Construction of the measurement system and its experimental study for diagnosing cerebral functional disorders using eye-sensing HMD

2003 ◽  
Author(s):  
H. Ishii ◽  
Y. Okada ◽  
H. Shimoda ◽  
H. Yoshikawa
Keyword(s):  
Experimental Study ◽  
Measurement System ◽  
Functional Disorders

Experimental Study of Multiphase Flow in Cold Box Core Process

2000 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Ruel A. Overfelt
Keyword(s):  
Experimental Study ◽  
Multiphase Flow ◽  
Measurement System ◽  
Pressure Measurement ◽  
Test Specimen ◽  
Filling Process ◽  
Cold Box ◽  
Pressure Measurement System ◽  
Sand Deposition

Abstract The results of experimental study of pressure variations inside core box during resin bonded sand filling process are reported. The test core specimens were produced using Laempe® Test Specimen Curing Machine L 1. A special pressure measurement system was designed and built with safety and portability requirements of the foundry environment. Special experiments were conducted to establish the effect of sand deposition on vent permeability.

Experimental study of a low-thrust measurement system for thruster ground tests

2014 ◽  
Vol 85 (3) ◽  
pp. 035102 ◽  
Author(s):  
Jingsong Gong ◽  
Lingyun Hou ◽  
Wenhua Zhao
Keyword(s):  
Experimental Study ◽  
Measurement System ◽  
Low Thrust ◽  
Thrust Measurement

scholarly journals Experimental Study of Spectral Induced Polarization Response Based on Laboratory Measurement

2018 ◽  
Vol 16 (2) ◽  
pp. 25
Author(s):  
Dicky Ahmad Zaky ◽  
Suparwoto Suparwoto
Keyword(s):  
Experimental Study ◽  
Grain Size ◽  
Measurement System ◽  
Test Sample ◽  
Induced Polarization ◽  
Spectral Parameters ◽  
Digital Oscilloscope ◽  
Spectral Induced Polarization ◽  
Voltage Amplifier ◽  
Size Model

The spectral induced polarization (SIP) method can provide apparent complex resistivity based on measurements of multi frequency. SIP method also can provide more detail information about physical properties of rocks and minerals because SIP can give spectral parameters or Cole-Cole parameters such as, changeability (m), time constant (τ) and frequency dependence (c). An Experimental study in laboratory has been conducted to knowing the SIP response of some test sample. The measurement system is built with digital oscilloscope Pico ADC-100 as device for sampling the input and output voltage. Amplifier is used to doubled up the signal and input differential. The range frequency of measurement is 10−2 Hz - 103 Hz. Porouspot Cu − CuSO4 is used to minimize the polarization at potential electrode. A Matlab listings is used to calculate the response of impedance and phase. The result from calibration that used the parallel circuit RC indicate that the measurement system was good. SIP response of porous model indicate that the response form an asymptotic resistivity, and the peak of phase is in the range frequency where the dispersion happen. The result also indicate that resistivity of small grain size model is larger than the big grain size model. Result from sample of mineralized rocks did not indicate a perfect SIP response, it is influenced by the contact between mineral and water was minimum.

A Study of Seam Topography Measurement System in 3D Butt Welding of Main Steel Structure

2013 ◽  
Vol 333-335 ◽  
pp. 126-129
Author(s):  
Heng Zhou Zhen ◽  
Yue Mei Han
Keyword(s):  
Experimental Study ◽  
Diode Laser ◽  
Measurement System ◽  
Steel Structure ◽  
Ccd Camera ◽  
Detection Algorithm ◽  
Integral Approach ◽  
Butt Welding ◽  
Telecentric Lens

In 3D butt welding of main steel structure, the accuracy of arc trajectory along the centre of seam and the distance between arc and seam are critical. Thus an accurate topography measurement system is important for controlling those parameters. In this paper, a seam topography measurement system for measuring seam topography of 3D main steel structure was developed using telecentric lens, CCD camera and diode laser. A detection algorithm was developed to detect seam topography based on grey projection integral approach. Experimental study shown that the seam topography measurement system could accurately measure the seam topography, seam width and detect seam boarder. The detection algorithm was also demonstrated with high self-verification ability.

scholarly journals A Study of Solder Joint Failure Criteria

2011 ◽  
Vol 2011 (1) ◽  
pp. 000694-000702 ◽  
Author(s):  
Jianbiao Pan ◽  
Julie Silk
Keyword(s):  
Experimental Study ◽  
Solder Joint ◽  
Measurement System ◽  
Natural Variation ◽  
Failure Criteria ◽  
Test Method ◽  
Resistance Change ◽  
Resistance Increase ◽  
Joint Reliability ◽  
Definition Of

One of the challenges in an experimental study of solder joint reliability is to determine when cracks occur in a solder joint or when a solder joint fails. Cracks in a real solder joint are difficult to identify using an X-Ray system. Cross-sectioning and scanning electron microscopy (SEM) is a destructive method. A common non-destructive test method is to monitor resistance increase in a solder joint or a daisy-chain. However, no scientific research has been done in establishing the relationship between the crack area of an interconnection and the change in resistance of the interconnection. This paper proposes a method of defining failure criteria as the resistance increase in a solder joint exceeding a threshold. The threshold is determined by k times the range over the natural variation in resistance measured by a measurement system. The natural variation by random cause is judged using X-bar and R charts. The principles of defining failure criteria are to be able to detect failure of solder joints as early as possible with minimum false detection due of measurement system error/variation. An experimental study confirmed that a full crack of an interconnection occurs when the increase of resistance in the interconnection is 10 times the natural variation of resistance change. The results of this study could be used to narrow the definition of failure in consensus standards IPC 9701A, JESD22-B111, and IPC/JEDEC-9702.

scholarly journals Prediction of developing temporomandibular joint dysfunction in patients with maxillary dental anomalies

2021 ◽  
Vol 38 (3) ◽  
pp. 41-47
Author(s):  
M. A. Danilova ◽  
P. V. Ishmurzin
Keyword(s):  
Experimental Study ◽  
Temporomandibular Joint ◽  
Sagittal Plane ◽  
Functional Disorder ◽  
Functional Disorders ◽  
Dental Anomalies ◽  
Joint Function ◽  
Temporomandibular Joint Dysfunction ◽  
Frontal Part ◽  
Preclinical Markers

Objective. To describe the basic predictors of developing dysfunction of temporomandibular joint (TMJ) in patients with maxillary dental anomalies. Materials and methods. An open, prospective, controlled clinical experimental study was carried out; 250 patients aged 18 to 35 (mean age 23.5 2.6 years) with maxillary dental anomalies including 134 persons with temporomandibular joint dysfunction and 116 with normal articular function were examined. Results. A multidimensional disperse analysis permitted to conclude that an extremely high (95100 %) probability of occurring temporomandibular joint dysfunction is determined with the presence of combination of two and more functional disorders with a complex of other (occlusive and cephalometric) preclinical markers of dysfunction; a high (7595 %) probability of development when one functional disorder is associated with a gnathic form of dentition occlusion anomaly; a medium degree (4575 %) of probability of occurring dysfunction with the presence of gnathic form of dentition occlusion anomaly with roentgenological changes in TMJ and the absence of functional signs; a low (1545 %) probability when detecting a dentoalveolar form of occlusion anomaly or dentition anomaly combined with roengenological changes in the joint and the absence of functional disorders; a very low (015 %) probability of dysfunction development with the presence of congested position of incisors, anomalies of separate teeth position in the sagittal plane in the frontal part and the absence of functional disorders. Conclusions. The knowledge of the above-mentioned predisposing factors (signs) of the disturbance of the joint function can be used as an instrument for prediction of the probability of developing the temporomandibular joint dysfunction in patients with maxillary dental anomalies.

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