scholarly journals Effects of the Heater Winding on the Stability Tests of the Superconductor.

1993 ◽  
Vol 28 (11) ◽  
pp. 639-646 ◽  
Author(s):  
Katsuyuki KAIHO ◽  
Noboru HIGUCHI ◽  
Itaru ISHII ◽  
Hiroshi TATEISHI ◽  
Harehiko NOMURA ◽  
...  
Keyword(s):  
Stability Tests ◽  
The Stability

scholarly journals Influence of additives on suspension structure

2021 ◽  
Vol 10 (1) ◽  
pp. 37-40
Author(s):  
Vesna Savić ◽  
Milica Martinović ◽  
Ivana Nešić ◽  
Jelena Živković ◽  
Ivana Gajić
Keyword(s):  
Zinc Oxide ◽  
The Other ◽  
Stability Tests ◽  
Polysorbate 20 ◽  
The Stability ◽  
Carbomer Gel ◽  
Suspension Structure ◽  
Insight Into ◽  
Study Offer ◽  
Measured Hardness

The aim of this study was to compare the stability and texture of three zinc oxide suspensions with different additives. Suspension 1 was made as official magistral formulation Suspensio album 7.5% from Formulae magistrales 2008. Suspension 2 was prepared when 1% carbomer gel was added to suspension 1 and suspension 3 was prepared when polysorbate 20 was added to suspension 2. After stability tests, texture analysis was performed on all suspensions. Following parameters were measured: hardness cycle 1, hardness cycle 2, cohesiveness, adhesiveness, resilience and springiness. The study showed that suspension 3 had the lowest value of hardness, and therefore the best spreadability. Also, suspension 3 was the least sticky of all three, since it was characterized with the lowest adhesiveness. Further, suspension 3 was the most cohesive and is predicted to withstand the stress during packing and use longer than others. On the other hand, the highest values of resilience and springiness were detected for suspension 1, while the lowest was related to suspension 2. Therefore, the best textural characteristics were assigned to suspension 3. This result is in accordance with the results of performed stability tests. The results of our study offer insight into potential improvements of the current magistral formulation Suspensio album 7.5%.

scholarly journals Computer methods for stability analysis of the Roesser type model of 2D continuous-discrete linear systems

2012 ◽  
Vol 22 (2) ◽  
pp. 401-408 ◽  
Author(s):  
Mikołaj Busłowicz ◽  
Andrzej Ruszewski
Keyword(s):  
Stability Analysis ◽  
Asymptotic Stability ◽  
Linear Systems ◽  
Type Model ◽  
Stability Tests ◽  
Numerical Examples ◽  
Computer Methods ◽  
Discrete Linear Systems ◽  
Complex Functions ◽  
The Stability

Computer methods for stability analysis of the Roesser type model of 2D continuous-discrete linear systemsAsymptotic stability of models of 2D continuous-discrete linear systems is considered. Computer methods for investigation of the asymptotic stability of the Roesser type model are given. The methods require computation of eigenvalue-loci of complex matrices or evaluation of complex functions. The effectiveness of the stability tests is demonstrated on numerical examples.

scholarly journals Stability Tests of Agricultural and Operating Machines by Means of an Installation Composed by a Rotating Platform (the “Turntable”) with Four Weighting Quadrants

2020 ◽  
Vol 10 (11) ◽  
pp. 3786
Author(s):  
Marco Bietresato ◽  
Fabrizio Mazzetto
Keyword(s):  
Degrees Of Freedom ◽  
Structural Integrity ◽  
Support Surface ◽  
Rotating Platform ◽  
Technical Standards ◽  
Stability Tests ◽  
Support Plane ◽  
Stability Performance ◽  
Inclination Angles ◽  
The Stability

The stability of agricultural machines, earth-moving machines, snow-compaction machines and, in general, of all vehicles that may operate on sloping terrains is a very important technical feature and should not be underestimated. In fact, it is correlated, above all, to the safety of the operators, but also to the preservation of the structural integrity of these vehicles, to the prosecution of the activities and to the preservation of the economic investment. Although these facts are well-known, the international legislation and technical standards do not yet have a sufficient level of detail to give an all-inclusive quantification of the stability of the vehicle under examination in all its working conditions, e.g., at different inclination angles of the support surface, at different climbing angles of the vehicle on the slope, with different tires and inflating pressures, and on different terrains. Actual standards limit the stability tests to the experimental measurement of the lateral rollover angle only. Furthermore, the realization of unconventional test equipment able to widen the usually-tested scenarios could not be simple, due to the necessary size that such equipment should have (to perform tests not in scale) and to the related difficulties of handling full-scale vehicles. This work illustrates the applications of a new rig for testing the stability of vehicles, able to address all the above-illustrated issues and of possible future adoption to certify the stability performance of machines and perform homologations. This installation, named “rotating platform” or “turntable”, has the peculiarity of being able to move the machine positioned on it according to two rotational degrees of freedom: (1) overall inclination of the support plane, (2) rotation of the support plane around an axis perpendicular to the plane. The same installation is also designed to record the weight supported by each wheel of the machine placed on it (by means of four sensorized quadrants), both when the platform is motionless and while the above-described movements of tilt and rotation are being carried out, thus locating precisely the spatial position of the vehicle center of gravity. The presented physical-mathematical models highlight the great potential of this facility, anticipate the outcomes of the recordings that the experimenters will have at disposal when the test rig will be effectively active, and help the future understanding of trends of data, thus maximizing the available information content.

Stability of Single and Tandem Junction A-Si:H Solar Cells Grown using the ECR Process

1997 ◽  
Vol 467 ◽  
Author(s):  
Vikram L. Dalal ◽  
Tim Maxson ◽  
Robert Girvan ◽  
Sohail Haroon
Keyword(s):  
Solar Cells ◽  
Stability Studies ◽  
Stability Tests ◽  
High Hydrogen ◽  
Single Junction ◽  
Hydrogen Dilution ◽  
The Stability

ABSTRACTWe report on the fabrication and stability tests of single junction a-Si:H, and tandem junction a-Si:H/a-Si:H solar cells using the ECR process under high hydrogen dilution (H-ECR process). We show that devices with high fill factors can be made using the H-ECR process. We also report on the stability studies of the solar cells under 1 and 2-sun illumination conditions. The solar cells show very little degradation even after 500 hours of illumination under 2 x sunlight illumination.

scholarly journals Invariance Property of the Stability Test with respect to the Characteristic Impedance

2012 ◽  
Vol 2012 ◽  
pp. 1-4
Author(s):  
Amr A. Ibrahim ◽  
Ali M. Darwish ◽  
H. Alfred Hung
Keyword(s):  
Characteristic Impedance ◽  
Stability Test ◽  
Invariance Property ◽  
Crucial Importance ◽  
Input Output ◽  
Stability Tests ◽  
Output Terminal ◽  
The Stability

Stability of electrical amplifiers is of crucial importance. Among the popular stability tests is the μ-test which has many advantages over other tests like the K-Δ test. However, the value of μ parameter is dependent on the input/output terminal characteristic impedance used and this raises the concern that the predictions of the test are dependent on the choice of . This paper proves that the conclusions of the μ-test regarding stability/instability remain invariant with . This proof is necessary for gaining confidence in the results of the μ-test and should benefit circuit designers. Similar proofs should be extended to all other stability tests for additional insights into their validity under different circuit termination.

scholarly journals Stability algorithm for snow micro-penetrometer measurements

2009 ◽  
Vol 55 (193) ◽  
pp. 805-813 ◽  
Author(s):  
Sascha Bellaire ◽  
Christine Pielmeier ◽  
Martin Schneebeli ◽  
Jürg Schweizer
Keyword(s):  
High Resolution ◽  
Snow Cover ◽  
Rupture Strength ◽  
Stability Test ◽  
Critical Layer ◽  
Stability Tests ◽  
Snow Stratigraphy ◽  
Automatic Picking ◽  
Stability Classification ◽  
The Stability

AbstractInformation on snow-cover stability is important for predicting avalanche danger. Traditionally, stability evaluation is based on manual observations of snow stratigraphy and stability tests, which are time-consuming. The SnowMicroPen (SMP) is a high-resolution, constant-speed penetrometer to measure penetration resistance. We have analysed the resistance signal to derive snow stability. The proposed stability algorithm was developed by comparing 68 SMP force–distance profiles with the corresponding manual profiles, including stability tests. The algorithm identifies a set of four potentially weak layers by taking into account changes in structure and rupture strength of microstructural elements that make up snow layers as derived from the SMP signal. In 90% of the cases, one of the four potentially weak layers proposed by the algorithm coincided with the failure layer observed in the stability test. To select the critical layer from the four potential weaknesses was more difficult. With fully automatic picking of the critical layer, agreement with the failure layer observed in the stability test was reached in 60% of the cases. To derive a stability classification, we analysed weak-layer as well as slab properties. These predictor variables allow the SMP signal to be classified into two stability classes, poor and fair-to-good, with an accuracy of ∼75% when compared with observed stability. The SMP, in combination with the proposed algorithm, shows high potential for providing snow-cover stability information at high resolution in time and space.

Stability Tests for One, Two, and Multidimensional Linear Systems

1978 ◽  
Vol 100 (2) ◽  
pp. 105-109 ◽  
Author(s):  
E. I. Jury
Keyword(s):  
Linear Systems ◽  
Historical Review ◽  
Historical Background ◽  
Future Research ◽  
Feedback Systems ◽  
Stability Tests ◽  
Analytical Stability ◽  
Multidimensional Linear ◽  
Multidimensional Digital Filters ◽  
The Stability

This paper reviews analytical stability tests for one-dimensional linear systems since the early tests of E. J. Routh in his famous Adams Prize essay of 1877. The historical background of Routh’s stability test and criterion, as well as Fuller’s conjecture on its simplification, will be mentioned. In this historical review, the works of Hermite, Sylvester, Maxwell and others as related to the stability problem are also discussed. This review provides the context for a discussion of recent stability tests obtained for two-dimensional and multidimensional linear systems. These tests are described and their computational complexity is discussed in detail. In addition, the applications of stability testing to the study of two- and multidimensional digital filters, numerical analysis of stiff-differential equations, realization of mixed lumped and distributed parameter systems, and the design of output feedback systems will be briefly mentioned. Comments on future research in this area concludes the paper.

scholarly journals SYNTHESIS AND STABILITY TEST OF RESVERATROL-CONJUGATED GOLD NANOPARTICLE WITH POLYVINYL ALCOHOL STABILIZATION

2020 ◽  
pp. 221-229
Author(s):  
SUTRIYO SUTRIYO ◽  
RADITYA ISWANDANA ◽  
MARINA DWI HAFSHARI
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Physical Stability ◽  
Drug Efficacy ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Chloroauric Acid ◽  
Stability Tests ◽  
The Stability ◽  
Effective Site

Objective: Gold nanoparticles (AuNPs) have been developed as a promising effective site-specific drug to increase drug efficacy and reduce potentialside effects. However, AuNPs are unstable because they easily aggregate. This study aims to produce stable resveratrol (RSV)-conjugated AuNPs usingpolyvinyl alcohol (PVA).Methods: AuNPs were synthesized using the Turkevich method, which involves the reduction of chloroauric acid with sodium citrate as a reductor.AuNPs were then modified with PVA as a stabilizing agent and conjugated with RSV as a drug model in the carrier system. The formed conjugates werecharacterized using ultraviolet–visible spectrophotometry, Fourier transform infrared spectroscopy, particle size analysis, and high-performanceliquid chromatography. Furthermore, stability tests were performed in various media (2% bovine serum albumin [BSA], 1% cysteine, phosphatebufferedsaline [PBS] pH 4, PBS pH 7.4, and 0.9% NaCl) for 28 days.Results: RSV–AuNPs–PVA had a particle size of 78.75 nm, with polydispersity index (PDI) of 0.356, zeta potential of −36.1 mV, and highest entrapmentefficiency of 78.1%±0.7. RSV–AuNPs without PVA stabilization had a particle size of 51.97 nm, with PDI of 0.694 and zeta potential of −24.6 mV. Theresults of the stability tests demonstrated that RSV–AuNPs–PVA was stable in 2% BSA, PBS pH 7.4, PBS pH 4, and NaCl 0.9% and were unstable in 1%cysteine. RSV–AuNPs without PVA were stable in 2% BSA and PBS pH 7.4 and unstable in 1% cysteine, PBS pH 4, and 0.9% NaCl.Conclusion: PVA can improve the physical stability of RSV-AuNPs conjugates.

scholarly journals New stability conditions for positive continuous-discrete 2D linear systems

2011 ◽  
Vol 21 (3) ◽  
pp. 521-524 ◽  
Author(s):  
Tadeusz Kaczorek
Keyword(s):  
Asymptotic Stability ◽  
Linear Systems ◽  
Necessary Conditions ◽  
Sufficient Conditions ◽  
Necessary And Sufficient Conditions ◽  
Stability Conditions ◽  
Stability Tests ◽  
Numerical Examples ◽  
The Stability ◽  
Necessary And Sufficient

New stability conditions for positive continuous-discrete 2D linear systemsNew necessary and sufficient conditions for asymptotic stability of positive continuous-discrete 2D linear systems are established. Necessary conditions for the stability are also given. The stability tests are demonstrated on numerical examples.

Sign in / Sign up

Export Citation Format

Share Document