In this paper, two methods for solving sparse solution of absolute value equations are proposed. One of these methods is l1 method in which ‖x‖1 is used to approximate ‖x‖ 0 . It is proved that in fact l1 problem is a linear programming. The other method is a reweighed l1 method in which a concave function is used to approximate‖x‖0 . By using linearization technique to the concave function, an algorithm for finding sparse solution of absolute value equations is proposed. The main part of this algorithm is solving a series of linear programming. The collections between the two methods are given. The results of the numerical experiments about these two methods are given which show that the two methods are all very efficiently in finding sparse solution of absolute value equations.
Given the Kalman filter algorithm in battery state of charge of the initial value is generally determined by the open--circuit voltage. Traditional open-circuit voltage uses the correspondence between the open-circuit voltage and the battery state of charge to estimates SOC. But it takes a long time. This paper proposes a new approach,by analyzing the battery discharge curve and recovery curve,with combination of battery equivalent model,fitting open-circuit voltage formula. Opencircuit voltage of the battery is estimated by the charging terminal voltage. It solves the long standing problem and improves the accuracy of the open circuit voltage,thereby increasing the SOC estimation accuracy. Then based on Thevenin battery model,through the battery test platform to identify the battery model parameters and validate its reliability. Adopting improved open-circuit voltage of SOC estimated value as an initial value. At last extended Kalman filter algorithm completes the battery SOC estimation. The results show that this method solves the problem of large initial estimation error caused by variation of the initial value and improves the overall estimation accuracy.
This paper investigates the catalysis of D072 cation exchange resin on the polymerization of acetaldehyde using GC as a means of analysis,the influence of different factors on the catalysis reaction is discussed. The results indicate that D072 has preferable catalytic activity,the product of reaction is paraldehyde; when the reaction temperature was 15 ℃,the content of acetaldehyde and paraldehyde were 10. 0% and 31. 6% under equilibrium condition,the amount of aldehyde is close to trademark label the acetaldehyde content of 40%; on the basis of determining reaction rate,the kinetics equation was obtained as follows: υ = kc = 319. 2e-4 286. 3 T c.
Fenticonazole nitrate was synthesized by a new route and the reaction conditions was improved.Compared with the method reported,the present route has several advantages of convenient operation,mild reaction conditions and stable yield.This method is fit for industrial process.The results show that the optimum condititions were: tetrahydrofuran was used as the solvent,the reaction temperature was 25 ℃ and the reaction time was 10 h.The overall yield was result 21.3%.Its structure was characterized by elemental analysis,IR,1H-NMR and MS.
In this experiment,using different catalysts and dehydration agents,2,4,8,10-tetra-oxa-3,9-di(3'-methanoyl-phenyl)spiroundecane were synthesized by condension of pentaerythriol with m-phthaladehyde.The yield of the intermediate of the bi-acetal of pentaerythriol and m-Phthaladehyde was better with titanium sulfate as a catalyst and methylbenzene as a dehydration agent.TLC was used to monitor the reaction process.The structure of 2,4,8,10-tetra-oxa-3,9-di(3'-methanoyl-phenyl)spiroundecane was determined by IR and NMR.
The article discussed the synthesis of 2-( 1H-Benzoimidazol-2-yl)-phenol derivatives using 2-hydroxy aromatic aldehydes with aromatic 1,2-diamine in the presence of manganese (Ⅲ) acetate at room temperature. Fluorescent spectra of all the compounds synthesized were measured in methanol and the fluorescent characteristics of them were investigated.
This paper presents principal component analysis and cluster analysis of the economic development of 18 districts and counties in Tianjin based on ten major appropriate economic indications,comprehensively evaluates their economic development level.
Using mixed sodium alginate and polyviny1 alcohol, immobilizing monosultap high effective degradation Bacillus megaterium, and designing orthogonal experiment to observeing the degradation ability to the soil of immobilized Bacillus megaterium, and comparing immobilized Bacillus megraterium and dissociative Bacillus megraterium in relative degradation active. After all the above experiment, an optimal immobilizing condition is drawn as below: Polyviny1 Alcohol concentration: 100/0; Sodium Alginate concentration: 1.50/0; CaCl2 concentration: 1.50/0; Bacillus megaterium concentration: 20/0.
The genetic algorithm is based on the search algorithm of natural selection and genetic mechanism. This paper attempted to discussi the way in solving famous 0-1's knapsack problem, and improved the classics genetic algorithms by mixing use methods of singlepoint-crossover and multipoint-crossover as well as combining tradition algorithms with genetic algorithm in order to gain the better approximate solution about the problem.
The article discusses the synthesis of 1,2-dioxane derivatives using 1,1-diphenyl-ethene derivatives and 2,4-pentanedione in the presence of manganese (Ⅲ) acetate under ultrasonic comparing with the traditional stirring method on the base of recent progress in the field of ultrasonic sonochemistry. It was proved that ultrasonic can catalyze the reaction of radical-cyclization induced by manganese (Ⅲ). Meanwhile, the future development of sonocatalysis has been discussed.
Enterprise assets is the economic resources to bring about the profit interest. Therefore there is an significant problem to be called for our attention. That is how to provide risk return decision analysis and make reasonable evaluation on assets managerment. We use assets adjustment model to make profitability analysis, and apply factor redesgin methods to set up assets management evaluation model.
This paper presents the history and characteristic of the networked control systems (NCSs), as well as the complexities and advantages of NCSs, summarizing the research results on NCSs packet dropout. Based on the prediction of Grey Model, a method to compensate for packet dropout is introduced, which is used in an inverted pendulum system controlled through network. The simulation shows that the output of packet dropout but compensated is nearly the same was no packet dropout, which verifies the correctness and effectiveness.
The application areas of EL are described in this paper based on analysing the characteristic of EL,the pinsfunctions,internal principle,and the useful integrated circuit of the chip SP4422A driving EL and the integrated circuit of the chip IMP803 driving EL are introduced.
Based on parametric finite-element method, this paper takes the modeling of cold drawing rifled tubes as an example to describe an associated modeling method with the software of PRO/E and MSC.Marc.
This article discusses the significance of using Dephi language and SQL technology to develop universities and colleges' scientific research management system,and how to design and realize such a system in order to make it well accommodate management of scientific research related schedules,achievements,theses,treaties,expenses and personnels,and more convenient for scientific research management sectors in universities or colleges to apply so as to improve the their work efficiency through the automation of management.
Abstrcat 1-Amino-2-hydroxy-4-naphthalenesulfonic acid and a dye intermediate, were synthesized in the presence of catalysts CuSO_4 and FeSO_4. The effect of the these catalysts on the reaction system is discussed. The result has shown that the yield is enhenced as increasing the catalyst dosage, the yield reacheing 68.40/0 in the optimal condition, which the reaction is performed for 8 h at 50℃ in the presence of 0.2 g CuSO_4.
In this paper, according to the characteristics of completed structure for slewing jib crane, finite element model of the structure is completed and its static and model based on ANSYS software is analyzed. The relevant strain and stress distribution graph was obtained and optimized the design procedure to reduce its mass. There by the analysis had some guide for improving the jib crane′s design and fatigue life .
The paper introduces the design method of the digital filter, comparatively analyzing the window function by an example.
Using mobile IP to realize the core network of the third generation mobile communication system UMTS, a user can roam between different net in Internet. This article analyzes the basic theory of mobile IP and discusses the realization of mobile IP in UMTS core network. It also analyzes the structure of UMTS Release R5 network. The mobile IP in the UMTS core network will gradually complete and IPv6 will finally apply.
