scholarly journals A new method of exact controllability in short time and applications

1989 ◽  
Vol 10 (3) ◽  
pp. 415-464 ◽  
Author(s):  
Vilmos Komornik
Keyword(s):  
Exact Controllability ◽  
New Method ◽  
Short Time

Recognition of Short Time Periods through Seriation

1977 ◽  
Vol 42 (4) ◽  
pp. 628-629 ◽  
Author(s):  
Clement W. Meighan
Keyword(s):  
Recent Article ◽  
Graphical Method ◽  
New Method ◽  
Time Discrimination ◽  
Time Periods ◽  
Short Time

One aspect of the recent article by Drennan (1976) merits some additional discussion. This has to do with the units of time that can be discriminated by seriation methods. One advance claimed for the new method proposed is that it allows for time placement within 25 years or so, stated as “ … finer than most traditional seriation.” In an article published 17 years ago, I showed this degree of time discrimination, with a much simpler graphical method of seriation.

scholarly journals Detecting Variable Resistance by Fluorescence Intensity Ratio Technology

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2400 ◽  
Author(s):  
Wanjun Sheng ◽  
Xiangfu Wang ◽  
Yong Tao ◽  
Xiaohong Yan
Keyword(s):  
Fluorescence Intensity ◽  
Intensity Ratio ◽  
Negative Temperature ◽  
Relative Sensitivity ◽  
New Method ◽  
Fluorescence Intensity Ratio ◽  
Time Intervals ◽  
Variable Resistance ◽  
Reduced Graphene ◽  
Short Time

We report a new method for detecting variable resistance during short time intervals by using an optical method. A novel variable-resistance sensor composed of up-conversion nanoparticles (NaYF4:Yb3+,Er3+) and reduced graphene oxide (RGO) is designed based on characteristics of a negative temperature coefficient (NTC) resistive element. The fluorescence intensity ratio (FIR) technology based on green and red emissions is used to detect variable resistance. Combining the Boltzmann distributing law with Steinhart–Hart equation, the FIR and relative sensitivity SR as a function of resistance can be defined. The maximum value of SR is 1.039 × 10−3/Ω. This work reports a new method for measuring variable resistance based on the experimental data from fluorescence spectrum.

Meshless - The Finite Element of a Direct Coupling Method Mechanical Problems in the Application

2012 ◽  
Vol 548 ◽  
pp. 421-424
Author(s):  
Jin Ping Wang ◽  
Yu Jing Gao ◽  
De Hua Wang
Keyword(s):  
Finite Element ◽  
Shape Function ◽  
Direct Coupling ◽  
Coupling Method ◽  
New Method ◽  
Field Function ◽  
The Core ◽  
Definition Of ◽  
Short Time ◽  
The Brain

Coupling method is developed in recent years to solve numerical problems a new method, meshless - the finite element of a direct coupling method is based on the definition of the generalized unit of coupling of the new method . The core of this method is the use of each unit in the shape function to the assumption that the brain that the whole sub-domain to be seeking to solve the unknown field function. Coupling with other compared with the method is simple to calculate the advantages of a short time.

scholarly journals A new method to specify the mitigated acoustic test conditions from flight telemetry based on the equivalence of vibro-acoustic response

2021 ◽  
Author(s):  
Shingo Shimazaki ◽  
Qinzhong Shi
Keyword(s):  
Response Spectrum ◽  
New Method ◽  
Time Varying ◽  
Launch Vehicles ◽  
Acoustic Response ◽  
Acoustic Environment ◽  
Extreme Stress ◽  
Test Conditions ◽  
Extreme Response ◽  
Short Time

AbstractGround acoustic tests using stationary sound pressure level spectrum have been conducted to verify the spacecraft survivability against acoustic environment acting on a spacecraft during launch, which is a non-stationary and random dynamic load. In general, a stationary spectrum used in ground acoustic test is traditionally determined by a method called maximax spectrum, which is the enveloped spectrum of time varying non-stationary short-time Fourier transform. However, the maximax spectrum is more or less an excessively conservative test condition because this spectrum focuses on processing of a time-varying acoustic signal itself to extract maximum value, rather than on how the vibro-acoustic response of an excited structure is. In this paper, a new method is proposed to specify a stationary spectrum equivalent to a structural vibro-acoustic response under a non-stationary and random acoustic environment based on extreme response spectrum and fatigue damage spectrum. This proposed method was applied to flight telemetry of both liquid- and solid-propellant launch vehicles developed by JAXA, to show its effect to mitigate the acoustic test conditions compared to the maximax spectrum while maintaining the equivalence of the structural vibro-acoustic response. Furthermore, the maximum predicted environment, which is the statistical upper percentiles of the flight telemetry of eight liquid-propellant launch vehicles, by the proposed method achieved a mitigation of about 2.5 and 6.8 dB in the extreme stress and cumulative fatigue, respectively, compared to the that which is calculated by the conventional maximax spectrum.

A New Method to Evaluate the Short-Time Withstand Current for Air Circuit Breaker

2008 ◽  
Vol E91-C (8) ◽  
pp. 1292-1298 ◽  
Author(s):  
H. XIANG ◽  
D. CHEN ◽  
X. LI ◽  
W. TONG
Keyword(s):  
Circuit Breaker ◽  
New Method ◽  
Air Circuit Breaker ◽  
Short Time

Keeping Ahead Professionally

1949 ◽  
Vol 42 (1) ◽  
pp. 39-40
Author(s):  
E. H. C. Hildebrandt
Keyword(s):  
Sodium Fluoride ◽  
New Method ◽  
Tooth Decay ◽  
Fluoride Solution ◽  
Short Time

A short time ago, I inquired of my dentist about the new method for preventing some of the tooth decay in children by the application of a weak sodium fluoride solution, whether this treatment would benefit my children, and whether he administered such treatments. He replied that experiments had shown that 40 per cent of tooth decay could be eliminated by applying this solution and that if I wished, he would be willing to apply this treatment to my children.

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