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Digitization of optical lever instruments
optical level digitalization DSP CCD linear sensor Wood-Anderson grotta gigante pendulums
2015/9/28
Some classical old-fashioned instruments (such as the Wood-Anderson seismometers), as well as some modern instruments (like the all-quartz made Verbaandert-Melchior tiltmeters), conventionally require...
Estimation with Weak Instruments: Accuracy of Higher Order Bias and MSE Approximations
weak instruments higher order expansions
2015/9/22
In this paper we consider parameter estimation in a linear simultaneous equations model. It
is well known that two stage least squares (2SLS) estimators may perform poorly when the
instruments are w...
The application of a novel open, windowless cell for the photoacoustic infrared spectroscopy of human skin is described. This windowless cavity is tuned for optimum performance in the ultrasound range...
1987年,两位研究人员带着一个简单的目标开创了DI公司——制造大量操作简便的Scan-ning Probe Microscope(SPM),使科学家和工程师们能够对以前无法观察到的纳米尺度的物质表面结构及特性进行成像和探索。他们成功地制造了世界上第一台商用STM,并于同年生产出第一台Nanoscope,此后又在1989年推出第一台AtomicForce Microscope(AFM),为非导电性...