Báo cáo hóa học: " On the epidemiology of influenza" pdf

... demonstrable seasonal variations, population variations, and a mechanism of action. To make sense of influenza's epidemiology, we revise Hope-Simpson theory, hypothesizing marked variation in the infectivity ... Nations Health 1951, 41(7):796-805. 64. Kingston D, Lidwell OM, Williams RE: The epidemiology of the common cold. III. The effect of ventilation, air disinfect...

Ngày tải lên: 20/06/2014, 01:20

... However, the main goal of these studies was to identify the onset (and offset) of a specific neural activ- ity, with the aim of triggering stimulation. The aim of our work was to investigate the ability ... means of implanted interfaces with the peripheral nerves of the subject [12]. In the latter case, the choice of the electrode will make a difference on...

Ngày tải lên: 19/06/2014, 08:20

... exponent. Our aim in this article is to use a minimization method to establish some existence results o f solutions of (1.1). The idea of the proof is to transfer the problem of the existence of ... weak solutio n of (1.1). In order to complete the proof of Theorem 3.2, we will prove the uni queness of the weak solution. Let u 1 and u 2 be two weak solutions of p...

Ngày tải lên: 20/06/2014, 22:20

... EM: On the solutions of a class of difference equations systems. Demonstratio Mathematica. 41(1), :109–122 (2008) 32. Elsayed, EM: On the solutions of a rational system of difference equations. ... solutions of the system of rational difference equa- tions x n+1 = 1 y n−k , y n+1 = y n x n−m y n−m−k . In [9], Zhang et al. investigated the behavior of the positive s...

Ngày tải lên: 20/06/2014, 22:20

... that assumptions (2.2) an d (2.5) of Theorem 2.3 have been used only in the choice of the constant C (see (2.11)) and in the proof of Step 1. Hence, we now present only the proof of this part, the rest ... Theorem 2.5, by the same proof of Theorem 3.1. Theorem 3.3. Consider F(y)=|y| p-2 y, p >1,and let all the assumptions of Theorem 3.1 be satisfied with the exc...

Ngày tải lên: 20/06/2014, 22:20

... -1)[14].In the case of the Binary tree, the number of branches is doubled as the matrix size n increases, being the increasing number of nodes equal to 2 n+1 -1[15] .On the other hand and conversely, the ... that the search tree algorithm and the PBHM could have a similar perfor- mance,averyimportantaspecttoconsideristhatin the case of the first one, as the si...

Ngày tải lên: 21/06/2014, 00:20

... is a constant independent of u and f. Proof. From the assumptions on the regularities of the coefficients a pq and of the function f it follows that the solution (c N k (t )) N k = 1 of the system ... present the results on the unique exis- tence and the regularity in time of the generalized solution. The global regularity of the solution is dealt with...

Ngày tải lên: 21/06/2014, 00:20

... easy to show that the function f(x)=x 3 satisfies the functional equation (1.2), which is called a cubic functional equation and every solution of the cubic functional equation is said to be a ... additive-quadratic-cubic-quartic functional equa- tion, Hyers-Ulam stability 1. Introduction The stability problem of functional equations originated from a question of Ulam [1] in 194...

Ngày tải lên: 21/06/2014, 01:20

... improv- ing the predictive performance. Section 4 contains the description of our database and the results of the experi- ments. Section 5 has the discussion and the conclusions on the limitations of the ... curve confirmed the limited generalization because of the high depen- dence of samples used in validation, preventing effec- tively the prediction of T...

Ngày tải lên: 21/06/2014, 01:20

... inequality, related to Theorem 1.3. Further, we investigate the log-convexity and the exponential convexity of functionals defined as differences of the left-hand and the right-hand sides of these inequalities. ... refinements of the Jensen- Steffensen inequality. Further, we investigate the log-convexity and the exponential convexity of functionals defined via these i...

Ngày tải lên: 21/06/2014, 02:20