The Influence of Montmorillonite Nanofillers on the Lung Surfactant

The influence of montmorillonite nanoparticles used as nanofillers in the production process of polymer nanocomposites on the physicochemical properties of the main lipid component of the lung surfactant was studied. Research was done for nanoparticles of natural and surface-modified montmorillonite using the Langmuir-Wilhelmy balance. It was found that montmorillonite nanofillers alter the organization of the surfactant molecules at the air-liquid interface and modify the surface properties of the surfactant monolayer. It may cause the disturbance of surface activity of the lung surfactant and contribute to adverse health effects in the respiratory system of workers involved in the production process. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3542

Spectral gap of segments of periodic waveguides

We consider a periodic strip in the plane and the associated quantum waveguide with Dirichlet boundary conditions. We analyse finite segments of the waveguide consisting of $L$ periodicity cells, equipped with periodic boundary conditions at the ``new'' boundaries. Our main result is that the distance between the first and second eigenvalue of such a finite segment behaves like $L^{-2}$.Comment: 3 page

Asymptotic behaviour of the spectrum of a waveguide with distant perturbations

We consider the waveguide modelled by a $n$-dimensional infinite tube. The operator we study is the Dirichlet Laplacian perturbed by two distant perturbations. The perturbations are described by arbitrary abstract operators ''localized'' in a certain sense, and the distance between their ''supports'' tends to infinity. We study the asymptotic behaviour of the discrete spectrum of such system. The main results are a convergence theorem and the asymptotics expansions for the eigenvalues. The asymptotic behaviour of the associated eigenfunctions is described as well. We also provide some particular examples of the distant perturbations. The examples are the potential, second order differential operator, magnetic Schroedinger operator, curved and deformed waveguide, delta interaction, and integral operator

Schrödinger operators with δ and δ′-potentials supported on hypersurfaces

Self-adjoint Schrödinger operators with δ and δ′-potentials supported on a smooth compact hypersurface are defined explicitly via boundary conditions. The spectral properties of these operators are investigated, regularity results on the functions in their domains are obtained, and analogues of the Birman–Schwinger principle and a variant of Krein’s formula are shown. Furthermore, Schatten–von Neumann type estimates for the differences of the powers of the resolvents of the Schrödinger operators with δ and δ′-potentials, and the Schrödinger operator without a singular interaction are proved. An immediate consequence of these estimates is the existence and completeness of the wave operators of the corresponding scattering systems, as well as the unitary equivalence of the absolutely continuous parts of the singularly perturbed and unperturbed Schrödinger operators. In the proofs of our main theorems we make use of abstract methods from extension theory of symmetric operators, some algebraic considerations and results on elliptic regularity

Generalized eigenfunctions and spectral theory for strongly local Dirichlet forms

We present an introduction to the framework of strongly local Dirichlet forms and discuss connections between the existence of certain generalized eigenfunctions and spectral properties within this framework. The range of applications is illustrated by a list of examples

Fibres for Sportswear

This book describes the differences between woven and knitted structures, provides an understanding of fabric behavior and the characteristics of a functional garment, and outlines the importance of garment fit and consumer perception of ..

Municipal and industrial waste - characteristics, hazards

Wraz ze wzrostem poziomu życia poważnym problemem stają się odpady powstające w wyniku działalności bytowej i przemysłowej człowieka. Szczególne zagrożenie stwarzają odpady, które w swoim składzie zawierają metale (w tym metale ciężkie) i ich związki. W artykule scharakteryzowano odpady komunalne i przemysłowe zawierające metale, zasady gospodarki odpadami i zagrożenia zdrowotne wywołane przez odpady niebezpieczne.With an increase in the standard of life municipal and industrial waste has become a serious problem. Waste that includes metals (including heavy metals) and their compounds are especially hazardous. This paper characterizes municipal and industrial waste, the principles of waste management and the effects dangerous waste has on our health

Exposure to metals and metal compounds in the glass industry

W artykule przedstawiono zagadnienia dotyczące występowania metali i związków metali w procesach produkcji wyrobów szklanych. Przybliżono historię wytwarzania szkła. Opisano etapy procesu produkcyjnego, klasyfikację szkła opartą na składzie chemicznym oraz rodzaje produktów wytwarzanych przez przemysł szklarski. Omówiono surowce zawierające metale i związki metali dodawane w procesie produkcyjnym w celu poprawienia właściwości użytkowych wyrobów szklanych, ale mogących stanowić też istotne zagrożenie dla zdrowia pracowników zatrudnionych przy produkcji wyrobów ze szkła.The paper presents issues related to metals and metal compounds in the glass industry. The history of glass manufacturing, stages of the assortment of products are covered. Raw materials containing metal and metal compounds added m order to improve the properties of glass products and possible health effects are discussed

Heavy metals – Benefits and hazards for the health and the environment

W artykule przedstawiono zagadnienia dotyczące występowania metali ciężkich w środowisku życia i pracy człowieka. Scharakteryzowano wybrane metale ciężkie niezbędne dla zdrowia człowieka oraz toksyczne metale ciężkie. Opisano objawy zatrucia wybranymi metalami ciężkimi oraz sposoby zapobiegania im.This paper presents issues related to heavy metals in residential and occupational environments. It characterizes both heavy metals essential for good health and toxic heavy metals. Symptoms of toxicological effects are presented and prevention of heavy metal poisoning is discussed