APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

25 Feb 2008

Volume 92, Issue 8, Articles (08xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 92, 081101 (2008); http://dx.doi.org/10.1063/1.2883874 (3 pages)

Marcel W. Pruessner, Todd H. Stievater, and William S. Rabinovich
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Plugging of porous media and filters: Maximum clogged porosity

Guido Kampel, Guillermo H. Goldsztein, and Juan C. Santamarina

Appl. Phys. Lett. 92, 084101 (2008); http://dx.doi.org/10.1063/1.2883947 (3 pages) | Cited 2 times

Online Publication Date: 25 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We model porous media as two-dimensional networks of channels. As suspension flows through the network, particles clog channels. Assuming no flow through clogged channels, we determine an upper bound on the number of channels that clog and leave the network impervious. More precisely, the number of channels that clog does not exceed the number of faces of the multigraph associated with the network. In terms of d, the average coordination number of the network, the number of channels that clog does not exceed (1−2/d) of the total number of channels.
Show PACS
47.56.+r Flows through porous media
47.60.Dx Flows in ducts and channels
47.57.E- Suspensions

Terahertz scanning imaging with a subwavelength plastic fiber

Ja-Yu Lu, Chui-Min Chiu, Chung-Chiu Kuo, Chih-Hsien Lai, Hung-Chung Chang, Yuh-Jing Hwang, Ci-Ling Pan, and Chi-Kuang Sun

Appl. Phys. Lett. 92, 084102 (2008); http://dx.doi.org/10.1063/1.2816122 (3 pages) | Cited 9 times

Online Publication Date: 26 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The feasibility to perform fiber-scanning terahertz imaging utilizing a terahertz subwavelength plastic fiber is investigated. Our study shows that, with a low (<1%) fractional power inside the fiber core, the bending loss of the terahertz subwavelength fiber is acceptable to enable large area scanning without seriously sacrificing the signal-to-noise ratio of the acquired image. With a transmission geometry, this feasibility is demonstrated by direct two-dimensional scanning of the terahertz subwavelength fiber output end to image different biological samples and concealed substances.
Show PACS
81.40.Lm Deformation, plasticity, and creep

Electronic states in arsenic-decapped MnAs (1math00) films grown on GaAs(001): A photoemission spectroscopy study

M. Moreno, A. Kumar, M. Tallarida, K. Horn, A. Ney, and K. H. Ploog

Appl. Phys. Lett. 92, 084103 (2008); http://dx.doi.org/10.1063/1.2888953 (3 pages) | Cited 1 time

Online Publication Date: 26 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We examine the arsenic bonding in the near-surface region of initially arsenic-capped MnAs(1math00) films grown on GaAs(001), as it evolves upon arsenic decapping. Line-shape analyses of high-resolution As 3d photoelectron emission spectra recorded at room temperature (RT) allow us to identify electronically distinct As-bonding states associated to bulk MnAs phases, bulk arsenic, and interfacial environments. Stable MnAs phases appear to be affected by the presence of a thin arsenic coating, an effect that could be advantageously used to enhance the ferromagnetic properties of MnAs films around RT.
Show PACS
75.50.Cc Other ferromagnetic metals and alloys
75.70.Ak Magnetic properties of monolayers and thin films
79.60.Bm Clean metal, semiconductor, and insulator surfaces

Application of ion scattering spectroscopy to measurement of surface potential of MgO thin film under ion irradiation

T. Nagatomi, T. Kuwayama, Y. Takai, K. Yoshino, Y. Morita, M. Kitagawa, and M. Nishitani

Appl. Phys. Lett. 92, 084104 (2008); http://dx.doi.org/10.1063/1.2888957 (3 pages) | Cited 6 times

Online Publication Date: 26 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
An experimental approach was proposed for the measurement of the surface potential (SP) induced on an insulator surface during ion irradiation by ion scattering spectroscopy (ISS). The resultant ISS spectra obtained for a MgO thin film of 600 nm thickness on a Si substrate under 950 eV He+ irradiation revealed that the surface is positively charged by approximately 230 V. In addition, the onset energy of a secondary ion peak indicated a SP of approximately 205 V. The present results confirmed that ISS is an effective technique for measuring the SP during ion irradiation.
Show PACS
68.49.Sf Ion scattering from surfaces (charge transfer, sputtering, SIMS)
61.80.Jh Ion radiation effects
79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces

Directional Brownian diffusion dynamics with variable magnitudes

Basanta Bhaduri, Adrian Neild, and Tuck Wah Ng

Appl. Phys. Lett. 92, 084105 (2008); http://dx.doi.org/10.1063/1.2887883 (3 pages) | Cited 12 times

Online Publication Date: 26 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The coupling effects of rotational and translational Brownian motion in anisotropic macromolecules result in differentiated diffusion constants parallel and perpendicular to the particle’s long axis in the short term. Investigations of these dynamics allow for a greater understanding of how directional alignment can be harnessed for applications. We investigate the dynamics using carbon nanofibers here and the results infer that significant reduction in the diffusion constants can result from probable hydrodynamic interactions. The diffusion constant perpendicular to the particle’s long axis is particularly reduced.
Show PACS
66.30.Pa Diffusion in nanoscale solids
61.46.-w Structure of nanoscale materials

In situ investigation on dynamic suspending of microdroplet on lotus leaf and gradient of wettable micro- and nanostructure from water condensation

Yongmei Zheng, Dong Han, Jin Zhai, and Lei Jiang

Appl. Phys. Lett. 92, 084106 (2008); http://dx.doi.org/10.1063/1.2887899 (3 pages) | Cited 25 times

Online Publication Date: 27 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Dynamic suspending behavior of microdroplet on fresh lotus leaf is in situ investigated at micro- and nanolevels, by water condensation via environmental scanning electronic microscopy. The observation and analysis reveal that a gradient of wettable micro- and nanostructure is formed along the exterior surface of papilla including nanohairs during water condensation. This gradient introduces a tendency of directional movement and enables the microdroplet move out of the valley of papillae until the microdroplet is suspended on the tops of papillae. This finding is significant to understand the mechanism of self-cleaning.
Show PACS
68.03.Fg Evaporation and condensation of liquids
68.08.Bc Wetting

Space partitioning via Hilbert transform for symbolic time series analysis

Aparna Subbu and Asok Ray

Appl. Phys. Lett. 92, 084107 (2008); http://dx.doi.org/10.1063/1.2883958 (3 pages) | Cited 16 times

Online Publication Date: 28 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Symbol sequence generation is a crucial step in symbolic time series analysis of dynamical systems, which requires phase-space partitioning. This letter presents analytic signal space partitioning (ASSP) that relies on Hilbert transform of the observed real-valued data sequence into the corresponding complex-valued analytic signal. ASSP yields comparable performance as other partitioning methods, such as symbolic false nearest neighbor partitioning (SFNNP) and wavelet-space partitioning (WSP). The execution time of ASSP is several orders of magnitude smaller than that of SFNNP. Compared to WSP, the ASSP algorithm is analytically more rigorous and is approximately five times faster.
Show PACS
02.30.Uu Integral transforms
02.30.Lt Sequences, series, and summability
05.45.Tp Time series analysis

Experimental characterization and cell interactions of a two-dimensional isotropic left-handed metamaterial

Jingjing Zhang, Hongsheng Chen, Lixin Ran, Yu Luo, Bae-Ian Wu, and Jin Au Kong

Appl. Phys. Lett. 92, 084108 (2008); http://dx.doi.org/10.1063/1.2884528 (3 pages) | Cited 6 times

Online Publication Date: 29 February 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We experimentally realized a two-dimensional (2D) isotropic left-handed material based on a cross-embedded S-ring resonator. Experimental results show that the 2D metamaterial with cross embedded arrangement exhibits much better performance than that with conventional arrangement. Theoretical interpretations are proposed, showing a reduced coupling between the rings that are located in the two orthogonal directions.
Show PACS
84.40.-x Radiowave and microwave (including millimeter wave) technology
84.40.Az Waveguides, transmission lines, striplines
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close