the determination of soil wetting front which caused by emitters is one of the important issues in designing trickle irrigation system. in this study, a mathematical model introduced in order to study the position of soil wetting front during irrigation by point emitters in homegenious soil in unsteady condition. the model solves governing differential equation of unsaturated flow in cylindrica...

About thirty years ago, I suffered from severe back pain. For some weeks I lay in a body cast, dazed by pain-killers and muscle-relaxants. When I was recovering, I decided one day that I needed exercise. Very gingerly I got on my bike and, feeling rather sorry for myself, rode slowly up Mundy Pond Road. I drew abreast of a group of boys going home from school for lunch. One of them was holding ...

This paper extends the work of Markowitz (1952), Korkie and Turtle (2002) and others by first proving that the traditional estimate for the optimal return of self-financing portfolios always overestimates from its theoretic value. To circumvent the problem, we develop a bootstrap estimate for the optimal return of self-financing portfolios and prove that this estimate is consistent with its cou...

The last decades have been really hungry in new ways to reduce energy consumption. That is especially true when talking about wireless sensor networks in general and home multimedia networks in particular, since electrical energy consumption is the bottleneck of the network. One of the most energy-consuming functional block of an equipment is the radio front end, and methods to switch it off du...

The bootstrap is a popular and convenient method for quantifying the authority of an empirical ordering of attributes, for example of a ranking of the performance of institutions or of the influence of genes on a response variable. In the first of these examples, the number, p, of quantities being ordered is sometimes only moderate in size; in the second it can be very large, often much greater...

We propose a model of spectral contextual e ects to simulate the superior recognition ability of humans and apply it to a front-end processor for word spotting. This model assumes that perceived spectra are in uenced by adjacent spectral peaks and that the magnitude of the in uence can be estimated by the minimum classi cation error criterion. Three experiments were carried out to evaluate the ...

Electronic petition systems support participation in the democratic decision-making process. However, current petition systems often have serious drawbacks in reliability and anonymity. This paper presents PetAnon, a privacy-preserving petition system that tries to tackle the shortcomings of existing systems. A proof-ofconcept implementation is presented that uses the Belgian eID card in a boot...