Analysis of CTBT IMS Hydroacoustic hydrophone station underwater system electronics calibration sequences

2020 ◽  
Author(s):  
Mario Zampolli ◽  
Georgios Haralabus ◽  
Jerry Stanley ◽  
Peter Nielsen
Keyword(s):  
Cross Talk ◽  
The Other ◽  
System Response ◽  
Electronic Noise ◽  
Laboratory Environment ◽  
Accurate Knowledge ◽  
Ascension Island ◽  
Element Input ◽  
The Stability ◽  
Over Time

<p>The end-to-end calibration from the hydrophone ceramic element input to the digitizer output of CTBT IMS Hydroacoustic (HA) hydrophone stations is measured in a laboratory environment before deployment. After the hydrophones are deployed permanently with the Underwater System (UWS) hydrophone triplets, the response of the digitizer component can be measured by activating remotely a relay which excludes the hydrophone ceramic, preamplifier and riser cable, and feeds a pre-stored known waveform into the digitizer circuit via a digital-to-analogue converter. Analysis of these underwater calibration sequences makes it possible to verify the stability of the digitizer response over time and obtain useful information for investigations which require an accurate knowledge of the system response. Results are presented showing the stability of the UWS electronics response over time and one case, pertaining to the H10S triplet of HA10 Ascension Island, where changes in the calibration response appeared after the onset of electronic noise in one hydrophone channel with cross-talk to the other two channels.</p>

The puzzles of union density in Norway

2007 ◽  
Vol 13 (4) ◽  
pp. 653-670 ◽  
Author(s):  
Kristine Nergaard ◽  
Torgeir Aarvaag Stokke
Keyword(s):  
Labour Market ◽  
Unemployment Insurance ◽  
Union Density ◽  
The Other ◽  
European Countries ◽  
Nordic Region ◽  
Insurance Funds ◽  
Market Factors ◽  
The Stability ◽  
Over Time

The level of union density in Norway is medium high, in contrast to the other Nordic countries where high density levels are supported by unemployment insurance funds. Developments in union density over time are stable in Norway, contrary to developments in most western European countries outside the Nordic region. This article traces the effects of unemployment insurance funds by comparing density levels in Norway with those in Finland and Sweden. In addition, the stability witnessed in union density in Norway over time is a particularly puzzling phenomenon, and the authors seek to explain it on the basis of specific institutional and labour market factors.

A New Metric for Automated Stability Identification in Time Domain Milling Simulation

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Andrew Honeycutt ◽  
Tony L. Schmitz
Keyword(s):  
Time Domain ◽  
Forced Vibration ◽  
Stability Limit ◽  
Experimental Results ◽  
The Other ◽  
Sampled Data ◽  
A Value ◽  
Milling Simulation ◽  
The Stability ◽  
Over Time

A new metric is presented to automatically establish the stability limit for time domain milling simulation signals. It is based on periodically sampled data. Because stable cuts exhibit forced vibration, the sampled points repeat over time. Periodically sampled points for unstable cuts, on the other hand, do not repeat with each tooth passage. The metric leverages this difference to define a numerical value of nominally zero for a stable cut and a value greater than zero for an unstable cut. The metric is described and is applied to numerical and experimental results.

Pain patients’ experiences of validation and invalidation from physicians before and after multimodal pain rehabilitation: Associations with pain, negative affectivity, and treatment outcome

2017 ◽  
Vol 17 (1) ◽  
pp. 77-86 ◽  
Author(s):  
Sara M. Edlund ◽  
Matilda Wurm ◽  
Fredrik Holländare ◽  
Steven J. Linton ◽  
Alan E. Fruzzetti ◽  
...  
Keyword(s):  
Treatment Outcome ◽  
Negative Affectivity ◽  
Post Treatment ◽  
Patient Perceptions ◽  
The Other ◽  
Pain Interference ◽  
Before And After ◽  
The Stability ◽  
Pain Patients ◽  
Over Time

AbstractBackground and aimsValidating and invalidating responses play an important role in communication with pain patients, for example regarding emotion regulation and adherence to treatment. However, it is unclear how patients’ perceptions of validation and invalidation relate to patient characteristics and treatment outcome. The aim of this study was to investigate the occurrence of subgroups based on pain patients’ perceptions of validation and invalidation from their physicians. The stability of these perceptions and differences between subgroups regarding pain, pain interference, negative affectivity and treatment outcome were also explored.MethodsA total of 108 pain patients answered questionnaires regarding perceived validation and invalidation, pain severity, pain interference, and negative affectivity before and after pain rehabilitation treatment. Two cluster analyses using perceived validation and invalidation were performed, one on pre-scores and one on post-scores. The stability of patient perceptions from pre- to post-treatment was investigated, and clusters were compared on pain severity, pain interference, and negative affectivity. Finally, the connection between perceived validation and invalidation and treatment outcome was explored.ResultsThree clusters emerged both before and after treatment: (1) low validation and heightened invalidation, (2) moderate validation and invalidation, and (3) high validation and low invalidation. Perceptions of validation and invalidation were generally stable over time, although there were individuals whose perceptions changed. When compared to the other two clusters, the low validation/heightened invalidation cluster displayed significantly higher levels of pain interference and negative affectivity post-treatment but not pre-treatment. The whole sample significantly improved on pain interference and depression, but treatment outcome was independent of cluster. Unexpectedly, differences between clusters on pain interference and negative affectivity were only found post-treatment. This appeared to be due to the pre- and post-heightened invalidation clusters not containing the same individuals. Therefore, additional analyses were conducted to investigate the individuals who changed clusters. Results showed that patients scoring high on negative affectivity ended up in the heightened invalidation cluster post-treatment.ConclusionsTaken together, most patients felt understood when communicating with their rehabilitation physician. However, a smaller group of patients experienced the opposite: low levels of validation and heightened levels of invalidation. This group stood out as more problematic, reporting greater pain interference and negative affectivity when compared to the other groups after treatment. Patient perceptions were typically stable over time, but some individuals changed cluster, and these movements seemed to be related to negative affectivity and pain interference. These results do not support a connection between perceived validation and invalidation from physicians (meeting the patients pre- and post-treatment) and treatment outcome. Overall, our results suggest that there is a connection between negative affectivity and pain interference in the patients, and perceived validation and invalidation from the physicians.ImplicationsIn clinical practice, it is important to pay attention to comorbid psychological problems and level of pain interference, since these factors may negatively influence effective communication. A focus on decreasing invalidating responses and/or increasing validating responses might be particularly important for patients with high levels of psychological problems and pain interference.

scholarly journals Ciclos económicos y variables monetarias y financieras en México, 1980-2019: un enfoque de cambio estructural

2021 ◽  
Vol 40 (2) ◽  
pp. 137-158
Author(s):  
Reyna Vergara González ◽  
Pablo Mejía Reyes ◽  
Miguel Angel Díaz Carreño
Keyword(s):  
Structural Changes ◽  
Nominal Exchange Rate ◽  
The Other ◽  
Economic Conditions ◽  
Financial Variables ◽  
The Business Cycle ◽  
The Stability ◽  
The Relationship ◽  
Cycle Indicator ◽  
Over Time

El objetivo de este documento es analizar la relación entre el ciclo económico y diversas variables monetarias y financieras con el fin de determinar si han sido estables en el tiempo, teniendo en cuenta los efectos de las modificaciones en las condiciones económicas generales, la estrategia específica adoptada de política monetaria en diferentes subperiodos y las condiciones institucionales en que esta se maneja. Para probar la estabilidad de estas relaciones, una vez que se obtienen los indicadores del ciclo mediante los filtros convencionales, se emplea la metodología de cambio estructural de Bai y Perron (1998). Los resultados destacan dos cambios estructurales en la relación entre el indicador del ciclo y las variables de inflación, tasa de interés, tipo de cambio nominal y agregados monetarios nominales, uno a mediados de los años ochenta y el otro a mediados de los noventa.   Abstract   This paper aims to analyze the relationship between the business cycle and various monetary and financial variables. In particular, the paper seeks to determine whether this relationship has been stable over time, considering the effects of the changes in the general economic conditions, the specific monetary policy strategy adopted in different subperiods, and the institutional framework in which this is managed. To test the stability of these relationships, once the cycle indicators are obtained using conventional filters, the structural change methodology of Bai and Perron (1998) is used. The results highlight two structural changes in the relationship between the cycle indicator and inflation, interest rate, nominal exchange rate, and nominal monetary aggregates, one in the mid-eighties and the other in the middle of the nineties.

Uniformity of Magnification from Different Electron Microscopes

1967 ◽  
Vol 25 ◽  
pp. 32-33
Author(s):  
Godfrey C. Hoskins ◽  
V. Williams ◽  
V. Allison
Keyword(s):  
Diffraction Grating ◽  
The Other ◽  
Carbon Replica ◽  
Electron Microscopes ◽  
The Stability

The method demonstrated is an adaptation of a proven procedure for accurately determining the magnification of light photomicrographs. Because of the stability of modern electrical lenses, the method is shown to be directly applicable for providing precise reproducibility of magnification in various models of electron microscopes.A readily recognizable area of a carbon replica of a crossed-line diffraction grating is used as a standard. The same area of the standard was photographed in Phillips EM 200, Hitachi HU-11B2, and RCA EMU 3F electron microscopes at taps representative of the range of magnification of each. Negatives from one microscope were selected as guides and printed at convenient magnifications; then negatives from each of the other microscopes were projected to register with these prints. By deferring measurement to the print rather than comparing negatives, correspondence of magnification of the specimen in the three microscopes could be brought to within 2%.

On the Robustness of Solution Strategy Classifications

2010 ◽  
Vol 31 (2) ◽  
pp. 68-73 ◽  
Author(s):  
María José Contreras ◽  
Víctor J. Rubio ◽  
Daniel Peña ◽  
José Santacreu
Keyword(s):  
Individual Differences ◽  
Study Strategies ◽  
Solution Strategy ◽  
Specific Test ◽  
Spatial Tasks ◽  
The Stability ◽  
Strategy Changes ◽  
Over Time

Individual differences in performance when solving spatial tasks can be partly explained by differences in the strategies used. Two main difficulties arise when studying such strategies: the identification of the strategy itself and the stability of the strategy over time. In the present study strategies were separated into three categories: segmented (analytic), holistic-feedback dependent, and holistic-planned, according to the procedure described by Peña, Contreras, Shih, and Santacreu (2008) . A group of individuals were evaluated twice on a 1-year test-retest basis. During the 1-year interval between tests, the participants were not able to prepare for the specific test used in this study or similar ones. It was found that 60% of the individuals kept the same strategy throughout the tests. When strategy changes did occur, they were usually due to a better strategy. These results prove the robustness of using strategy-based procedures for studying individual differences in spatial tasks.

On the Stability of Evaluative Conditioning Effects

2013 ◽  
Vol 44 (6) ◽  
pp. 380-389 ◽  
Author(s):  
Sabine Förderer ◽  
Christian Unkelbach
Keyword(s):  
Evaluative Conditioning ◽  
Indirect Measures ◽  
The Stability ◽  
Over Time

Evaluative conditioning (EC) refers to valence changes in neutral stimuli (CSs) through repeated pairing with liked or disliked stimuli (USs). The present study examined the stability of EC effects in the course of 1 week. We investigated how this stability depends on memory for US valence and US identity. We also investigated whether CSs evaluations occurring immediately after conditioning (i.e., evaluative consolidation) are necessary for stable EC effects. Participants showed stable EC effects on direct and indirect measures, independent of evaluations immediately after conditioning. EC effects depended on memory for US valence but not for US identity. And although memory decreased significantly over time, EC effects remained stable. These data suggest that evaluative consolidation is not necessary, and that conditioned preferences and attitudes might persist even when people do not remember the concrete source anymore.

Emotional Impact Feedback Changes How We Remember Negative Autobiographical Experiences

2010 ◽  
Vol 57 (5) ◽  
pp. 354-359 ◽  
Author(s):  
Melanie K. T. Takarangi ◽  
Deryn Strange
Keyword(s):  
Well Being ◽  
The Other ◽  
Personal Perspective ◽  
Emotional Impact ◽  
Potential Mechanism ◽  
Negative Experiences ◽  
Negative Memory ◽  
The Relationship ◽  
Negative Memories ◽  
Over Time

When people are told that their negative memories are worse than other people’s, do they later remember those events differently? We asked participants to recall a recent negative memory then, 24 h later, we gave some participants feedback about the emotional impact of their event – stating it was more or less negative compared to other people’s experiences. One week later, participants recalled the event again. We predicted that if feedback affected how participants remembered their negative experiences, their ratings of the memory’s characteristics should change over time. That is, when participants are told that their negative event is extremely negative, their memories should be more vivid, recollected strongly, and remembered from a personal perspective, compared to participants in the other conditions. Our results provide support for this hypothesis. We suggest that external feedback might be a potential mechanism in the relationship between negative memories and psychological well-being.

Coevolution

2017 ◽  
Author(s):  
Avi Max Spiegel
Keyword(s):  
The Other ◽  
The Political ◽  
Over Time ◽  
Islamist Movements

This chapter seeks to understand how Islamist movements have evolved over time, and, in the process, provide important background on the political and religious contexts of the movements in question. In particular, it shows that Islamist movements coevolve. Focusing on the histories of Morocco's two main Islamist movements—the Justice and Spirituality Organization, or Al Adl wal Ihsan (Al Adl) and the Party of Justice and Development (PJD)—it suggests that their evolutions can only be fully appreciated if they are relayed in unison. These movements mirror one another depending on the competitive context, sometimes reflecting, sometimes refracting, sometimes borrowing, sometimes adapting or even reorganizing in order to keep up with the other.

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