基于影响力形成的论坛意见领袖识别

为了在网络论坛中提取意见领袖,文中通过抽象模拟论坛舆论意见领袖影响力的形成过程,建立了影响力向量模型,进而提出了可以利用影响力向量的模和方向这对参数来筛选意见领袖,并以天涯论坛某日的一个话题为研究个案,阐述了该参数的选择依据。再通过聚类分析比较不同类型的论坛舆论参与者的特点,将分析结果与提出模型筛选的结果相比对,论证文中方法结果的有效性和准确性,反应出文中提出参数的优越性。     

Tissue-Engineered Vascular Grafts: Emerging Trends and Technologies

Vascular tissue engineering has made prodigious progress in recent years by converging multidisciplinary approaches. Latest technological advancements foster the development of next-generation tissue-engineered vascular grafts (TEVGs) for treating various vasculopathies. While traditional therapeutic methods rely on bypassing the severely damaged vessels with synthetic counterparts with no growth potential, contemporary perspectives focus on biodegradable conduits bestowing an inherent remodeling capability. This review highlights emerging innovative trends and technologies adopted to pragmatically fulfill current scientific needs while improving overall TEVG performance in pre-clinical and clinical settings. A comprehensive overview of various milestones achieved in the past few decades is first summarized, followed by an appraisal of the significant hurdles for clinical translation. The latest techniques to rationally address critical challenges, viz., intimal hyperplasia, thrombosis, constructive graft remodeling, and adequate neo-tissue formation are discussed. Finally, an update on ongoing clinical trials is provided and future perspectives required to persuade TEVGs to become a clinical reality are delineated.     

使用铜纳米和银纳米的电路形成技术

概述了使用纳米粒子的电路形成技术。     

基于遗传算法的分布式星载SAR-GMTI编队优化

以改善因子损失衡量的测速比和时间效用比为联合指标,评价了CartWheel、Pendulum、SAR-Train等典型编队的性能.采用遗传算法优化编队,以卫星的6个轨道根数为优化变量,仿真证明了性能评价指标和优化算法的正确性.然后根据轨道摄动理论和GMTI(Ground Moving Target Indication)对垂直基线的限制来制定约束条件,优化得到了同时符合紧密编队控制要求和GMTI性能需求的编队构形.     

Formation of stacked ruthenium nanocrystals embedded in SiO2 for nonvolatile memory applications

n metal oxide semiconductor (MOS)capacitors fabricated by the former method, which are much better than 4.6 Ⅴ and no window remaining after one year observed in the latter. The former method is compatible with conventional CMOS technology.     

Fabrication of Superjunction Trench Gate Power MOSFETs Using BSG‐Doped Deep Trench of p‐Pillar

In this paper, we propose a superjunction trench gate MOSFET (SJ TGMOSFET) fabricated through a simple p pillar forming process using deep trench and boron silicate glass doping process technology to reduce the process complexity. Throughout the various boron doping experiments, as well as the process simulations, we optimize the process conditions related with the p pillar depth, lateral boron doping concentration, and diffusion temperature. Compared with a conventional TGMOSFET, the potential of the SJ TGMOSFET is more uniformly distributed and widely spread in the bulk region of the n drift layer due to the trenched p‐pillar. The measured breakdown voltage of the SJ TGMOSFET is at least 28% more than that of a conventional device.     

基于舰艇编队的反舰导弹航路规划

根据舰艇编队对海导弹攻击中航路规划指挥决策的需要,为避免出现各舰发射的导弹出现航路交叉现象,提出单舰导弹航路规划功能区域的概念和编队导弹航路规划区域划分的思想,建立了编队导弹航路规划区域划分模型.分析了编队导弹航路规划的决策过程,并且结合想定装备参数运用遗传算法进行了编程实现和算例分析.为指挥员实施导弹航路规划决策提供辅助决策和科学依据.     

激光焊接工艺参数对NiTi形状记忆合金焊缝成形的影响

采用Nd∶YAG连续激光器对2mm厚NiTi形状记忆合金(SMA)进行激光焊接。研究了激光焊接过程中激光功率、焊接速度、离焦量、侧吹保护气流量等主要工艺参数对焊缝成形的影响。结果表明,激光功率、焊接速度、离焦量等工艺参数的合理匹配是实现NiTi合金良好焊缝成形的关键因素。线能量为59～75.6J/mm时能获得最佳焊缝成形;离焦量在-2～3mm时均能使厚度2mmNiTi合金试件焊透,其中离焦量在0～1mm可以得到最佳焊缝成形;当侧吹气流量为15～20L/min时,气体保护效果和焊缝成形最好。通过大量工艺实验得到2mm厚NiTi合金焊接速度与激光功率的不同匹配对焊缝成形影响的曲线,为NiTi合金焊接加工及工程应用提供参考。     

The direct determination of the vacancy concentration andP-T phase diagram of Hg0.8Cd0.2Te and Hg0.6Cd0.4Te by dynamic mass-loss measurements

A modified mass-loss measurement technique is employed, for the direct,in- situ determination of the metal vacancy formation in (Hg_1x2212;itxCd _x )_1−y Te _y (s) withx = 0.2 and 0.4. Forx = 0.2, the metal vacancy concentrations are determined between 336 and 660° C for three different compositions(y) within the homogeneity region and range from 2.4 to6.8 x 10¹⁹cm₋₃. The enthalpy of formation of a singly-ionized metal vacancy is derived to be between 0.17 and 0.45 eV depending upon the deviation from stoichiometry (compositiony). Forx= 0.4, three samples of different y-values give the metal vacancy concentrations from 1.9 to 5.5 x 10¹⁹cm⁻³ between 316 and 649° C, and the enthalpy of vacancy formation between 0.25 and 0.40 eV. Compared to the recent data on HgTe(s), these experimental results show a slight but significant decrease in the enthalpy of vacancy formation from HgTe to Hg_0.8Cd_0.2Te, which supports theoretical predictions of the bond weakening effect of Cd for the latter alloy system. Based on the simultaneously determined equilibrium Hg partial pressures within the homogeneity range, the vacancy concentration-partial pressure isotherms are constructed. The Hg partial pressures are also measured along the three-phase boundaries of the solid solutions of bothx = 0.2 and 0.4, and these are in close agreement with published data obtained by optical absorption measurements.     

An efficient algorithm for backbone construction in cognitive radio networks

Numerous research articles exist for backbone formation in wireless networks; however, they cannot be applied straightforward in cognitive radio network (CRN) due to its peculiar characteristics. Since virtual backbone has many advantages such as reduced routing overhead, dynamic maintenance, and fast convergence speed, we intend to propose a backbone formation protocol in CRN. In this paper, we propose a tree‐based backbone formation protocol along with its maintenance. Our protocol is based on non‐iterative approach, thus leading towards limited message overhead and faster convergence speed. The proposed algorithm first forms the tree by maintaining the parent‐child relationship, and second, the parent nodes are connected together to form the virtual backbone. In the end, we evaluate the performance our protocol through extensive simulations.