45 results about "Stability change" patented technology

This application discloses a temperature compensating circuit of a power amplifier. The temperature compensating circuit performs temperature compensation on a constant bias current; or converts a constant bias voltage into a current, performs temperature compensation, and then provides a base electrode of a power tube with a temperature-compensated bias current. The temperature compensation comprises: when the power tube works normally and is at a temperature below a threshold temperature, making a current variation of the collector electrode of the power tube positively correlated with a temperature variation; and when the power tube works normally and is at a temperature above the threshold temperature, or when the power tube is mismatched and works abnormally, making the current variation of the collector electrode of the power tube negatively correlated with the temperature variation. According to the temperature compensating circuit of the power amplifier, reliability problems such as an output power variation, a stability variation, linearity deterioration, and overheating and overburning caused when a temperature of the power amplifier varies are resolved.

A system for detecting changes in business stability is provided. The system includes a merchant system that receives periodic payment data from one or more users, such as credit card transaction data. A credit processor coupled to the merchant system receives the periodic payment data from the merchant system and stores the periodic payment data, such as when the credit processor is compiling the credit card transaction data for submission to a credit card company. A merchant credit/risk system coupled to the credit processor generates business stability data from the periodic payment data, such as by determining when changes in the periodic payment data exceed allowable variations for such changes.

The invention discloses a universal strategy for efficiently improving enzyme thermodynamics stability. The strategy is specifically implemented in the way of taking a catalytic residue of zymophore as the center, selecting a high-flexibility residue 10 angstroms away from the center at most as a target locus according to the B-factor value in an enzyme crystal structure, and obtaining a mutant with enzyme thermodynamics stability improved through mutation screening. Under the guidance of the strategy, the thermal stability of candida rugosa lipase 1 with a highly complicated structure is improved remarkably. By means of stability change results of protein (LipA) with the smallest structure and moderately complicated protein (CalB), it is found that the success rate of enzyme mutation can be increased remarkably through mutation of residues with high B-factor 6-10 angstroms away from the catalytic residue. Meanwhile, through system analysis of a mutant structure-function relationship, a foundation is laid for deep research of enzyme region stabilization law and development of enzyme stabilization technique.

Methods and computing systems for generating a protein stability lookup table and a predictive model. These methods and systems are useful for predicting the thermal stability of a protein sequence and for predicting mutations that may enhance the thermal stability of a protein given its amino acid sequence and/or three dimensional structure. The protein stability lookup table and a predictive model are based on a combination and analysis of related protein sequences and, where available, protein structure data, and relative stability data from mesophilic and thermophilic organisms and experimentally determined stability changes of wild type proteins and their mutants.

A computer program product including computer usable program code embodied on a tangible computer usable storage medium, includes: computer usable program code for detecting a stability change in a first computer system; computer usable program code for comparing a first set of software applications installed on the first computer system to each set of software applications installed on a plurality of other computer systems in communication with a management module; computer usable program code for identifying a second computer system from among the plurality of other computer systems, wherein the set of software applications installed on the second computer system includes all of the first set of software applications except for a given software application; and computer usable program code for identifying the given software application as the cause of the stability change in the first computer system.

A method for determining that stability of spin motion of three-body tether system in space relates to the technical field of spacecraft flight and can determine the spin stability of the system strictly in theory. The invention discloses a method for judging the spin stability of a space loop three-body tether system. The invention comprises the following steps: establishing a non-inertial reference frame with the mass center of the system as the origin, and obtaining a system dynamics equation; The disturbance equation of the system is obtained by introducing vector formal variables. The stability of perturbed equation is analyzed by variational equation. By setting the initial variables of the periodic solution of the spin motion of the system and comparing the relationship between theperiodic solution of the spin motion and the characteristic multiplier, the stability of the spin motion of the system is determined. The invention provides an accurate judging method for the stability of the spin motion of the loop three-body tether system from the mathematical point of view, and can quickly judge the stability change of the system for the same system with different spin velocities and different parameters in theory.

The invention discloses a simplified analysis method for an inherent frequency and the stability of a rotational symmetric structure. The method comprises the steps of establishing a complete dynamic differential equation of a system, a dynamic differential equation adopting a no-extension hypothesis, and a dynamic differential equation adopting an extension hypothesis: establishing the complete dynamic differential equation of the system; establishing the dynamic differential equation adopting the no-extension hypothesis; establishing the dynamic differential equation adopting the extension hypothesis; introducing coordinate conversion for converting the three dynamic differential equations to a support follow-up coordinate system so as to obtain corresponding three constant coefficient partial differential dynamic equations; performing discrete processing on the three constant coefficient partial differential dynamic equations in the support follow-up coordinate system to obtain three constant differential matrix equations; obtaining an eigenvalue of the complete dynamic differential equation and eigenvalues of two simplified dynamic differential equations; and analyzing a parametrically excited vibration mode characteristic and a dynamic stability change law of the rotational symmetric structure according to the three eigenvalues. According to the method, a specific analysis expression of system eigenvalues can be obtained more clearly.

The invention belongs to the agricultural machine performance test equipment, and concretely relates to a test bed for a pneumatic rape seed sowing device. The test bed is characterized in that the test bed comprises test bed supports, thermal gas mass flow-meters, a positive pressure fan, a negative pressure fan, a positive and negative pressure tube precision seed sowing device, a positive and negative pressure tube assembly, a transition shaft assembly, a power input motor, a regulation and control frequency converter and the like. The test bed can be used for the simultaneous test researches on the sowing amount consistency and stability of a plurality of the pneumatic rape seed sowing devices, and also can be used for the test researches on the change rules of the sow amount consistency and stability of the seed sowing device under the synergistic action of different positive pressure gas flows, negative pressure gas flows and the rotation speeds of the seed sowing device. The test bed has the advantages of simple structure, convenient use operation, high measure precision and wide application range, and can also be used for the test researches on other pneumatic seed sowing devices.

Described is a system for predicting system instability. The system can measure the degree of the network's instability due to critical transitions using the leading eigenvalue of the covariance matrix, where the instability measure is invariant to (1) the changes in network structure in terms of addition/removal of nodes and links, and (2) the feedback of the global system stability to the changes in stability. Based on that, the system is operable for providing an estimation of the network's changing connectivity when the network is near critical transitions.

The invention relates to a method for visibly detecting the storage stability change of protein bars. According to the technical scheme, the method comprises the following steps: 1) preparing a protein bar model system; 2) performing fluorescence dyeing on a sample; 3) performing fluorescence bleaching recovery testing on the sample by using a laser confocal scanning microscope. By adoption of the method, the degree that the texture of a lactoprotein bar changes in the storage process can be monitored on line, the quality and the shelf life of a high protein product such as the protein bar can be predicted, and the inner mechanism that the texture of the protein bar is hardened in the primary preservation period can be revealed according to the molecule level.

The invention discloses a method for rapidly detecting the storage stability of fuel oil for heavy ships. The method comprises the following steps: filling a gradient viscosity tube having a special structure with a test oil product, and introducing an oxygen-containing gas to carry out accelerated oxidation; and respectively extracting the test oil product from different sampling openings, detecting the sampled test oil product, and processing all detected groups of data to obtain the property parameters of the fuel oil. The method can simulate the stability change of the fuel oil for heavy ships with time or being exposed to air in the whole process period of blending storage, sale, ship storage cabinet storage and combustion, and has the characteristics of fast measurement, good result accuracy, improvement of the timeliness of the detection process, and compensation for the gap in methods for detecting the storage stability of the fuel oil for heavy ships in China.

The invention provides a control method for compensating receiving system gain temperature stability in real time. According to the control method, receiving system gain stability change resulting from a temperature can be compensated rapidly and efficiently. The method is realized through utilization of the following technical scheme that gain values at different frequency points of each channelunder different temperatures are actually measured, and a data table of a channel-frequency-temperature-gain corresponding relationship is established and is flash programmed into FLASH; a DSP processing module in a signal processor queries gain data of corresponding channels, frequencies and temperatures stored by a FLASH circuit according to reported temperature information of a digital temperature sensor and computes gain difference of concerned receiving channels and receiving frequencies among the channels under different temperatures, through application of the queried gain data, whereinthe gain difference is changed along with the temperatures; and gain fluctuation amplitude resulting from temperature change is compensated through utilization of the gain difference, and an error factor resulting from the gain difference among the channels of a receiver circuit system changed along with the temperatures is compensated.

The invention discloses a breeding swine frozen semen unfreezing diluent, and a preparation method thereof, and belongs to the technical field of swine frozen semen unfreezing. The breeding swine frozen semen unfreezing diluent can be used for solving a problem that semen oxidation damage of swine frozen semen is easily caused in unfreezing diluting process. The breeding swine frozen semen unfreezing diluent is composed of D-glucose, fructose, potassium chloride, disodium ethylene diamine tetraacetate, sodium bicarbonate, trisodium citrate, polyvinyl alcohol, gentamycin, astragalus polysaccharide, and resveratrol. A preparation method comprises following steps: 1, D-glucose, fructose, potassium chloride, disodium ethylene diamine tetraacetate, sodium bicarbonate, trisodium citrate, and polyvinyl alcohol are prepared into an aqueous solution with double distilled water; 2, the aqueous solution is introduced into a water-bath kettle at 26 DEG C for balance treatment until full dissolvingis realized, and the pH value is stable; 3, a bacterial filter is adopted for filtering; 4, and gentamycin, astragalus polysaccharide, and resveratrol are added 30min before using. The breeding swinefrozen semen unfreezing diluent is capable of achieving oxidation resistance effectively, and reducing oxidation damage of violent stability change in frozen semen unfreezing process on semen.

The invention discloses a system for predicting the influence of amino acid variation on protein structure stability, and a method thereof. The system consists of an amino acid variation information input module, an amino acid variation site attribute calculation module, a protein sequence attribute calculation module, a prediction stability change module and a prediction result output module. The method comprises the following steps that: inputting and obtaining variation information; extracting AAindex attribute features, and calculating the micro-electrical physical and chemical attribute features of amino acid; calculating the conservative property and the protein attribute of a protein sequence corresponding to the amino acid variation; adopting a two-layer three-classification random forest algorithm to calculate the influence of the amino acid variation on the protein stability; and storing and outputting a prediction result. By use of the system and the method, on the basis of the amino acid variation provided by a user and the corresponding protein sequence, a situation that the structure stability of protein where the amino acid is positioned is raised and lowered or is invariant due to the amino acid variation is accurately predicted, a corresponding probability is also accurately predicted, and the result is stored and sent to the user to be stored.

The invention belongs to the field of plastic pipe manufacturing, and particularly discloses a vacuum spraying box with an automatic water level control function. The vacuum spraying box comprises a vacuum spraying box body. The inner wall of the bottom end of the vacuum spraying box body is connected with a vertically-arranged partition, a sliding groove is formed in one side of the partition, asliding block is slidingly connected into the sliding groove, the side, away from the sliding groove, of the sliding block is connected with a connecting rod, the side, away from the sliding block, ofthe connecting rod is connected with a float ball valve, the side, away from the connecting rod, of the float ball valve is connected with a sleeve, the interior of the sleeve is connected with a spring, the end of the spring is connected with a mounting plate, the mounting plate stretches out of the sleeve, and a conductive wheel is rotationally connected between the inner walls of the two sidesof the mounting plate. The water level in the vacuum spraying box can be guaranteed, thus, it is guaranteed that the change of the pressure and the stability of cooling water slightly fluctuates, thepercent of pass of production of plastic pipes is increased, a filter plate at the position of a water outlet of the spraying box can be cleaned through the device, blockage of the water outlet is avoided, and the vacuum spraying box is suitable for being popularized.

The invention provides a three-dimensional visual multifunctional grouting test model device. The three-dimensional visual multifunctional grouting test model device comprises a test module and is characterized in that the test module is of a cuboid-like structure formed by a top cover, a top cover sealing ring, a tempered glass box, a grouting pipe, a bottom plate, a bottom plate sealing ring, abottom support and bottom ribbons, the steel top cover, the tempered glass box and the tempered glass bottom plate are connected through high-strength bolts, grout diffusion conditions during groutingcan be favorably observed dynamically through the transparent tempered glass, a water injecting pipe is reserved at the center of the top cover, and the front side of the box is provided with a grouting pipe. The device has the advantages that the device can be used for simulating grouting under water-free, still-water, flowing-water and high-pressure-water environments; in addition, the device is creatively provided with the bottom ribbons, and the ribbons can be removed step by step according to test needs so as to analyze the stratum stability change conditions before and after the grouting.

The invention relates to a process to manufacture a water-in-oil emulsion, comprising •10 to 85 wt. % of liquid oil; •0.5 to 50 wt. % of fat powder comprising hardstock fat; •10 to 85 wt. % of a water-phase; •0.005 to 5 wt. % of lecithin; and •0.01 to 5 wt. % of monoglyceride; comprising the steps of: 1. providing a solution of at most 5 wt. % of the liquid oil, based on the total amount of liquid oil, comprising at least 50 wt. % of dissolved lecithin, based on total amount of lecithin; and at least 50 wt. % of dissolved monoglyceride, based on total amount of monoglyceride; wherein the temperature of the solution is at least 50 degrees Celsius; 2. providing an oil-continuous system comprising at least 75 wt. % of the liquid oil, based on the total amount of liquid oil, wherein the system has a temperature of from 0 to 20 degrees Celsius; 3. contacting the solution provided at step ‘I’ with the system provided at step ‘2’; 4. mixing the mixture provided at step ‘3’ to provide a water-in-oil emulsion; wherein any remaining ingredients are added whole at step ‘2’, step ‘3’ or step ‘4’ or added in parts in any combination at step ‘2’, step ‘3’ and step ‘4’. The process of the invention results in water-in-oil emulsions with an improved stability and a reduced batch-to-batch variation in stability.

The invention relates to a method for rapidly and quantitatively evaluating the quality stability of traditional Chinese medicine injection, and belongs to the technical fields of pharmacy and traditional Chinese medicine evaluation. The method comprises the following steps: firstly, diluting a traditional Chinese medicine injection solution by a certain number of times, and setting a standard absorption curve of the traditional Chinese medicine injection; secondly, determining an isoabsorptive point of the absorption curve of the traditional Chinese medicine injection at the dilution times according to a stability experiment; thirdly, computing the areas under the absorption curve in front of and in rear of the isoabsorptive point; fourthly, further determining the reference values of theareas under the absorption curve in front of and in rear of the isoabsorptive point and/or the reference value of the ratio of the areas under the absorption curve in front of and in rear of the isoabsorptive point according to an acceptable active substance change degree; fifthly, performing stability change judgment according to the fact that whether the areas under the absorption curve in front of and in rear of the isoabsorptive point and/or the ratio of the areas under the absorption curve in front of and in rear of the isoabsorptive point exceeds a range after a standard is determined.

The invention provides a wheelchair stability detection device and method, belonging to the technical field of wheelchair balance detection. The beneficial effects of the present invention are: the present invention can make the distance between each wheel of the wheelchair be calculated by the known data measured by the existing balance panel, avoiding manpower measurement, fast and accurate; making the load center point of the wheelchair and The center of gravity of the wheelchair does not require a cumbersome and complicated detection process, and can scientifically and reasonably measure the changes in the stability of the wheelchair, providing an intuitive and effective basis for the formulation of a plan to improve the stability of the wheelchair; it is convenient for the production and use of wheelchairs. The evaluation has greatly guaranteed the personal safety of the wheelchair user; in addition, the sensor layout is reasonable and the structure is exquisite, and it is not disturbed by the lateral force when testing the stability of the wheelchair, and the measurement results are accurate, which can scientifically and reasonably detect the stability of the wheelchair vehicle .