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Journal of Applied Physics : Optically driven fluid flow along arb...

By: Franz M. Weinert and Dieter Braun

Description: We show how fluid can be moved by a laser scanning microscope. Selected parts of a fluid film are pumped along the path of a moving warm spot which is generated by the repetitive motion of an infrared laser focus. With this technique, we remotely drive arbitrary two-dimensional fluid flow patterns with a resolution of 2 μm. Pump speeds of 150 μm/s are reached in water with a maximal temperature increase in the local spot of 10 K. Various experiments confirm ...

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Journal of Mathematical Physics : Unitary isomorphism of Fock spac...

By: Katsunori Kawamura

Description: Bosons and fermions are described by using canonical generators of Cuntz algebras on any permutative representation. According to branching laws associated with these descriptions, a certain representation of the Cuntz algebra O2 induces Fock representations HB and HF of bosons and fermions simultaneously. From this, a unitary operator U from HB to HF is obtained. We show the explicit formula of the action of U on the standard basis of HB. It is shown that U...

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Biblioteca Hispanica : the Universe or God's Works Natural History...

By: Francisco Villabrille Fernandez
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Journal of Applied Physics : Magnetic cluster glass behavior and g...

By: B. Roy and S. Das

Description: The magnetic and transport properties of Nd0.7Ba0.3MnO3 nanoparticles were explored by transmission electron microscopy, x-ray powder diffraction, resistivity, magnetoresistance, thermopower (S), and magnetic measurements. The metal-insulator transition behavior of the temperature dependence of resistivity for the sample with the largest particle size changes to insulating nature with the decrease in the particle size due to the enhancement of the grain boun...

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Review of Scientific Instruments : A new tensile stage for in situ...

By: Kalin I. Dragnevski, Trevor W. Fairhead, Rik Balsod, and Athene M. Donald

Description: We have developed a novel tensile stage that can be used for in situ electron microscopy examination of the mechanical properties of “superelastic” materials. In our stage, one of the specimen clamps is replaced by a cylindrical roller, which when driven by a motor can easily stretch (“roll on”) any specimen irrespective of its plastic properties. We have used the so-called Roll-o-meter in the study of the tensile behavior of two different film formed latex ...

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Biblioteca Hispanica : Treaty Elemental Natural History

By: Mariano Water Monreal
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Physics of Plasmas : Consistent solution for space-charge-limited ...

By: Y. Feng and J. P. Verboncoeur

Description: The solution for space-charge-limited (SCL) currents in electron vacuum diodes with monoenergetic initial velocity is extended to the relativistic regime. Two types of solutions are found: Type I corresponds to zero steady state surface electric field (field emission with high enhancement factor), and Type II corresponds to a finite steady state surface electric field (other emission mechanisms). Our solution compares well to the classical space-charge-limit...

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Journal of Applied Physics : Vacancy generation during Cu diffusio...

By: M. Elsayed, V. Bondarenko, K. Petters, J. Gebauer, and R. Krause-Rehberg

Description: Positron lifetime and Doppler broadening spectroscopy were applied for a study of defect properties of semi-insulating GaAs after diffusion of copper. A 30 nm layer of Cu was deposited by evaporation to the undoped GaAs samples. The diffusion of Cu was performed during an annealing step at 1100 °C at different arsenic vapor pressures. The samples were quenched into room temperature water. The initial semi-insulating (SI) undoped GaAs sample shows no positron...

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Biblioteca Hispanica : Speech on the Importance of the Study of Na...

By: Joaquin Francisco Ballasts and Ruiz
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Applied Physics Letters : Effect of viscosity of base fluid on the...

By: Tsung-Han Tsai, Long-Sheng Kuo, Ping-Hei Chen, and Chin-Ting Yang

Description: This study aims to investigate the effect of viscosity of the base fluid on the thermal conductivity of nanofluids in which Fe3O4 nanoparticles are suspended in the base fluid composed of diesel oil and polydimethylsiloxane. Viscosity of the base fluid is varied by changing the volumetric fractions between both fluids. The measured thermal conductivity of nanofluids gradually approaches the value predicted by the Maxwell equation by increasing the viscosity....

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The Journal of Chemical Physics : Monte Carlo simulations of amphi...

By: Jonathan R. Davis and Athanassios Z. Panagiotopoulos

Description: Grand canonical Monte Carlo simulations on a cubic lattice are used to examine aggregation and phase separation of model amphiphiles with bulky head groups. The amphiphiles studied consist of a rigid, roughly spherical nanoparticle attached to one or more flexible chains. Overlapping distributions of energy and density are combined via histogram reweighting to obtain the free energy and osmotic pressure as a function of temperature and concentration. Finite ...

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Journal of Mathematical Physics : The classical point electron in ...

By: Andre Gsponer

Description: The electric and magnetic fields of a pole-dipole singularity attributed to a point-electron singularity in the Maxwell field are expressed in a Colombeau algebra of generalized functions. This enables one to calculate dynamical quantities quadratic in the fields which are otherwise mathematically ill-defined: the self-energy (i.e., “mass”), the self-angular momentum (i.e., “spin”), the self-momentum (i.e., “hidden momentum”), and the self-force. While the t...

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Chaos : Stability diagram for the forced Kuramoto model

By: Lauren M. Childs and Steven H. Strogatz

Description: We analyze the periodically forced Kuramoto model. This system consists of an infinite population of phase oscillators with random intrinsic frequencies, global sinusoidal coupling, and external sinusoidal forcing. It represents an idealization of many phenomena in physics, chemistry, and biology in which mutual synchronization competes with forced synchronization. In other words, the oscillators in the population try to synchronize with one another while al...

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Review of Scientific Instruments : High-resolution Rydberg tagging...

By: Brant Jones, Jingang Zhou, Lei Yang, and C. Y. Ng

Description: By coupling a comprehensive tunable vacuum ultraviolet (VUV) laser system to a velocity-mapped ion imaging apparatus, we show that high-resolution high-n Rydberg tagging time-of-flight (TOF) measurements of nascent atomic photofragments formed by laser photodissociation can be made using single-photon VUV laser photoexcitation. To illustrate this single-photon Rydberg tagging TOF method, we present here the results of the VUV laser high-n Rydberg tagging TOF...

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Journal of Applied Physics : Fluctuation-induced conductivity of p...

By: Najmul Hassan and Nawazish A. Khan

Description: The fluctuation-induced conductivity of Ni free and Ni doped Cu0.5Tl0.5Ba2Ca2Cu3−yNiyO10−δ (y = 0, 0.5, 1.0, 1.5) samples is investigated for comparison of dimensionality of fluctuations above the mean-field critical temperature. The temperature dependence of paraconductivity can be described by a power law following Aslamazov–Larkin (AL) type equations for these polycrystalline superconductors. It is observed from these studies that at higher temperatures, ...

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Biblioteca Hispanica : Notions of Natural History and General Idea...

By: Luis Perez Minguez
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Biblioteca Hispanica : Program a Course of Natural History That De...

By: Joseph Monlau and Sala
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Physics of Fluids : Electrokinetic flows over inhomogeneously slip...

By: Todd M. Squires

Description: Recent measurements and theory suggest that some solid/liquid surfaces can exhibit slip, at times to a surprising degree. Proposed mechanisms for slip include both intrinsic molecular slip as well as “effective” slip over complex and multiphase interfaces (i.e., covered with “lubricating” nanobubbles or trapped gas pockets). Electrokinetic flow velocities can be significantly enhanced over slipping surfaces as the high shear rates within the double layer dri...

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Biblioteca Hispanica : Rebuttals to Anti

By: Jose Gogorza and Gonzalez

Description: Evolutionism

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Journal of Applied Physics : Enhanced grain surface effect on magn...

By: P. Dey, T. K. Nath, P. K. Manna, and S. M. Yusuf

Description: We have investigated the effect of nanometric grain size on magnetic properties of La0.7Ca0.3MnO3 nanoparticles having average particle size (Φ) of ∼ 17 nm. Temperature dependence of field-cooled (FC) and zero-FC (ZFC) dc magnetization indicate the existence of two different types of relaxation processes: a relatively high temperature regime where there is a broad maximum of the ZFC curve at T = Tmax (>40 K) and another is a relatively low temperature regime...

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