Allowable number of plasmons in nanoparticle
We address thermal and strength phenomena occurring in metal nanoparticles due to excitation of surface plasmons. The temperature of the nanoparticle is found as a function of the plasmon population, allowing for the Kapitza heat boundary resistance and temperature dependencies of the host dielectric heat conductivity and the metal electrical conductivity. The latter is shown to result in the positive thermal feedback which leads to appearance of the maximum possible number of plasmon quanta in the steady-state regime. In the pulsed regime the number of plasmon quanta is shown to be restricted from above also by the ponderomotive forces, which tend to deform the nanoparticle. Obtained results provide instruments for the heat and strength management in the plasmonic engineering.
Contrary to more advanced countries, Russia’s district heating hardly embraces radical innovations. Moving forward with breakthrough solutions, even if they have proven their effectiveness at leading European companies and are supported by federal and regional authorities, encounters significant obstacles. These obstacles include inflexible corporate management, including when interacting with customers, and inexperience in creating internal corporate startups and managing risks in the early stages of R&D. The authors review the innovation activity of heating companies, analyze the difficulties in adopting innovations, and compare the strategies and performance indicators of Russian and Finnish energy companies. Special emphasis is given to the Moscow district heating system. Analysis shows that its’ strategic development in the past decade has focused primarily on reframing the organizational set-up, not innovation. As a result, business processes and cash flows were largely streamlined but European level of productivity was not achieved. The creation of a single vertically integrated entity in Moscow’s energy industry has limited the ability to develop alternative district heating and cooling systems. Energy infrastructure innovation centres are sparse and feature limited specialization and competition. Large companies tend to follow the ‘closed innovation’ model where R&D activities are concentrated within an organization, and focus on incremental innovations while lagging in radical innovations in cogeneration and trigeneration. Under these conditions, short-term planning dominates, while mid- and long-term planning are virtually non-existent. The paper concludes with recommended measures to support the innovative development of Russian heating companies that can be split into institutional and corporate recommendations. The first group concerns stimulating competition in the heat supply market and creating a stable legal and investment environment. The second group calls for technological modernization, development of long-term corporate strategies that include investment programmes, systematic analysis of the best international practices for innovative development, and the formation of partner networks involving foreign innovative, consulting, and research centres.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.