Applied Mechanics and Materials Vols. 675-677

Abstract: An attempt was made to reduce the recurrence rate of childhood asthma by improving the family environment and creating a good living environment to avoid risk factors in the family environment. 80 Cases of children with bronchial asthma treated in one hospital were selected and taken as the study subjects. After they were treated with the conventional therapy and discharged, the patients were randomly divided into a control group and an experimental group. The children in the experimental group were followed up for six months and guided to improve risk factors in the family environment and avoid the risk factors in the environment to induce asthma attack. The results showed that the recurrence rate of asthma in children in the experimental group was significantly lower than that in the control group. To improve the family environment and create a good atmosphere can effectively avoid the recurrence of childhood asthma.

Abstract: The impact of family environmental factors on children with asthma was studied by comparatively analyzing effects of family environmental factors on children with asthma and healthy children to provide a feasible basis for the psychological care. Family Environment Scale Chinese Version (FES-CV) was used conduct a questionnaire on the family environment of 40 children with asthma and 40 healthy children. Scores of the cohesion, emotional expression, successness, entertainment and organization of children in the asthma group were significantly lower than those in the control group, while scores of contradiction were higher than those in the control group. A relatively poor family environment could affect more in children with asthma compared with healthy children, suggesting that that more attention should be paid to the improvement of children’s families and a proper targeted psychological intervention should be given to the children.

Abstract: The aim of this study is to discuss the indoor environmental tobacco smoke impact on respiratory health among pre-school children. We chose 24 nursery schools randomly in four districts of Jilin city and distributed 658 questionnaires to the parents from 9/2013 to 12/2013. There is 62.6% of smoking family members, and only 3.4% of non-smoking family members. In smoking family members, there is 3.1% of smokers are mothers; the morbidity rate of respiratory decease among children is higher in smoking family than in non-smoking family, asthma, cough and wheezing are much higher, especially, but there is no significance of difference in other respiratory symptoms on statistics ( p>0.05 ).Family member who are smoking affects the respiratory health of pre-school children, and there is need to decrease the smoking rate of family member via health education through publicity.

Abstract: This paper summarize the existing method that can explain the lightning shield failing and put forward a new method to analyze the development of the leader and the upward leader. By using time-varying electromagnetic field analytical method. Solve the dynamic potential at the streamer zone in the bottom of leader. Give a simulation analysis for the dynamic potential and find the trend grow in exponential form. Deduce the electric field and the magnetic field from the dynamic potential in time-varying electromagnetic field.

Abstract: In this paper, the finite element (FE) method was used for simulation of the low-frequency sound field in high speed train compartments. The proposed model was validated using experimental results. The FE models of the train compartments with and without racks were established respectively, and the sound pressure level of the standard point and sound field distribution in these two cases were compared. The results showed that the A-weighted sound pressure level of the standard point was 1.2 dB lower when there is no rack in the compartment.

Abstract: Dam deformation is a multivariate complicated and nonlinear problem, it’s unable to establish accurate mathematical model.A dam deformation prediction model based on RBF neural network was constructed in this paper to enhance prediction accuracy. Three closely related factors in dam deformation are hydraulic components, temperature component and aging components ,they were selected as Input vector of RBF neural network, dam deformation measured value as a model target output. In Matlab 2011b simulation software,50 groups Fengman dam quantitative observation data from 2012 to 2013 as the sample data,45 groups were used in RBF neural network model training, other 5 groups were used in testing for the model. The simulation result shows that testing value is very close to the true value in this method, the average relative error close to 3%. Effectiveness of the dam deformation prediction based on RBF neural network is Verified by experiments.

Abstract: Creep landslide tunnel deformation is a diversity,changeability, less information, complicated nonlinear problem, it’s unable to establish accurate mathematical model.A creep landslide tunnel deformation prediction model based on SVM was constructed in this paper to enhance prediction accuracy, and penalty parameter c and Kernel function parameter g of SVM were optimized by genetic algorithms (GA).nine closely related factors in creep landslide tunnel deformation were selected as Input vector of SVM , creep landslide tunnel deformation measured value as a model target output. In Matlab 2011b simulation software,80 groups observation data from 2012 to 2013 of Laoyeling tunnel in Changchun to Hunchun highway of Jilin province as the sample data, 70 groups were used as training set, other 10 groups were used as testing set. The simulation result shows that testing value is very close to the true value in this method, the average relative error close to 2%. Effectiveness of the creep landslide tunnel deformation prediction based on GA_SVM model is verified by experiments.

Abstract: We employed a method based on pseudorandom sequence modulation to suppress the system noise and sunlight interference for in situ measurement of algae concentration. Based on the theory analysis of the pseudorandom sequence modulation method, we established a measurement system. The excitation light was modulated by m sequence. The induced modulated fluorescence was demodulated by AD630 and then narrow-band filtered by a two-order Butterworth low-pass filter. The practical experiment results show that the linear response correlation coefficients of the measurement system reach up to 0.999 weather in a low concentration range (0~10μg/L) or in the whole concentration range (0.5~100μg/L).

Abstract: Using the high performance liquid chromatography (HPLC) method, bifenthrin isomers can be split at a polysaccharide derivatives chiral stationary phase column, and two well distinguished peaks of bifenthrin isomers are obtained. The effects of mobile phase ratios, temperatures, and detection wavelengths on the separation results are discussed. The optimal chromatographic conditions are as follows: the mobile phase ratio is methanol: ammonium acetate salts = 80:20, the column temperature is 35°C, and the wavelength is set as 220 nm. Under the optimal conditions, the resolution of bifenthrin enantiomer can be as large as 3.0.

Abstract: HWasu Corporation produces an enormous amount of PVC acetylene gas to wash waste sulfuric acid every year, and the composition of waste acid impurity is complex. The stench restricts the reuse of waste sulfuric acid, This paper establishes the detection scheme which is divide int three parts,respectively: escaping of the exhaust gas, liquid slag washing and washing slag quantitative analysis.Burning waste acid solid content of 11.40%, light component is 97.18%, sulfuric acid content of 79.22%, after washing slag of weight percent is 7.30%, Washing liquid slag quality percentage of 4.10%.Escaping gases mainly contain acetylene, hydrogen chloride, sulfur oxide impurities. Washing slag liquids mainly contain phosphoric acid root, organophosphorus, chloride, calcium, magnesium,iron ions and sulfuric acid root ion. Washing slags mainly contain silicon dioxide, carbon, hydrogen, calcium oxide, magnesium oxide, ferric oxide,and etc. Finally through the balance calculation of data, We can figure out that the experimental data is accurate and reliable for comprehensive utilization of wast sulfuric acid to provide basic theory data.