金属材料性能试验数据的统计处理

详细阐述了试验数据的表示方法以及数据统计的方法，分析了测量数据的不确定性产生的原因及其确定和测量误差产生的原因及其传递。     

Bandwidth correction for LED chromaticity

The spectral bandwidth formulae of Stearns and Stearns   are generalized for an arbitrary slit function. Correction coefficients are derived in terms of moments of the slit function. Application to model LED spectra measured with a compact, fiber‐coupled spectrometer having bandwidth of order 12 nm, and a nonlinear wavelength scale shows that accurate LED color measurements may be obtained with such an instrument. Fitting of the relatively broad slit function to line spectra for accurate wavelength calibration is also described. Such fitting, coupled consistently with the bandpass correction, improves the accuracy color measurements with a broad‐response spectrometer. © 2006 Wiley Periodicals, Inc. Col Res Appl, 31, 374–380, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20242     

A general variance predictor for Cavalieri slices

A general variance predictor is presented for a Cavalieri design with slices of an arbitrary thickness t ≥ 0. So far, prediction formulae have been available either for measurement functions with smoothness constant q = 0, 1, … , and t ≥ 0, or for fractional q ∈ [0, 1] with t = 0. Because the possibility of using a fractional q adds flexibility to the variance prediction, we have extended the latter for any q ∈ [0, 1] and t ≥ 0. Empirical checks with previously published human brain data suggest an improved performance of the new prediction formula with respect to the hitherto available ones.     

水工监测传感器指标使用误区的探讨

本文旨在讨论目前岩土工程中使用的传感器技术指标及其含义，希望通过探讨以弄清楚这些指标的含义及指标对评价传感器的意义。由于传感器是用于测量工程物理量的，因此，引人目前在国际上通用的测量与误差的概念，以国家现有的测量术语的定义为准来描述传感器的指标。     

电脑—探针微孔测量方法研究

本文讨论了微孔自动化测量装置的原理与结构。电接触探针在微机控制下,在X方向找中心,在Y方向进行孔径测量。该系统不仅能实现测量过程自动化和测量结果自动显示,而且能自动消除测量工作台丝杠螺母反向间隙对测量精度的影响。     

多量程数据采集记录装置的设计

通常的数据采集与记录装置不易实现多量程测量。通过对标度方程进行分析得知,要改变量程只须改变两个参数——标度因子和量程下限。我们设计了一个使用单片机的多量程数据采集和记录装置,能处理多达256种量程。本文叙述了算法分析、硬件和软件的设计以及该装置的性能指标。     

Some experimental findings in compression-after-impact (CAI) tests of CF/PEEK (APC-2) and conventional CF/epoxy flat plates

Compression-after-impact (CAI) tests have been conducted for quasi-isotropic thick plates with 48 plies by using the NASA method and on plates with 32 plies by using the SACMA method. Specimens are made of CF/PEEK (APC-2) and conventional CF/epoxy for the NASA plates and CF/epoxy for the SACMA plates. In the NASA CAI tests, the sequence of delamination buckling and its propagation is clearly revealed through various experimental techniques. One major technique is moiré topography, and the other is thermo-mechanical stress analysis with a high-accuracy infrared sensor. The arrest of delamination propagation just before catastrophic failure due to high fracture toughness is clearly captured by the moiré camera. This behavior provides good CAI values of CF/PEEK. The initial buckling properties of the delaminated region by the impact are then extensively discussed. Numerical predictions of initial buckling stress have been obtained by modelled geometry of the delaminated region simplified from its precise structure clarified by ultrasonic C-scanning. They agree fairly well with the experimental results. The in-plane stress distribution in the delaminated region before initial buckling is measured by an infrared stress graphic system. This compared favorably with finite element predictions. Two types of symmetric buckling modes with respect to the central plate surface, twin and single peak ones, are experimentally captured.     

直齿圆柱变位齿轮的一种测绘方法

在工程实践中对损坏的无图纸齿轮进行重新制造时，测绘是必不可少的环节。在齿面已被严重磨损的情况下，如何准确地得到齿轮尤其是变位齿轮的各项参数是本文所着重讨论的问题。     

ULSI中的铜互连线RC延迟

随着ULSI向深亚微米特征尺寸发展，互连引线成为ULSI向更高性能发展的主要限制因素。由互连引线引起的串扰噪音及RC延迟限制了ULSI的频率性能的提高，同时考虑到电迁移和功率损耗，人们开始寻找新的互连材料；低电阻率的铜互连材料和低介电常数介质的结合可以有效地发送互连线的性能，主要讨论了互连延迟的重要性以及发送和计算延迟的方法。     

震源延迟叠加技术及应用效果

延迟叠加爆炸是针对高分辨率和深层地震勘探而提出来的一种激发方式。这种激发方式能在保证地震分辨率的前提下有效提高地震波能量 ,在地震波的入射角范围内 ,有效克服非球形炸药激发引起的地震波传播的方向性。应用弹性波动力学对多级延迟爆炸进行理论研究 ,结合实际试验资料 ,研究了延迟爆炸情况下激发参数对地震波能量、主频、频宽等的影响。从几何地震学出发 ,分析了不同时间激发的地震波在地下空间中的干涉情况 ,对其能量传播的方向性进行了研究。理论分析和试验效果表明 ,延迟叠加震源与相同药量的普通震源相比 ,激发地震波的主频高 ,频带宽 ,增强了下传能量 ,降低了次生干扰 ,在高分辨率和深层地震勘探中具有明显的优势。