This paper provides an illustration of the principled design of an interactive learning environment. It provides a view of the early stages of this process where design, testing, and redesign are most critical. The long term goals of principled design are twofold: (1) to create a system that can be convincingly demonstrated as an effective and practical learning aid and (2) to provide a replica...

We consider the following stochastic partial differential equation: ∂u ∂t = 1 2 ∆u + κu ˙ F , for x ∈ R d in dimension d ≥ 3, where ˙ F (t, x) is a mean zero Gaussian noise with the singular covariance E ˙ F (t, x) ˙ F (t, y) = δ(t − s) |x − y| 2. Solutions u t (dx) exist as singular measures, under suitable assumptions on the initial conditions and for sufficiently small κ. We investigate vari...

We study the possibility of realizing perfect quantum state transfer in mesoscopic devices. We discuss the case of the Fano-Anderson model extended to two impurities. For a channel with an infinite number of degrees of freedom, we obtain coherent behavior in the case of strong coupling or in weak coupling off-resonance. For a finite number of degrees of freedom, coherent behavior is associated ...

One of the consequences of living in this century of machine and technology development is poverty in movement and reduction in physical activity. This study aimed to examine the predictive factors of physical activity in health volunteers based on the structures of Pender's health promotion model. This study was perform 80 health volunteers working at urban and rural health centers that were s...

As we tried to point out in our recent article (Anderson, Silverstein, Ritz, & Jones, 1977), the approximations we made there were oversimplifications of the complex reality of the nervous system—made so we could discuss only a few aspects of a very difficult problem. In Anderson et al. (1977), we considered a model that is partially linear. Whatever their theoretical shortcomings, linear syste...

Single-particle dynamics of the Anderson impurity model are studied using both the numerical renormalization group (NRG) method and the local moment approach (LMA). It is shown that a ‘two-self-energy’ description of dynamics inherent to the LMA, as well as a conventional ‘single-self-energy’ description, arise within NRG; each yielding correctly the same local single-particle spectrum. Explici...

teeth and t=permanent teeth) has been increasing from 1957 to 2015 years in iran. the current survey aimed to test the power of health promotion model for predicting the oral health behavior among high-school students.  materials and methods: a cross-sectional study was conducted on 482 high school students in gorgan city, iran. multi-cluster sampling was used to recruit the samples. a research...

reproductive behavior of 1525 pregnant woman were studied in the time of termination of pregnancy in relation to maternal age, education, prenatal care and the number of previous pregnancies. the results show that the frequency of maternal attendance at the centers of prenatal care is significantly related to maternal education. and the total pregnancies per woman are inversely correlated with ...