to the longitudinal acceleration signal, the yaw rate signal, a lateral velocity, the pitch attitude and a first adjustment based on the longitudinal reference velocity. The controller determines a second lateral velocity in response to the lateral acceleration signal, the yaw rate signal, a roll attitude, a pitch attitude and a second adjustment based on the lateral reference velocity. The controller determines an output lateral velocity and an output longitudinal velocity in response to the first observer, second observer and the stability index. The controller controls the safety system in response to the output lateral velocity and the output longitudinal velocity.

A method of identifying voltage instability in a power system via identification of a weakest line and bus that contribute to the collapse of the system is provided. The method includes periodically calculating an extended line stability index for the transmission lines monitored in the power system; and using the extended line stability index to determine the distance of an operation state in the power system from a collapse point of the system caused by voltage instability.

The invention provides a server integration method oriented to minimum energy consumption. The server integration method oriented to minimum energy consumption includes that resource states and performance data of servers and virtual machines on the servers are periodically obtained, and meanwhile, energy consumption of the servers is periodically measured by an external-connected wattmeter on a physical server to be stored; resource state data of the servers, resource state data of the virtual machines, performance data of the servers and the performance data of the virtual machines are periodically collected, and data pre-processing is performed; a server energy consumption model is established; a virtual machine transfer cost prediction model is established; transfer cost prediction value of each virtual machine is obtained; virtual machine comprehensive assessment is performed by means of an improved analytic hierarchy process; service stability index of the servers is calculated; a server integration scheme is determined; server integration is performed. According to the server integration method oriented to minimum energy consumption, the virtual machines are transferred to proper servers by means of a dynamic packing algorithm according to virtual machine resource required quantity and server resource surplus, and the number of starting servers is the minimum under the condition of stable service operation.

Systems and methods detect respiration of a subject, process respiration data, and based on the processed respiration data, perform extended monitoring. A monitoring system is configured with sensors that can be worn by the subject to provide the respiration data. The respiration data is processes to create a stability index. The stability index is used to, for example, determine sleep stages.

The present invention relates to a particulate superabsorbent polymer composition comprising a polymer comprising a neutralized aluminum salt solution applied to the surface of a particulate superabsorbent polymer; wherein an aqueous solution of the neutralized aluminum salt has a pH value from about 5.5 to about 8 and the particulate superabsorbent polymer composition has a mean particle size distribution of from 300 to 400 μm, an original Free Swell Gel Bed Permeability (FSGBP) of about 20×10⁻⁸ cm² to about 200×10⁻⁸ cm²; and subsequent to subjecting the particulate superabsorbent polymer composition to the Processing Test, the particulate superabsorbent polymer composition has a permeability stability index of from about 0.60 to about 0.99 and having particles having a particle diameter of larger than 600 μm in an amount of less than about 15 wt % of the particulate superabsorbent polymer composition and as specified by standard sieve classification.

Lubricating oil compositions and viscosity index (VI) improver concentrates containing combinations of first polymers that are amorphous ethylene α-olefin copolymers; and second polymers that are star polymers, the arms of which are derived from diene, and optionally vinyl aromatic hydrocarbon monomer, wherein the star polymers have a Shear Stability Index (SSI) of from about 1% to about 35% (30 cycle).

The invention, which relates to the technical field of the integrated energy system, provides a stable evaluation and static control method for an electro-thermal-gas integrated energy system. The method comprises: S1, modeling is carried out on an electro-thermal-gas integrated energy system by means of combination of data driving and mechanism driving; S2, screening and correlation identification of abnormal data are carried out; S3, a stable evaluation method is implemented; to be specific, a calculation formula of a stability index is defined by taking power flow calculation of an energy flow and load reduction quantity and wind curtailment quantity calculation as priorities and using determination of exceeding the limit by the energy flow as an evaluation criterion and a system stability evaluation standard comparison table is provided; and S4, static control is carried out, so that a sub-system independent solution problem and a multi-system coordinated solution problem are solved. According to the invention, with the integrated energy system model established by combination of data driving and mechanism driving, prediction of the load changing situation and dual identification of abnormal data of the system are realized, so that stability evaluation and static controlling are carried out on the system accurately and reasonably.

The invention discloses a self-fitting digital temperature compensation crystal oscillistor and a system and a realization method thereof, which uses resources thereof, finishes the temperature compensation fitting process in an autonomous manner, thus ensuring the consistency of the product inner environment and production environment, improving the accuracy of the temperature compensation data and ensuring the frequency temperature stability precision. The fitting test process has the advantages of avoiding the whole-process control from computers, improving the production efficiency in each unit time and preventing the risks caused by abnormal peripheral or manual misoperation. In the invention, the temperature property index of the pilot production product is -40 DEG C to +85 DEG C, has better property with all being less than plus or minus 0.05ppm, exceeds 10-20 times than the like products, is higher than the frequency temperature stability index of three-level clock constant-temperature crystal oscillistor, and ensures the frequency temperature stability precision to get the optimal effect.

The invention discloses a MEMS (micro-electro-mechanical system) fully decoupled closed-loop gyroscope. The gyroscope comprises a substrate and a sensitive device layer, wherein an insulating layer isarranged between the substrate and the sensitive device layer; the sensitive device layer comprises a first substructure, a second substructure and a coupling connection beam; each of the first substructure and the second substructure comprises a driving frame, driving folding beams, driving decoupling beams, a Coriolis mass block, a detection frame, detection beams, detection decoupling beams, driving fixed comb teeth, driving movable comb teeth, driving detection fixed comb teeth, driving detection movable comb teeth, detection fixed comb teeth, detection movable comb teeth, force feedbackfixed comb teeth, force feedback movable comb teeth and anchor points. Generation of quadrature error signals is suppressed, and the zero bias stability index of the MEMS gyroscope is improved; the gyroscope has compact structure and small chip area, and can prevent a detection-mode sensitive mass from twisting due to larger displacement, thereby having good overall linearity and high measurementaccuracy.

The invention relates to a low-temperature drafting production process for high-modulus and low-shrinkage polyester industrial yarn, and belongs to the technical field of polyester industrial yarn manufacturing. According to the process, firstly, amorphous-form polyester chips are tackified through solid phase polycondensation, high-viscosity polyester chips are obtained, and then the high-modulus and low-shrinkage polyester industrial yarn product is obtained through melt spinning and drafting winding. After the high-modulus and low-shrinkage polyester industrial yarn is subjected to thread twisting and cloth weaving secondary-bath gum dipping, the brute force maintaining rate of rubberized cords of the high-modulus and low-shrinkage polyester industrial yarn is larger than 100% relative to the brute force of cord threads after the wire twisting, and the stability index of the size of the gum dipping core threads is smaller than 6.0%. According to the process, the brute force maintaining rate and the size stability index of the rubberized cords of the high-modulus and low-shrinkage polyester industrial yarn are superior to those of spinning drafting products produced with a conventional high-temperature drafting process. According to the process, in the spinning process, due to the fact that the temperature of a hot roller is low, energy consumption is saved.

The invention discloses an automatic stability detecting method for the process of CO2 electric arc welding short circuit transition welding, which comprises the following steps: collecting the arc voltage value and the welding current value in the CO2 electric arc welding short circuit transition welding process, and storing the arc voltage value and the welding current value as a signal sample; performing cycle phase judgment to the voltage value of each signal point in the signal sample; counting the short circuit time in the signal sample, computing and obtaining the frequency distribution value of short circuit time through segmenting 5-10,000 inter-cells; setting 3-1,000 frequency distribution accumulation values, and detecting the time range meeting each frequency distribution accumulation value; getting normal distribution standard deviation, so as to obtain and take the average value of the peak value of a normality probability density function as the stability index in the CO2 electric arc welding short circuit transition welding process; sending an alarm signal when the stability index is smaller than the stability threshold value. The stability detecting method provided by the invention has the characteristics of objectification and quantification, can be realized by adopting a testing platform with a simple structure only, and has strong practicability.

The present invention provides a linear active disturbance rejection control (ADRC) design and parameter tuning of aircraft pitch attitude. The linear active disturbance rejection control (ADRC) design and parameter comprises the steps of (1) establishing direct and indirect influence relations which describe an elevator influence pitch angle directly for a pitch nonlinear kinetic equation, (2) for the pitch channel kinetic equation obtained in the step (1), taking all indirect influence items as disturbance, designing a linear expansion state observer, estimating and compensating a linear expansion state observer, and using a simple PD control strategy for a compensated system, (3) using a small perturbation hypothesis principle to carry out linearization to obtain a kinetic coefficient for the nonlinear equation obtained in the step (1), (4) carrying out graphical tuning of a control parameter according to a robust stability index and a dynamic performance index. According to the method, on the basis of ensuring the stable robustness and good dynamic quality of a controller, the form is very simple, at the same time, the pattern parameter tuning method based on a stable margin test factor has a visual characteristic, and the blindness of parameter debugging is avoided.

A new soft stainless steel plate has an austenite stability index Md30 controlled in the range of -120 to -10 and a stacking fault formability index SFI controlled at not less than 30, and contains a Cu concentration controlled at Precipitation not greater than 1.0% is used to maintain the dissolved Cu concentration at 1-5%. The stainless steel plate preferably contains up to 0.06% (C+N), up to 2.0% Si, up to 5% Mn, 15-20% Cr, 5-9% Ni, 1.0-4.0% Cu, up to 0.003% Al, up to 0.005% S and optionally up to 0.5% Ti, up to 0.5% Nb, up to 0.5% Zr, up to 0.5% V, up to 3.0% One or more of Mo, up to 0.03% B, up to 0.02% REM (rare earth metal) and up to 0.03% Ca. The stainless steel plate can be plastically deformed into the intended shape by multi-stage deep rolling or compression deformation, and there is no crack even in the severe processing part. Md30(℃)=551-462(C+N)-9.2Si-8.1Mn-29(Ni+Cu)-13.7Cr-18.5MoSFI(mJ/m2)=2.2Ni+6Cu-1.1Cr-13Si-1.2Mn +32

The invention discloses a method for assessing measurement uncertainty of a coordinate measuring machine. The method of avoiding the complex relation among error sources of the coronate measuring machine and unknown transmission rules between the error sources is adopted, the method of analyzing characteristic indexes of a measurement system of the coordinate measuring machine is adopted, the method and approach of verifying or obtaining corresponding system characteristic index values of the measurement system, an integral calibration method and a detail experiment scheme for obtaining a stability index and a reproducibility index of the coordinate measuring machine are designed, the influence degree of actual temperature in temperature compensation, a standard grating rule and a linear expansion coefficient of a tested workpiece on a measurement result is considered, and the relatively integral measurement uncertainty of the coordinate measuring machine is obtained through synthesis in the root of square sum.

An implantable cardiac stimulation system provides capture threshold stability assessment. The system includes an implantable pulse generator that provides pacing stimulation pulses, an implantable lead system that couples the pulse generator to a patient's heart, and a capture threshold test circuit that performs capture threshold tests with the pulse generator and provides capture thresholds at spaced apart times. A capture threshold processor responsive to the capture thresholds provides capture threshold stability indicia. The capture threshold stability indicia may be a threshold stability index equal to the ratio of the peak-to-peak threshold fluctuation and the mean capture threshold. The threshold stability index may be compared to a given standard to determine if the capture thresholds are unstable.

The invention relates to a transmission capacity and wind and fire bundling transmission optimization method, and in particular relates to the transmission capacity and wind and fire bundling transmission optimization method. The invention firstly establishes an index system considering receiving end power grid electricity power demand, static security index, transient stability index, economic index and power transmission electrovalence. The indexes are quantized for establishing mathematical model of multi-objective functions and the multi-objective optimization algorithm is adopted for computing. During the solving process, multi-objective functions are solved simultaneously and computed for obtaining alternative solution meeting constraint condition, and the entropy function method is adopted for confirming the optimal compromise solution. The index system considering receiving end power grid electricity power demand, static security index, transient stability index, economic index and power transmission electrovalence is adopted, the evaluation index is convenient to compute and analyze in a quantitative manner, the transmission capacity of the electric transmission line and the influence to the receiving end power grid from sending end wind and fire bundling ratio can be reflected synthetically.

The invention discloses an alluvial river bank collapse early warning method. Aiming at collapse of a binary structure bank of an alluvial river under long-term action of water flow, the position of bank collapse can be forecasted early; meanwhile, rolling forecast can be continuously performed by utilizing the characteristics that river section data is relatively easily acquired and more forecasting times are present, and the forecast accuracy is improved. The method comprises the following steps of: determining a river bank stability index, forecasting river bed deposition and erosion change and performing early warning and judgment on the bank collapse. By using the bank slope stability index determining and judging standard, comparing with a forecast slope and combining with a gradingjudgment index system, the position of a dangerous bank section can be early warned, and technical support is provided for dike maintenance and management.

The invention discloses a testing method for the interface adhesion performance of a road asphalt mixture. The method comprises the steps of performing sample preparation on original asphalt; performing short-term aging and sample preparation; performing pressure aging and sample preparation; performing a water freezing and thawing testing and salt freezing and thawing testing; preparing an aggregate test specimen; testing surface free energy parameters of asphalt and the aggregate test specimen; determining the asphalt and aggregate interface adhesion performance; comparing interface adhesion performance indexes of various asphalt and aggregates on different conditions so as to select asphalt road materials suitable for being used under different climate environments. According to the testing method, asphalt and aggregate interface adhesion work on the drying condition, peeling work of an asphalt and aggregate interface on the water condition and a water stability index determined by the ratio of the adhesion work to the peeling work can be effectively calculated and obtained for different asphalt and aggregates under the different temperatures, aging conditions and different freezing and thawing cycle condition effects; scientific basis is provided for quality inspection and engineering characteristic evaluation of a cold region asphalt road material product.

The present invention provides one kind of viscosity index improver of ethylene-propylene copolymer. The viscosity index improver is prepared with base oil in 75-88 wt% and ethylene-propylene rubber in 12-25 wt%, and through mixing in a normal pressure sol degrading kettle, heating to 95-140 deg.c slowly, and stirring at constant temperature for 3-10 hr. The viscosity index improver for modulating high grade internal combustion engine oil has high thickening capacity of 0.85-0.96 sq mm/s, low shear stability index below 20 %, outstanding low temperature performance, and small added amount of 6.5-8 %.