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292992571 Tangent structures and analytical mechanics.  
292992570 Complex search: aggregation, discovery, and synthesis/ Kompleksotsing: agregatsioon, avastamine ja suntees.  
Search engines such as Google, Bing, and Yahoo, supplemented by other information search portals like Wikipedia, have become the means for searching information on the Internet. Along with the...
292992569 Disturbance decoupling of multi-input multi-output discrete-time nonlinear systems by static measurement feedback/ Hairingu kompenseerimine mittelineaarsetest diskreetsetest mitme sisendi ja mitme valjundiga juhtimissusteemidest staatilise tagasisidega.  
This paper addresses the disturbance decoupling problem (DDP) for nonlinear systems, extending the results for continuous-time systems into the discrete-time case. Sufficient conditions are given...
292992568 Plasmochemical process for the production of niobium and tantalum nanopowders/Nioobiumi- ja tantaalinanopulbrite tootmine.  
Niobium and tantalum powders used in modern manufacturing are materials with nanostructure. The authors have studied and optimized the process of the production of niobium and tantalum nanopowders...
292992567 Raytraced images for testing the reconstruction of fibre orientation distributions/Fotorealistlikud pildid rekonstrueeritud luhikiudude orientatsiooni jaotuste testimiseks.  
The orientation distribution of fibres is relevant to the properties of a number of different kinds of fibrous materials from many fields like biology and engineering, including short fibre...
292992566 Generalized Langevin equation with multiplicative trichotomous noise/ Multiplikatiivse kolmetasemelise mura toime uldistatud Langevini vorrandis.  
The influence of noise flatness and memory-time on the dynamics of a generalized Langevin system driven by an internal Mittag-Leffler noise and by a multiplicative trichotomous noise is studied....
292992565 Assessment of natural radiation exposure from building materials in Estonia/ Ehitusmaterjalides leiduvatest looduslikest radionukliididest pohjustatud elanikudoosi hinnang.  
Radionuclides naturally occurring in building materials may significantly contribute to the annual doses of the public. As information on the radioactivity of such materials is lacking, the...
282824708 A Voronovskaya-type theorem for the second derivative of the Bernstein-Chlodovsky polynomials/Voronovskaja tuupi teoreem Bernsteini-Chlodovsky polunoomide teise tuletise kohta.  
This paper is devoted to a Voronovskaya-type theorem for the second derivative of the Bernstein-Chlodovsky polynomials. This type of theorem was considered for the Bernstein-Chlodovsky polynomials...
282824707 Comments on mesoscopic continuum physics: evolution equation for the distribution function and open questions/Selgitusi mesoskoopilise pideva keskkonna fuusika juurde: jaotusfunktsiooni evolutsioonivorrand ja lahtised kusimused.  
In mesoscopic continuum physics it is common to introduce a mesoscopic distribution function. Often also an evolution equation is derived for this distribution function. The mesoscopic balance...
282824706 On conformal geospatial transformations with complex polynomials/Konformsetest georuumilistest teisendustest komplekssete polunoomidega.  
We consider conformal reprojections of geographic information system data with complex polynomials as compared to reprojections with commercial software packages. We show that in regular cases...
282824705 Removal of radionuclides from Estonian groundwater using aeration, oxidation, and filtration.  
Groundwater in the north-eastern suburb of Tallinn was analysed to determine the content of iron, manganese, sulphides, ammonia, and radionuclides ([Ra.sup.226], [Ra.sup.228]) and total...
282824704 Ultrasonic on-line spectrophotometric system for reaction kinetic measurements/ Spektrofotomeetriline on-line-susteem reaktsioonikineetika uurimiseks ultraheli all.  
A unique ultrasonic online spectrophotometric system for kinetic measurements of homogeneous polar reactions under ultrasound was developed. The setup consists of an ultrasonic bath, an HPLC...
282824703 Integrated carbon nanotube fibre--quartz tuning fork biosensor/ Helihargi tuupi kvartsresonaatoriga integreeritud susiniknanotorufiibril baseeruv biosensor.  
We report on a novel label-free biosensor for in situ measurements in liquid. It is comprised of a porous carbon nanotube (CNT) fibre attached to one prong of a quartz tuning fork (QTF) resonator....
282824702 Morita invariants for partially ordered semigroups with local units/Lokaalsete uhikutega osaliselt jarjestatud poolruhmade Morita invariandid.  
We study Morita invariants for strongly Morita equivalent partially ordered semigroups with several types of local units. These include the greatest commutative images, satisfying a given...
282824701 On invariant submanifolds of trans-Sasakian manifolds/ Trans-Sasaki muutkonna invariantsetest alammuutkondadest.  
The object of the present paper is to find necessary and sufficient conditions for invariant submanifolds of trans- Sasakian manifolds to be totally geodesic. As a remark, particular cases of...
282824700 On an ([epsilon], [delta])-trans-Sasakian structure/([epsilon], [delta])-trans-Sasaki muutkondadest.  
In this paper we investigate ([epsilon], [delta])-trans-Sasakian manifolds which generalize the notion of ([epsilon])- Sasakian and ([epsilon])-Kenmotsu manifolds. We prove the existence of such...
282824699 Some characterizations of null osculating curves in the Minkowski space-time/Nullkooldumiskoverate iseloomustusest Minkowski aegruumis.  
In this paper we give the necessary and sufficient conditions for null curves in to be osculating curves in terms of their curvature functions. In particular, we obtain some relations between null...
275576209 On dispersion properties of surface motions in the Gulf of Finland/ Soome lahe pinnakihi hoovuste dispersioonist.  
The spreading rate of initially closely located water particles and passive drifters in the surface layer of the Gulf of Finland is studied using autonomous surface drifters. The average spreading...
275576208 Output signal based combination of two NLMS adaptive filters--transient analysis/Valjundsignaalidel baseeruv adaptiivsete NLMS-filtrite kombinatsioon: koonduvusanaluus.  
A combination of two complex normalized least mean square (NLMS) adaptive filters that adapt on the same input signal at the same time is investigated. One of the filters has a large and the other...
275576207 Generalized Sasakian space forms with semi-symmetric non-metric connections/Poolsummeetrilise mittemeetrilise seostusega uldistatud Sasaki ruumivormid.  
We introduce generalized Sasakian space forms with semi-symmetric non-metric connections. We show the existence of a generalized Sasakian space form with a semi-symmetric non-metric connection and...
275576206 Strong summability methods in a Riesz-type family/Tugeva summeeruvuse menetlused Rieszi tuupi peres.  
We continue our studies on Riesz-type families of summability methods for functions and sequences, started in Proc. Estonian Acad. Sci., 2008, 57, 70-80 and Math. Model. Anal., 2010, 15, 103-112....
275576205 Morita theorems for partially ordered monoids/Morita-teoreemid osaliselt jarjestatud monoidide jaoks.  
Two partially ordered monoids S and T are called Morita equivalent if the categories of right S-posets and right T- posets are Pos-equivalent as categories enriched over the category Pos of...
275576204 Some characterizations of Mannheim partner curves in the Minkowski 3-space [E.sup.3.sub.1]/Mannheimi partnerkoverate iseloomustus Minkowski 3-ruumis [E.sup.3.sub.1].  
In this paper, we give some characterizations of Mannheim partner curves in the Minkowski 3-space [E.sup.3.sub.1]. Firstly, we classify these curves in [E.sup.3.sub.1]. Next, we give some...
275576203 Approximation in variation by the Kantorovich operators/ Kantorovichi operaatoritega lahendamine variatsiooni mottes.  
We discuss the rate of approximation of the Kantorovich operators. The rate of approximation is given with respect to the variation seminorm.
268604063 Monitoring of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans, and polychlorinated biphenyls in Estonian food/Poluklooritud dibenso-p-dioksiinide, dibensofuraanide ja bifenuulide seire Eesti toidus.  
Persistent organic pollutants are mainly compounds that include chlorine, which are posing a threat to human health and impairing living organisms and ecosystems due to their toxicity,...
268604062 The effect of halide ions on nickel corrosion in perchloric acid solutions/Halogeniidioonide moju nikli korrosioonile perkloorhappelahuses.  
A comparative study of the effect of halide anions on the corrosion of mechanically and chemically polished nickel in perchloric acid solutions was carried out. Perchloric acid was chosen for the...
268604061 Some comments on the theory of short fibre reinforced materials/Kommentaare luhikeste kiududega armeeritud materjalide teooriale.  
The orientation of fibres in short fibre reinforced materials is essential for the properties of the composite. It is state of the art to use an orientation number to estimate how many fibres are...
268604060 A note on the relationship between single- and multi-experiment observability for discrete-time nonlinear control systems/Uhel ja mitmel eksperimendil pohinevate vaadeldavuse definitsioonide vahelisest seosest diskreetajaga mittelineaarsete susteemide jaoks.  
The connection between the concepts of the single-experiment and the multi- experiment unobservability of a nonlinear discrete-time control system is studied. The main result claims that if the...
268604059 Para-hyperhermitian structures on tangent bundles: dedicated to the memory of Professor Stere Ianus (1939-2010)/Para- huperhermiitilised struktuurid puutujakihtkondadel.  
In this paper we construct a family of almost para-hyperhermitian structures on the tangent bundle of an almost para-hermitian manifold and study its integrability. Also, the necessary and...
268604058 Necessary conditions for inclusion relations for double absolute summability/ Kahekordsete ridade maatriksmenetluste absoluutse sisalduvuse tarvilikud tingimused.  
We establish necessary conditions for a general inclusion theorem involving a pair of doubly triangular matrices. As corollaries we obtain inclusion results for some special classes of doubly...
268604057 On infinitesimal holomorphically projective transformations on the tangent bundles with respect to the Sasaki metric/Infinitesimaalsetest holomorfselt projektiivsetest teisendustest Sasaki meetrika suhtes puutujavektorkondadel.  
The purpose of the present article is to find solutions to a system of partial differential equations that characterize infinitesimal holomorphically projective transformations on the tangent...
268604056 Properties of TQ-algebras/TQ-algebrate omadusi.  
Several properties of unital left (right) TQ-algebras are described. The conditions when a unital semitopological algebra is a left (right) TQ-algebras are given. It is shown that the space M(A)...
258241640 Tangent structures and analytical mechanics/ Puutujastruktuurid ja analuutiline mehaanika.  
We establish a link between the sector-forms of White and the exterior forms of Cartan. We show that the Hamiltonian system on [T.sup.2]M reduces to Lagrange's equations on the osculating...
258241639 Approximation in variation by the Meyer-Konig and Zeller operators/Meyer-Konigi ja Zelleri operaatoritega lahendamine variatsiooni mottes.  
The convergence in variation and the rate of approximation of the Meyer-Konig and Zeller operators are discussed. It is proved that for absolutely continuous functions the rate of approximation...
258241638 On determinability of idempotent medial commutative quasigroups by their endomorphism semigroups/Idempotentsete mediaalsete kommutatiivsete kvaasiruhmade maaratavusest oma endomorfismipoolruhmadega.  
We extend the result of P. Puusemp (Idempotents of the endomorphism semigroups of groups. Acta Comment. Univ. Tartuensis, 1975, 366, 76-104) about determinability of finite Abelian groups by their...
258241637 Ford lemma for topological *-algebras/Fordi lemma topoloogiliste *-algebrate korral.  
Several analogies of Ford lemma for topological algebras (in particular, for topological *-algebras) are proved (without using projective limits). Topological *-algebras, in which a...
258241636 Calculating the output signal parameters of a lactose bienzymatic biosensing system from the transient phase response/Laktoosi biosensori valjundsignaali parameetrite arvutamine tasakaalueelsetest andmetest.  
We constructed for the determination of lactose a bienzymatic biosensing system based on a fibre-optical oxygen sensor and two enzymes--[beta]-galactosidase ([beta]-gal, from Aspergillus...
258241635 Static state feedback linearizability: relationship between two methods/ Lineariseeritavus staatilise olekutagasisidega: kahe meetodi vahelised seosed.  
The paper establishes the explicit relationship between two sets of necessary and sufficient conditions for static state feedback linearizability of a discrete-time nonlinear control system. A...
258241634 A study on generalized absolute summability factors for a triangular matrix/Kolmnurksete maatriksmenetluste uldistatud absoluutse summeeruvuse teguritest.  
In this paper, we establish a summability factor theorem for summability [[absolute value of A, [delta]].sub.k]. This paper is an extension of the main result of Savas, E. A study on...
258241633 Convergence of the p-Bieberbach polynomials in regions with zero angles/ p-Bieberbachi polunoomide uhtlane koonduvus nulliliste nurkadega piirkondades.  
Uniform convergence of the p-Bieberbach polynomials is proved in the case of a simply connected region bounded by a piecewise quasiconformal curve with certain interior zero angles on the...
252848124 A new method for the synthesis of 3-hydrazinopropyl trimethoxysilane/ Uus meetod 3-hudrasinopropuultrimetoksusilaani sunteesiks.  
A new method for the synthesis of 3-hydrazinopropyl trimethoxysilane is proposed. The method is relatively simple and is based on hydrosilylation like the synthesis of analogous aminosilanes. For...
252848123 Content and composition of essential oils in some Asteraceae species/ Eeterliku oli sisaldus ja koostis monedes Asteraceae sugukonna taimeliikides.  
The content and composition of the essential oils of five Asteraceae species from Estonia were studied. The oil yields ranged from traces up to 0.2%. By using GC-FID and GC-MS methods a total of...
252848122 Model checking of emergent behaviour properties of robot swarms/ Robotiparvede ilmneva kaitumise mudelkontroll.  
This paper presents a case study on scalability of explicit state model checking. Three state space reduction methods--state vector compression, bit state hashing, and symmetry reduction--were...
252848121 Robust state controller via reflection coefficient assignment/Robustse olekuregulaatori suntees peegelduskoefitsientide kaudu.  
A solution to the robust pole assignment problem via reflection coefficients of polynomials is provided for discrete-time single-input single-output (SISO) and multi-input multi-output (MIMO)...
252848120 On submersivity assumption for nonlinear control systems on homogeneous time scales/Submersiivsuse eeldusest mittelineaarsete juhtimissiisteemide jaoks homogeensetel ajaskaaladel.  
The paper derives a condition that allows construction of the a-differential fields for nonlinear control systems, described by the set of input-output (i/o) higher-order delta-differential...
252848119 A strong convergence theorem on generalized equilibrium problems and strictly pseudocontractive mappings/Tugev koonduvusteoreem uldistatud tasakaalu iilesannete ja rangelt pseudoahendavate kujutuste kohta.  
In this paper, we consider a general iterative process for a generalized equilibrium problem and a strictly pseudocontractive mapping. A strong convergence theorem of common elements of the...
252848118 On pseudo-slant submanifolds of trans-Sasakian manifolds/Trans-Sasaki muutkondade pseudo-langus alammuutkondadest.  
The object of the present paper is to study pseudo-slant submanifolds of trans-Sasakian manifolds. Integrability conditions of the distributions on these submanifolds are worked out. Some...
244159107 Transformations of semiholonomic 2- and 3-jets and semiholonomic prolongation of connections/Poolholonoomsete 2- ja 3-dzettide teisendused ning seostuste poolholonoomne jatkamine.  
We recall the description of natural transformations of semiholonomic jet functors [[bar.J].sup.r] defined on the categories M [f.sub.m] x M f and F [M.sub.m,n]. Up to order three, exact...
244159106 Finding a class of 2-groups/Uhe 2-ruhmade klassi leidmine.  
Let n [greater than or equal to] 3 be an integer and [C.sub.m] denote a cyclic group of order m. All groups which can be presented as a semidirect products ([MATHEMATICAL EXPRESSION NOT...
244159105 Group actions, orbit spaces, and noncommutative deformation theory/Ruhmatoimed, orbiitruumid ja mittekommutatiivne deformatsiooniteooria.  
Consider the action of a group G on an ordinary commutative k-variety X = Spec (A). In this note we define the category of A-G-modules and their deformation theory. We then prove that...

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