Experimental study of electric field influence on low-temperature, long-time relaxation in crystalline ferroelectrics

1988 ◽  
Vol 73 (5-6) ◽  
pp. 407-419 ◽  
Author(s):  
S. Sahling ◽  
M. Koláč ◽  
A. Sahling
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Electric Field ◽  
Time Relaxation ◽  
Long Time ◽  
Field Influence

Experimental study of low-temperature long-time relaxation in epoxy resin

1987 ◽  
Vol 68 (3-4) ◽  
pp. 285-299 ◽  
Author(s):  
M. Koláč ◽  
B. S. Neganov ◽  
A. Sahling ◽  
S. Sahling
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Epoxy Resin ◽  
Time Relaxation ◽  
Long Time

Experimental Study of Low-Temperature Long-Time Relaxation in Epoxy Resin

1987 ◽  
Vol 26 (S3-2) ◽  
pp. 1699
Author(s):  
S. Sahling ◽  
A. Sahling ◽  
M. KOláč M. KOláč
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Epoxy Resin ◽  
Time Relaxation ◽  
Long Time

scholarly journals OPTIONS FOR FIRING UNDERDRIED CLAY VESSELS (EXPERIMENTAL STUDY)

2019 ◽  
Author(s):  
Е.В. Волкова
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Gradual Increase ◽  
Cattle Manure ◽  
Temperature Firing ◽  
Long Time ◽  
Reducing Environment ◽  
Optimal Formula

В данной статье обсуждается вопрос о возможности удачного обжига практически сырых глиняных сосудов в примитивных обжигательных устройствах: кострищах и очагах. Для исследования этого вопроса был поставлен эксперимент. Сосуды из трех разных формовочных масс с разной степенью высушености были обожжены в углубленном в грунт очаге в восстановительной среде длительное время (проведено 3 обжига) и в наземном очаге в полувосстановительной среде с использованием навоза коровы в качестве единственного топлива (1 обжиг). В результате автором были получены следующие выводы. Вопервых, для обжига в очаге с навозом в качестве основного топлива вполне пригодны сосуды 2 дневной сушки, т. е. практически сырые. Наилучшим образом обожглись сосуды, сделанные из глины и шамота. Для сосудов, слепленых из чистой глины и глины с навозом, имевший место подъем температуры был слишком резким и привел к образованию трещин. Возможно, при обжиге только во влажном навозе с более медленным подъемом температуры без трещин оказались бы все сосуды. Во вторых, можно считать почти установленным, что сосуды после 2 дневной сушки вполне пригодны для длительного низкотемпературного обжига в восстановительной среде. Но для полной веренности в этом необходимо проведение ряда дополнительных экспериментов. В третьих, оптимальным для обжига недосушенных сосудов является рецепт глина навоз шамот . The paper explores options for successful firing of basically wet clay vessels in primitive firing constructions such as fire pits and hearths. An experiment was carried out to study this issue. Vessels from three different masses of clay with different degrees of dryness were fired in a hearth sunk into soil in a reducing environment for a long time (three firings) and in a surface hearth in a partly reducing environment with the use of cattle manure as the only fuel (one firing). The following conclusions were derived. Firstly, firing in a hearth with manure as main fuel is quite suitable for vessels that were dried for two days, i. e. basically wet vessels. The best result from firing was obtained for vessels made from clay and chamotte. The increase in temperature was too steep for vessels made from pure clay and clay with manure resulting in cracks. Maybe, there would have been no cracks in any vessels in case of firing in wet manure with a more gradual increase in temperature. Secondly, it was established that, after two days of drying, vessels were quite ready for lengthy low temperature firing in a reducing environment. However, to be absolutely sure in this, additional experiments are needed. Thirdly, an optimal formula for firing underdried vessels is as follows: clay mature chamotte.

Low temperature long-time relaxation in glasses

1988 ◽  
Vol 65 (9) ◽  
pp. 1031-1033 ◽  
Author(s):  
S. Sahling ◽  
A. Sahling ◽  
M. Koláč
Keyword(s):  
Low Temperature ◽  
Time Relaxation ◽  
Long Time

scholarly journals Factors Affecting the Dependency of Shear Strain of LRB and SHDR: Experimental Study

Actuators ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 98
Author(s):  
Chao-Yong Shen ◽  
Xiang-Yun Huang ◽  
Yang-Yang Chen ◽  
Yu-Hong Ma
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Shear Strain ◽  
Loading Frequency ◽  
Loading Test ◽  
Characteristic Strength ◽  
Rubber Bearing ◽  
Dominant Feature ◽  
Loading Sequence ◽  
G Value

In this research we conducted a sensitivity experimental study where we explored the dependency of the shear strain on the seismic properties of bearings, namely lead rubber bearing (LRB) and super high damping rubber bearing (SHDR). The factors studied were vertical pressure, temperature, shear modulus of the inner rubber (G value), loading frequency, and loading sequence. Six specimens were adopted, i.e., three LRBs and three SHDR bearings. A series of test plans were designed. The seismic characteristics of the bearings were captured through a cyclic loading test, which included post-yield stiffness, characteristic strength, area of a single cycle of the hysteretic loop, equivalent stiffness, and equivalent damping ratio. A whole analysis of variances was then conducted. At the same time, to explore certain phenomena caused by the factors, an extended discussion was carried out. Test results showed that the temperature is the most dominant feature, whereas the G value is the least contributing factor, with the effect of the loading frequency and the loading sequence found between these two. The increment of the post-yielded stiffness for LRB from 100% to 25% is a significant reduction from a low temperature to high one. The slope of the characteristic strength versus the shear strain for LRB under high temperature is larger than the one under low temperature.

scholarly journals Spectroscopic analysis of high electric field enhanced ionization in laser filaments in air for corona guiding

2016 ◽  
Vol 4 ◽  
Author(s):  
Yingxia Wei ◽  
Yaoxiang Liu ◽  
Tie-Jun Wang ◽  
Na Chen ◽  
Jingjing Ju ◽  
...  
Keyword(s):  
Experimental Study ◽  
Femtosecond Laser ◽  
Electric Field ◽  
Corona Discharge ◽  
High Voltage ◽  
Fluorescence Spectra ◽  
Spectroscopic Analysis ◽  
Laser Pulses ◽  
Spectroscopic Measurement ◽  
High Electric Field

We report on a systematic experimental study on the fluorescence spectra produced from a femtosecond laser filament in air under a high electric field. The electric field alone was strong enough to create corona discharge (CD). Fluorescence spectra from neutral and ionic air molecules were measured and compared with pure high-voltage CD and pure laser filamentation (FIL). Among them, high electric field assisted laser FIL produced nitrogen fluorescence more efficiently than either pure CD or pure FIL processes. The nonlinear enhancement of fluorescence from the interaction of the laser filament and corona discharging electric field resulted in a more efficient ionization along the laser filament zone, which was confirmed by the spectroscopic measurement of both ionization-induced fluorescence and plasma-scattered 800 nm laser pulses. This is believed to be the key precursor process for filament-guided discharge.

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