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Review of Scientific Instruments : Improvement of temporal resolut...

By: Hideo Sato-Akaba, Hirotada Fujii, and Hiroshi Hirata

Description: This paper describes improved temporal resolution for three-dimensional (3D) continuous-wave electron paramagnetic resonance (EPR) imaging. To improve temporal resolution, the duration of magnetic filed scanning that is used to obtain an EPR spectrum for each projection was reduced to 40 ms. The Helmholtz coil pair for field scanning was driven by triangular waves. The uniform distribution of projections was also used to reduce the number of projections for ...

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Journal of Applied Physics : Nanoindentation-induced plastic defor...

By: Z. H. Sun and K. W. White

Description: The plastic deformation and fracture behavior of individual a- and c-domains of (001) oriented BaTiO3 single crystal are studied with nanoindentation and atomic force microscopy. Consistent with previous observations in rocksalt and perovskite crystals, square-shaped pileups directly surround the residual indents, and rosette arm patterns extend beyond these pileups. These features have been ascribed to dislocation activities on the {110}〈10〉 slip systems in...

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Physics of Plasmas : Acoustic solitary waves in dusty and/or multi...

By: Frank Verheest, Manfred A. Hellberg, and Ioannis Kourakis

Description: Large nonlinear acoustic waves are discussed in a four-component plasma, made up of two superhot isothermal species, and two species with lower thermal velocities, being, respectively, adiabatic and cold. First a model is considered in which the isothermal species are electrons and ions, while the cooler species are positive and/or negative dust. Using a Sagdeev pseudopotential formalism, large dust-acoustic structures have been studied in a systematic way, ...

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Chaos : Pinning synchronization of delayed neural networks

By: Jin Zhou, Xiaoqun Wu, Wenwu Yu, Michael Small, and Jun-an Lu

Description: This paper investigates adaptive pinning synchronization of a general weighted neural network with coupling delay. Unlike recent works on pinning synchronization which proposed the possibility that synchronization can be reached by controlling only a small fraction of neurons, this paper aims to answer the following question: Which neurons should be controlled to synchronize a neural network? By using Schur complement and Lyapunov function methods, it is pro...

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Journal of Applied Physics : Energy and angle spectra of sputtered...

By: P. S. Krstic, C. O. Reinhold, and S. J. Stuart

Description: We study the translational, vibrational, and rotational energy spectra of atoms and molecules reflected or sputtered from deuterated amorphous carbon surfaces by impact of low-energy (1–30 eV) deuterium atoms. Both the rovibrational and translational energies of sputtered deuterium molecules are found to be close to 1 eV over the whole impact energy range, with approximate equipartition between rotational and vibrational modes, particularly at the higher imp...

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Physics of Fluids : Flow and transport in brush-coated capillaries...

By: D. I. Dimitrov, L. I. Klushin, A. Milchev, and K. Binder

Description: We apply an efficient method of forced imbibition to (nano-)capillaries, coated internally with a polymer brush, to derive the change in permeability and suction force, corresponding to different grafting densities and lengths of the polymer chains. While the fluid is modeled by simple point particles interacting with Lennard-Jones forces, the (end-grafted, fully flexible) polymers, which form the brush coating, are described by a standard bead-spring model....

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Journal of Mathematical Physics : On the classification of Darboux...

By: Ismagil Habibullin, Natalya Zheltukhina, and Aslý Pekcan

Description: We study a differential-difference equation of the form tx(n+1) = f(t(n),t(n+1),tx(n)) with unknown t = t(n,x) depending on x and n. The equation is called a Darboux integrable if there exist functions F (called an x-integral) and I (called an n-integral), both of a finite number of variables x,t(n),t(n±1),t(n±2),…,tx(n),txx(n),…, such that DxF = 0 and DI = I, where Dx is the operator of total differentiation with respect to x and D is the shift operator: Dp...

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Journal of Applied Physics : The effect of SiO2 addition and measu...

By: M. A. Zubair and C. Leach

Description: The effects of SiO2 addition, in the range 0–3 at. %, on the high field electrical characteristics of positive temperature coefficient of resistance (PTC) thermistors have been characterized at several temperatures above the ferroelectric transition temperature TC. It was found that decreases in SiO2 content and increases in measurement temperature both decreased the field dependency of the current-voltage response. The electrical data were analyzed in terms...

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Biblioteca Hispanica : the Universe in Your Pocket Useful Knowledg...

By: Biblioteca Hispanica

Description: Astronomy, Natural science.

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Applied Physics Letters : Electric detection of ferromagnetic reso...

By: Xiong Hui, A. Wirthmann, Y. S. Gui, Y. Tian, X. F. Jin et al

Description: We report electric detection of ferromagnetic resonance (FMR) in epitaxially grown single crystal iron film through microwave photovoltage generation technique. The experimental results agree well with the established theory about FMR in iron films, showing excellent extendability of such a technique onto different ferromagnets as an effective way to study magnetocrystalline anisotropy and spin excitations. Furthermore, the information about the phase of mag...

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Physics of Fluids : High-order large-eddy simulation of flow over ...

By: M. Minguez, R. Pasquetti, and E. Serre

Description: The structure of the turbulent flow over a simplified automotive model, the Ahmed body ( S. R. Ahmed and G. Ramm, SAE Paper No. 8403001, 1984 ) with a 25° slanted back face, is investigated using high-order large-eddy simulations (LESs) at Reynolds number Re = 768 000. The numerical approach is carried out with a multidomain spectral Chebyshev–Fourier solver and the bluff body is modeled with a pseudopenalization method. The LES capability is implemented tha...

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Biblioteca Hispanica : Course of Natural History, Physiology and H...

By: Ramon Vigil Martinez
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Journal of Applied Physics : Testing the effect of surface coating...

By: S. J. Seltzer, D. M. Rampulla, S. Rivillon-Amy, Y. J. Chabal, S. L. Bernasek et al

Description: The evaluation of different surface coatings used in alkali metal atomic magnetometers is necessary for the improvement of sensitivity of these devices. A method to measure the polarization lifetime of alkali atoms in the region between substrates with different coatings was developed to determine the effectiveness of the coating at preserving alkali spin polarization as well as chemical compatibility and high-temperature stability. Multiple coatings can be ...

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Review of Scientific Instruments : A frequency-stabilized differen...

By: Wen-Ping Deng, Bo Gao, Cun-Feng Cheng, Guo-Sheng Cheng, Shui-Ming Hu et al

Description: A midinfrared laser spectrometer is built up based on the difference frequency generation (DFG) of a Nd:YAG (yttrium aluminum garnet) laser and a tunable Ti:sapphire (Ti:Sa) laser. Tuning the Ti:Sa laser and operating properly with the periodically poled lithium niobate crystal, the DFG emission is tunable in the spectral range of 2.3–5.0 μm. The 1064 nm Nd:YAG laser frequency is stabilized to the 10−6 cm−1 level on a Doppler-broadened I2 absorption line at ...

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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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Journal of Applied Physics : Propagation loss of terahertz surface...

By: Bowen Wang, Liu Liu, and Sailing He

Description: We analyze the propagation of terahertz surface plasmon polaritons on a periodically structured Ag surface by using a full-vectorial finite-difference time-domain method. The impact of some structural parameters on the dispersion relation and the propagation loss is analyzed. As the groove width increases, the dispersion curves asymptotically reach lower frequency values at the Brillouin zone edge, while the relation between the propagation loss and the groo...

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Review of Scientific Instruments : Resistivity and thermopower mea...

By: Ajay Soni and G. S. Okram

Description: Automated precision measurement setups for electrical resistivity of eight metallic samples simultaneously and thermoelectric power of different types of samples in the temperature range of 5–325 K have been developed. The details of the setups and their capabilities have been described. Usually each run takes nearly 5 h and typical error is within 3% and 4%, respectively. The results of high purity Nb and Pt samples are used as examples to demonstrate this.

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Biblioteca Hispanica : Elements of Natural History for Use by Seco...

By: Serafin Homes and Abad
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Review of Scientific Instruments : Transferring cold atoms in doub...

By: Junmin Wang, Jing Wang, Shubin Yan, Tao Geng, and Tiancai Zhang

Description: A novel scheme of transferring cold atoms in a double magneto-optical trap (MOT) system has been experimentally demonstrated. Cold cesium atoms trapped in a vapor-cell MOT are efficiently transferred to an ultrahigh-vacuum (UHV) MOT by a continuous-wave divergent Gaussian transfer laser beam. When large red detuning and moderate intensity are adopted for the transfer laser beam, enhancement of the recapturing of atoms in the UHV MOT is clearly observed. Usin...

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Civil War and Civil War Related Prints : Col B Grierson, 6Th Ill C...

By: Ariño Thomas Sancho
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