are known numbers. The random variables ξi, i = 1, . . . , N , in (1.1) are nonobservable measurement errors. Below we impose some constraints on the limit behavior of the distributions of some linear combinations of these random variables. In this article we consider the problem of estimating the unknown vector θ with coordinates θj > 0, j = 1, . . . ,m, through the random variables Z1, . . . ...

Recently, Gasimov and Yenilmez proposed an approach for solving two kinds of fuzzy linear programming (FLP) problems. Through the approach, each FLP problem is first defuzzified into an equivalent crisp problem which is non-linear and even non-convex. Then, the crisp problem is solved by the use of the modified subgradient method. In this paper we will have another look at the earlier defuzzifi...

a simple and rapid method has been developed for the determination of ascorbic acid in fruit and pharmaceutical products. the method is based on the measurement of the reaction rate between ammonium molybdate and ascorbic acid in acidic media. the reaction was monitored spectrophotometrically at 800 nm by fixed-time and variable-time methods. the calibration graph was linear in the range of 5 0...

We regard linear elliptic equations with discontinuous diffusion coefficients in two and three space dimension with varying boundary conditions. The problem is discretized with linear Finite Elements. We propose the treatment of the arising singularities within an adaptive procedure based on a posteriori error estimators. Within this concept no a priori data like the degree of the singularity i...

In continuation to an earlier work, we further develop bounds on the mean-squared error (MSE) when estimating a deterministic parameter vector 0 in a given estimation problem, as well as estimators that achieve the optimal performance. The traditional Cramér–Rao (CR) type bounds provide benchmarks on the variance of any estimator of 0 under suitable regularity conditions, while requiring a prio...

-This paper summarizes the Voyager 1 and Voyager 2 orbit determination activity extending from encounter minus 60 days to the Jupiter encounter, and includes quantitative results and conclusions derived from mission experience. The major topics covered include an identification and quantification of the major orbit determination error sources and a review of salient orbit determination results ...

In this study, simple, fast and reliable cyclic voltammetry (CV), linear sweep voltammetry (LSV), square wave voltammetry (SWV) and differential pulse voltammetry (DPV) methods were developed and validated for determination of bosentan in pharmaceutical preparations. The proposed methods were based on electrochemical oxidation of bosentan at platinum electrode in acetonitrile solution containin...

Future space surveillance requires dealing with uncertainties directly in the initial orbit determination phase. We propose an approach based on Taylor differential algebra to both solve the initial orbit determination (IOD) problem and to map uncertainties from the observables space into the orbital elements space. This is achieved by approximating in Taylor series the general formula for pdf ...

Recently, several new tools and techniques have been developed to allow for robust detection and prediction of planetary encounters and potential impacts by near-Earth asteroids (NEAs). We review the recent history of impact-prediction theory and cover the classical linear techniques for analyzing encounters, which consists of precise orbit determination and propagation followed by target-plane...