Design and Implementation of a FPGA and DSP Based MIMO Radar Imaging System

The work presented in this paper is aimed at the implementation of a real-time multiple-input multiple-output (MIMO) imaging radar used for area surveillance. In this radar, the equivalent virtual array method and time-division technique are applied to make 16 virtual elements synthesized from the MIMO antenna array. The chirp signal generater is based on a combination of direct digital synthesizer (DDS) and phase locked loop (PLL). A signal conditioning circuit is used to deal with the coupling effect within the array. The signal processing platform is based on an efficient field programmable gates array (FPGA) and digital signal processor (DSP) pipeline where a robust beamforming imaging algorithm is running on. The radar system was evaluated through a real field experiment. Imaging capability and real-time performance shown in the results demonstrate the practical feasibility of the implementation

The newly observed Λb(6072)0\Lambda_b(6072)^0 structure and its ρ−\rho-mode nonstrange partners

Inspired by the newly observed $\Lambda_b(6072)$ structure, we investigate its strong decay behaviors under various assignments within the $^3P_0$ model. Compared with the mass and total decay width, our results suggest that the $\Lambda_b(6072)$ can be regarded as the lowest $\rho-$mode excitation in $\Lambda_b$ family. Then, the strong decays of $\rho-$mode nonstrange partners for the $\Lambda_b(6072)$ are calculated. It is found that the $J^P=5/2^-$ $\Lambda_b$ and $\Lambda_c$ states are relatively narrow, and mainly decay into the $\Sigma_b^{(*)} \pi$ and $\Sigma_c^{(*)} \pi$ final states, respectively. These two states have good potentials to be observed in future experiments, which may help us to distinguish the three-quark model and diquark model.Comment: 8 pages, 4 figures, comments and suggestions are welcom

Tensor network implementation of bulk entanglement spectrum

Many topologically nontrivial states of matter possess gapless degrees of freedom on the boundary, and when these boundary states delocalize into the bulk, a phase transition occurs, and the system becomes topologically trivial. We show that tensor networks provide a natural framework for analyzing such topological phase transitions in terms of the boundary degrees of freedom which mediate it. To do so, we make use of a correspondence between a topologically nontrivial ground state and its phase transition to a trivial phase established in T. Hsieh and L. Fu (arXiv:1305.1949). This involved computing the bulk entanglement spectrum (BES) of the ground state upon tracing out an extensive subsystem. This work implements BES via tensor network representations of ground states. In this framework, the universality class of the quantum critical entanglement Hamiltonian in d spatial dimensions is either derived analytically or mapped to a classical statistical model in d + 1 dimensions, which can be studied using Monte Carlo or tensor renormalization-group methods. As an example, we analytically derive the universality classes of topological phase transitions from the spin-1 chain Haldane phase and demonstrate that the Affleck-Kennedy-Lieb-Tasaki (AKLT) wave function (and its generalizations) remarkably contains critical six-vertex (and, in general, eight-vertex) models within it.National Science Foundation (U.S.). Graduate Research Fellowship (0645960)United States. Dept. of Energy. Division of Materials Sciences and Engineering (Award DE-SC0010526

State Ownership and Banks Information Rents: Evidence from China

In a lending relationship, a bank with an information advantage regarding its client tends to hold up the borrower and charge higher interest rates. We conjecture that state-owned enterprises (SOEs), with worse information asymmetry, are subject to greater informationrents. State-owned banks place less emphasis on information production and hence extract lower rents compared to profit maximizing private banks. We use the decline of loan interest rates around the borrowers’ equity initial public offerings (IPOs) as the proxy of banks’ information rents. We find SOEs in China experiencelarger declines in loan interest rates around their IPOs; the central government-controlled Big Four banks exhibit smaller declines in rates they charge, and their rate declines concentrate on loans made to SOEs

Xenotransplantation for Islets from Clinical Side

Islet transplantation can eliminate severe hypoglycemia symptoms caused by conventional treatment, and has the advantages of less trauma and complications, which is considered as the most promising treatment for type 1 diabetes mellitus (T1DM). Regulatory guidance is needed for a standard pig source. In section 1, the regulation of medical grade designed pathogen free (DPF) donor pig for clinical xenotransplantation consists of five parts: genetic quality control, microbiological surveillance, formula feeds, specification of pathological diagnosis, and requirements of environment and housing facilities. In section 2, we present the current approach and progress in pig donor selecting, pancreatic digestion, isolation and preparation of porcine islet grafts, identification and quality assessment of final islet product in clinical trials. The liver is currently the most preferred site for islet transplantation, even though it is far from ideal. A large number of alternative sites have been used for islet transplantation in experimental animal models to provide improved engraftment and long-term survival. In Section 3, we introduce some commonly used sites in xenotransplantation. The benefits and drawbacks of each parameter above are discussed in an attempt to decide which is the most suitable for clinical use and to direct future research

Biosafety Barrier to Xenotransplantation

Biosafety barrier is most important for xenotransplantation clinical trial. Source animals used in xenotransplantation should be bred in a closed herd and raised in a well-controlled, pathogen-free environment with high standards of animal welfare. To ensure the source animals’ freedom from known pathogens under adequate biosecurity and surveillance, extensive tests must be done. Biosafety of DPF source pig should be proved by animal model before clinical trial. In addition, inclusion criteria for transplant recipients and clinical safe transplantation protocol should be established. Comprehensive anti-immune rejection treatment based on immune tolerance program can significantly prolong the xenograft survival and reduce the adverse impact on the immune system, which is suitable for clinical application. According to the clinical follow-up plan of the xenograft recipients, the patients should come back to the hospital for a check at regular intervals after the transplantation. The database of clinical trials for xenotransplantation should be established, including specimens, paper documents, and electronic documents. The information and samples of xenotransplantation donors and recipients should be preserved for long time