scholarly journals Statistical Frequency

2020 ◽  
Author(s):  
Keyword(s):  
Statistical Frequency

scholarly journals Controlled Switching of the T402 Transformer in the Križovany 400kV Substation

2010 ◽  
Vol 61 (1) ◽  
pp. 11-19
Author(s):  
František Janíček ◽  
Martin Mucha ◽  
Karol Česnek ◽  
Jozef Kováčik
Keyword(s):  
Control Unit ◽  
Simulation Software ◽  
Transient Phenomena ◽  
Controlled Switching ◽  
Transient Electromagnetic ◽  
Statistical Frequency

Controlled Switching of the T402 Transformer in the Križovany 400kV Substation The paper deals with simulating the circumstances of switching surge and trigger current at switching-in of the T402 autotransformer recently installed in Križovany, with the tests conducted by means of ATP (Alternative Transient Program) simulation software for simulating transient electromagnetic phenomena. The target has been to determine temporal curves for the most critical surge instances against earth and between the phases and the curves for trigger current with and without surge limiters connected, and to determine by means of simulations the size and statistical frequency of switching surges and based on a controlled switching simulation, to describe the elimination of transient phenomena during the process and in reference to the simulations and to operating manual for the PSD02 Siemens control unit, suggest the required configuration settings for the unit.

Collagen and elastin fibers in human pulmonary alveolar walls

1988 ◽  
Vol 64 (4) ◽  
pp. 1659-1675 ◽  
Author(s):  
S. S. Sobin ◽  
Y. C. Fung ◽  
H. M. Tremer
Keyword(s):  
Transpulmonary Pressure ◽  
Collagen Fibers ◽  
Capillary Blood ◽  
Fiber Bundles ◽  
Cube Root ◽  
Inflation Pressure ◽  
Frequency Distributions ◽  
Normal Distributions ◽  
Statistical Frequency ◽  
The Mean

The morphology and morphometric data of collagen and elastin fibers in the pulmonary alveolar walls are presented. Specimens were obtained from postmortem lungs quick-frozen at specified transpulmonary pressures. Collagen was stained by silver, and elastin was stained by orcein. Photomicrographs were composed by computer. Young lungs typically show small collagen fibers that radiate from the "posts," whereas larger fiber bundles traverse the septum irrespective of capillary blood vessels. In older lungs, rings of collagen around the posts appear enlarged. Elastin bundles do not show obvious variation in pattern with age and inflation pressure. Statistical frequency distributions of the fiber width and curvature are both skewed, but the square root of the width and the cube root of the curvature have approximate normal distributions. Typically, for young lungs at transpulmonary pressure of 4 cmH2O, the mean of (width)1/2 (in micron1/2) for collagen fibers is 0.952 +/- 0.242 (SD), that of (curvature)1/3 (in micron-1/3) is 0.349 +/- 0.094. The corresponding values for elastin are 0.986 +/- 0.255 and 0.395 +/- 0.094.

Normalkoordinatenanalyse und Frequenzberechnungen für die isotopomeren closo-Hydrohexaborate 11Bn10B6-nH62- , n = 0 – 6 / Normal Coordinate Analysis and Frequency Calculations of Isotopomeric closo-Hydrohexaborates 11Bn10B6-nH62- , n = 0 – 6

1990 ◽  
Vol 45 (5) ◽  
pp. 641-646 ◽  
Author(s):  
J. Thesing ◽  
W. Preetz
Keyword(s):  
Potential Energy Distribution ◽  
Geometric Isomers ◽  
Normal Coordinate ◽  
Valence Force Field ◽  
Small Coupling ◽  
Atomic Displacements ◽  
Symmetry Coordinates ◽  
Statistical Frequency ◽  
Degenerate Modes ◽  
Ir And Raman

Normal coordinate analyses for the ten isotopomers Cs211Bn10B6-nH6, n = 0 — 6, including the pairs of geometric isomers for n = 2, 3, 4 have been performed, based on a general valence force field. The shift of the bands as well as the splitting of degenerate modes by lowered symmetry due to exchange of 10B by 11B or H by D is exactly calculated by a set of six force constants. The characteristic band patterns observed in the IR and Raman spectra of Cs2B6H6 with natural abundance of B isotopes (80.22% 11B, 19.78% 10B) measured at 10 K are explained by the superposition of the calculated spectra of the different isotopomers present, according to their statistical frequency distribution. The calculated atomic displacements and the potential energy distribution on the symmetry coordinates reveal only a small coupling (PED < 10%) between the cage (in-phase displacements of H and B) and substituent vibrations (anti-phase motions of B and H). Based on the normal coordinate analyses previously obtained assignments for several bands are revised.

scholarly journals Recurrent frequency-size distribution of characteristic events

2009 ◽  
Vol 16 (2) ◽  
pp. 333-350 ◽  
Author(s):  
S. G. Abaimov ◽  
K. F. Tiampo ◽  
D. L. Turcotte ◽  
J. B. Rundle
Keyword(s):  
Weibull Distribution ◽  
Passage Time ◽  
Time Interval ◽  
Weibull Distributions ◽  
Event Sequences ◽  
San Andreas ◽  
Statistical Frequency ◽  
Earthquake Sequences ◽  
Best Fit ◽  
Frequency Magnitude

Abstract. Statistical frequency-size (frequency-magnitude) properties of earthquake occurrence play an important role in seismic hazard assessments. The behavior of earthquakes is represented by two different statistics: interoccurrent behavior in a region and recurrent behavior at a given point on a fault (or at a given fault). The interoccurrent frequency-size behavior has been investigated by many authors and generally obeys the power-law Gutenberg-Richter distribution to a good approximation. It is expected that the recurrent frequency-size behavior should obey different statistics. However, this problem has received little attention because historic earthquake sequences do not contain enough events to reconstruct the necessary statistics. To overcome this lack of data, this paper investigates the recurrent frequency-size behavior for several problems. First, the sequences of creep events on a creeping section of the San Andreas fault are investigated. The applicability of the Brownian passage-time, lognormal, and Weibull distributions to the recurrent frequency-size statistics of slip events is tested and the Weibull distribution is found to be the best-fit distribution. To verify this result the behaviors of numerical slider-block and sand-pile models are investigated and the Weibull distribution is confirmed as the applicable distribution for these models as well. Exponents β of the best-fit Weibull distributions for the observed creep event sequences and for the slider-block model are found to have similar values ranging from 1.6 to 2.2 with the corresponding aperiodicities CV of the applied distribution ranging from 0.47 to 0.64. We also note similarities between recurrent time-interval statistics and recurrent frequency-size statistics.

Occupational diseases: absenteeism for the prevalence of pain in the musculoskeletal system in nursing professionals working in the surgical center

2010 ◽  
Vol 4 (4) ◽  
pp. 1669 ◽  
Author(s):  
Geilsa Soraia Cavalcanti Valente ◽  
Angélica Santos De Souza ◽  
Lucia Helena França Ferreira ◽  
Allysson Higino Silva
Keyword(s):  
Data Collection ◽  
Rio De Janeiro ◽  
Occupational Diseases ◽  
High Rate ◽  
Musculoskeletal Symptoms ◽  
Cervical Region ◽  
Research Committee ◽  
Statistical Frequency ◽  
Prevalence Of Pain ◽  
Nursing Professionals

ABSTRACTObjective: to assess the prevalence of musculoskeletal symptoms in workers of nurses in the operating room. Method: search of a quantitative approach. The population is composed of 21 nursing professionals. The data collection occurred between August and September 2008. The data were calculated by simple statistical frequency. The ethical aspects have been respected, and the research project approved by the Ethics and Research Committee of the Municipal Health Secretariat of Rio de Janeiro - RJ and registered under No. 150/08. The instruments for data collection were the Nordic Questionnaire of musculoskeletal symptoms and diagram Collert. Results: 91% reported some type of musculoskeletal symptoms in the last 7 days and 100% in the last 12 months. The highest prevalence of symptoms, according to the anatomical areas: low back, shoulders, dorsal and cervical region. Of the 21 respondents, 42% missed work over the past 12 months due to these symptoms. Conclusion: it was found that the high prevalence of musculoskeletal symptoms, causing a high rate of absenteeism in the nursing team. It was evident the need for preventive work of health education, as the posture adopted in carrying out work activities in nursing. Descriptors: occupational diseases; pain referred; absenteeism; occupational health; nurse's practice patterns.RESUMOObjetivo: avaliar a prevalência de sintomas músculo-esqueléticos em trabalhadores de Enfermagem que atuam em centro cirurgico. Método: pesquisa de abordagem quantitativa. A população é composta por 21 profissionais de Enfermagem. A coleta de dados de deu entre agosto e setembro de 2008. Os dados foram calculados por frequência estatística simples. Os aspectos éticos foram respeitados, sendo o projeto de pesquisa aprovado pelo Comitê de Ética e Pesquisa da Secretaria Municipal de Saúde do Rio de Janeiro – RJ e registrado sob nº 150/08.  Os instrumentos para coleta de dados foram o questionário Nórdico de sintomas musculoesqueléticos e o diagrama de Collert. Resultados: 91% referiram algum tipo de sintoma músculo esquelético nos últimos 7 dias e 100% nos últimos 12 meses. As mais elevadas prevalências de sintomas, segundo as áreas anatômicas, foram: região lombar, ombros, região dorsal e região cervical. Dos 21 respondentes, 42% faltaram ao trabalho nos últimos 12 meses devido a estes sintomas. Conclusão: verificou-se que é alta a prevalência de sintomas musculoesqueléticos, ocasionando alto índice de absenteísmo na equipe de Enfermagem. Evidenciou-se a necessidade do trabalho preventivo de educação em saúde, quanto à postura adotada na execução das atividades laborais na Enfermagem. Descritores: doenças profissionais; dor referida; absenteísmo; saúde do trabalhador; condições de trabalho; normas de prática de enfermagem.RESUMEN Objetivo: evaluar la prevalencia de síntomas músculo-esqueléticos en los trabajadores de las enfermeras en la sala de operaciones. Método: búsqueda de un enfoque cuantitativo. La población se compone de 21 profesionales de enfermería. La recogida de datos se produjo entre agosto y septiembre de 2008. Los datos fueron calculados por la frecuencia estadística simple. Los aspectos éticos han sido respetados, y el proyecto de investigación aprobado por la Ética y el Comité de Investigación de la Secretaría Municipal de Salud de Rio de Janeiro - RJ y registrado bajo el N º 150/08. Los instrumentos de recolección de datos fueron el cuestionario de síntomas musculoesqueléticos nórdicos y el diagrama de Collert. Resultados: 91% reportó algún tipo de síntomas musculoesqueléticos en los últimos 7 días y 100% en los últimos 12 meses. La mayor prevalencia de síntomas, según las zonas anatómicas: baja de la espalda, hombros, región dorsal y cervical. De los 21 encuestados, 42% faltó al trabajo durante los últimos 12 meses debido a estos síntomas. Conclusión: se encontró que la alta prevalencia de síntomas músculo-esqueléticos, provocando una alta tasa de absentismo en el equipo de enfermería. Era evidente la necesidad de una labor preventiva de educación para la salud, como la postura adoptada en la realización de actividades de trabajo en la enfermería. Descriptores:  enfermedades profesionales; dolor referido; absentismo; salud laboral; pautas prácticas de enfermería. 

Phonetic Analysis of Pronounceability

1970 ◽  
Vol 27 (2) ◽  
pp. 583-587 ◽  
Author(s):  
John L. Locke
Keyword(s):  
Spoken English ◽  
Statistical Frequency ◽  
Speech Information ◽  
Insight Into

Phonetic transcriptions of 239 trigram pronunciations were obtained and analyzed in order to determine the amount and type of speech information they contained, and possibly, to gain some insight into the parameters of pronounceability. When pronounced, trigrams yielded from 2 to 6 phonemes in 8 different syllable structures and were either monosyllabic or disyllabic. Neither the statistical frequency of phoneme contexts in spoken English or the motoric ease of phoneme articulation were observed to explain adequately the ease or difficulty of pronouncing trigrams. A more likely explanation, the presence or absence of grapheme-phoneme correspondence, did not appear to account for all variations in rated pronounceability.

scholarly journals Grey literature – grey sources? Nuancing the view on professional documentation

2015 ◽  
Vol 71 (6) ◽  
pp. 1158-1182 ◽  
Author(s):  
Lisa Börjesson
Keyword(s):  
Grey Literature ◽  
Field Evaluation ◽  
Frame Of Reference ◽  
Future Research ◽  
Research Attention ◽  
Content Type ◽  
Use Patterns ◽  
Archaeological Work ◽  
Statistical Frequency ◽  
Source Use

Purpose – The purpose of this paper is to nuance the perception about professional documentation (a.k.a. “grey literature”), assuming perception of documentation being a cultural aspect of accessibility. Design/methodology/approach – The study explores variations within the archaeological report genre through a bibliometric analysis of source use. Source characteristics are explored as well as correlations between report authors and source originators. Statistical frequency distribution is complemented by a correspondence analysis and a k-means cluster analysis to explore patterns. The patterns are interpreted as “frames of references” and related to circumstances for archaeological work. The study also discusses source representations. Findings – The source use patterns reveal a latent variation, not visible in the general analysis: a professional/academic frame of reference (mainly among authors affiliated with incorporated businesses and sole proprietorships) and an administrative frame of reference (mainly among authors affiliated with government agencies, foundations, and member associations) emerge. Research limitations/implications – The study focuses on Swedish field evaluation reports. Future research could test the results in relation to other types of reports and go beyond the document perspective to explore source use in documentation practices. Social implications – The results on variations in frames of references among report writers have implication for report readers and user. The results should also be considered in archaeology management and policy-making. On the level of source representation the results call for clarifications of vague representations and possibly omitted sources. Originality/value – This study contextualizes archaeological information use and focuses on variations in professional archaeology which has received little previous research attention. The bibliometric approach complements previous qualitative studies of archaeological information.

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