Abstract Multilinear regression has been used extensively to predict soil hydraulic properties, both the θ( h ) and K ( relationships, from easily obtainable variables. As an alternative, this study investigated performance of artificial radial basis neural network in predicting some values other This kind may be seen as a multivariate interpolation technique, which can theoretically fit any nonlinear continuous function. Neural networks are characterized by parameters that must optimized...

The segregation of large spheres in a granular bed under vertical vibrations is studied. In our experiments, we systematically measure rise times as function density, diameter, and depth, for two different sinusoidal excitations. measurements reveal that, at low frequencies, inertia convection are the only mechanisms behind segregation. Inertia (convection) dominates when relative density greater (less) than one. At high where suppressed, fluidization causes either buoyancy or sinkage occurs.

Energetic collisions of subatomic particles with fixed or moving targets have been very valuable to penetrate into the mysteries nature. But are quite intriguing when projectiles and macroscopically immense. We know that countless debris wandering in space impacted (and still do) large asteroids, moons planets; millions craters on their surfaces traces such collisions. By classifying studying morphology craters, geologists astrophysicists obtain important clues understand origin evolution...

An object falling in a fluid reaches terminal velocity when the drag force and its weight are balanced. Contrastingly, an impacting into granular medium rapidly dissipates all energy comes to rest always at shallow depth. Here we study, experimentally theoretically, penetration dynamics of projectile very long silo filled with expanded polystyrene particles. We discovered that, above critical mass, and, therefore, endless penetration.

With antibiotic resistance increasing in the global population every year, efforts to discover new strategies against microbial diseases are urgently needed. One of therapeutic targets is bacterial cell membrane since, event a drastic alteration, it can cause death. We propose utilization hydrophobic molecules, namely, propofol (PFL) and cannabidiol (CBD), dissolved nanodroplets oil, effectively strike two well-known pathogens: Escherichia coli Staphylococcus aureus. First, we carried out...

An object moving in a fluid experiences drag force that depends on its velocity, shape and the properties of medium. From this simplest case to motion flock birds or school fish, forces hydrodynamic interactions determine full dynamics system. Similar appear when single projectile impacts moves through granular medium, is well studied literature. On other hand, which group intruders impact material has never been considered. Here, we study simultaneous penetration several very low-density We...

Impact experiments in granular media are usually performed with solid projectiles that do not fragment at all. Contrastingly, we study here the morphology produced by impact of spherical whose structure is utterly lost after collision. Simple and complex craters observed, depending on packing fraction balls. Their diameters D depths z analyzed as a function drop height h. We find same power law ∝ h(1/4) obtained spheres, but discontinuity certain threshold height, related to cohesive energy...

A method for object recognition that is invariant under translation, rotation and scaling addressed. The first step of the (pre-processing) takes into account properties normalized moment inertia a novel coding extracts topological characteristics. second (recognition) achieved by using holographic nearest-neighbor (HHN) algorithm, in which vectors obtained pre-processing are used as inputs to it. algorithm tested character recognition, 26 upper-case letters alphabet. Only four different...

Compaction from a random-loose-packed to random-close-packed phase is observed when monodisperse granular beds are shaken, but beyond this packing, the system freezes up in jammed structure. Here we report technique grow large hard-sphere crystals, with perfect stacking and no defects by means of ``gas phase'' epitaxial procedure. We study growth mechanism provide evidence that crystallization driven gravity energy dissipation.

Atomic-beam diffraction and molecular-dynamics calculations have been combined to study the structures of overlayers dipolar molecules C${\mathrm{H}}_{3}$F C${\mathrm{H}}_{3}$Cl physisorbed on bare xenon-plated graphite crystals. On former substrate, adopts a commensurate triangular lattice with one molecule per unit cell, whereas latter cell doubles. both substrates is incommensurate antiferroelectrically ordered arranged in uniaxially distorted structure.

We fluidize a granular bed in rectangular container by injecting energy through the lateral walls with high-frequency sinusoidal horizontal vibrations. In this way, is brought to steady state no convection. measured buoyancy forces on light spheres immersed and found that they obey Archimedes' principle. The decrease when we reduce injected energy. By measuring ascension velocities as function of $\ensuremath{\Gamma}$, can evaluate frictional drag bed; its exponential dependence agrees very...

In order to address the problem of three-body interactions in gas–surface scattering, we considered collision a He atom with (0001) surface graphite coated by monolayer Xe. To eliminate uncertainties connected errors two-body He–Xe interaction, determined latter crossed-beam differential cross-section measurements performed at two energies (67.2 and 22.35 meV). These scattering data together room-temperature bulk diffusion are then fitted Hartree–Fock–dispersion–type function yield an...

Some materials remain solids even if they are heated beyond the temperature of their melting points. In condensed matter physics, this rare phenomenon is called superheating. Here we report analogous in granular matter: a strongly vibrated monolayer that instead being gas persists as crystal for some time. Eventually, it spontaneously evaporates. We found system has thermodynamiclike features like coexistence and metastability. show how observed metastable phase linked to energy dissipation.

Abstract Hundreds of substances possess anesthetic action. However, despite decades research and tests, a golden rule is required to reconcile the diverse hypothesis behind anesthesia. What makes an be local or general in first place? The specific targets on proteins, solubility lipids, diffusivity, potency, action time? Here we show that there could new player equally even more important disentangle riddle: protonation rate. Indeed, such rate modulates diffusion speed anesthetics into lipid...

Abstract Brownian or self-propelled particles in aqueous suspensions can be trapped by acoustic fields generated piezoelectric transducers usually at frequencies the megahertz. The obtained confinement allows study of rich collective behaviours like clustering spreading dynamics microgravity-like conditions. field induces levitation and provides secondary lateral forces to capture them nodal planes. Here, we give a step forward confined active matter, reporting experiments bacterial...

The rise dynamics of a large particle, in granular bed under vertical vibrations, is experimentally studied with an inductive device designed to track the particle while it climbs through granulate different conditions. A model based on energy considerations presented explain our experimental data, drawing important conclusion that inertia assisted by Reynolds dilatancy, driven force behind its ascension mechanism. reveals friction profile within column which remains unchanged for accelerations.

We introduce an experimental method to crystallize ensembles of non-Brownian spheres confined in narrow containers. The is based on programed vibrations and a cooling procedure (annealing). Starting with granular gas, the system slowly relaxes into solid ordered structure: Body-centered-tetragonal face-centered-cubic single crystals are obtained depending dimensions capillaries. Dry lubricated beads behave differently, indicating that sticking coefficient between particles important dynamics...

Chromatography is, at present, the most used technique to determine purity of alcoholic drinks. This involves a careful separation components liquid elements. However, since this requires sophisticated instrumentation, there are alternative techniques such as conductivity measurements and UV-Vis infrared spectrometries. We report here method based on salt-induced crystallization patterns formed during evaporation drops. found that droplets different samples form structures upon drying, which...

Self-assembled nanostructures derived from lipids and polymers are investigated as potential drug delivery vehicles in nanomedicine.

Experiments and computational simulations are carried out to study the behavior of a granular column in silo whose walls able vibrate horizontally. The is brought steady fluidized state it behaves similar hydrostatic system. We dynamics discharge through openings at bottom order search for Torricelli-like behavior. show that flow rate scales with wall induced shear rate, high rates, bed indeed discharges viscous fluid.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-energy helium scattering from ordered physisorbed layers of polar moleculesP. A. Rowntree, G. Scoles, and J. C. Ruiz-SuarezCite this: Phys. Chem. 1990, 94, 23, 8511–8522Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://pubs.acs.org/doi/10.1021/j100386a007https://doi.org/10.1021/j100386a007research-articleACS PublicationsRequest reuse permissionsArticle...

We study how zwitterionic and anionic biomembrane models interact with neurotransmitters (NTs) anesthetics (ATs) in the presence of Ca(2+) different pH conditions. As NTs we used acetylcholine (ACh), γ-aminobutyric acid (GABA), l-glutamic (LGlu). ATs, tetracaine (TC), pentobarbital (PB) were employed. By using differential scanning calorimetry (DSC), analyzed changes such molecules produce thermal properties membranes. found that calcium play important roles interactions ATs lipid Changes...

We demonstrate, experimentally and by molecular dynamics simulations, that krypton xenon form nanostructured water-gas domains. High pressure was applied to force the inert gases dissolve in water following Henry's law, then liquid depressurized, centrifuged, inspected dynamic light scattering. The observed objects have similar sizes electrical properties nanobubbles, but we found they fairly neutral buoyancy even at high gravitational fields. posit formed nano are not bubbles blobs, unique...

We evaluate, theoretically, the solar absorptance and thermal emittance of cermets with large particles. In particular, we consider Co Ni particles radii from 0.05 to 0.13 µm, embedded in binders alumina silica, respectively. For these particle sizes, it is necessary effect multiple scattering light material for visible near infrared parts spectrum. The response calculated using Lorenz-Mie theory, effects are taken into account through a four-flux radiative transfer model. medium infrared,...