The theory of the scattering compression waves in viscous fluids is examined. effects fluid viscosity, differences density and elastic modulus between particles fluid, heat transfer concentration are considered. Ultrasonic phase velocity attenuation derived. Results for compared with several other formulations. feasibility using ultrasound to characterise suspensions discussed.

Abstract Heterostructures in the form of thin layers one material grown on a substrate have been subject intense study for several years. In case semiconductor systems aim is to grow epitaxial of, example, Si1-xGex Si, and devices based such structures are already use. Much known, as summarized this review, about stability against insertion dislocations, critical thicknesses up which strained layer stable. The effects dislocation nucleation dynamics motion lead strain relaxation metastable...

The magnetic coupling of flexible metal phthalocyanine (MPc) thin films can be modified depending on the polymorphic form adopted by crystals. A simple annealing procedure switch couplings from antiferromagnetic to ferromagnetic (MnPc) or paramagnetic (CuPc), opening up avenues for spintronic applications. Density functional and perturbation theories rationalize these trends attribute mechanism indirect exchange.

Targeted delivery of potent, toxic chemotherapy drugs, such as cisplatin, is a significant area research in cancer treatment. In this study, cisplatin was successfully encapsulated with high efficiency (>70%) poly (lactic-co-glycolic acid) polymeric nanoparticles by using electrohydrodynamic atomization (EHDA) where applied voltage and solution flow rate well the concentration polymer were varied to control size particles. Thus, produced three different drug:polymer ratios (2.5, 5 10wt%...

Type 2 diabetes mellitus (T2DM) is a chronic metabolic disease that increasingly common all over the world with high risk of progressive hyperglycemia and microvascular macrovascular complications. The currently used drugs in treatment T2DM have insufficient glucose control can carry detrimental side effects. Several drug delivery systems been investigated to decrease effects frequency dosage, also increase effect oral antidiabetic drugs. In recent years, use microbubbles biomedical...

Abstract This work explores the application of Allium sativum (Garlic) extract, in creation novel polymeric core‐sheath fibers for wound therapy applications. The pressurized gyration (CS PG) technology is utilized to mass‐produce with a polycaprolactone (PCL) core and polyethylene oxide (PEO) sheath, loaded garlic extract. produced maintain structural integrity, long‐term stability provide cell‐friendly surface rapid antibacterial activity. physical properties, morphology, therapeutic...

Finite element calculations of stresses and strains in substrates stripe films thickness h width 2l are reported. Both variation the stress vertical direction (away from interface) film distortion substrate taken into account. The show that both horizontal lattice planes curved as well substrate. If is infinite, curvature maximum near interface decays rapidly with depth. Furthermore, edges top over-relaxed, i.e., if originally under compression, becomes tensile because free edge surfaces...

Radiation damage in KCl can be produced by the decay of a self-trapped exciton into an F centre and H centre. The authors present calculations energies states involved for various stages evolution damage. These lead to important conclusions about very rapid process, support strongly Itoh Saidoh's suggestion (1973) that proceeds through excited hole state. results also help understanding prompt pairs at low temperatures, thermal annihilation centres, effects optical excitation exciton, some...

"The classical Stefan problem: basic concepts, modelling and analysis with quasi-analytical solutions methods." Contemporary Physics, 59(4), pp. 428–429

Polycaprolactone (PCL) is a widely used material in many applications to tackle health problems worldwide. Formed micro- or nanosized PCL particles and fibres benefit from higher surface area volume ratio are valuable those applications, thus there always push achieve smaller diameters. Electrohydrodynamic (EHD) technologies have been at the forefront production of polymeric biomaterials, pressurised gyration (PG) has also enhanced possibilities by its ability spin comparable rapid speeds....

Combining a hydrophobic polymer such as polycaprolactone (PCL) with hydrophilic polyethylene oxide (PEO) in binary system can enable range of novel applications biomedical engineering by permitting exceptional therapeutic release, antimicrobial possibilities, and heterogeneous tissue scaffolds. In this work, both PCL PEO were dissolved chloroform at 15 w/v % six different ratios to prepare solutions. The rheological properties the singular solutions measured, fibers spun using pressurized...

Abstract Electrospinning and pressurized gyration are two widely adopted methods for polymeric fiber production, valued their simplicity, versatility, relatively low environmental impact. Despite its advantages, electrospinning has notable limitations, including production efficiency significant safety concerns. Pressurized gyration, however, offers greater productivity a safer, more sustainable process, making it an excellent candidate industrial scaling. To fully realize this potential,...

Two semiempirical crystal orbital schemes are outlined for the calculation of properties perfect and defective solids. Both use periodic boundary conditions with a large unit cell (LUC) to map special points Brillouin zone onto point k=0. One method involves complete neglect differential overlap (LUC-CNDO), other uses intermediate (LUC-INDO). The determination parameter sets elements is discussed.

Abstract: Increasing the clinical efficacy of toxic chemotherapy drugs such as cisplatin (CDDP), via targeted drug delivery, is a key area research in cancer treatment. In this study, CDDP-loaded poly(lactic-co-glycolic acid) (PLGA) polymeric nanoparticles (NPs) were successfully prepared using electrohydrodynamic atomization (EHDA). The configuration was varied to control distribution CDDP within particles, and high encapsulation efficiency (>70%) achieved. NPs produced with either...

Three mechanisms by which edges induce stress relaxation in GeSi strained stripes are described and their relative importance is discussed. Relaxation of stresses the middle layers with l/h(=half-width/thickness) varying from 3 to 100 calculated including effect two important this range. The values manner agree our recent finite element calculations. Since orthogonal directions not equal since usually grown [110] direction on a (100) substrate, determination strain using Raman measurements...

For pt.I see ibid., vol.12, p.2487 (1979). Some properties of diamond and silicon crystals have been calculated using a large unit cell-complete neglect differential overlap (LUC-CNDO) crystal orbital approach. The dependence the predictions on parameter set chosen, size shape cell cut-off distance for atomic interactions has investigated. results obtained perfect solid with near-optimum are, in general, good agreement experimental values.

The authors report pseudopotential calculations for the relaxed exciton in alkali fluorides ahd chlorides, with emphasis on NaCl. These supplement earlier Hartree-Fock by permitting investigation of a number specific features. more extended and higher energy excitations electron associated are studied wider range host lattices crystal geometries considered. most important result is that origin sigma (singlet) pi (triplet) luminescence bands can be understood: two derive from different...

Polymer-coated pores play a crucial role in nucleo-cytoplasmic transport and number of biomimetic nanotechnological applications. Here we present Monte Carlo Density Functional Theory approaches to identify different collective phases end-grafted polymers nanopore study their relative stability as function intermolecular interactions. Over range system parameters that is relevant for nuclear pore complexes, observe two distinct phases: one with the bulk condensed at wall pore, other along...

In recent years, there has been a surge of interest in the design, processing, and use core-sheath fibres, especially production wound healing bandages drug delivery. this research, novel pressurised gyration technique was utilised to create antibacterial fibre patches (tetracycline hydrochloride, TEHCL) using polyvinyl pyrrolidone (PVP) polycaprolactone (PCL). Antibiotic showed uniform fibres with porous surface giving rise biphasic delivery system, which provided an initial burst 30–48%...

The authors describe a method for solving simultaneously the Hartree-Fock equations of motion in zero differential overlap approximation electronic structure molecule and dynamical its atoms. approach is similar to that Car Parrinello (1985) they optimize geometry simultaneously, but differs make chosen number iterations towards self-consistency at each rather than treating electron wavefunctions as variables. They give examples use calculate equilibrium geometries, dipole moments, molecular...

Describes a method for combining quantum mechanical treatment of cluster ions near point defect in an ionic crystal with self-consistent polarisation the surrounding perfect lattice, which is described by shell model. The authors discuss application this model to F+ centre MgO. They show that lattice effects are important accurate calculations optical absorption and emission. also demonstrate small clusters treated mechanically not adequate as description excited state since diffusion...