Approach to the choice of modernization directions for the system of geodynamic monitoring in cases of using components intensity uncertainty

<p>The problem of the optimum choice of the modernization directions for geodynamic monitoring systems, which is solved in the conditions of changing the parameters of natural-technical systems (NTS) is considered in the work. The solution of the task is creating a list of the components modernization directions and validate ranking the most effective of them. As criterion of modernization the value of decrease in resource intensity of subsystem application is using. The task is considering the uncertainty of quantity of the arriving tasks. Within the suggested method, it is offered to determine the effect of resource by each modernization direction. The functional dependences on its increase depending on an expense of resources of modernization. The decision is reached by minimization of total cost of modernization resources for the system in the conditions of change using components intensity at change of external conditions.</p>

Boron Fullerenes (B40)—A Projecting Applicant for Molecular Devices: A Review

The field of molecular electronics has gained a great impetus in the recent times and made the fabrication of extremely small devices possible that demonstrates extraordinary electrical properties. Being superconductive, fullerenes have drawn concerted attention of the research community committed to the exploration of applications in the field of molecular electronics. After extensive research in the field of carbon fullerenes in the last decade, Boron based fullerenes have stolen the limelight for their inherent stability among fullerene group. While the properties of B80 fullerene are still under exploration, researchers have been successful in synthesizing all boron fullerenes B40 in the laboratory. B40 is distinctive from other known clusters of boron as it has extraordinary properties like high stability and comprises of both acidic and basic sites, making it an optimum choice for detecting a number of gases like hydrogen, ammonia and carbon dioxide. This paper gives a brief review about the properties of B40 and the comparative research done on Boron fullerene so far.

Some Remarks on Design of LED Lamps and their AC Direct Drivers

Many examples of capacitorless and inductorless drivers used to power LED lamps directly from the AC mains use complicated circuitry in the form of a dedicated integrated circuit which is designed for a particular multistring lamp in order to obtain the value of the power factor very close to 1 and high efficiency of the whole unit. However, the authors of such descriptions do not provide any details concerning the optimum choice of the number of strings in a LED lamp and the number of LEDs in each string. The aim of this work is to show that acceptable values of both electrical parameters mentioned above can be obtained using a LED lamp with just one or two strings. Some formulae and results of their numerical analysis for the 230 V 50 Hz mains are presented, thanks to which designers of LED lamps and their AC direct drivers may easily estimate the optimum conduction voltage of a LED string or the number of single LEDs in a string.