Multiplexed Frequency Spectrum Analyzer Instrumentation for the Characterization of Multiple QCM-Based Biosensors

In this contribution, we present novel multiplexed frequency spectrum analyzer instrumentation to extract operational parameters and completely characterize the frequency response of an array of quartz_crystal microbalance sensors. The effectiveness of the proposed instrumentation is proven by experimental measurements over a range of frequencies. © 2007 IEEE

Unconventional Superconductivity in Heavy Fermion Systems

We review the studies on the emergent phases of superconductvity and magnetism in the $f$-electron derived heavy-fermion (HF) systems by means of the nuclear-quadrupole-resonance (NQR) under pressure. These studies have unraveled a rich variety of the phenomena in the ground state of HF systems. In this article, we highlight the novel phase diagrams of magnetism and unconventional superconductivity (SC) in CeCu$_2$Si$_2$, HF antiferromagnets CeRhIn$_5$, and CeIn$_3$. A new light is shed on the difference and common features on the interplay between magnetism and SC on the magnetic criticality.Comment: 15 pages, 13 figures, to appear in J. Phys. Soc. JPN, 74, No.1 (2005), special issue "Kondo Effect- 40 Years after the Discovery

Multiband Superconductivity in Heavy Fermion Compound CePt3Si without Inversion Symmetry: An NMR Study on a High-Quality Single Crystal

We report on novel superconducting characteristics of the heavy fermion (HF) superconductor CePt3Si without inversion symmetry through 195Pt-NMR study on a single crystal with T_c= 0.46 K that is lower than T_c= 0.75 K for polycrystals. We show that the intrinsic superconducting characteristics inherent to CePt3Si can be understood in terms of the unconventional strong-coupling state with a line-node gap below T_c= 0.46 K. The mystery about the sample dependence of T_c is explained by the fact that more or less polycrystals and single crystals inevitably contain some disordered domains, which exhibit a conventional BCS s-wave superconductivity (SC) below 0.8 K. In contrast, the Neel temperature T_N= 2.2 K is present regardless of the quality of samples, revealing that the Fermi surface responsible for SC differ from that for the antiferromagnetic order. These unusual characteristics of CePt3Si can be also described by a multiband model; in the homogeneous domains, the coherent HF bands are responsible for the unconventional SC, whereas in the disordered domains the conduction bands existing commonly in LaPt3Si may be responsible for the conventional s-wave SC. We remark that some impurity scatterings in the disordered domains break up the 4f-electrons-derived coherent bands but not others. In this context, the small peak in 1/T_1 just below T_c reported in the previous paper (Yogi et al, 2004) is not due to a two-component order parameter composed of spin-singlet and spin-triplet Cooper pairing states, but due to the contamination of the disorder domains which are in the s-wave SC state.Comment: 10 pages, 9 figures, Accepted for publication in J. Phys. Soc. Jpn., vol.78, No.1 (2009

Principes de la thermographie microonde par corrélation

Correlation Microwave Thermography (CMWT) is a particular case of Microwave Thermography (MWT) or radiometry applied to the measurement of thermal noise. It concerns at present biomedical engineering (diagnostic methods based on the investigation into thermal gradients which occur in living tissues). This paper presents the basis of this method and analyses some of its characteristics. The experimental part of this study is carried out using a system built in our laboratory, working in the S band (2-4 GHz).La Thermographie Microonde par Corrélation (T.M.O.C.) est un cas particulier de la Thermographie Microonde (T.M.O.) — ou radiométrie appliquée à la mesure du bruit thermique — qui intéresse actuellement les applications médicales (méthodes diagnostiques et d'investigations fondées sur la mise en évidence des gradients thermiques existant dans les tissus vivants). A la différence des méthodes classiques de T.M.O., la T.M.O.C. met en oeuvre une détection cohérente du bruit. Nous présentons les principes de cette méthode et analysons certaines de ses caractéristiques. La partie expérimentale de cette étude est effectuée à l'aide d'un système construit au laboratoire fonctionnant en bande S (2-4 GHz)

Novel Antenna Structure for Early Breast Cancer Detection

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