LC decoupling circuit for arbitrarily placed coils

published_or_final_versio

Compensation for mutual coupling in transmit SENSE

Transmit SENSE has been developed to decrease the RF excitation duration by using a transmit coil array. In this work, mutual coupling between coils is taken into account by introducing a coupling coefficient matrix into the central equation of transmit SENSE. Simulations demonstrate that this method is effective to compensate for aliasing artifacts in transmit SENSE.published_or_final_versio

Optimal Principal Component Analysis in Distributed and Streaming Models

We study the Principal Component Analysis (PCA) problem in the distributed and streaming models of computation. Given a matrix $A \in R^{m \times n},$ a rank parameter $k < rank(A)$, and an accuracy parameter $0 < \epsilon < 1$, we want to output an $m \times k$ orthonormal matrix $U$ for which $$|| A - U U^T A ||_F^2 \le \left(1 + \epsilon \right) \cdot || A - A_k||_F^2,$$ where $A_k \in R^{m \times n}$ is the best rank-$k$ approximation to $A$. This paper provides improved algorithms for distributed PCA and streaming PCA.Comment: STOC2016 full versio

Bosonic Super Liouville System: Lax Pair and Solution

We study the bosonic super Liouville system which is a statistical transmutation of super Liouville system. Lax pair for the bosonic super Liouville system is constructed using prolongation method, ensuring the Lax integrability, and the solution to the equations of motion is also considered via Leznov-Saveliev analysis.Comment: LaTeX, no figures, 11 page

Efficient unknown tag identification protocols in large-scale RFID systems

PublishedJournal ArticleOwing to its attractive features such as fast identification and relatively long interrogating range over the classical barcode systems, radio-frequency identification (RFID) technology possesses a promising prospect in many practical applications such as inventory control and supply chain management. However, unknown tags appear in RFID systems when the tagged objects are misplaced or unregistered tagged objects are moved in, which often causes huge economic losses. This paper addresses an important and challenging problem of unknown tag identification in large-scale RFID systems. The existing protocols leverage the Aloha-like schemes to distinguish the unknown tags from known tags at the slot level, which are of low time-efficiency, and thus can hardly satisfy the delay-sensitive applications. To fill in this gap, two filtering-based protocols (at the bit level) are proposed in this paper to address the problem of unknown tag identification efficiently. Theoretical analysis of the protocol parameters is performed to minimize the execution time of the proposed protocols. Extensive simulation experiments are conducted to evaluate the performance of the protocols. The results demonstrate that the proposed protocols significantly outperform the currently most promising protocols.This work was supported by NSFC (Grant Nos. 60973117, 61173160, 61173162, and 60903154), New Century Excellent Talents in University (NCET) of Ministry of Education of China, The Research Fund for the Doctoral Program of Higher Education (Program No. 20130041110019) and the National Science Foundation for Distinguished Young Scholars of China (Grant No. 61225010)

Observation of optically addressable nonvolatile memory in VO₂ at room temperature

Vanadium dioxide (VO2) is a phase change material that can reversibly change between high and low resistivity states through electronic and structural phase transitions. Thus far, VO2 memory devices have essentially been volatile at room temperature, and nonvolatile memory has required non-ambient surroundings (e.g., elevated temperatures, electrolytes) and long write times. For the first time, here, the authors report the observation of optically addressable nonvolatile memory in VO2 at room temperature with a readout by voltage oscillations. The read and write times have to be kept shorter than about 150 µs. The writing of the memory and onset of the voltage oscillations have a minimum optical power threshold. Although the physical mechanisms underlying this memory effect require further investigations, this discovery illustrates the potential of VO2 for new computing devices and architectures, such as artificial neurons and oscillatory neural networks

Proteomic analysis of human oral verrucous carcinoma

This study is about proteomic analysis of oral verrucous carcinoma (OVC). The total proteins obtained from tumour and adjacent normal oral mucosa of patients with OVC and oral squamous cell carcinoma (OSCC) were separated with two dimensional electrophoresis (2-DE) by using immobilized pH gradient strips and visualized by staining with silver nitrate. The gel images were acquired by scanner and 2-DE analysed by image master 2D elite. Twenty distinct protein spots were excised from gel randomly and digested in gel by TPCK-trypsin. Mass analysis of the tryptic digested peptides mixture was performed by using MALDI-TOF-MS. Peptide mass fingerprints (PMFs) obtained by the MALDI-TOF analysis were applied to National Center for Biotechnology Information (NCBI), SWISS-PROT and MSDB databases using Mascot software. Then the 2-DE gel imaging showed that 74, 36 and 31 differential protein spots were found between OVC and OSCC, OVC and adjacent normal oral mucosa of OVC (OVCN), OSCC and adjacent normal oral mucosa of OSCC (OSCCN) samples, respectively. By identification of protein spots from 2-DE gels, 20 PMF maps were obtained by MALDI-TOF-MS including recoverin (cancer  associated retinopathy (CAR) protein) tumor protein D53 (hD53), zinc finger protein 77 (ZNFpT1) and so on and these protein may play a key role in the carcinogenesis of OVC and OSCC.Key words: Oral verrucous carcinoma, oral squamous cell carcinoma, two-dimensional electrophoresis, peptide mass fingerprints, matrix-assisted laser desorption/ionization-time of flight mass spectrometry

Insulating behavior in ultra-thin bismuth selenide field effect transistors

Ultrathin (~3 quintuple layer) field-effect transistors (FETs) of topological insulator Bi2Se3 are prepared by mechanical exfoliation on 300nm SiO2/Si susbtrates. Temperature- and gate-voltage dependent conductance measurements show that ultrathin Bi2Se3 FETs are n-type, and have a clear OFF state at negative gate voltage, with activated temperature-dependent conductance and energy barriers up to 250 meV