Academic literature on the topic 'Period of stability'

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Journal articles on the topic "Period of stability"

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Yang, Xiao-Song, and Lei Wang. "Period-Increasing Indicates Loss of Stability." International Journal of Bifurcation and Chaos 29, no. 12 (November 2019): 1950159. http://dx.doi.org/10.1142/s0218127419501591.

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We first present a mathematical theory on period-increasing as an indicator of stability loss in a dynamical system of any dimension not less than two, and show that in two-dimensional autonomous ODEs, the period-increasing is closely associated with homoclinic or heteroclinic bifurcation. Then we demonstrate that the proposed period-increasing regime shift can occur in some ecological models.
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Moss, Ellen, Chantal Cyr, Jean-François Bureau, George M. Tarabulsy, and Karine Dubois-Comtois. "Stability of Attachment During the Preschool Period." Developmental Psychology 41, no. 5 (2005): 773–83. http://dx.doi.org/10.1037/0012-1649.41.5.773.

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Draut, Amy E., Maureen E. Raymo, Jerry F. McManus, and Delia W. Oppo. "Climate stability during the Pliocene warm period." Paleoceanography 18, no. 4 (October 7, 2003): n/a. http://dx.doi.org/10.1029/2003pa000889.

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Guttalu, Ramesh S., and Henryk Flashner. "Stability study of a periodic system by a period-to-period mapping." Applied Mathematics and Computation 78, no. 2-3 (September 1996): 123–35. http://dx.doi.org/10.1016/0096-3003(96)00003-3.

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Svatošová, Irena, and Lenka Michnová. "Thermal Stability of the Summer Period in Schoolrooms." Advanced Materials Research 899 (February 2014): 346–51. http://dx.doi.org/10.4028/www.scientific.net/amr.899.346.

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Schoolrooms in school facilities are the most problematic in maintenance of the internal microclimate and that is why, they have strict hygiene requirements. The generated pollutants in this space are not only affected by the presence of people but especially by solar radiation and orientation of doors and windows to the cardinal points. Considerable importance have the size of the windows, because the room must meet the standards criteria for minimum daily requirement of iluminance Dmin. Increasing outdoor temperature, solar radiation and stay of persons in the classrooms are important aspects that irreversibly lead to deterioration of the microclimatic conditions in these areas. This leads to premature fatigue, loss of concentration, which may lead to headaches, for example. This paper aims to determine the impact of available instruments commonly used in practice to reduce the thermal load of sunlight in the classrooms and determine the actual effectiveness of individual instruments in the real environment.
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Kongas, O. "Stability and torsion in the period doubling cascade." Physics Letters A 241, no. 3 (April 1998): 163–67. http://dx.doi.org/10.1016/s0375-9601(98)00102-9.

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Xu, Dapeng, A. P. Litvinchuk, X. Wang, A. Delaney, H. Le, and S. S. Pei. "Structure stability of short-period InAs/AlSb superlattices." Journal of Crystal Growth 251, no. 1-4 (April 2003): 547–50. http://dx.doi.org/10.1016/s0022-0248(02)02395-3.

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Trojáková, L., Z. Réblová, and Z. Pokorný. "Determination of oxidative stability in mixtures of edible oil with nonlipidic substances." Czech Journal of Food Sciences 19, No. 1 (February 7, 2013): 19–23. http://dx.doi.org/10.17221/6569-cjfs.

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The storage of lipid foods is mostly affected by the oxidation of lipid fraction. Dry foods are particularly sensitive because lipids are not protected by hydrated proteins against oxidation. A method suitable for testing dry foods was studied in model mixtures of rapeseed oil with albumin or cellulose. Oxipres apparatus was used, where the course of oxidation is monitored by changes of oxygen pressure. The end of induction period was more evident than in bulk oils as the contact of lipids with oxygen is better. The induction period was longer in mixtures of edible oil with albumin than in mixtures with cellulose. The induction period moderately decreased with increasing oxygen pressure, while the effect of sample weight was nearly negligible. The induction period length was a semilogarithmic function of reaction temperature. Variation coefficients and differences between the duplicates showed good reproducibility; they were lower in mixtures with albumin than in mixtures with cellulose, but both were of the same order as the respective values in bulk oils. At 120°C and 0.5 MPa oxygen, the induction periods could be usually measured within a working day.
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Kiseleva, L., J. Anosova, P. Eggleton, J. Colin, and V. Orlov. "Stability and Instability of Hierarchical Triple Systems." Symposium - International Astronomical Union 164 (1995): 370. http://dx.doi.org/10.1017/s0074180900108897.

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We computed the dynamical evolution of hierarchical triple stars in which both orbits are initially circular, and determine the lower limit to the ratio of periods (outer/inner) for which there is dynamical stability. We found for some mass ratios resonance-like behaviour that occurs in a limited range of initial period ratio. Some resonances are ‘disruptive’; that is, for a small range of initial period ratio we find that the system is not able to settle down to a quasi-steady hierarchical state, but instead disrupts. However, below as well as above this disruptive range there are considerable ranges of initial period ratio where the hierarchical state appears to be stable, at least for the length of integration time we took which was sometimes as much as 10,000 outer orbits. The mass ratios are identified for which different types of unstable behaviour, such as an escape of the distant body without exchange, many exchanges in the limited space without escape, formation of new long-live hierarchy, or an escape of one body after a few exchanges, occur for ratios of periods slightly below the limit of stability. We discuss the relevance of the above behaviour to observed close triples, the closest of which is λ Tau (period ratio 8.3).
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Nafea Al-Zararee, Abdul, and Atif Batarseh. "The impact of external factors on the monetary stability in Jordan for the period 1990–2015." Banks and Bank Systems 14, no. 1 (February 5, 2019): 29–41. http://dx.doi.org/10.21511/bbs.14(1).2019.04.

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This study aimed to examine the impact of external factors (external grants and aid, external public debt, remittances of Jordanians labor abroad and external shocks) on the efficiency of the monetary policy, which aims at achieving monetary stability through influencing inflation rates in Jordan during the period 1990–2015, by using standard regression equation estimated by the ordinary least squares (OLS). The findings of the study showed a statistically significant impact at 1% of each of the external grants and aid, and remittances of Jordanians labor abroad on the efficiency of monetary policy through targeting inflation rates in Jordan. As to the variables of external public debt and external shocks, the findings showed a weak impact, which was not statistically significant at a reasonable level, on the efficiency of monetary policy. The researchers recommended that decision-makers pay further attention to the vital role of the remittances of the Jordanians labor abroad, which is one of the main bases of the Jordanian economy. This is due to its crucial impact on the Jordanian economy.
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Dissertations / Theses on the topic "Period of stability"

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Koskinen, T. T. "The stability of short-period extrasolar giant planets." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1444248/.

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A three-dimensional coupled thermosphere-ionosphere model for extrasolar giant planets (EXOTIM) has been developed. This is the first such model reported in the literature. This thesis contains an extensive description of the model and the methods adopted in modelling the different physical processes expected in the upper atmospheres and ionospheres of extrasolar giant planets. Modelling the upper atmosphere is important because the stability of the atmosphere against thermal evaporation is controlled by the conditions in the thermosphere. The thermosphere is heated by the absorption of EUV and X ray (XUV) radiation emitted by the host star. The radiation also ionises the neutral species in the upper atmosphere, which is expected to be composed mainly of molecular and atomic hydrogen, and atomic helium. Ionisation and subsequent photochemistry leads to the formation of the H+, Hf, H3", and He+ ions (and small quantities of HeH+). H3" emits strongly in the infrared and may act as a significant coolant in gas giant thermospheres. Assuming photochemical equilibrium, the absorption of XUV radiation and ion photochemistry were modelled in a self-consistent fashion. The 3D model can also simulate strong winds affecting the upper atmosphere, and account for both advection and diffusion of the neutral species around the planet. The results indicate that within 1.0 AU from a solar-type host star, the upper atmospheres of Jupiter-type EGPs can be substantially cooler and more stable than implied by studies that ignore the possibility of radiative (Hf) cooling. In this context, a limiting distance, or a stability limit, was identified for such EGPs that depends on the composition of the upper atmosphere and ionosphere, and within which the atmospheres of the planets undergo hydrodynamic escape. Under restricted conditions, this limit is located around 0.15 AU from a Sun-like host star. The model was also used to simulate a newly found transiting planet HD17156b, which orbits its host star on a highly eccentric orbit.
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Němečková, Lenka. "Hodnocení stability vybraných rostlinných olejů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-216588.

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This diploma thesis is focused on issues concerning the stability of selected vegetable oils which are used in cosmetic industry. The stability of eight oils without additives were determined by a differential scanning calorimeter. In the first phase, the temperatures of oil degradation were determined for different rates of heating, i.e. nonisothermal stabilities. They were consequetly used to calculate isothermal stabilities alias induction periods. The calculation of induction periods was completed by using integral isoconversional methods, which applied four different temperature functions. One of the temperature functions corresponded to Arrhenius equation while the others to non-Arrhenius functions. The confrontation of induction periods under standart conditions showed that an optimal temperature function to calculate oil stabilities is one of the non-Arrhenius functions in exponential form. We can state that all oils are degraded by similar, if not the same, mechanism. The specified stabilities, in periods of months, have proved the importance of using stabilizers and other additives in the commercial and technological use of vegetable oils.
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Viman, Olof. "Stability and Change in Personality in Adult Women Over a 37-Year Period." Thesis, Örebro universitet, Institutionen för juridik, psykologi och socialt arbete, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-23889.

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AbstractThe present study aims to examine mean-level, rank-order, and individual-level change in personality in two population-based samples of women. Participants were followed over 37 years from mid-life to old age, including two cohorts aged 38 to 75 years and 46 to 83 years. Participants completed the Cesarec-Marke Personality Schedule – a self-report measure of Murray’s psychogenic needs – in 1968 and 2005. Mean levels of need for affiliation, order, nurturance, and succorance increased whereas need for dominance, aggression, and defense of status decreased, but effect sizes were generally small and test-retest correlations were generally strong, suggesting personality stability. By contrast, significant changes were observed at the individual level, with participants both increasing and decreasing in most psychogenic needs. Eighty five percent (85%) of the participants changed significantly in at least one psychogenic need.
SammanfattningDenna studie undersöker medelvärdes-, rangordnings- och individuell förädring av personlighet i två urval av kvinnor. Deltagarna följdes över 37 år; den ena kohorten från 38 år till 75 år och den andra från 46 år till 83 år. Deltagarna besvarade Cesarec-Marke personlighetsformulär – ett självskattningsmått av personlighet utifrån Murrays psykogena behov – 1968 och 2005. Medelvärdet ökade för behov av tillhörighet, att ha ordning, att bli omhändertagen samt att ta hand om andra. Medelvärdet minskade för behov av att leda/dominera, att hämnas/retas samt känslighet för andras åsikter/att undvika misstag. Effektstyrkan var generellt liten, och korrelationskoefficienterna mellan baslinje och uppföljning var generellt höga vilket tyder på personlighetsstabilitet. Å andra sidan sågs signifikanta förändringar på individnivå, med deltagare som både ökade och minskade signifikant på de flesta psykogena behov. Åttiofem procent (85%) av deltagarna förändrades signifikant på minst ett psykogent behov.
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Liu, Jingjing. "Identification and Regulatory Role of E3 Ligases in the Time-Dependent Degradation of the Circadian Factor Period 2." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/81179.

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Circadian rhythms are self-sustained, 24h, biological oscillatory processes that are present in organisms ranging from bacteria to human. Circadian rhythms, which can be synchronized by external cues, are important for organisms to adjust their behavior, physiological activity, and metabolic reactions to changes in environmental conditions. Another well-established oscillatory mechanism that shares common organizational and regulatory features with the circadian system, is the cell division cycle. Recent findings reveal that some essential regulators are common to both the cell cycle and the circadian clock. The first half of my thesis (Chapter 2-3) focuses on the function of Period 2 (Per2), a key regulatory component of the negative feedback arm of the clock and tumor suppressor protein, as a modulator of cell cycle response. We found that Per2 binds the C-terminus end of the tumor suppressor p53 thus forming a trimeric complex with p53's negative regulator Mdm2 and preventing Mdm2-mediated p53's ubiquitination and degradation. Thus, Per2 stabilizes p53 under unstressed conditions allowing for basal levels of the protein to exist and be available for a rapid response to take place in case of any stressed signals. Our experiments prove that Per2 plays an indispensible role in p53 signaling pathway. The second half of my thesis (Chapter 4-5) focuses on how Mdm2 and Per2 interplay regulate Per2 availability and its impact on circadian clock function. My research found that Mdm2 targets Per2 for ubiquitination as Mdm2 depletion stabilizes Per2 and, conversely, Mdm2 ectopic expression shorten Per2's half-life. Accordingly, association of Per2 to Mdm2 maps C-terminus of the p53 binding region in Mdm2 and thus, the RING domain remains accessible. Next, we tested the hypothesis that Mdm2-dependent ubiquitination of Per2 directly impacts circadian clock period length. Accordingly, addition of sempervirine nitrate (SN), a specific molecular inhibitor of Mdm2, to MEF cells abrogated Per2 ubiquitination leading to the accumulation of a stable pool of Per2. By recording the oscillatory behavior of the Per2:Luc reporter system in MEF cells treated with SN at different circadian times, we found that inhibition of Mdm2 E3 ligase activity promoted phase advance only when treatment took place during the degradation period. This is in agreement with our findings that radiation, but not light pulses, causes the same phase behavior. Considering the established role of both Mdm2 and p53 in the response of cells to genotoxic stress and Per2 in modulating the clock, the existence of the Mdm2-Per2-p53 complex opens the possibility of various stimuli triggering regulatory mechanisms converging in a critical node. Overall, our work provides a holistic view of how signals are integrated at multiple levels to ensure that environmental signals are sense and responses triggered timely.
Ph. D.
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Herö, Johan. "The effects on knee angular velocity after a 6-weeks training period with the new training device ProPrioPlate- a pilot study." Thesis, Högskolan i Halmstad, Biomekanik och biomedicin, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25040.

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AbstractBackground: ACL injuries is common and can result in long term disability or even have a career ending outcome for the athlete. Women are more exposed to ACL injuries than men are and several factors increase the risk of ACL injuries for women where one is the knee angle velocity. It seems that prevention programs involving plyometric- and strength training has been most effective on altering these risk factors for knee injuries. But many programs involve several exercises which makes it very time consuming. Since the gluteus muscles is our main hip abductor and hip stabilizer it is of great importance for controlling the knee. The ProPrioPlate (PPP) is a device that has been validated and shown to activate the gluteus medius 40% more in a squat compared to a regular bodyweight squat.Purpose: To investigate if a 6 week long training period, 3 sessions/ week, 5minutes/session with the PPP could decrease the mean abduction angular velocity (°/sec) of the knee joint in a Drop jump (DJ) in women with poor knee stabilityMethod: An experimental study design was used. Twelve female athletes with poor knee stability and signs of knee valgus in a drop jump conducted a 6 weeks training program to investigate any changes in abduction angular velocity in a DJ. 3D motion analyzes were performed before and after the training period. Wilcoxon signed ranked test was used to investigate if there were any changes in results between the different test occasions.Results: Median abduction angular velocity of the test performed before the intervention was -34. 34 (min -70. 65 max -11. 53) deg/sec and after the intervention median -34. 22 deg/sec (min -51. 97 max -3. 28). The P value was 0.24 which indicate that there were no statistical significant differences between the three testing occasions. Compliance to the intervention was low, 15%.Conclusion: A 6 weeks training period with the PPP did not decrease the abduction angular velocity. Due to low compliance rate amongst of subjects no conclusion regarding the effect of the device can be made.
Abstrakt:Bakgrund: Svenska ligament registret rapporterar ungefär 5000 främre korsbandsskador (ACL) årligen i Sverige. ACL skador kan resultera i långvarig frånvaro från sporten eller till och med att idrottaren inte längre kan fortsätta sin karriär. Kvinnor är mer utsatta för ACL skador än män och det är flera faktorer som ökar risken för ACL skador hos kvinnor. Forskningen pekar mot att träningsprogram som syftar till att minska risken för knäskador innefattar styrketräning och plyometrisk träning. Många träningsprogram för att minska risken för knäskador innefattar många övningar vilket gör det tidskrävande. ProPrioPlate (PPP) är ett träningsredskap som är validerat och har visats aktivera gluteus medius 40% mer i en knäböj på PPP jämfört med vanliga knäböj.Syftet med denna studie var att undersöka knätabduktionshastighet i ett dropp vertikalhopp innan och efter ett 6 veckors träningsprogram med PPP för kvinnor med bristande knästabilitet.Metod: En exprementell studiedesign har använts. Tjugo frivilliga kvinnliga idrottar med bristande knästabilitet och teckan på valgus vid dropjump genomförde ett 6 veckors träningsprogram för att undersöka om knäabduktionshastighet i ett dropp vertikalhopp förändrades efter träningsperioden. 3D analyser på testpersonerna genomfördes innan och efter träningsperioden. Wilcoxons signed ranked test användes för att undersöka skillnader mellan de olika test tillfällena.Resultat: Medianen av abduktionshastigheten före interventionen var -47,88 grader/sek (min -74,76 max -30.16), -34.34 (min -70.65 max -11.53) och efter interventionen -34.22 (min -51.97 max -3.28) grader/sek. P värdet var 0.24 vilket indikerar att det inte fanns någon signifikant skillnad mellan före- och eftertesterna. Följsamheten till träningen hos deltagarna var låg (15%).Slutsats: En 6 veckors träningsperiod med PPP minskade inte abduktionshastigheten i ett DJ. Låg åtföljnad av våra testpersoner till träningsperioden innebar att inga slutsatser gällande PPP kan utgöras.
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Cronje, Frans Johannes Cornelius. "Beyond the high road : a scenario analysis of the prospects for political stability or instability in South Africa over the period to 2024 / Frans Johannes Cornelius Cronje." Thesis, North-West University, 2013. http://hdl.handle.net/10394/9687.

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Despite the widely hailed success of South Africa’s transition from apartheid to democracy it was apparent by the mid-2000s that beneath the veneer of stability lay a country facing serious social and economic challenges. The employment and labour market participation rates were uniquely low among emerging markets. Protest action against the state had reached levels last encountered in the volatile 1980s and early 1990s. The budget and current account deficits had reached unsustainable levels. By its own admission the government realised that the country was not recording GDP growth rates necessary to make dramatic inroads into poverty, unemployment and inequality levels. A number of analysts and commentators therefore came to question the future stability of South Africa’s political system. Trade unions and some Cabinet ministers routinely described unemployment as a “ticking time bomb”. The Chairman of the Institute of International Affairs wrote in Business Day that he could predict when South Africa’s “Tunisia Day” would arrive. The respected Economist newspaper ran a front page feature on what it called South Africa’s “downhill slide”. Former President FW de Klerk warned that South Africa was approaching a precipice. Clem Sunter, South Africa’s most renowned scenario planner, upped his prospects that South Africa may become a failed state. Global ratings agencies downgraded South Africa citing the fear that government policy could not meet popular demands. Amidst such speculation it is vitally important that the prospects for instability be investigated and determined, not via opinion or speculation, but rather against a sound body of theory. This task is complicated by the fact that the feared instability may only occur at a point in the future. The theory must therefore be applied via a methodology capable of overcoming the weak track record of political science in accurately anticipating major shifts in political systems. This problem statement will be addressed by showing that complex systems theory holds the key to a series of units of analysis via which the stability or instability of any political system can be objectively determined, compared to any other political system, and tracked over time. Secondly that there are scenario planning methodologies that can overcome the uncertainty inherent in the futures of all complex systems and thereby the poor track record that political scientists have in anticipating dramatic future changes in the systems they study. When combined into a single complex systems/scenario model, these theoretical and methodological points of departure will allow the long term prospects for stability or instability of any political system to be accurately and objectively determined.
PhD (Development and Management) North-West University, Potchefstroom Campus, 2013
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Foster, Tyler Michael. "Dynamic Stability and Handling Qualities of Small Unmanned-Aerial-Vehicles UNMANNED-AERIAL-VEHICLES." BYU ScholarsArchive, 2004. https://scholarsarchive.byu.edu/etd/219.

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General aircraft dynamic stability theory was used to predict the natural frequencies, damping ratios and time constants of the dynamic modes for three specific small UAVs with wingspans on the scale from 0.6 meters to 1.2 meters. Using USAF DatCom methods, a spreadsheet program for predicting the dynamic stability and handling qualities of small UAVs was created for use in the design stage of new small UAV concept development. This program was verified by inputting data for a Cessna-182, and by then comparing the program output with that of a similar program developed by DAR Corporation. Predictions with acceptable errors were made for all of the dynamic modes except for the spiral mode. The design tool was also used to verify and develop dynamic stability and handling qualities design guidelines for small UAV designers. Using this design tool, it was observed that small UAVs tend to exhibit higher natural frequencies of oscillation for all of the dynamic modes. Comparing the program outputs with military handling qualities specifications, the small UAVs at standard configurations fell outside the range of acceptable handling qualities for short-period mode natural frequency, even though multiple test pilots rated the flying qualities as acceptable. Using dynamic scaling methods to adjust the current military standards for the short period mode, a new scale was proposed specifically for small UAVs. This scale was verified by conducting flight tests of three small UAVs at various configurations until poor handling qualities were observed. These transitions were observed to occur at approximately the boundary predicted by the new, adjusted scale.
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Nhandara, Simbarashe. "The Operational Code of Tony Blair : Did he experience Learning, Stability or Change in his Belief System during the period he was Prime Minister?" Thesis, Södertörns högskola, Institutionen för samhällsvetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-30510.

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The intention of this project is to examine whether or not; Anthony Charles Lynton "Tony" Blair, experienced any belief changes or learning, during the period he was Prime Minister of the United Kingdom (UK), a period which lasted 10 years commencing 1997 until 2007. Our analysis will cover a timeline beginning from 1999 a point in time when the UK participated in NATO’s Operation Allied Force during the Kosovo War until 2006 when Britain took on the reins of the EU presidency for a six-month period. An exploration, of the beliefs behind a leader’s decision making logic, should always be considered a prudent undertaking especially when it comes to foreign policy studies. This is because, it is only through such activity scholars can comprehend the distinction between decisions and actions. Thus, understanding when and how; an individual leaders’ belief system changes, is of central importance in furthering our ability in explaining not only state behaviour, but, also the relationship between ‘self’ and ‘other’. The main purpose of an operational code analysis is to enable political scientists and policy makers alike, to deduce from a particular leader’s verbal content, what that actor's beliefs are and the premises they take in relation to their decision-making process. The first of our two part hypotheses seeks to determine whether Tony Blair exhibited changes in his beliefs at various stages of his premiership. These stages were signified by events which were also crucial in defining his political legacy. The events are divided into three categories, Post Kosovo – Pre Iraq, Pre 9/11 – Post 9/11 and Pre EU – Post EU. On completion of our VICS and SPSS analysis on Tony Blair’s operational code belief we discovered that there were no statistically significant changes in any of his operational indices. So, due to the lack of statistically significant changes in Blair’s Philosophical and Instrumental indices we could not classify the events selected for this analysis as having produced any influence on his belief system. Thus we rejected our null hypothesis and accept the alternative hypothesis.
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Puntriano, Rosas César Alfredo. "Legal Consequences Derived from the Violation of Exit Labor Stability by the Employer." Derecho & Sociedad, 2017. http://repositorio.pucp.edu.pe/index/handle/123456789/118330.

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After a conceptual overview of the scope of the right to job stability, its relationship with other rights (right to work, right to access to employment, right to maintain employment) and its constitutional, international and legal regulation and the position of jurisprudence, the author goes on to discuss the complex picture presented to the employer before a decision to dismiss both from a legal perspective (compensation, replacement) and case law (damages, replacement) adding a paragraph called “others” the recount administrative consequences arising from said measure both labor (SUNAFIL) and tax (SUNAT) viewpoint.
Luego de un breve repaso conceptual de los alcances del derecho a la estabilidad laboral, su relación con otros derechos (derecho al trabajo, derecho de acceso al empleo, derecho a conservar el empleo) y su regulación constitucional, internacional y legal, así como la posición de la jurisprudencia, el autor pasa a comentar el complejo panorama que se presenta al empleador ante una decisión de despido tanto desde la óptica legal (indemnización, reposición) como jurisprudencial (indemnización por daños, reposición) añadiéndose un acápite denominado “otros” para las relatar las consecuencias administrativas que surgen de la indicada medida tanto desde la óptica laboral (SUNAFIL) como tributaria (SUNAT).
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Eidėjienė, Audra. "Stuburo stabilizavimo pratimų efektyvumas pooperaciniu tarpslankstelinių diskų išvaržų laikotarpiu." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060509_125704-61768.

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Object: postoperative treatment of herniated intervertebral disc with stability exercises. Problem: degeneration of the intervertebral disc from a combination of factors can result in herniation. Disk herniation is the protrusion of the gelatinous material of the disk (nucleus pulposus) through the annulus fibrosus (Fardon & Milette, 2001). The presence of pain, radiculopathy and other symptoms depends on the site and degree of herniation. Many treatment modalities have been suggested for lumbar disc herniation, but studies often provide conflicting results (Humphreys & Eck, 1999). Postoperative treatment is very important. Doctor B.Spakauskas with co-authors (2002) says that after operative treatment condition of patient is getting worse. Hypothesis: back stability exercises applied in postoperative herniated disc period using stabilizer should improve endurance of lumbar spine muscles more than applying traditional exercises. The aim of this study was to evaluate effectiveness of back stability exercises in postoperative herniated intervertebral disc period. The tasks: to evaluate static endurance of trunk muscles, strength of hip, calf and foot muscles and low back pain before and after applying back stability exercises; to evaluate static endurance of trunk muscles, strength of hip, calf and foot muscles and low back pain before and after applying traditional (stretching, strengthening) exercise program; to determine which exercise program had better effect on... [to full text]
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Books on the topic "Period of stability"

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Khorrami, M. R. Stability of streamwise vortices: Progress report for the period ended April 1, 1986. Norfolk, Va: Old Dominion University Research Foundation, 1987.

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Presidency, Mexico. Pact for stability and economic growth: Agreement for the period January-July 1989. Mexico: Presidency of the Republic, 1988.

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Buti, Marco. Budgetary policies during recessions: Retrospective application of the "Stability and Growth Pact" to the post-war period. Brussels: Directorate-General for Economic and Financial Affairs, Commission of the European Communities, 1997.

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DuPlessis, Robert S. Lille and the Dutch revolt: Urban stability in an era of revolution, 1500-1582. Cambridge [England]: Cambridge University Press, 1991.

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Rosenberger, F. Morphological stability and fluid dynamics of vapor crystal growth: Semiannual progress report : period: 6-1-84 to 11-30-84. Salt Lake City, UT: Dept. of Physics, University of Utah, 1985.

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Rosenberger, F. Morphological stability and kinetics in crystal growth from vapors: Final report, period of performance January 20, 1989 - July 19, 1990. Huntsville, Ala: Center for Microgravity and Materials Research, University of Alabama in Huntsville, 1990.

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Schmidt, D. K. Cooperative control theory and integrated flight and propulsion control: Final technical report for grant NAG3-575 covering the period 1994-1995. College Park, Md: Dept. of Aerospace Engineering, University of Maryland, 1995.

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Capodaglio, Gianfranco. I costi di commessa in condizioni di stabilità ed in periodi di fluttuazione monetaria. Bologna: CLUEB, 1992.

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United States. Congress. Commission on Security and Cooperation in Europe. Implementation of the Helsinki accords: Joint hearing before the Commission on Security and Cooperation in Europe and the Subcommittee on Africa of the Committee on Foreign Affairs, One Hundred Second Congress, first session : Conference on Security, Stability, Development, and Cooperation in Africa, July 30, 1991. Washington: U.S. G.P.O., 1992.

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United States. Congress. Commission on Security and Cooperation in Europe. Implementation of the Helsinki accords: Hearing before the Commission on Security and Cooperation in Europe, Ninety-ninth Congress, first session, human rights abuses in Cyprus, July 20, 1985, New York, New York. Washington: U.S. G.P.O., 1986.

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Book chapters on the topic "Period of stability"

1

Broddin, D., G. Tendeloo, and S. Amelinckx. "Long Period Superstructures in Cu3+xPd." In Alloy Phase Stability, 113–17. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0915-1_9.

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Graef, M., and D. Broddin. "Long Period Superlattice Phases in Cu-Al-Zn Alloys." In Alloy Phase Stability, 119–23. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0915-1_10.

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Kepler, S. O., J. E. S. Costa, D. E. Winget, R. E. Nather, Anjum Mukadam, A. Nitta-Kleinman, and M. S. O’Brien. "Period Stability on Pulsating White Dwarfs." In White Dwarfs, 239–41. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0215-8_72.

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Selke, Walter. "Long Period Structures in Alloys-Statistical Mechanics of the Annni Model and Related Concepts." In Alloy Phase Stability, 205–32. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0915-1_16.

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Loiseau, A., J. Planes, and F. Ducastelle. "Quantitative statistical description of the long period antiphase boundary structures from their high resolution image." In Alloy Phase Stability, 101–6. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0915-1_7.

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Naimzada, Ahmad, and Marina Pireddu. "Eductive Stability, Heterogeneous Information Costs and Period-Two Cycle Multiplicity." In Games and Dynamics in Economics, 125–41. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3623-6_7.

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Silvotti, R., and R. Kalytis. "Pulsation Period Stability in the SDBV Star HS 2201+2610." In White Dwarfs, 77–80. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0215-8_20.

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Neishtadt, A. I., V. V. Sidorenko, and C. Simó. "Stability of Long-Period Planar Satellite Motions in a Circular Orbit." In Dynamics of Natural and Artificial Celestial Bodies, 227–33. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-1327-6_29.

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Mohanty, Manas Kumar, and Parag Kumar Guha Thakurta. "Improving Network Stability Period for Precision Agriculture: An Energy-Aware Routing Approach." In Proceedings of International Conference on Advanced Computing Applications, 177–87. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5207-3_16.

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Amano, Hiroki, Hiroyuki Asahara, and Takuji Kousaka. "A Stability Analysis Method for Period-1 Solution in Two-Mass Impact Oscillator." In Nonlinear Dynamics of Electronic Systems, 37–44. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08672-9_6.

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Conference papers on the topic "Period of stability"

1

Khalil, Enan A., and Suat Ozdemir. "Prolonging stability period of CDS based WSNs." In 2015 International Wireless Communications and Mobile Computing Conference (IWCMC). IEEE, 2015. http://dx.doi.org/10.1109/iwcmc.2015.7289181.

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Su, Xiaocheng. "Stability Analysis of Xujiazhuang Dam during Construction Period." In 2017 2nd International Conference on Education, Sports, Arts and Management Engineering (ICESAME 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icesame-17.2017.353.

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Zhang, Yu, and Ze-Zhu Ren. "Global stability of the SEIR epidemic model with infectivityin both latent period and infected period." In 2013 7th International Conference on Systems Biology (ISB). IEEE, 2013. http://dx.doi.org/10.1109/isb.2013.6623790.

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Luo, Albert C. J., and Yaoguang Yuan. "Period Motions and Stability in a Nonlinear Spring Pendulum." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86862.

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In this paper, period-1 motions varying with excitation frequency in a periodically forced, nonlinear spring pendulum system are predicted by a semi-analytic method. The harmonic frequency-amplitude for periodical motions are analyzed from the finite discrete Fourier series. The stability of the periodical solutions are shown on the bifurcation trees as well. From the analytical prediction, numerical illustrations of periodic motions are given, the comparison of numerical solution and analytical solution are given.
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Luo, Albert C. J. "Stability and Bifurcation for the Equispaced, Periodic Motion of a Horizontal Impact Damper." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21505.

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Abstract Stability and bifurcation conditions for the asymmetric, periodic motion of a horizontal impact damper under a periodic excitation are developed through four mappings for two switch-planes relative to discontinuities. Period-doubling bifurcation for equispaced motion does not occur, but the asymmetric period-1 motions change to the asymmetric, period-2 ones through a period doubling bifurcation. A numerical prediction for equispaced to chaotic motions is completed. The numerical and analytical predictions of the periodic motion are in very good agreement. The asymmetric, periodic motions are also simulated.
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Wang, Fengxia, and Albert C. J. Luo. "Parametric Stability of a Nonlinear Rotating Blade." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62141.

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The stability of period-1 motions of a rotating blade with geometric nonlinearity is studied. The roles of cubic stiffening geometric term are considered in the study of nonlinear periodic motions and its stability and bifurcations of a rotating blade. The nonlinear model of a rotating blade is reduced to the ordinary differential equations through the Galerkin method, and the gyroscopic systems with parametric excitations are obtained. The generalized harmonic balance method is employed to determine the period-1 solutions and the corresponding stability and bifurcations.
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Luo, Albert C. J., and Siyu Guo. "Period-1 and Period-2 Motions in a Brusselator With a Harmonic Diffusion." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70782.

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In this paper, the analytical solutions of periodic evolution of Brusselator are investigated through the general harmonic balanced method. Both stable and unstable, period-1 and period-2 solutions of the Brussellator are presented. Stability and bifurcations of the periodic evolution are determined by the eigenvalue analysis. Numerical simulations of stable period-1 and period-2 motions of Brusselator are completed. The harmonic amplitude spectrums show harmonic effects on periodic motions, and the corresponding accuracy of approximate analytical solutions can be prescribed specifically.
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Kumari, Ch Usha. "Investigation: Life-Time and Stability Period in Wireless Sensor Network." In 2018 3rd International Conference for Convergence in Technology (I2CT). IEEE, 2018. http://dx.doi.org/10.1109/i2ct.2018.8529814.

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Li, Yao, Cesar Augusto Vargas-Garcia, and Abhyudai Singh. "Stochastic stability of a cell cycle model with "silence period"." In 2020 European Control Conference (ECC). IEEE, 2020. http://dx.doi.org/10.23919/ecc51009.2020.9143745.

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Guo, Siyu, and Albert C. J. Luo. "Period-1 to Period-2 Motions in a Discontinuous Oscillator." In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22712.

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Abstract In this paper, grazing bifurcations on bifurcation trees in a discontinuous dynamical oscillator are discussed. Once the grazing bifurcation occurs, periodic motions switches from the old motion to a new one. Thus, grazing bifurcations on a bifurcation tree of period-1 to period-2 motions varying spring stiffness are presented in a discontinuous oscillator with three domains divided by circular boundaries. The stability and bifurcations of period-1 and period-2 motions are discussed. From analytical predictions, periodic motions are simulated numerically. Stiffness effects on the periodic motions are discussed. Such studies will help one understand parameter effects in discontinuous dynamical systems, which can be applied for system design and control.
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Reports on the topic "Period of stability"

1

Lynch, J. The stability of alkalinity, calcium, magnesium, and pH in lake water samples stored over a period of years. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/203763.

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Stern, David, and Gadi Schuster. Manipulating Chloroplast Gene Expression: A Genetic and Mechanistic Analysis of Processes that Control RNA Stability. United States Department of Agriculture, June 2004. http://dx.doi.org/10.32747/2004.7586541.bard.

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New potential for engineering chloroplasts to express novel traits has stimulated research into relevant techniques and genetic processes, including plastid transformation and gene regulation. This BARD-funded research dealt with the mechanisms that influence chloroplast RNA accumulation, and thus gene expression. Previous work on cpRNA catabolism has elucidated a pathway initiated by endonucleolytic cleavage, followed by polyadenylation and exonucleolytic degradation. A major player in this process is the nucleus-encoded exoribo-nuclease/polymerase polynucleotide phosphorylase (PNPase). Biochemical characterization of PNPase has revealed a modular structure that controls its RNA synthesis and degradation activities, which in turn are responsive to the phosphate (P) concentration. During the funding period, new insights emerged into the molecular mechanism of RNA metabolism in the chloroplast and cyanobacteria, suggesting strategies for improving agriculturally-important plants or plants with novel introduced traits.
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La Haye, Robert. National Spherical Torus Experiment Upgrade Collaborative Research on Configuration Optimization of Advanced Operating Scenarios and Control Including Macroscopy Stability EOG for Period 3/1/14 through 2/28/18. Office of Scientific and Technical Information (OSTI), March 2018. http://dx.doi.org/10.2172/1439061.

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Moldovan, Paula, Sérgio Lagoa, and Diana Mendes. The impact of Economic Policy Uncertainty on the real exchange rate: Evidence from the UK. DINÂMIA'CET-Iscte, 2021. http://dx.doi.org/10.15847/dinamiacet-iul.wp.2021.06.

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The world economy has been punctuated by uncertainty as a result of the 2008 subprime crisis, the European sovereign debt crisis, Brexit, and the 2016 US presidential elections, to mention but a few of the reasons. This study explores how the UK real exchange rate reacts to economic policy uncertainty (EPU) shocks using monthly data for the period 1998 to 2020. We contribute to the literature by identifying the long-run and short-run impacts of EPU using a cointegrated ARDL model, and by studying a country that has been through periods of both relatively low and high uncertainty. Results confirm that EPU has an important effect in the long run by depreciating the exchange rate. In addition to urging policymakers and regulators to concentrate on the sometimes difficult task of keeping policy uncertainty to a minimum as a way of sustaining exchange rate stability and thus promoting long-term economic growth, further evidence is provided on exchange rate fundamentals.
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Bielinskyi, Andrii, Vladimir Soloviev, Serhiy Semerikov, and Viktoria Solovieva. Detecting Stock Crashes Using Levy Distribution. [б. в.], August 2019. http://dx.doi.org/10.31812/123456789/3210.

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In this paper we study the possibility of construction indicators-precursors relying on one of the most power-law tailed distributions – Levy’s stable distribution. Here, we apply Levy’s parameters for 29 stock indices for the period from 1 March 2000 to 28 March 2019 daily values and show their effectiveness as indicators of crisis states on the example of Dow Jones Industrial Average index for the period from 2 January 1920 to 2019. In spite of popularity of the Gaussian distribution in financial modeling, we demonstrated that Levy’s stable distribution is more suitable due to its theoretical reasons and analysis results. And finally, we conclude that stability α and skewness β parameters of Levy’s stable distribution which demonstrate characteristic behavior for crash and critical states, can serve as an indicator-precursors of unstable states.
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Wezeman, Pieter, and Alexandra Kuimova. Military Spending and Arms Imports by Iran, Saudi Arabia, Qatar and the UAE. Stockholm International Peace Research Institute, May 2019. http://dx.doi.org/10.55163/zapt6109.

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Tense relations between Iran, Qatar, Saudi Arabia and the United Arab Emirates (UAE) are a major cause for concern regarding stability, security and peace in the Gulf region and in the Middle East more generally. These states seek to play a major role in the Middle East and use arms as a key tool in the pursuit of this aim. To illustrate the importance given to military capability in these four states, this fact sheet provides a concise overview of trends and patterns of military expenditure and of arms imports—the main source of modern major arms for these states—in the period 1994–2018.
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Corum, Zachary, Ethan Cheng, Stanford Gibson, and Travis Dahl. Optimization of reach-scale gravel nourishment on the Green River below Howard Hanson Dam, King County, Washington. Engineer Research and Development Center (U.S.), April 2022. http://dx.doi.org/10.21079/11681/43887.

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The US Army Corps of Engineers, Seattle District, nourishes gravel downstream of Howard Hanson Dam (HHD) on the Green River in Washington State. The study team developed numerical models to support the ongoing salmonid habitat improvement mission downstream of HHD. Recent advancements in computing and numerical modeling software make long-term simulations in steep, gravel, cobble, and boulder river environments cost effective. The team calibrated mobile-bed, sediment-transport models for the pre-dam and post-dam periods. The modeling explored geomorphic responses to flow and sediment regime changes associated with HHD construction and operation. The team found that pre-dam conditions were significantly more dynamic than post-dam conditions and may have had lower spawning habitat quality in the project vicinity. The team applied the Bank Stability and Toe Erosion Model to the site and then calibrated to the post-dam gravel augmentation period. The team implemented a new hiding routine in HEC-RAS that improved the simulated grain size trends but underestimated coarse sediment transport. Models without the hiding function overestimated grain size but matched bed elevations and mass flux very well. Decade-long simulations of four future gravel nourishment conditions showed continued sediment storage in the reach. The storage rate was sensitive to nourishment mass and grain size.
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Hull, Andrew J., Benjamin A. Cray, and Albert H. Nuttall. Stability Analysis of a Tensioned String With Periodic Supports. Fort Belvoir, VA: Defense Technical Information Center, May 2007. http://dx.doi.org/10.21236/ada470346.

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Mathurin, L., and K. Taylor-Pashow. STRUCTURAL STABILITY STUDY OF CRYSTALLINE SILICOTITANATE DISPERSED IN CAUSTIC SOLUTIONS FOR EXTENDED PERIODS. Office of Scientific and Technical Information (OSTI), August 2019. http://dx.doi.org/10.2172/1561211.

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Bielinskyi, A., S. Semerikov, V. Solovieva, and V. Soloviev. Levy distribution parameters as precursors of crisis phenomena. Видавничий будинок Мелітопольської міської друкарні, 2019. http://dx.doi.org/10.31812/123456789/3597.

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In spite of popularity of the Gaussian distribution in financial modeling, we demonstrated that Levy’s stable distribution is more suitable due to its theoretical reasons and analysis results. We study the possibility of construction indicators- precursors relying on one of the most power-law tailed distributions - Levy’s stable distribution. Here, we apply moving window based procedure for calculation of Levy’s parameters - a - stability and /?- skewness for daily values of Dow Jones Industrial Average (from 1 March 2000 to 28 March 2019), the gold price (from 1 April 1968 to 8 May 2019) and Brent crude oil price (from 2 January 1986 to 6 May 2019) which show their effectiveness as indicators of crisis states. For the construction of the indicators, were selected time series of and, accordingly, for oil. Dow Jones’ time series has the period from 2 January 1920 to 2019. We conclude that a and /3 parameters of Levy’s stable distribution of the observed assets, which demonstrate characteristic behavior for crash and critical states, can serve as an indicator-precursors of the unstable states.
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