Quantum Non-Markovian Stochastic Equations

We derive quantum diffusion equations with transport coefficients explicitly depending on time from generalized non-Markovian Langevin equations and obtain generalized fluctuation-dissipation relations. We substantiate the axiomatic Lindblad approach in the microscopic model. For non-Markovian dynamics, we find sets of diffusion coefficients that ensure the purity of states at any instant. __________ Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 145, No. 1, pp. 87–101, October, 2005.     

Adaptive homodyne measurement of optical phase

We present an experimental demonstration of the power of feedback in quantum metrology, confirming the predicted [H. M. Wiseman, Phys. Rev. Lett. 75, 4587 (1995)]] superior performance of an adaptive homodyne technique for single-shot measurement of optical phase. For measurements performed on weak coherent states with no prior knowledge of the signal phase, adaptive homodyne estimation approaches closer to the intrinsic quantum uncertainty than any previous technique. Our results underscore the importance of real-time feedback for reaching quantum limits in measurement and control.     

General theory of thin plates on the basis of nonsymmetric theory of elasticity

The paper uses the asymptotically justified hypothesis method to construct three different general refined theories of micropolar thin elastic plates, depending on the values of physical dimensionless material parameters, involving: (i) independent displacement and rotation fields, (ii) constrained rotation, and (iii) low shear stiffness. All angular shear deformations are taken into account.     

General dynamic theory of micropolar elastic thin plates with free rotation and special features of their natural oscillations

A general applied two-dimensional theory for the dynamics of micropolar elastic thin plates that takes into account rotationally shear and related deformations is developed on the basis of the method of hypotheses with asymptotic confirmation. A problem of natural oscillations of micropolar elastic thin rectangular plates is solved using it. Special features of the dynamic characteristics of elastic thin plates made of a micropolar elastic material are revealed within the framework of numerical analysis.     

Dynamic model of micropolar elastic thin plates with independent fields of displacements and rotations

A general model of dynamic bending of isotropic micropolar elastic thin plates with independent fields of displacements and rotations is presented. The model has been justified asymptotically based on the solutions for special cases subject to simplifying assumptions. The model incorporates transverse shear deformations. Neglecting transverse shear, a model of the dynamics of micropolar elastic thin plates is also constructed. Then, we study free and forced oscillations and derive the natural frequencies, the amplitudes of the forced oscillations and the resonance conditions for micropolar elastic hinge-supported rectangular and circular plates. Finally, the basic characteristic features of micropolar plates are numerically analysed for different values of various elastic and inertial constants of the micropolar material.     

Osteoporosis detection in postmenopausal women using axial transmission multi-frequency bone ultrasonometer: Clinical findings

The objective of this study was to evaluate if the Bone UltraSonic Scanner (BUSS) can detect osteoporosis in postmenopausal women. BUSS is an axial transmission multi-frequency ultrasonometer for acquisition of wave propagation profiles along the proximal anterior tibia. We derived 10 diagnostically significant BUSS parameters that were then compared with the DXA spine T-score, which was used in this study as the “gold standard” for the assessment of osteoporosis (T-score <−2.5). BUSS wave parameters were studied in 331 postmenopausal women examined by 9 trained operators at 3 clinical sites with use of 3 devices. The efficiency of each BUSS parameter in osteoporosis detection was assessed using a receiver operating characteristic curve analysis. Area under the curve (AUC) for each of 10 parameters ranged from 58.1% to 70.2%. Using these parameters a linear classifier was derived which provided at its output 83.0% AUC, 87.7% sensitivity and 63.2% specificity to DXA-identified osteoporosis. The results of this study confirm BUSS’s capability to detect osteoporosis in postmenopausal women.     

Near-field scanning microwave microscope application on Cu-phthalocyaninethin-film organic field-effect transistor

By the standard vacuum evaporation technique Cu(II)-phthalocyanine (Cu-Pc) thin films have been fabricated. For the samples, prepared at room temperature and post-annealed from 100°C to 350°C temperatures, optical spectra in the visible and near IR ranges have been measured. By using nondestructive near-field scanning microwave microscopy organic field-effect transistor (OFET) based on Cuphthalocyanine thin films have been investigated. The changes of crystal structure of Cuphthalocyanine thin film from the α- to the β-phase were controlled by the temperature of annealing. The values of holes’ mobility and the electroconductivity of Cu-phthalocyanine thin films have been obtained depending on the annealing temperature.     

Synthesis of new biheterocycles containing a 1,4-benzodioxane fragment

The reaction of 1,4-benzodioxane-2-carbonyl chloride with 5-(4-aminophenyl)-1,3,4-oxa- and -thiadiazole-2-thiols afforded new biheterocyclic compounds which were converted into the corresponding S-benzyl derivatives by treatment with benzyl chloride. 5-(4-Aroylaminophenyl)-1,3,4-oxa(thia)diazole-2-thiols reacted with 2-bromomethyl-1,4-benzodioxane to give compounds in which the 1,4-benzodioxane nucleus and fivemembered heterocycle are linked through a CH₂S bridge.