The Relationship between Voltage and Duration of Short-Time Arc Generated by Slowly Breaking Silver Contact

2008 ◽  
Vol E91-C (8) ◽  
pp. 1230-1232 ◽  
Author(s):  
Y. KAYANO ◽  
H. MIURA ◽  
K. MIYANAGA ◽  
H. INOUE
Keyword(s):  
Symmetry ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 329
Author(s):  
Jiufei Luo ◽  
Haitao Xu ◽  
Kai Zheng ◽  
Xinyi Li ◽  
Song Feng

Asymmetric windows are of increasing interest to researchers because of the nonlinear and adjustable phase response, as well as alterable time delay. Short-time phase distortion can provide an essential improvement in speech coding, and also has better performance in speech recognition. The merits of asymmetric windows in the aspect of spectral behaviors have an important function in frequency component detection and parameter estimation. In this paper, the phase response of windows were further studied, and the phase characteristics of symmetric and asymmetric windows are described. The relationship between the barycenter of windows in the time domain, and the phase characteristic at the center of the main lobe in the frequency domain, was established. In light of the relationship, an improved version of the asymmetric window- based frequency estimation algorithm was proposed. The improved algorithm has advantages of straightforward implementation and computational efficiency. The numeric simulation results also indicate that the improved approach is more robust than the traditional method against additive random noise.


2014 ◽  
Vol 2 (12) ◽  
pp. 7383-7408
Author(s):  
W. Liu ◽  
F. Yamazaki ◽  
M. Matsuoka ◽  
T. Nonaka ◽  
T. Sasagawa

Abstract. The Tohoku-Oki earthquake on 11 March 2011 caused significant widespread crustal movements. In a previous study, we proposed a method for capturing two-dimensional (2-D) surface displacements from a pair of pre- and post-event TerraSAR-X (TSX) intensity images. However, it is difficult to detect three-dimensional (3-D) displacements from one pair of TSX images. In this study, three pairs of pre- and post-event TSX images taken on different paths were used to estimate 3-D crustal movements. The relationship between the actual 3-D displacements and the converted 2-D movements in the SAR images was derived based on the observation model of a SAR sensor. The 3-D movements were then calculated from three sets of detected 2-D movements that occurred within a short time period. Compared with GPS observations, the proposed method was found to be capable of detecting the 3-D crustal movements with sub-pixel accuracy.


Author(s):  
Marianna Cherniavska

Background. The article is devoted to the piano work of the famous English pianist, teacher and composer Johann Baptist Kramer (1771–1858), whose 250th anniversary is celebrated in 2021. I. B. Kramer, like other pianists of the late XVIII – early XIX centuries, tried to solve a significant problem – mastering the basics of composition, its laws, principles, techniques, their combination with the game nature and capabilities of the piano. Objectives. The purpose of the article is to reveal the relationship between performing and compositional means in I. B. Kramer’s piano works. Methods. The basis of the methodology is a systematic approach, through which musicological research methods are combined with historical ones. The main document of the era in the field of musicological research is the musical text, so the analysis of musical works is carried out from the standpoint of performance at the levels of performing technical means, musical thinking of the composer and performer. Other components of the texture, the development of its individual layers in the whole system, as well as the coverage of one or another feature of the playing nature of the piano are also taken into account. Conclusions. I. B. Kramer’s pedagogical system is considered, which is a system of technical means of performance, which contributed to the embodiment of the game nature of the instrument. In works of art, the composer used these techniques as needed to create a certain figurative sphere. Analyzed “Pathetic Fantasy” op. 87 (1837), four notebooks Suite – arrangements for piano chamber works of classical composers, where the composer embodied ensemble thinking on the piano, introduced the principles of dialogicity and comparison of registers as a method of artistic development of musical material. Results. Continuing the work of his teacher M. Clementi, I. B. Kramer contributed to the development of concert activities in Europe, the differentiation of pedagogy, performance and composition into independent musical activities. His methodical works and opuses of etudes were the basis of pedagogy for the next generations of pianists, defined the foundations of piano pedagogy as a scientific discipline. The piano instructional material created by I. B. Kramer allowed to master the techniques of piano playing in a short time. Along with L. V. Beethoven, I. B. Kramer made an important contribution to deepening the content of musical works by means of composer’s writing. The perfection of the presentation of piano technique had a positive effect on the development of compositional techniques in the works of the musician – the development of contrasting themes, the principles of development of musical material, the improvement of musical forms. The sphere of dramatic pathos and heroism defined the image of pathos in music, which corresponded to the possibilities of the instrument and at the same time contributed to the formation of a romantic style in piano art.


2011 ◽  
Vol 50 (No. 6) ◽  
pp. 235-242 ◽  
Author(s):  
J. Matula

The objective of the paper was to determine an appropriate concentration of available sulphur in soil for the initial growth of plants. Based on previous researches two methods of soil extraction were used to acquire information on the soil reserve: water extraction (H<sub>2</sub>O 1:5, w/v) and extraction in 0.5M ammonium acetate with addition of NH<sub>4</sub>F (KVK-UF soil test). Spring barley was used as a test crop to determine the soil reserve of sulphur and its response to sulphur addition to the soil. A collection of 48 samples of topsoil from agriculturally important localities in the CR was made up for this purpose and the parameters of the nutrient status of the soil were remarkably different. A set of soils was used to establish short-time vegetation experiments in a plant growth chamber according to the scheme: A) control &ndash; without sulphur application and B) response variant with application of 30 mg S/kg of soil in the form of (NH)<sub>4</sub>SO<sub>4</sub>; nitrogen in variant A was adjusted by application of NH<sub>4</sub>Cl. Index of nutrient efficiency (IE = Y/N where Y = yield and N = nutrient concentration in the plant) and boundary lines of the point field were used to evaluate the efficiency of barley nutrition with sulphur. The efficient soil reserve of sulphur for the soil test H<sub>2</sub>O (1:5) when the ICP analytical technique was used was indicated in the range of 8&ndash;11 mg S/kg; 6&ndash;10 mg S/kg for sulphate detection on a SKALAR analyser. The efficient utilisation of sulphur by barley plants for the KVK-UF soil test was in the range of 7&ndash;12 mg S/kg. The conversion of the KVK-UF S-test to the index of soil reserve of sulphur by adding up a variable portion of the CEC value to the value of sulphur determined by the soil test (0.0167CEC + 9.1667) improved the closeness of the relationship between soil and plant.


2018 ◽  
Vol 210 ◽  
pp. 05010
Author(s):  
Xiaodong Zhuang ◽  
Nikos Mastorakis

A statistical study is implemented on the short-time spectrum of one main category of random signals. For the signals with massive and random micro-sources, a new statistic feature of the short-time amplitude spectrum is discovered, which reveals the relationship between the amplitude’s average and its standard for each frequency component. Moreover, the association between the amplitude distributions for different frequency components is also studied. A model representing such association is presented, which accords well with the statistic feature discovered. The analysis result has potential application in signal classification, and also in the study of system characteristics underlying the observed signal.


2014 ◽  
Vol 635-637 ◽  
pp. 502-506 ◽  
Author(s):  
Wei Min Zhuang ◽  
Qin Hua Xu

In order to improve the efficiency of the calculation of the whole car side impact finite element model,simplified model often used in research of B-pillar in passenger car. It is critical to establish a high accuracy simplified model in a short time. The relationship between the energy absorption of body parts and the calculation accuracy of simplified model was analyzed,and the result can be used as a guide for the establishment of simplified model.


2015 ◽  
Vol 10 (2) ◽  
pp. 123-133 ◽  
Author(s):  
Mohammadreza Sabzimaleki ◽  
Barat Ghobadian ◽  
Mohsen Mazloom Farsibaf ◽  
Gholamhassan Najafi ◽  
Masoud Dehghani Soufi ◽  
...  

Abstract Production of biodiesel from castor oil (CO) using ultrasound-assisted has been investigated in this study. The objective of the present work was therefore to determine the relationship between various important parameters of the alkaline-catalyzed transesterification process to obtain a high reaction yield in a short time. The response surface methodology (RSM) was used to statistically analyze and optimize the operating parameters of the process. A central composite design (CCD) was approved to study the effects of the reaction time, the methanol to oil molar ratio, the ultrasonic cycle and the ultrasonic amplitude on reaction yield. The optimum conditions for alkaline-catalyzed transesterification of CO was found to be a reaction time of 540 s, methanol to oil molar ratio of 8.15:1,ultrasonic cycle of 0.73% and ultrasonic amplitude 64.34%. By exerting the calculated optimum condition in the process, the reaction yield reached 87.0494%. The results from the RSM analysis indicated that the reaction time has the most significant effect on the reaction yield.


1948 ◽  
Vol 159 (1) ◽  
pp. 165-172 ◽  
Author(s):  
A. E. Johnson ◽  
H. J. Tapsell

A previous report gave the results of an experimental study of the relationship between short-time and long-time creep limits of a number of carbon steels. Certain conclusions were drawn which it was realized were not necessarily applicable to other types of steel. Similar experimental work has since been carried out on six carbon molybdenum steels, and the results obtained indicate similar limitations in the applicability of short-time creep limits to estimation of design stresses for long-time service, as were disclosed by the prior tests on carbon steels. There is not, at first sight, any reason why short-time and long-time creep limits should correlate, since with most engineering materials metallurgical changes occur during prolonged heating.


2021 ◽  
Vol 3 (32) ◽  
pp. 52-78
Author(s):  
Daniah Raqaban ◽  

The Saudi Arabian’s vision had uplifted the Saudi economy within a short time span by adopting different strategic legislation. One of the main adaptations by the Saudi government that assess this uplift was through adopting taxation. As a new legislation it was faced a lot of resistance by the citizen, which led to tax evasion. The study had conducted through mean of survey that focused on testing two main hypotheses to see the relationship between two main groups (morality and understanding) to tax evasion. As it showed the hypothesis was supported by the data collected that both the level of morality do plays a massive role in the perception of tax evasion; moreover, that the level of awareness the individuals have is low to medium level when it comes to understanding the tax rules and regulations.


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