DVD已死？

当Blu-ray和HD-DVD出现在我们面前时．很多人都认为DVD的时代将很快终结．不过．Arcam公司却以独特的视角向这种想法提出挑战。Arcam公司是一家专注于研发Hi-Fi系统和家庭影院系统的专业公司．它拥有强大的研发能力和对新兴但尚未成熟产品近乎“偏执”的怀疑习惯。这次．它将矛头对准了被人们寄予厚望的下一代高清存储标准——Blu-Ray和HD-DVD。     

多尺度空间特征提取的脊柱图像拼接算法

针对脊柱图像视野有限,提出一种基于优化MSFE的脊柱图像自动拼接算法。设计出一种基于尺度因子变化的高斯卷积模板尺寸自适应调整以及双向配对办法;相似性度量采用城市距离;利用RANSAC算法去除错配,从而确定待拼接图像之间的变换参数,最后利用加权平均对图像融合。对实际取得的多幅脊柱图像拼接结果表明该算法具有很好的实时性和鲁棒性。     

汽车后视镜盲区及预测方法

介绍了几种常用的确定眼点位置的方法,讨论了目前比较流行的SAE眼椭圆方法,在此基础上推导出后视镜视角的计算公式,阐述了后视镜盲区的产生原因,重点探讨了目前几种比较典型的盲区预警系统.     

栽丝和填块在较大厚度灰口铸铁焊接修复中的应用

着重介绍在较大厚度灰口铸铁的实际焊接修复中，利用栽丝和填块两种工艺相结合而获得成功的经验。在生产中经常会遇到较大厚度的铸件因长期运行或安装、运输不当造成断裂，甚至在断裂处出现较大残缺，从而使设备无法正常使用，实践证明：采用合理的补焊工艺是可行的。     

施工阶段监理工作评价(三)

建立了给排水与采暖工程和建筑电气工程竣工验收阶段的评价要素,利用模糊评价方法对监理单位某一建设项目施工阶段给排水与采暖工程、建筑电气工程,竣工验收阶段的监理工作进行客观的综合评价,根据所有一级评价结果,进行"监理单位工作质量监控评价系统"的二级综合评价,根据评价结果可对监理单位的工作进行有效监督.     

The Experiment of Modulated Toroidal Current on HT-7 and HT-6M Tokamak

The Experiments of Modulated Toroidal Current were done on the HT-6M tokamak and HT-7 superconducting tokamak. The toroidal current was modulated by programming the Ohmic heating field. Modulation of the plasma current has been used successfully to suppress MHD activity in discharges near the density limit where large MHD m = 2 tearing modes were suppressed by sufficiently large plasma current oscillations. The improved Ohmic confinement phase was observed during modulating toroidal current (MTC) on the Hefei Tokamak-6M (HT-6M) and Hefei superconducting Tokamak-7 (HT-7). A toroidal frequency-modulated current, induced by a modulated loop voltage, was added on the plasma equilibrium current. The ratio of A.C. amplitude of plasma current to the main plasma current △Ip/Ip is about 12% ～ 30%. The different formats of the frequency-modulated toroidal current were compared.     

Thermal analysis of EAST neutral beam injectors for long-pulse beam operation

Two sets of neutral beam injectors(NBI-1 and NBI-2) have been mounted on the EAST tokamak since 2014. NBI-1 and NBI-2 are co-direction and counter-direction, respectively. As with indepth physics and engineering study of EAST, the ability of long pulse beam injection should be required in the NBI system. For NBIs, the most important and difficult thing that should be overcome is heat removal capacity of heat loaded components for long-pulse beam extraction. In this article, the thermal state of the components of EAST NBI is investigated using water flow calorimetry and thermocouple temperatures. Results show that(1) operation parameters have an obvious influence on the heat deposited on the inner components of the beamline,(2) a suitable operation parameter can decrease the heat loading effectively and obtain longer beam pulse length, and(3) under the cooling water pressure of 0.25 MPa, the predicted maximum beam pulse length will be up to 260 s with 50 keV beam energy by a duty factor of 0.5. The results present that, in this regard, the EAST NBI-1 system has the ability of long-pulse beam injection.     

实时控制系统软件的可靠性

为了保证实时控制系统的有效运行,除了满足其实时性要求外,可靠性也很重要。该文讨论了实时控制系统的软件可靠性问题,介绍了QNX的高可用性工具,并根据低杂波系统的分布式实时控制需求提出了通用可靠性模型。该模型为低杂波各子系统的开发提供了统一规范,有效保证了系统的可靠性。     

基于有限元法进行铁道车辆橡胶元件的设计

介绍了描述橡胶类超弹性材料的几个应变能函数,并从橡胶材料实验数据的曲线拟合得到Yeoh模型的材料常数,进而采用有限元法对铁道车辆用橡胶元件粘合圆柱块及圆锥形橡胶弹簧进行了设计分析。     

沥青路面层状粘弹性半空间轴对称问题的求解

沥青路面中的沥青材料是一种典型的粘弹性材料,利用积分变换和传递矩阵的方法推导了沥青路面多层粘弹性半空间轴对称问题的解析解,引入F.Durbin的方法实现Laplace逆变换,通过实例计算路表弯沉表明初始时段所得结果与弹性解基本一致,随着时间的推移,沥青路面多层粘弹体系路表弯沉增大,说明随时间的推移,沥青材料的粘性起到更大的作用,反映了粘弹材料的蠕变变化规律,这与沥青路面实际情况相符.此方法可以很容易推广到沥青路面多层粘弹体系动力学问题之中.