Experimental Study on Journal Gas Bearing with Axial Slot for a Miniature Air Turboexpander

2012 ◽  
Vol 220-223 ◽  
pp. 611-614
Author(s):  
Ru Gang Chen ◽  
Ya Jun Nie ◽  
Quan Zhou ◽  
Chao Gong ◽  
Tao Chen
Keyword(s):  
Experimental Study ◽  
Instability Threshold ◽  
Radial Clearance ◽  
Experimental Investigations ◽  
New Type ◽  
The Stability ◽  
The Relationship ◽  
Gas Bearing

A new type of hydrostatic journal gas bearing with axial slot of tangential gas entry for miniature air turboexpander is firstly developed in this paper. This bearing configuration is presented and constructed to fit manufacture simplicity. The experimental investigations are carried out to reveal the relationship between bearing parameters and instability threshold speed. It is feasible to increase the stability of hydrostatic journal gas bearing by adopting this kind of configuration with axial slot of tangential gas entry. Some valuable tested results are obtained to reveal the optimum slot height and radial clearance for this miniature air turboexpander.

Partner-Specific Dependency and Guilt as Predictors of Forgiveness in Spanish University Women

2019 ◽  
Vol 22 ◽  
Author(s):  
Ana M. Beltrán-Morillas ◽  
Inmaculada Valor-Segura ◽  
Francisca Expósito
Keyword(s):  
Experimental Study ◽  
Romantic Relationships ◽  
Physical Violence ◽  
Sexual Infidelity ◽  
University Women ◽  
Interpersonal Transgressions ◽  
The Face ◽  
The Stability ◽  
The Relationship

AbstractInterpersonal transgressions often threaten the stability of the relationship. Within the scope of romantic relationships, physical violence and sexual infidelity have been considered the most difficult transgressions to forgive. Similarly, two variables considered relevant for forgiveness within the context of the couple are partner-specific dependency and the guilt experienced by the offended person. In that way, this research aims to approach the understanding of the forgiveness process of such transgressions. To this end, an experimental study was designed (N= 173 university women;Mage= 21.36,SD= 2.83), by which three indicators of forgiveness corresponding to the Transgression-Related Interpersonal Motivations Scale–18–Item Form (TRIM–18; “Revenge”, “Avoidance” and “Benevolence”), partner-specific dependency and sense of guilt of the offended person were examined in the face of the transgressions of physical violence and sexual infidelity. Results revealed that violence (vs. infidelity) is less forgiven (higher “Revenge”,p= .017, ηp2= .034). In addition, the results showed that high partner-specific dependency leads to further guilt which, in turn, leads to greater forgiveness towards the partner (less “Avoidance”,CIE= –.094,SE= .042, 95% CI [–.201, –.029]; and higher “Benevolence”,CIE= .080,SE= .037, 95% CI [.024, .173]) in light of violence (vs. infidelity). Last but not least, the previous findings and their possible implications for romantic relationships are discussed.

Stability and Collapsing Mechanism of Cavitation-Induced Nanobubbles in Simulated Extra-Cellular Matrix (ECM) Near Neuron

2016 ◽  
Author(s):  
Y.-T. Wu ◽  
A. Adnan
Keyword(s):  
Extra Cellular Matrix ◽  
Bubble Collapse ◽  
Experimental Investigations ◽  
Perineuronal Nets ◽  
Neuron Damage ◽  
The Stability ◽  
The Relationship ◽  
Fluid Interaction ◽  
Cellular Matrix

In blast-induced traumatic brain injury, shock waves (SW) play an important role along with cavitation phenomena. Due to the lack of reliable and reproducible experimental investigations, we have a limited understanding of the role of cavitation in brain damage. The present study aims to develop an atomistic simulation model to determine the role of shock-induced impulse and different constituents of the brain’s extra-cellular matrix (ECM) on the formation mechanism, stability and collapsing mechanism of nanobubbles in the ECM. The ECM in the brain can be divided into three major types depending on their location behind the blood-brain barrier, namely (a) the basement membrane (basal lamina), (b) the perineuronal nets and (3) the neural interstitial matrix. In this paper, we have studied the interaction of nanobubbles with bio-molecules of the perineuronal nets. We have chosen this zone of the ECM because we are interested to obtain the role of cavitation bubble collapse in neuron damage. Most biomolecules of perineuronal nets are slender in shape and flexible which is believed to induce special solid-fluid interaction between the fluid domain and the solid domain within the ECM. In addition, perineuronal nets contain a significant number of sodium ions. The relationship between sodium ion and solid-like constituents of perineuronal nets on the stability and the collapsing mechanism of nanobubbles will be discussed.

Vibration Analysis of New Type Pipeline-Cleaning Robot

2010 ◽  
Vol 139-141 ◽  
pp. 2172-2177
Author(s):  
Qing Zhong He ◽  
Wen Chun Zhao ◽  
Jia Wang ◽  
Yan Ling Zhang ◽  
Ming Chao Wang
Keyword(s):  
Experimental Study ◽  
Dynamic Simulation ◽  
Dynamic Characteristics ◽  
Simulation Study ◽  
Vibration Analysis ◽  
Simulation Software ◽  
Control Module ◽  
Cleaning Robot ◽  
New Type ◽  
The Stability

The new type of pipeline-cleaning robot discussed in this paper is developed to clean pipelines within the diameter range 200mm-250mm, which is propelled by using screw locomotion. With the help of CATIA, the modeling & simulation software, the simulation model of the robot and its vibration analysis has been obtained. From the analysis, dynamic characteristics of pipeline robot vary with the output parameters of control module and the structures of robot joints. Stimulated vibration has very little influences on the whole machine. The stability and reliability of the robot have been proven. According to the experimental study of principle prototype and dynamic simulation study of the virtual prototype, dynamic characteristics can be improved by optimizing the structures of robot and the related output parameters of control module, which contributes to the improvement of its motion stability. Therefore, it is believed that the robot has great value in practical use.

Experimental Study on a New Type of Cooling Device Used in High Heat Dissipation of CPU

2012 ◽  
Vol 241-244 ◽  
pp. 156-159
Author(s):  
Meng Liu ◽  
Fang Wang ◽  
Lei Lou ◽  
Sheng Liang Dai ◽  
Wei Feng Da
Keyword(s):  
Experimental Study ◽  
Temperature Distribution ◽  
Heat Dissipation ◽  
Evaporative Cooling ◽  
High Heat ◽  
Air Cooling ◽  
Cooling Device ◽  
New Type ◽  
The Stability ◽  
Temperature Test

A new type of cooling device used for server is designed in this paper. A small type of server is taken as a research object to compare the effect of air cooling and evaporative cooling under different CPU power consumption. The effects of this research are discussed on evaporative cooling for the stability of the CPU heat dissipation and the cooler on other components. The results show that the temperature distribution of the server’s case is more uniform and the temperature test of the CPU is more stable when it is cooled by evaporative cooling.

Stability Threshold of Flexibly Supported Hybrid Gas Journal Bearings

1979 ◽  
Vol 101 (4) ◽  
pp. 451-457 ◽  
Author(s):  
Zbyszko Kazimierski ◽  
Krzysztof Jarzecki
Keyword(s):  
Dynamic Properties ◽  
Theoretical Calculations ◽  
Journal Bearings ◽  
Experimental Investigations ◽  
Elastic Supports ◽  
Stability Threshold ◽  
The Stability ◽  
Elastically Supported ◽  
Gas Bearing ◽  
Bearing System

Results of experimental investigations of the dynamic properties of elastic supports for gas bearings having the form of rubber O-rings are presented. Theoretical calculations of the stability threshold of an externally pressurized gas bearing system elastically supported by means of O-rings were performed. An experimental investigation of the stability threshold of this gas bearing system was made. Comparisons between theoretical and experimental results verify the theoretical model and illustrate the possibility of its application to design purposes.

An Experimental Investigation on Thermal Conductivity and Viscosity of Graphene doped CNTs /TiO2 Nanofluid

2020 ◽  
Vol 17 (3) ◽  
Author(s):  
A.M. Zetty Akhtar ◽  
M.M. Rahman ◽  
K. Kadirgama ◽  
M.A. Maleque
Keyword(s):  
Thermal Conductivity ◽  
Zeta Potential ◽  
Base Fluid ◽  
Minimum Quantity Lubrication ◽  
Cutting Fluid ◽  
Cutting Zone ◽  
Observation Method ◽  
The Stability ◽  
The Relationship ◽  
Zeta Potential Analysis

This paper presents the findings of the stability, thermal conductivity and viscosity of CNTs (doped with 10 wt% graphene)- TiO2 hybrid nanofluids under various concentrations. While the usage of cutting fluid in machining operation is necessary for removing the heat generated at the cutting zone, the excessive use of it could lead to environmental and health issue to the operators. Therefore, the minimum quantity lubrication (MQL) to replace the conventional flooding was introduced. The MQL method minimises the usage of cutting fluid as a step to achieve a cleaner environment and sustainable machining. However, the low thermal conductivity of the base fluid in the MQL system caused the insufficient removal of heat generated in the cutting zone. Addition of nanoparticles to the base fluid was then introduced to enhance the performance of cutting fluids. The ethylene glycol used as the base fluid, titanium dioxide (TiO2) and carbon nanotubes (CNTs) nanoparticle mixed to produce nanofluids with concentrations of 0.02 to 0.1 wt.% with an interval of 0.02 wt%. The mixing ratio of TiO2: CNTs was 90:10 and ratio of SDBS (surfactant): CNTs was 10:1. The stability of nanofluid checked using observation method and zeta potential analysis. The thermal conductivity and viscosity of suspension were measured at a temperature range between 30˚C to 70˚C (with increment of 10˚C) to determine the relationship between concentration and temperature on nanofluid’s thermal physical properties. Based on the results obtained, zeta potential value for nanofluid range from -50 to -70 mV indicates a good stability of the suspension. Thermal conductivity of nanofluid increases as an increase of temperature and enhancement ratio is within the range of 1.51 to 4.53 compared to the base fluid. Meanwhile, the viscosity of nanofluid shows decrements with an increase of the temperature remarks significant advantage in pumping power. The developed nanofluid in this study found to be stable with enhanced thermal conductivity and decrease in viscosity, which at once make it possible to be use as nanolubricant in machining operation.

Quantity judgment and the mass-count distinction across languages: Advances, problems, and future directions for research

2018 ◽  
Author(s):  
David Barner ◽  
Alan Bale
Keyword(s):  
Experimental Study ◽  
Judgment Task ◽  
Scientific Enterprise ◽  
Future Directions ◽  
Quantity Judgment ◽  
The Relationship ◽  
Linguistic Cognition

We review advances in the experimental study of the mass-count distinction and highlight problems that have emerged. First, we lay out what we see to be the scientific enterprise of studying the syntax and semantics of mass-count distinction, and the assumptions we believe must be made if additional progress is to occur, especially as the empirical facts continue to grow in number and complexity. Second, we discuss the new landscape of cross-linguistic results that has been created by widespread use of the quantity judgment task, and what these results tell us about the nature of the mass-count distinction. Finally, we discuss the relationship between the mass-count distinction and non-linguistic cognition, and in particular the object-substance distinction.

A FORECAST OF PRODUCTIVE LONGEVITY OF HOLSTEIN COWS BY INDIRECT SIGNS

2020 ◽  
Author(s):  
З.С. САНОВА
Keyword(s):  
Correlation Coefficient ◽  
Aging Process ◽  
Direct Relationship ◽  
Stability Index ◽  
Age At First Calving ◽  
Group I ◽  
Predicted Values ◽  
The Stability ◽  
Relationship Of ◽  
The Relationship

В статье представлены материалы о взаимосвязи продолжительности продуктивного использования коров с характеристикой устойчивости к деградации, с возрастом отела и удоем. В исследованной, разнородной по происхождению, группе животных для прогноза продуктивного периода коров, обусловленного устойчивостью к деградации и возрастом первого отела, пригодно уравнение регрессии, аргументами в котором являются индекс устойчивости, возраст первого отела в первой и второй степенях. Коэффициент корреляции межу предсказанными значениями продуктивного периода и его фактическими величинами в I группе составляет 0,502, во II - 0,604. При этом крайние варианты прогнозируются со статистическими ошибками 5 мес при оценке индекса устойчивости по 2 лактациям и 4,1 мес по 3, а средние варианты, соответственно, 1,6 и 1,51 мес. Индекс устойчивости к процессу старения является важной характеристикой биологических особенностей коров, определяющий их продуктивное долголетие. Его оценка по первым 2 и 3 лактациям имеет прямолинейную связь с продуктивным периодом (r=0,4109 и r=0,5270), соответственно. Зависимость продуктивного периода от возраста первого отела криволинейная — с увеличением возраста первого отела сокращается срок продуктивного использования, при возрасте первого отела более 1400 дней срок продуктивного использования колеблется от 1,33 до 1,41 лактации. Коэффициент корреляции между этими характеристиками коров составляет - 0,2164 в I и - 0,2620 во II группах. The article presents materials about the relationship of the duration of productive use of cows with the characteristic of resistance to degradation, with the age of calving and milk yield. In the studied group of animals, which is heterogeneous in origin, the regression equation is suitable for predicting the productive period of cows due to resistance to degradation and the age of the first calving, the arguments of which are the stability index, the age of the first calving in the first and second degrees. The correlation coefficient between the predicted values of the productive period and its actual values in group I is 0.502, in group II - 0.604. At the same time, the extreme variants are predicted with statistical errors of 5 months when evaluating the stability index for 2 lactations and 4.1 months for 3, and the average variants, respectively, are 1.6 and 1.51 months. The index of resistance to the aging process is an important characteristic of the biological characteristics of cows, which determines their productive longevity. Its estimate for the first 2 and 3 lactations has a direct relationship with the productive period (r=0.4109 and r=0.5270), respectively. The dependence of the productive period age at first calving curvilinear with increasing age at first calving reduces the time to productive use, while age at first calving of more than 1400 days, the period of productive use ranges from 1.33 to 1.41 lactation. The correlation coefficient between these characteristics of cows is-0.2164 in I and-0.2620 in II groups.

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