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            <title xml:lang="en">Scalar  Problems in Junctions of Rods and a Plate. II Self-adjoint Extensions and Simulation Models</title>
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                <forename type="first">Renata</forename>
                <surname>Bunoiu</surname>
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                <forename type="first">Giuseppe</forename>
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                <forename>Renata</forename>
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            <funder>The work of S.A.N. was supported by grant 15-01-02175 of Russian Foundation for Basic Research. G.C. is a member of GNAMPA of INDAM.</funder>
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            <idno type="halRefHtml">&lt;i&gt;ESAIM: Mathematical Modelling and Numerical Analysis&lt;/i&gt;, 2018, 52 (2), pp.481-508. &lt;a target="_blank" href="https://dx.doi.org/10.1051/m2an/2017047"&gt;&amp;#x27E8;10.1051/m2an/2017047&amp;#x27E9;&lt;/a&gt;</idno>
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                <title xml:lang="en">Scalar  Problems in Junctions of Rods and a Plate. II Self-adjoint Extensions and Simulation Models</title>
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                    <forename type="first">Giuseppe</forename>
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                <term xml:lang="en">dimension reduction</term>
                <term xml:lang="en">self-adjoint extensions of differential operators</term>
                <term xml:lang="en">function space with detached asymptotics</term>
                <term xml:lang="en">scalar spectral problem</term>
                <term xml:lang="en">asymptotics</term>
                <term xml:lang="en">Junction of thin rods and plate</term>
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              <p>In this work we deal with a scalar spectral mixed boundary value problem in a spacial junction of thin rods and a plate. Constructing asymptotics of the eigenvalues, we employ two equipollent asymptotic models posed on the skeleton of the junction, that is, a hybrid domain. We, first, use the technique of self-adjoint extensions and, second, we impose algebraic conditions at the junction points in order to compile a problem in a function space with detached asymptotics. The latter problem is involved into a symmetric generalized Green formula and, therefore, admits the variational formulation. In comparison with a primordial asymptotic procedure, these two models provide much better proximity of the spectra of the problems in the spacial junction and in its skeleton. However, they exhibit the negative spectrum of finite multiplicity and for these “parasitic” eigenvalues we derive asymptotic formulas to demonstrate that they do not belong to the service area of the developed asymptotic models.</p>
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