Experimental Investigation on the Impact of Distorted Signal on Synthetic Jet

2016 ◽  
Vol 831 ◽  
pp. 104-111
Author(s):  
Paweł Gil
Keyword(s):  
Input Signal ◽  
Average Velocity ◽  
Fluid Velocity ◽  
Synthetic Jet ◽  
The Novel ◽  
Synthetic Jet Actuator ◽  
Negative Effect ◽  
Novel Method ◽  
Conventional Cooling ◽  
The Impact

Effective techniques for cooling electronic devices must deal with increasing heat loads associated with higher heat flux density. Many conventional cooling techniques like fan are reaching the limits of their effectiveness and shape. The novel method of heat transfer enhancement is synthetic jet. In this paper experimental results are presented. Synthetic jet actuator consist of STX 6.5 inch speaker installed in metacrylate chamber with circular orifice. The actuator was powered with signal from amplifier. The signal consist of basic sinusoidal function and THD noise added with some amplitude. The root mean square of signal voltage was constant 4V. The properties of synthetic jet were measured using constant temperature thermo-anemometer. Instantaneous velocity of air was measured in the orifice center and compared with input signal. Additional RMS and average velocity of air were measured. Measurement revealed that input signal of synthetic jet generator can contain some noise without effect on RMS and average velocity of air in the orifice. The THD less than 1% does not cause negative effect on synthetic jet fluid velocity.

scholarly journals AIRank: Author Impact Ranking through Positions in Collaboration Networks

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Jun Zhang ◽  
Yan Hu ◽  
Zhaolong Ning ◽  
Amr Tolba ◽  
Elsayed Elashkar ◽  
...  
Keyword(s):  
Impact Evaluation ◽  
The Novel ◽  
Interesting Phenomenon ◽  
Scientific Impact ◽  
Academic Networks ◽  
Novel Method ◽  
Academic Information ◽  
The Impact ◽  
In Virtue Of ◽  
Scientific Collaborations

Citation is a universally acknowledged way for scientific impact evaluation. However, due to its easy manipulability, simply relying on citation cannot objectively reflect the actual impact of scholars. Instead of citation, we utilize the academic networks, in virtue of their available and abundant academic information, to evaluate the scientific impact of scholars in this paper. Through the collaboration among scholars in academic networks, we notice an interesting phenomenon that scholars in some special positions can access more kinds of information and connect researchers from different groups to promote the scientific collaborations. However, this important fact is generally ignored by the existing approaches. Motivated by the observations above, we propose the novel method AIRank to evaluate the scientific impact of scholars. Our method not only considers the impact of scholars through the mutual reinforcement process in heterogeneous academic networks, but also integrates the structural holes theory and information entropy theory to depict the benefit that scholars obtain via their positions in the network. The experimental results demonstrate the effectiveness of AIRank in evaluating the impact of scholars more comprehensively and finding more top ranking scholars with interdisciplinary nature.

Novel Assessment Method for Support Conditions of Concrete Pavement under Traffic Loads using Distributed Optical Sensing Technology

2020 ◽  
Vol 2674 (4) ◽  
pp. 42-56
Author(s):  
Mengyuan Zeng ◽  
Difei Wu ◽  
Hongduo Zhao ◽  
Hui Chen ◽  
Zeying Bian
Keyword(s):  
Frequency Spectrum ◽  
Assessment Method ◽  
Concrete Pavement ◽  
The Novel ◽  
Moving Loads ◽  
Traffic Loads ◽  
Sensing Technology ◽  
Novel Method ◽  
Support Conditions ◽  
The Impact

Loss of support is a common concrete pavement distress that may affect pavement performance directly. Previous studies have proved that vibration-based methods have the potential for detecting loss of support in a more efficient way but this is limited by loading conditions. This paper presents a further study concerning the effects of moving loads and proposes a novel method for assessing support conditions of concrete pavement under traffic loads using distributed optical vibration sensing technology. First, finite element analysis and laboratory tests were conducted to investigate the impact of loss of support on pavement vibration induced by moving loads with reference to the frequency spectrum. The impact of loading conditions, including loading position and speed, was also studied using the same methods. The results indicate that both loss of support and loading characteristics have a considerable effect on the distribution of the frequency spectrum. It is proved that weighted frequency can be utilized for assessment of support conditions under a specific loading condition. It is suggested the loading position needs to be close to the measurement point (distance < 0.3 m) to obtain stable and reliable data for assessment of support conditions. In addition, the loading speed should be adequately fast and steady (4 to 5 m/s) to ensure the significance of the effect of loss of support. A field test was conducted in an airport, and the novel assessment method was validated by comparing it with a conventional deflection-based method. The novel method proved to be reliable for implementation in practice.

Interleukin-6 is a negative regulator of visfatin gene expression in 3T3-L1 adipocytes

2005 ◽  
Vol 289 (4) ◽  
pp. E586-E590 ◽  
Author(s):  
Susan Kralisch ◽  
Johannes Klein ◽  
Ulrike Lossner ◽  
Matthias Bluher ◽  
Ralf Paschke ◽  
...  
Keyword(s):  
Gene Expression ◽  
Plasma Concentrations ◽  
Negative Regulator ◽  
Mitogen Activated Protein Kinase ◽  
The Novel ◽  
Insulin Mimetic ◽  
Mitogen Activated Protein ◽  
Negative Effect ◽  
The Impact

Visfatin is a novel adipocytokine exerting insulin-mimetic effects in various insulin-sensitive tissues such as liver, muscle, and fat. In contrast, interleukin (IL)-6 is a proinflammatory adipose-secreted factor that induces insulin resistance and plasma concentrations that correlate with the development of type 2 diabetes mellitus. In the present study, the impact of IL-6 on visfatin gene expression in 3T3-L1 adipocytes was determined by quantitative real-time reverse transcription-polymerase chain reaction. Interestingly, 30 ng/ml IL-6 time-dependently downregulated visfatin synthesis with a significant 40% suppression seen after 4 h of treatment. Furthermore, the addition of IL-6 for 16 h dose-dependently suppressed visfatin mRNA with significant effects first observed at concentrations as low as 3 ng/ml and a maximal 43% reduction at 30 ng/ml effector. Moreover, inhibitor studies suggested that the negative effect of IL-6 on visfatin expression is, at least in part, mediated by p44/42 mitogen-activated protein kinase. In contrast, troglitazone did not reverse the negative effect of IL-6 on visfatin synthesis under these conditions. Taken together, our study suggests that IL-6 might influence glucose tolerance in part by regulation of the novel insulin-mimetic adipocytokine visfatin.

Synthetic Jet Actuator Cavity Acoustics: Helmholtz Versus Quarter-Wave Resonance

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Tyler Van Buren ◽  
Edward Whalen ◽  
Michael Amitay
Keyword(s):  
Acoustic Resonance ◽  
Synthetic Jet ◽  
Cavity Resonance ◽  
Synthetic Jet Actuator ◽  
Acoustic Cavity ◽  
Wave Resonance ◽  
Cavity Resonances ◽  
Quarter Wave ◽  
Cavity Acoustics ◽  
The Impact

The impact of cavity geometry on the source of acoustic resonance (Helmholtz or quarter-wave) for synthetic jet type cavities is presented. The cavity resonance was measured through externally excited microphone measurements. It was found that, for pancake-shaped cavities, the Helmholtz resonance equation was inadequate (off by more than 130%) at predicting the acoustic cavity resonances associated with synthetic jet actuation, whereas a two-dimensional quarter-wave resonance was accurate to 15%. The changes in the geometry (cavity diameter, cavity height, and orifice length) could alter the cavity resonance by up to 50%, and a finite element solver was accurate at predicting this resonance in all cases. With better knowledge of the phenomena governing the acoustic resonance, prediction of the cavity resonance can become more accurate and improvements to current prediction tools can be made.

Three-Phase Magnitude Detection Based on Decoupling Positive and Negative Sequences of Double D-Q Transformation

2013 ◽  
Vol 765-767 ◽  
pp. 2101-2104
Author(s):  
Xiao Ying Zhang ◽  
Zheng Jiang ◽  
Zhong Jian Zhou
Keyword(s):  
Time Lapse ◽  
Fundamental Wave ◽  
The Novel ◽  
Negative Sequence ◽  
Synchronous Reference Frame ◽  
Three Phase ◽  
Harmonic Pollution ◽  
Sequence Components ◽  
Novel Method ◽  
The Impact

This paper introduces T/4 time-lapse elimination detection, a novel method of detecting three-phase magnitude based on double d-q synchronous reference frame, functioning in decoupling positive and negative sequences of fundamental wave. When the voltage (or current) fundamental positive and negative sequence components are separated, their magnitudes can be detected respectively, so it is effective to restrain the impact on detection precision from negative sequence component. To verify the performance of this novel method, simulation experiments like transient response under normal grid condition and dynamic response under three-phase unbalance with harmonic pollution condition is finished. The results indicate that the novel method obtains a high precision of measure and a better dynamic property and has advantages on preventing harmonic propagation compared with T/16 time-lapse elimination detection method. Thus it can be wildly applied in three-phase power electronic devices.

The Optimization of Sintering Process for Alumina Extraction from Fly Ash

2014 ◽  
Vol 878 ◽  
pp. 264-270 ◽  
Author(s):  
Xiao Huan Wang ◽  
Bao Dong Wang ◽  
Yong Feng Xiao ◽  
Xiao Ting Liu ◽  
Li Jun Zhao ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Fly Ash ◽  
Six Sigma ◽  
Sintering Temperature ◽  
High Alumina ◽  
The Novel ◽  
Sintering Process ◽  
Novel Method ◽  
The Impact ◽  
Six Sigma Approach

The objective of paper is to optimize the variables of the sintering process with the six sigma philosophy. The impact of sintering temperature, Ca ratio, Na ratio and reaction time on the alumina reaching rate were primarily studied. In the research, a novel method was adopted to efficiently recover alumina and silica from high-alumina fly ash, and the response surface methodology of six sigma approach was also implemented to analysis the results obtained by the experiments. There is great significance to optimize sintering process for the industrialization of the novel method. Amount of energy consumption will be reduced in the production.

scholarly journals Determining Air Traffic Complexity – Challenges and Future Development

2020 ◽  
Vol 32 (4) ◽  
pp. 475-485
Author(s):  
Bruno Antulov-Fantulin ◽  
Biljana Juričić ◽  
Tomislav Radišić ◽  
Cem Çetek
Keyword(s):  
Future Development ◽  
Relevant Literature ◽  
Air Traffic ◽  
The Novel ◽  
Air Traffic Controller ◽  
Air Traffic Controllers ◽  
Static Images ◽  
Preliminary Communication ◽  
Novel Method ◽  
The Impact

Air traffic complexity is one of the main drivers of the air traffic controllers’ workload. With the forecasted increase of air traffic, the impact of complexity on the controllers' workload will be even more pronounced in the coming years. The existing models and methods for determining air traffic complexity have drawbacks and issues which are still an unsolved challenge. In this paper, an overview is given of the most relevant literature on air traffic complexity and improvements that can be done in this field. The existing issues have been tackled and new solutions have been given on how to improve the determination of air traffic complexity. A preliminary communication is given on the future development of a novel method for determining air traffic complexity with the aim of designing a new air traffic complexity model based on air traffic controller tasks. The novel method uses new solutions, such as air traffic controller tasks defined on pre-conflict resolution parameters, experiment design, static images of traffic situations and generic airspace to improve the existing air traffic complexity models.

scholarly journals Tablet Disintegration and Dispersion under In Vivo-like Hydrodynamic Conditions

Pharmaceutics ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 208
Author(s):  
Jan Lenz ◽  
Frederik Fuest ◽  
Jan Henrik Finke ◽  
Heike Bunjes ◽  
Arno Kwade ◽  
...  
Keyword(s):  
Fluid Velocity ◽  
Hydrodynamic Forces ◽  
Surface Erosion ◽  
Strong Impact ◽  
The Novel ◽  
Limited Information ◽  
Hydrodynamic Conditions ◽  
Tablet Disintegration ◽  
Novel Method

Disintegration and dispersion are functional properties of tablets relevant for the desired API release. The standard disintegration test (SDT) described in different pharmacopoeias provides only limited information on these complex processes. It is considered not to be comparable to the biorelevant conditions due to the frequent occurrence of high hydrodynamic forces, among other reasons. In this study, 3D tomographic laser-induced fluorescence imaging (3D Tomo-LIF) is applied to analyse tablet disintegration and dispersion. Disintegration time (DT) and time-resolved particle size distribution in close proximity to the tablet are determined in a continuously operated flow channel, adjustable to very low fluid velocities. A case study on tablets of different porosity, which are composed of pharmaceutical polymers labelled with a fluorescent dye, a filler, and disintegrants, is presented to demonstrate the functionality and precision of the novel method. DT results from 3D Tomo-LIF are compared with results from the SDT, confirming the analytical limitations of the pharmacopoeial disintegration test. Results from the 3D Tomo-LIF method proved a strong impact of fluid velocity on disintegration and dispersion. Generally, shorter DTs were determined when cross-linked sodium carboxymethly cellulose (NaCMCXL) was used as disintegrant compared to polyvinyl polypyrrolidone (PVPP). Tablets containing Kollidon VA64 were found to disintegrate by surface erosion. The novel method provides an in-depth understanding of the functional behaviour of the tablet material, composition and structural properties under in vivo-like hydrodynamic forces regarding disintegration and the temporal progress of dispersion. We consider the 3D Tomo-LIF in vitro method to be of improved biorelevance in terms of hydrodynamic conditions in the human stomach.

scholarly journals The impact of COVID-19 on the postgraduate exit examination in a clinical subject

2021 ◽  
Vol 8 (9) ◽  
pp. 1412
Author(s):  
Arundhati Diwan ◽  
V. P. Singh ◽  
Sampada Karne ◽  
Supriya Barsode ◽  
Varad Nadkarni
Keyword(s):  
Medical Education ◽  
The Novel ◽  
Exit Examination ◽  
Protective Measures ◽  
Case Presentation ◽  
Medical College ◽  
Physical Presence ◽  
Novel Method ◽  
The Impact ◽  
Student's Perceptions

The year 2020 world experienced the rise of a new pandemic COVID-19 beginning. It started in India in early March. Maharashtra state saw a lockdown from March 2020.  It has affected all the aspects of life in India including economy, patient care and medical education. The whole working system of hospitals had to be changed and most of the hospitals were divided into COVID and non-COVID parts. This article is an effort to study the perceptions of postgraduate medical students in the department of medicine on the exit examination at the end of three years of residency in a medical college in Pune. Along with the postgraduate student’s perceptions, views of examiners are also studied under four aspects protective measures during examination, assessment of knowledge using case scenarios, student’s experience of case presentation without physical presence of patients and overall satisfaction with the novel method of examination. 

scholarly journals Public participation in crisis policymaking. How 30,000 Dutch citizens advised their government on relaxing COVID-19 lockdown measures

2020 ◽  
Author(s):  
Niek Mouter ◽  
Jose Ignacio Hernandez ◽  
Anatol Valerian Itten
Keyword(s):  
Public Participation ◽  
Healthcare System ◽  
Good Method ◽  
The Novel ◽  
Value Evaluation ◽  
Government Decision ◽  
Novel Method ◽  
Societal Impacts ◽  
The Government ◽  
The Impact

AbstractFollowing the outbreak of COVID-19, governments took unprecedented measures to curb the spread of the virus. Public participation in decisions regarding (the relaxation of) these measures has been notably absent, despite being recommended in the literature. Here, as one of the exceptions, we report the results of 30,000 citizens advising the government on eight different possibilities for relaxing lockdown measures in the Netherlands. By making use of the novel method Participatory Value Evaluation (PVE), participants were asked to recommend which out of the eight options they prefer to be relaxed. Participants received information regarding the societal impacts of each relaxation option, such as the impact of the option on the healthcare system. The results of the PVE informed policymakers about people’s preferences regarding (the impacts of) the relaxation options. For instance, we established that participants assign an equal value to a reduction of 100 deaths among citizens younger than 70 years and a reduction of 168 deaths among citizens older than 70 years. We show how these preferences can be used to rank options in terms of desirability. Citizens advised to relax lockdown measures, but not to the point at which the healthcare system becomes heavily overloaded. We found wide support for prioritising the re-opening of contact professions. Conversely, participants disfavoured options to relax restrictions for specific groups of citizens as they found it important that decisions lead to “unity” and not to “division”. 80% of the participants state that PVE is a good method to let citizens participate in government decision-making on relaxing lockdown measures. Participants felt that they could express a nuanced opinion, communicate arguments, and appreciated the opportunity to evaluate relaxation options in comparison to each other while being informed about the consequences of each option. This increased their awareness of the dilemmas the government faces.

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