The Conditions of Maximum Increase Evanescent Waves near the Surface of the 1D Magnetic Photonic Crystal

It has been shown that the condition of the maximum increase of the intensity of TM or TE evanescent electromagnetic waves at the interface between the 1D magnetic photonic crystal and non-magnetic insulatorare exist

The magnetic field influence on magnetostructural phase transition in Ni2.19Mn0.81Ga

Magnetic properties of a polycrystalline alloy Ni$_{2.19}$Mn$_{0.81}$Ga, which undergoes a first-order magnetostructural phase transition from cubic paramagnetic to tetragonal ferromagnetic phase, are studied. Hysteretic behavior of isothermal magnetization $M(H)$ has been observed in a temperature interval of the magnetostructural transition in magnetic fields from 20 to 100 kOe. Temperature dependencies of magnetization $M$, measured in magnetic fields $H = 400$ and 60 kOe, indicate that the temperature of the magnetostructural transition increases with increasing magnetic field.Comment: Presented at the Second Moscow International Symposium on Magnetism (Moscow-2002

A composite functional material with shape memory effect exhibiting a giant reversible straining

A new design principle of a composite functional material on the basis of a material with shape memory effect has been proposed and tested in experiment. This design can be applied to the majority of traditional materials with shape memory effect (ferromagnetic and non-ferromagnetic alloys as well as for polymers) and it provides in all cases a giant reversible straining though the "one-way" shape memory effect is used only. This design is especially promising for applications in the fields of micro- and nano-electromechanical systems.Запропоновано та експериментально випробувано нову схему композитного функціонального матеріалу на основі матеріалу з ефектом пам'яті форми. Ця схема може бути застосована для більшості традиційних матеріалів з пам'яттю форми - феромагнітних та неферомагнітних сплавів, а також полімерів. У всіх випадках вона забезпечує гігантську оборотну деформацію, хоч використовується лише "односторонній" ефект пам'яті форми. Ця схема є особливо перспективною для застосування у галузі мікрота наномеханіки.Предложена и экспериментально испытана новая схема композитного функционального материала на основе материала с эффектом памяти формы. Эта схема может быть применена для большинства традиционных материалов с памятью формы - ферромагнитных и неферромагнитных сплавов, а также полимеров. Во всех случаях она обеспечивает гигантскую обратимую деформацию, хотя используется только "односторонний эффект памяти формы". Эта схема особенно перспективна для применений в области микро- и наномеханики

Study of nanostructured NiTi shape memory alloy’s structure and functional properties

The present work is aimed to study of nanostructured NiTi shape memory alloy’s structure and functional properties depending on the type of thermo mechanical treatment. Structure, recoverable strain and reactive force were compared for coarse grain alloys and nanostructured alloy which was prepared by equal chanal angular pressing. The structure of the nanostructured NiTi was studied by means of TEM. Functional properties were studied by three point bending method in wide temperature range. The processing of the alloy by equal canal angular pressing at 450C results in formation of the structure with mean grain size about 300 nm. The functional properties of nanostructured and coarse grain alloys were compared in terms of maximal recoverable strain, maximal reactive force, specific energy capacity and functional inflexibility. It was found that nanostructured alloy generates essentially higher maximal recoverable force, has higher specific energy capacity and functional inflexibility than coarse grain one deformed as well (up to 7%). These advantages are most favourable in the field of applications of the shape memory alloys to surgical or dental implant’s design

Application of nanostructural nickel titanium implants with shape memory effect to modern dental practice

The results of clinical treatment of severe periodontal diseases by application of the new functional implants based on nanostructural NiTi alloy with shape memory effect are presented. The nanostructure in NiTi alloy is attained by severe plastic deformation, particularly by equal channel angular pressing. Several new types of NiTi implants are developed, including dental implants (to replace the removed teeth) and trans radix implants (to enforce teeth and to attach teeth to the jaw bone). The surface of nanostructured NiTi implants is covered by the carbyne layer in order to ensure high bio-compatibility. The new treatment procedure is proposed which includes the injection into the jawbone tissue of the mixture based on powdered NiTi alloy. These injection implants will be incorporated into living bone tissue. The result will be the growth of the shell of the new healthy dense bone. The NiTi particles behave structurally similar to healthy bones, i.e. living tissue cells incorporate with them followed by small vessels and nerves. As a result the implants will not be rejected for a long time. The summary results of 3 years’ practice of the successful application of these new implantation system in dentistry are presented. The ease of implementation of the new NiTi dental shape memory implants and the ease at which they can be adopted to bone tissue, especially in cases where it’s in deficit are highlighte