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تعداد نتایج: 50698 فیلتر نتایج به سال:
a label-free electrochemical nucleic acid aptasensor for the detection of methamphetamine (ma) by the immobilization of thiolated self-assembled dna sequences on a gold nanoparticles-chitosan modified electrode is constructed. when ma was complexed specifically to the aptamer, the configuration of the nucleic acid aptamer switched to a locked structure and the interface of the biosensor changed...
In this paper we present a wearable positioning system that requires 2.5 mA to operate. The system consists of an infrastructure of ultrasonic transmitting devices, and a receiver device on the wearable. The receiver comprises an ultrasonic pick-up, an op-amp, and a PIC. The PIC implements a particle filter for estimating X and Y positions. The transmitter layout has been chosen to simplify the...
In this paper, we study the Ma–Trudinger–Wang (MTW) conditions for cost functions c which are of the form c = l ◦ d, where d is a Riemannian distance function with constant sectional curvature. In this case, the MTW conditions are equivalent to some computable conditions on the function l. As a corollary, we give some new costs on Riemannian manifolds of constant negative curvature for which th...
W" begin with three observations: . Methods for separating chemicals, materials, and objects are a crit ical part of chemical technology' . Magnetic interactions can achieve separations that are impossible or impractical to achieve l ' ,) ' other techniques. . Magnet ic separat ions are inf reqtrent ly used in chemistry. How is it that chemistry, which has cheerfully exploited separations based...
Our intelligent shopping assistant, Ma$$ive, is a web application for mobile phones that aims to help users with their everyday grocery shopping by offering features such as natural language shopping lists, product recommendations, special offers, recipes and in-shop navigation. This short paper briefly describes the current and planned features of Ma$$ive.
INTRODUCTION Epilepsy is common, with a lifetime prevalence of 2–5% of the general population (Goodridge & Shorvon 1983a; Goodridge & Shorvon 1983b, Shorvon 1990) and a point prevalence of between 4 and 8 per 1000 (Hauser et al. 1993). Epilepsy represents a signifi cant fraction of the workload for most neurologists, and indeed, never has specialist input been more necessary as the choice of an...
Necessary and sufficient conditions are given to guarantee associativity of algebras and co-algebras. As main application, it is discussed the associativity of the tensor algebra T (V ) of a free module V over any commutative ring R. 1. Review of basic definitions Recall that a vector space A, or more generally a (free) module over a commutative ring R is an R-algebra if a multiplication map mA...
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