Results 71 to 80 of about 6,177,283 (209)

Detection of Debonding Defects in Carbon Fiber-Reinforced Polymer (CFRP)–Rubber Bonded Structures Based on Active Lamb Wave Energy Analysis

open access: yesSensors
Carbon fiber-reinforced polymers (CFRPs) are widely used in the fabrication of solid rocket motor casings due to their exceptional performance. However, the bonding interface between CFRP and viscoelastic materials (rubber) is prone to debonding damage ...
Zhenze Yang   +4 more
doaj   +1 more source

Quantitative Analysis of Piezoresistive Characteristic Based on a P-type 4H-SiC Epitaxial Layer

open access: yesMicromachines, 2019
In this work, the piezoresistive properties of heavily doped p-type 4H-SiC at room temperature were investigated innovatively. It was verified by a field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), and laser Raman spectroscopy
Yongwei Li   +8 more
doaj   +1 more source

Laboratory test methods for evaluating the fire response of aerospace materials [PDF]

open access: yes
The test methods which were developed or evaluated were intended to serve as means of comparing materials on the basis of specific responses under specific sets of test conditions, using apparatus, facilities, and personnel that would be within the ...
Hilado, C. J.
core   +1 more source

Wein bridge oscillator circuit [PDF]

open access: yes, 1971
Circuit with minimum number of components provides stable outputs of 2 to 8 volts at frequencies of .001 to 100 kHz. Oscillator exhibits low power consumption, portability, simplicity, and drive capability, it has application as loudspeaker tester and ...
Lipoma, P. C.
core   +1 more source

Thickness Dependence of Ferroelectric and Optical Properties in Pb(Zr0.53Ti0.47)O3 Thin Films

open access: yesSensors, 2019
As a promising functional material, ferroelectric Pb(ZrxTi1−x)O3 (PZT) are widely used in many optical and electronic devices. Remarkably, as the film thickness decreases, the materials’ properties deviate gradually from those of solid ...
Jian He   +8 more
doaj   +1 more source

Estimation of Kalman filter model parameters from an ensemble of tests [PDF]

open access: yes, 1980
A methodology for estimating initial mean and covariance parameters in a Kalman filter model from an ensemble of nonidentical tests is presented. In addition, the problem of estimating time constants and process noise levels is addressed.
Gibbs, B. P.   +4 more
core   +1 more source

HUBUNGAN ANTARA PERSEPSI SISWA TENTANG FASILITAS LABORATORIUM KOMPUTER DAN KEAKTIFAN BELAJAR SISWA DENGAN PRESTASI BELAJAR MATA PELAJARAN TEKNOLOGI INFORMASI DAN KOMUNIKASI (TIK) KELAS XI SMA NEGERI 1 GAMPING TAHUN AJARAN 2012/2013 [PDF]

open access: yes, 2013
This research has the purpose (1) determine the relationship between student perceptions about the computer laboratory facilities with ICT learning achievement of grade XI students of SMA Negeri 1 Gamping academic year 2012/2013, (2) determine the ...
M. Zumar, Arifin
core  

Testing and Data Reduction of the Chinese Small Telescope Array (CSTAR) for Dome A, Antarctica

open access: yes, 2010
The Chinese Small Telescope ARray (hereinafter CSTAR) is the first Chinese astronomical instrument on the Antarctic ice cap. The low temperature and low pressure testing of the data acquisition system was carried out in a laboratory refrigerator and on ...
Feng-Xiang Zhai   +22 more
core   +1 more source

Diaphragm-Free Fiber-Optic Fabry-Perot Interferometric Gas Pressure Sensor for High Temperature Application

open access: yesSensors, 2018
A diaphragm-free fiber-optic Fabry-Perot (FP) interferometric gas pressure sensor is designed and experimentally verified in this paper. The FP cavity was fabricated by inserting a well-cut fiber Bragg grating (FBG) and hollow silica tube (HST) from both
Hao Liang   +7 more
doaj   +1 more source

Nashbots: How Political Scientists have Underestimated Human Rationality, and How to Fix It [PDF]

open access: yes, 2016
Political scientists use experiments to test the predictions of game-theoretic models. In a typical experiment, each subject makes choices that determine her own earnings and the earnings of other subjects, with payments corresponding to the utility ...
Enemark, Daniel   +2 more
core   +1 more source

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