Effect of electrical stimulation of the crossed olivocochlear bundle on temporary threshold shifts in auditory sensitivity. II. Dependence on the level of temporary threshold shifts

1988 ◽  
Vol 60 (2) ◽  
pp. 569-579 ◽  
Author(s):  
R. Rajan
Keyword(s):  
Sound Pressure ◽  
Standard Stimulus ◽  
Detailed Examination ◽  
Low Level ◽  
Olivocochlear Bundle ◽  
Summating Potential ◽  
Site Of Action ◽  
Two Parameters ◽  
The Relationship ◽  
Maximum Threshold

1. This report presents a more detailed examination of crossed olivocochlear bundle (COCB) effects on temporary threshold shifts (TTS). The principal aim was to establish the details of the relationship between the effects of continuous COCB stimulation and the TTS caused by various exposures. Initially, in various groups, different intensities of a 1-min exposure were presented with or without COCB stimulation. Stimulation at any particular rate caused greatest reductions in TTS to occur for the higher intensity exposures than for the lower intensity ones. Thus COCB stimulation at 140 pulses/s reduced maximum threshold losses by the following amounts: 13.33 [106 dB sound pressure level (SPL) exposure], 13.29 (103 dB SPL exposure), 8.9 (101 dB SPL exposure), and 0.77 dB (97 dB SPL exposure). 2. The effect of COCB stimulation was also examined on a shorter duration (30 s) exposure causing TTS intermediate between that due to 1-min exposure at 97 dB SPL and that at 101 dB SPL. Reductions in TTS to the shorter duration exposure were not obtained with COCB stimulation at 140 pulses/s but only when the rate was increased to 260/s. 3. Thus COCB stimulation at any particular rate caused greatest reductions in TTS when the exposure would have caused a large amount of TTS, regardless of the intensity or duration of exposure. These two parameters of the exposure could be traded to provide a level of TTS that would be affected by a standard COCB stimulus. Low-level exposures that caused only small amounts of TTS were not affected by the standard COCB stimulus. As the level of the exposure, and therefore, the ensuing TTS, increased (with increased duration or intensity of exposure), the standard stimulus had greater effects. Increasing the rate of pulses in the COCB stimulus resulted in the low-level exposures now being affected. Even at the higher rate, greatest reductions in TTS were obtained when the exposure would have resulted in high levels of TTS. 4. In an attempt to determine the site of action of the continuous COCB stimulus the endocochlear potential (EP) and the summating potential (SP) were recorded from scala media of the basal turn while applying COCB stimuli similar to those used in the TTS experiments. Although the continuous COCB stimulus caused the traditional changes in the EP and SP associated with COCB stimulation with pulsed short electrical trains, these changes adapted quite rapidly and did not persist for the amount of time shown to be necessary for full reductions in TTS to be obtained.(ABSTRACT TRUNCATED AT 400 WORDS)

Effects of loading adjustment on the reliability degradation of composites

2011 ◽  
Vol 18 (1-2) ◽  
pp. 61-67
Author(s):  
Chung-Ling Chen ◽  
Kuo-Shong Wang
Keyword(s):  
Residual Strength ◽  
Failure Time ◽  
Transition Period ◽  
Strength Distribution ◽  
Low Level ◽  
Time Period ◽  
The Mean ◽  
Two Parameters ◽  
The Relationship ◽  
Good Agreement

AbstractThis paper defines two parameters to describe the effects of fatigue load adjustment on the reliability degradation of composites. The transition period, n2a, indicates the free failure time period from the instant of high-low adjustment until the residual strength distribution meets the low-level stress. The reliability drop, ∣ΔR∣, is shown at the instant of low-high adjustment. Based on the strength-life equal rank assumption, a typical Yang model of the residual strength is considered to derive these two items by retrieving the residual strength distributions to the corresponding initials. The predicted parameters are verified to be in good agreement with the Monte Carlo simulation of fatigue failure. It is found that n2a increases dramatically as the reliability Ra at which the stress level changes, in the range of 1>Ra>0.95. The relationship between ∣ΔR∣ and Ra exhibits a parabolic-like curve with a peak near the mean cycles to failure of the process at low-level stress.

Exergy analysis of a turboprop engine at different flight altitude and speeds using novel consideration

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali Dinc ◽  
Yousef Gharbia
Keyword(s):  
Fuel Consumption ◽  
Thermal Efficiency ◽  
Exergy Efficiency ◽  
Specific Fuel Consumption ◽  
Flight Altitude ◽  
Fuel Flow ◽  
Turboprop Engine ◽  
Shaft Power ◽  
Two Parameters ◽  
The Relationship

Abstract In this study, exergy efficiency calculations of a turboprop engine were performed together with main performance parameters such as shaft power, specific fuel consumption, fuel flow, thermal efficiency etc., for a range of flight altitude (0–14 km) and flight speeds (0–0.6 Mach). A novel exergy efficiency formula was derived in terms of specific fuel consumption and it is shown that these two parameters are inversely proportional to each other. Moreover, a novel exergy efficiency and thermal efficiency relation was also derived. The relationship showed that these two parameters are linearly proportional to each other. Exergy efficiency of the turboprop engine was found to be in the range of 23–33%. Thermal efficiency of the turboprop engine was found to be around 25–35%. Exergy efficiency is higher at higher speeds and altitude where the specific fuel consumption is lower. Conversely, exergy efficiency of the engine is lower for lower speeds and altitude where the specific fuel consumption is higher.

Derivation Mathematical Equations for Future Calculation of Potential Evapotranspiration in Iraq, A Review of Application of Thornthwaite Evapotranspiration

2019 ◽  
Vol 60 (5) ◽  
pp. 1037-1048
Author(s):  
Hussein Ilaibi Zamil Al-Sudani
Keyword(s):  
Water Balance ◽  
Potential Evapotranspiration ◽  
Coefficient Of Determination ◽  
Research Review ◽  
Climate Conditions ◽  
Average Temperature ◽  
Mean Temperature ◽  
Mathematical Equations ◽  
Two Parameters ◽  
The Relationship

     In any natural area or water body, evapotranspiration is one of the important outcomes in the water balance equation. As a significant method and depending on monthly average temperature, estimating of potential Evapotranspiration depending on Thornthwaite method was adopted in this research review. Estimate and discuss evapotranspiration by using Thornthwaite method is the main objectives of this research review with considerable details as well as compute potential evapotranspiration based on climatologically data obtained in Iraq. Temperature - evapotranspiration relationship can be estimated between those two parameters to reduce cost and time and facilitate calculation of water balance in lakes, river, and hydrogeological basins. The relationship was obtained using Thornthwaite method in Iraq by dividing the area into seven sectors according to geographic latitude. Each sector has multi meteorological stations where thirty two stations were used with different periods of records. A mathematical relationship was obtained between mean temperature and corrected potential evapotranspiration with (97.45) to (99.84) coefficient of determination. The mean temperature has a decreasing pattern from southern east towards northern west of Iraq affected by Mediterranean Sea climate conditions, while corrected potential evapotranspiration has the opposite direction regarding increased value because of a direct relationship with temperature.

scholarly journals THE RELATIONSHIP BETWEEN EMOTIONAL INTELLIGENCE AND LEADERSHIP QUALITIES IN STUDENTS

2020 ◽  
Keyword(s):  
Emotional Intelligence ◽  
Common Ground ◽  
Education Institution ◽  
Leadership Traits ◽  
Leadership Qualities ◽  
Organizational Skills ◽  
Low Level ◽  
Technical Students ◽  
High Level ◽  
The Relationship

In this article, the main approaches concerning the problem of leadership traits formation as studied in both national and foreign literature are viewed. There are given results of research on leadership traits in students at technical specialties and humanities in the course of their training at a higher education institution in their connection with emotive intellect. The peculiarities of leadership traits in the tested groups with different level of emotive intellect, as well as a connection between leadership traits and emotive intellect are determined. The highest indicators according to the results of the research are demonstrated by a group of students of technical specialties with a high level of emotional intelligence, which indicates the ability to manage their emotions and behavior, the ability to solve problems. They demonstrate a high level of organizational skills, ability to work with a group. Their actions are aimed at achieving goals. The lowest rates according to the results of the study were found in a group of students of humanities with a low level of emotional intelligence. In difficult situations, it is difficult for them to find a way out. They do not know how to control the work of their comrades, to find common ground with people. The relationship between emotional intelligence and leadership skills in students of technical and humanities has been studied. A group of technical students with a high level of emotional intelligence found positive correlations between emotional intelligence and all scales of leadership qualities. There are no correlations between emotional intelligence and leadership qualities in the group of humanities students with a low level of emotional intelligence. In other groups of students, certain correlations have been established between emotional intelligence and leadership qualities.

scholarly journals The Interdecadal Variations and Causes of the Relationship Between Autumn Precipitation Anomalies in Eastern China and SSTA Over the Southeastern Tropical Indian Ocean

2021 ◽  
Author(s):  
Liwei Huo ◽  
Zhaoyong Guan ◽  
Dachao Jin ◽  
Xi Liu ◽  
Xudong Wang ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Eastern China ◽  
Tropical Indian Ocean ◽  
The Other ◽  
Drought Event ◽  
Low Level ◽  
Rainfall Anomalies ◽  
Precipitation Anomalies ◽  
The Relationship ◽  
Southeastern Tropical Indian Ocean

Abstract Eastern China has a large population with rapid development of the economy, where is the important crop producing region. In this region, the spatial and temporal distribution of autumn rainfall in Eastern China is uneven, which has important societal impact. Using the NCEP–NCAR reanalysis and other observational datasets, it is found that the spatial distribution of the first EOF mode of autumn rainfall anomalies in eastern China is consistent across the region, with significant interannual variabilities. Pronounced interdecadal variations are presented in the relationship between autumn rainfall anomalies in eastern China and sea-surface temperature anomalies (SSTA) over the southeastern tropical Indian Ocean (SETIO). The interdecadal changes have been analyzed by considering two epochs: one during 1979-2004 and the other during 2005-2019. It shows weak and insignificant correlations between the autumn rainfall anomalies in eastern China and SSTA over SETIO during the first epoch. On the other hand, they are remarkable and positively correlated with each other during the second epoch. The inter-decadal changes of the above relationship are related to the warming of SST over SETIO during the second epoch. It causes stronger low-level convergence and ascending motion over SETIO, with the co-occurrence of enhanced western Pacific subtropical high and anomalous abundant moisture over eastern China carried by a low-level southerly anomaly originating from the South China Sea. Simultaneously, the local Hadley circulation over eastern China becomes weak, corresponding to the anomalous ascending motion. The collaboration of anomalous water vapour transport and ascending motion strengthens the connection between the SETIO SSTA and the autumn precipitation anomalies in eastern China, and vice versa. In the boreal autumn of 2019, entire eastern China suffered extreme drought. It suggests that this drought event in eastern China is strongly affected by the negative SSTA over SETIO, which is consistent with the statistical results.

scholarly journals Methods of Controlling Lift - off in Conductivity Invariance Phenomenon for Eddy Current Testing

2020 ◽  
Author(s):  
Zhongwen Jin ◽  
Yuwei Meng ◽  
Rongdong Yu ◽  
Ruochen Huang ◽  
Mingyang Lu ◽  
...  
Keyword(s):  
Linear Relationship ◽  
Eddy Current ◽  
Coating Thickness ◽  
Test Sample ◽  
Common Point ◽  
Coil Design ◽  
Current Testing ◽  
Lift Off ◽  
Two Parameters ◽  
The Relationship

<p>Previously, a conductivity invariance phenomena (CIP) has been discovered – at a certain lift-off, the inductance change of the sensor due to a test sample is immune to conductivity variations, i.e. the inductance – lift-off curve passes through a common point at a certain lift-off, termed as conductivity invariance lift-off. However, this conductivity invariance lift-off is fixed for a particular sensor setup, which is not convenient for various sample conditions. In this paper, we propose using two parameters in the coil design – the horizontal and vertical distances between the transmitter and the receiver to control the conductivity invariance lift-off. The relationship between these two parameters and the conductivity invariance lift-off is investigated by simulation and experiments and it has been found that there is an approximate linear relationship between these two parameters and the conductivity invariance lift-off. This is useful for applications where the measurements have restrictions on lift-off, e.g. uneven coating thickness which limits the range of the lift-off of probe during the measurements. Therefore, based on this relationship, it can be easier to adjust the configuration of the probe for a better inspection of the test samples.</p>

scholarly journals Adherence to Ethical Standards of Scientific Research and its Relation to Creativity in Educational Researches in the light of Some Demographic Variables: Exploratory Study

2019 ◽  
Vol 3 (2) ◽  
Author(s):  
Bushra Ismail Ahmed Arnaout
Keyword(s):  
Exploratory Study ◽  
Demographic Variables ◽  
Ethical Standards ◽  
Strong Positive Correlation ◽  
Low Level ◽  
Simple Regression Analysis ◽  
Number Of Publications ◽  
The Relationship ◽  
Scientific Degree ◽  
Simple Regression

This study aimed to determine the level of adherence to the research ethical standards and research creativity in psychological and educational studies, and to identify the nature of the relationship between adherence to ethical standards and research creativity, as well as to identify the differences in both adherence to the research ethical standards and research creativity due to (gender, scientific degree, number of publications) variables. The researcher selected a random sample of (142) of the researchers in psychological and educational disciplines. There ages ranged between (26- 57) years. The researcher applied the scale of adherence to the research ethical standards and scale of research creativity, all of these tools prepared by the researcher. The results showed that there was a low level of adherence to the research ethical standards as well as low level of research creativity. Also there was a statistical significant strong positive correlation between adherence to research ethical standards and research creativity (R = 0.945), and also found statistically significant differences (0.01) among the average scores in adherence to the research adherence to ethical standards and research creativity due to gender (in favor of females), Scientific degree (in favor of doctoral and post-doctoral researchers), and the number of published researches (in favor of researchers who published more than 6 research and more who are publish more than Of 10 research). The results of the simple regression analysis also indicated that adherence to the research ethical standards is a statistical and powerful indicator of research creativity. The researcher explained the findings in light of the theoretical framework and previous studies, and developed a number of recommendations.

scholarly journals Growth and clorophyll content dynamics of winter wheat (Triticum aestivum L.) in different cropyear

2013 ◽  
pp. 101-105
Author(s):  
Enikő Vári
Keyword(s):  
Winter Wheat ◽  
Grain Filling ◽  
Triticum Aestivum L ◽  
Area Index ◽  
Rotation System ◽  
Crop Rotation System ◽  
Two Parameters ◽  
The University ◽  
The Relationship

The experiments were carried out at the Látókép experimental station of the University of Debrecen on chernozem soil in a long term winter wheat experiment in the season of 2011 and 2012 in triculture (pea-wheat-maize) and biculture (wheat-maize) at three fertilisation levels (control, N50+P35K40, N150+P105K120). Two different cropyears were compared (2011 and 2012). The research focused on the effects of forecrop and fertilisation on the Leaf Area Index, SPAD values and the amount of yield in two different cropyears. We wanted to find out how the examined parameters were affected by the cropyear and what the relationship was between these two parameters and the changes of the amount of yield. Examining the effects of growing doses of fertilizers applied, results showed that yields increased significantly in both rotations until the N150+PK level in 2011 and 2012. By comparing the two years, results show that in 2011 there was a greater difference in yields between the rotations (7742 kg ha-1 at N150+PK in the biculture and 9830 kg ha-1 at N150+PK in the triculture). Though wheat yields following peas were greater in 2012, results equalized later on at N150+PK levels (8109–8203 kg ha-1). Due to the favorable agrotechnical factors, the leaf and the effects of the treatments grown to a great extent in 2011, while in 2012 the differences between treatments were moderate. Until the N150+PK level, nitrogen fertilisation had a notable effect on the maximum amount of SPAD values (59.1 in the case of the biculture and 54.0 in the triculture). The highest SPAD values were measured at the end of May (during the time of flowering and grain filling) in the biculture. In the triculture, showed high SPAD values from the beginning. The same tendency could be observed in the 2012 cropyear, although increasing doses of fertilizers resulted in higher SPAD values until N150+PK level only from the second measurement. Maximum SPAD values were reached at the end of May in both crop rotation system

scholarly journals TO THE QUESTION ABOUT THE PREDICTORS OF VICTIM BEHAVIOR OF YOUNGER SCHOOL CHILDREN

2021 ◽  
pp. 176-184
Author(s):  
Ольга Федоровна Афанасьева
Keyword(s):  
School Children ◽  
Deviant Behavior ◽  
The State ◽  
Low Level ◽  
Primary Schoolchildren ◽  
Readiness To Learn ◽  
Complex Preparation ◽  
The Relationship

Рассматриваются аспекты виктимного поведения младших школьников, связанные с готовностью ребенка к обучению в школе, процессом его адаптации и проявлениями состояния тревожности. Обозначены психологические основания комплексной подготовки к школе и последствия низкого уровня готовности. Описываются результаты исследования, направленного на определение взаимосвязи недостаточной готовности к школе и уровня тревожности, которые могут стать причиной проявления отклоняющегося поведения, в частности виктимности. The aspects of victim behavior of primary schoolchildren are considered, which are connected with the child's readiness to learn at school, the process of his adaptation and manifestations of the state of anxiety. The psychological foundations of complex preparation for school and the consequences of a low level of readiness are outlined. The article describes the results of a study aimed at determining the relationship between insufficient readiness for school and the level of anxiety, which can cause the manifestation of deviant behavior, in particular, victimization.

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