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This paper studied the problem that standard teaching-learning-based optimization algorithm (TLBO) easily converges to local optima when solving combinatorial optimization, and proposed a simulated annealing TLBO(SATLBO) algorithm. In the method, it used the simulated annealing algorithm. Randomly selected a bit of the bad individuals according to a calculated possibility of simulated annealing algorithm to the new population in the teacher phase and learner phase. It increased the ability of running away from local optima of TLBO by increasing the diversity of the population. It simulated the unmultimodal functions, multimodal functions and rotation functions, and compared the results with some other evolutionary computation algorithms. The results indicate that the improved algorithm has good performance in terms of convergence speed and accuracy. [ABSTRACT FROM AUTHOR]

The resistance values of two layers directly coupled differential-common emitter voltage series negative feedback amplifying circuit are adaptively optimized by particle swarm optimization. In the method, the voltage gain, common-mode rejection ratio and the square root of the input resistance are multiplied, and the ratio between the product and the output resistance is used as the fitness function. The results indicate that the fitness function value will decrease under the constraint condition that alternating current index is limited. After increasing voltage gain and decreasing the output resistance are restricted, to derive the maximal fitness function value under the given condition, the voltage gain is as small as possible and the output resistance is as large as possible. Simulation results of the parameters with EWB software can meet the requirements of linear amplification. The results also indicate that the optimal parameters of circuit can be found by adjusting the fitness function. [ABSTRACT FROM AUTHOR]

A new indicator with temperature dependence of the NO3 loss frequency, was developed to study the contribution of NO3 to the oxidation of monoterpenes and NOx removal in the atmosphere. The new indicator arises from the temperature dependence of kinetic constant. The new indicator was applied to data of observation based on differential optical absorption spectroscopy system on the outskirts of Hefei, China. According to the findings, the contribution of monoterpenes to the loss of NO3 was 70%–80%. [ABSTRACT FROM AUTHOR]

We analyze the D→ππ decay channels at the leading order, αs corrections with the QCD factorization and the soft-gluon corrections with the light cone QCD sum rule. Comparing with the experimental result, the calculations of the D0→π+π- and D+→π+π0 decay are much better under the consideration of the contributions of factorization parts, αs corrections and soft-gluon effects. However, the calculation result is one order less than the experimental result in D0→π0π0 decay. It may have large effects of final state interaction in the decay channel. [ABSTRACT FROM AUTHOR]

Objective: To evaluate the diagnostic value of serum angiopoietin-2 (Ang-2) level in pancreatic cancer patients., Methods: Serum Ang-2 level was measured by enzyme-linked immunosorbent assays (ELISA) in samples from 116 patients with pancreatic cancer, 50 patients with chronic pancreatitis, and 50 normal control subjects., Results: The serum Ang-2 level in patients with pancreatic cancer [(1539.0 ± 449.3) ng/L] was significantly higher than those in patients with pancreatitis [(1044.6 ± 246.1) ng/L, P < 0.01] and normal control subjects [(1075.6 ± 228.2) ng/L, P < 0.01]. There was no significant difference of serum Ang-2 levels between patients with pancreatitis and normal controls. Pancreatic caner patients with lymph node metastasis had a significantly higher serum Ang-2 level [(1890.1 ± 354.9) ng/L] than those without metastasis [(1212.1 ± 224.2) ng/L, P < 0.01]. The area under ROC curve of serum Ang-2 level for diagnosis of pancreatic cancer was 0.819., Conclusion: The serum Ang-2 level can be a useful indicator for diagnosis of pancreatic cancer.

Due to heavy air pollutants and aerosols in our country, the model for simultaneous evaluation of aerosol parameters and trace gases based on differential optical absorption spectroscopy is developed in the present paper. The spectra were used to get the concentrations of many trace gases and mean geometrical diameter, total number concentration and total volume of aerosol simultaneously over the same air volume. Retrieval of aerosol parameters was performed by the "table look-up" method based on total extinction coefficient. Experimental results show that trace gases and aerosol parameters can be successfully retrieved using this model.