30 results about "Minimum free energy" patented technology

The invention discloses a computer simulating method based on protein folding course of synthetic algorism, which comprises the following steps: selecting non-lattice protein model; affirming energy function; searching three-dimensional structure of protein with minimum free energy; simulating the folding course; analyzing data; modifying. The invention combines the prediction of knowledge and the prediction of simulation, which improves the precision and calculating speed greatly without large amount of specific details in the folding course.

A reliable semiconductor device is provided with a layered interconnect structure that may develop no problem of voids and interconnect breakdowns, in which the layered interconnect structure includes a conductor film and a neighboring film so layered on a semiconductor substrate that the neighboring film is in contact with the conductor film. In the device, the materials for the conductor film and the neighboring film are so selected that the difference between the short side, a_p, of the rectangular unit cells that constitute the plane with minimum free energy of the conductor film and the short side, a_n, of the rectangular unit cells that constitute the plane with minimum free energy of the neighboring film, {|a_p−a_n|/a_p}×100=A (%) and the difference between the long side, b_p, of the rectangular unit cells that constitute the plane with minimum free energy of the conductor film and the long side, b_n, of the rectangular unit cells that constitute the plane with minimum free energy of the neighboring film, {|b_p−b_n|/b_p}×100=B (%) satisfy an inequality of {A+B×(a_p/b_p)}<13. In this way, the diffusion of the conductor film is retarded.

The invention relates to the field of protein structure prediction and discloses a protein structure prediction method based on the improved niche genetic algorithm. According to the method, the niche genetic algorithm is introduced into protein structure prediction, and the genetic algorithm is improved to a certain extent in terms of selection and variation. Based on data obtained from experiments and results obtained through comparison with other methods, the method has the advantages that the corresponding minimum free energy value of protein can be searched more comprehensively, so that a more stable protein structure is obtained; operation time is shortened greatly, meaning that the method has high time efficiency.

The invention relates to a RNA sequence secondary structure prediction method based on base fragment coding and ant colony optimization, belonging to the field of bioinformatics research. The RNA sequence secondary structure prediction method comprises the steps of: recoding an RNA sequence, and obtaining a corresponding coding sequence according to corresponding values in a coding table and a coding association list; eliminating a redundancy stem region by a strategy of extending rightwards according to an exact matching table and a partial matching table to obtain all possible useable stem region sets; giving two-dimensional heuristic information in the ant colony optimization, selection rule of an initial stem region and the next stem region and updating strategy of pheromones to construct compatible subsets of all possible stem region sets; and finally obtaining a secondary structure with minimum free energy. The invention can rapidly, accurately and effectively predict the secondary structure without including a pseudojnot RNA sequence, can output the obtained result in a bracket mode way, and is superior to the main prediction technology at present in the aspects of sensitivity and specificity of the prediction of the RNA sequence second structure.

The invention discloses a solid propellant formulation energy optimization design method based on a genetic algorithm. The method comprises a first step of modeling, and building an energy characteristic calculation model of solid propellant according to a minimum free energy principle; a second step of setting and storing initial parameters, inputting component species used by the solid propellant, and a chemical formula and a quality proportion range of each component, and inputting species of combustion products produced by the solid propellant after being combusted, and chemical formulas and relative molecular mass of all the combustion products or selecting all the combustion products in a combustion product data base; and a third step of calling a genetic algorithm module by a data processor, and conducting optimization design to quality proportion of the designed solid propellant. The solid propellant formulation energy optimization design method based on the genetic algorithm is simple in steps, reasonable in design, convenient to achieve, good in using effect, capable of fast obtaining an optimum proportion of highest specific impulse of the solid propellant and effectively overcoming the defects, existing in an existing solid propellant compound design process, of being high in energy characteristic test cost, long in period, large in test dose, and the like.

The invention discloses a liquid drop contact angle calculation method under a given surface second-level nano-micro structure. The calculation method comprises the following steps: adopting a nano-micro geometric measuring instrument to measure the structure size of the given second-level nano-micro structure to obtain the side length, the space and the height of the nano-micro structure; adopting general assumptions in Young equation, Wenzel equation and CB equation deduction, and calculating a roughness factor and an area fraction under micrometer and nanometer size under the assumptions; according to different infiltration states under a micrometer structure and a nanometer structure, dividing the infiltration states of the second-level nano-micro structure into four situations, and inducing and simplifying the system free energy calculated modes of four given surface second-level nano-micro structures; and in virtue of a C++program compiling module in Visual Studio2012 software, applying a Soushan method to calculate the system free energy under different infiltration states, finding interface minimum free energy under a stable state, and obtaining a contact angle corresponding to the interface minimum free energy.

The invention discloses a method for predicting a secondary structure of a ribonucleic acid (RNA) sequence based on complex programmable logic device (CPLD) base fragment encoding and ant colony algorithm and belongs to the field of bioinformatics research. The method comprises the following steps: recoding the RNA sequence according to an association table by using the CPLD; obtaining a corresponding encoding sequence according to corresponding value in an encoding table and an encoded association table, removing a redundancy stem area through a right extension strategy through a complete matching table and an incomplete matching table, and obtaining all possible stem area sets; giving two-dimensional heuristic information and a selection rule of an initial stem area and the next stem area in the ant colony algorithm, and constructing a compatible subset of all the possible stem area sets through an information element update strategy; and finally, obtaining the secondary structure with the minimum free energy. The method can rapidly, accurately and effectively predict the secondary structure of the RNA sequence which does not contain false knots and output the obtained result in a bracketing mode, has sensitivity and specificity in the aspect of judging two parameters for predicting the advantages and weakness of the secondary structure of the RNA sequence, and is superior to the conventional mainstream prediction technology.

The present invention provides a method of selecting a mRNA for production of a polypeptide of interest comprising: a) producing an array of individual mRNA sequences comprising different nucleotide sequences encoding the polypeptide of interest; b) determining one or more or two or more of the following parameters for each individual mRNA sequence of (a): (i) minimum free energy (MFE) RNA secondary structure; (ii) ensemble free energy (EFE); (iii) frequency of the minimum free energy (FMFE) RNA secondary structure in a thermodynamic ensemble; and (iv) ensemble diversity (ED); c) ranking the individual mRNA sequences of the array according the parameters determined in step (b); and d) selecting a mRNA sequence from the ranked array of step (c), wherein the selected mRNA produces the polypeptide of interest. The present invention further provides a method of selecting a mRNA for enhanced and reduced production of a polypeptide of interest.

The invention provides a prediction method and device for an RNA false knot structure based on k stems. The prediction method comprises the following steps that a section of RNA base sequence is input, and false knots and k (k is larger than or equal to one) stems are defined; RNA bases and k stems are searched for from left to right, and all the found k stems are subjected to determined marking; the false knots are searched for according to the characteristic that the k stems intersect to form the false knots, and the minimum free energy of the RNA false knot structure including the k stems is calculated; the RNA false knot structure is output. According to the prediction method, the searching speed is high, the accuracy is high, and the sensibility, specificity and the like are better than that of other related algorithms such as a PKNOTS algorithm. The prediction method is more effective on the aspect of plane false knot prediction than the PKNOTS algorithm.

The invention provides a giant magneto-impedance modeling method of amorphous wire under the effect of a non-axial magnetic field. At first, by means of the LLG equation, a magnetization vector rotation equation is constrained and an expression of total energy inside amorphous wire is built; then, according to the principle of minimum free energy of system, a magnetization vector motion equation is built; amorphous wire magnetic conductivity tensor under the effect of a non-axial magnetic field is obtained through solving the motion equation; an electromagnetic field equation of the circumferential and axial magnetic field parameters of amorphous wire are established by using the intrinsic relationship between magnetic field strength and magnetic induction strength and Maxwell equation; finally, for the application conditions of high frequency and low frequency, the solution of the amorphous wire electromagnetic field equation is simplified; a general expression of amorphous wire giantmagneto-impedance by means of a high frequency and low frequency approximation. The giant magneto-impedance modeling of amorphous wire under effect of non-axial magnetic field can be accurately builtand the method for calculating giant magneto-impedance is given.

A method of diagnosing a disorder includes obtaining a medical image of a subject. A Helmholtz Minimum Free Energy is computed from the medical image. A negative slope of the Helmholtz Minimum Free Energy is determined, from which a glial force is computed. The existence of a disorder in the subject is diagnosed if a value of the glial force is within a predetermined range. The disorder can be, for example, a brain disorder, such as Alzheimer's disease, Parkinson's disease, and/or schizophrenia. Other examples of disorders are epilepsy and rheumatoid arthritis. The subject can be, for example, a human subject.

A method and device for locating an emitting source of which measurements of emission propagation at locations different from that of the emitting source can be obtained from those locations, lacking space perception, using a sensor mobile along a self-generated path. After having obtained an emission propagation measurement from the mobile sensor at the mobile sensor location, a free energy variation for moving the sensor from its current location to each of plural possible next locations of the mobile sensor is computed, the free energy being computed as a function of a standardized projected probability field of the location of the diffusing source based on previous emission propagation measurements obtained along the self-generated path. A minimum free energy variation value amongst the computed free energy variations is determined and the location associated with the determined minimum free energy variation is identified as being the next location of the sensor.

The invention relates to a ployglutamine pathogenesis analyzing method which includes the following steps of S1, selecting a protein model which is a two-dimensional integral HP model; S2, determining an energy function; S3, searching for a protein two-dimensional structure with the minimum free energy, namely, searching for a two-dimensional structure corresponding to protein with the minimum energy by the adoption of MPI parallel algorithm of a peer-to-peer mode. Compared with the prior art, individual temperatures of the structure are determined through the sequence of individuals in a polyglutamine protein structure group, higher temperature is distributed to the inferior individuals so that the inferior individuals are more likely to change into the superior individuals, and meanwhile, by means of cooling factors, convergence speed is increased in a parallel mode.

The invention discloses a method for designing high-sensitivity and high-specificity mismatch nucleic acid sequences. The method includes computing delta MFE (minimum free energy) values of mismatch sequences, target sequences and homologous interference sequences to determine candidate mismatch nucleic acid sequences. The method has the advantages that the shortcoming of dependence on experienceof mismatch nucleic acid sequence designs can be overcome by the aid of the method, mismatch nucleic acid sequences can be reduced to a great extent, particularly, workload for designing mismatch primers can be relieved to a great extent, a few candidate nucleic acid sequences can be quickly obtained from large quantities of mismatch nucleic acid sequences, and the method is favorable for determining the optimal nucleic acid sequences from the few candidate nucleic acid sequences; the high-sensitivity and high-specificity mismatch nucleic acid sequences still can keep high affinity with the target sequences with low concentration on the basis of mismatch primers designed by the aid of the method, and is poor in affinity with the homologous interference sequences, accordingly, the amplification sensitivity of the target sequences can be effectively improved, and the method can be effectively used for highly homologous nucleic acid sequences and can be particularly effectively used for miRNA [micro-RNA (ribonucleic acid)] amplification.

The invention discloses an RNA tertiary structure prediction method based on parallel and Monte Carlo strategies, and belongs to the field of structure prediction. The method comprises the following steps: performing conformation space sampling by using a parallel mechanism; scoring is carried out according to the latest updated energy function; performing reasonability judgment on the conformation based on Monte Carlo operation of Stepwise annatz through two rounds of potential energy judgment; and finally, judging structural integrity and modeling precision, and processing a result until a stable high-precision and high-integrity RNA tertiary structure is obtained. According to the RNA tertiary structure prediction method provided by the invention, the high-precision and high-integrity RNA tertiary structure can be obtained. The RNA three-level structure prediction method based on parallel and Monte Carlo strategies is high in flexibility, the Monte Carlo times can be specified, and the modeling precision and the modeling time cost can be measured by a user; according to the method, the problem that RNA motif modeling is incomplete in the prior art is solved; according to the method, the breadth and depth of conformation sampling are increased, the influence of pseudo minimum free energy is reduced, and the modeling precision is improved.