Quantifying evolution of aftershocks sequences by Delta/Sigma method: a parametric analysis

2020 ◽  
Author(s):  
Domenico Caccamo ◽  
Vincenza Pirrone ◽  
Antonella Peresan ◽  
Roberto Lotronto
Keyword(s):  
Time Window ◽  
Statistical Significance ◽  
Relevant Information ◽  
Aftershock Sequence ◽  
Significant Information ◽  
Investigation Area ◽  
Temporal Decay ◽  
Omori Law ◽  
Delta Sigma ◽  
The Stability

<p>The Delta/Sigma method is applied in this study to investigate the seismic sequences following major earthquakes, with the aim to understand whether they fit the classical laws of aftershocks occurrence, such as the classical Omori Law and its recent variants, and to explore whether observed deviations from these laws may provide some statistically significant information about the possible occurrence of further large aftershocks. Specifically, the Delta/Sigma method is based on the observation of possible anomalies in the temporal decay of an aftershock sequence. In fact, given the number of events actually observed within a time window U (e.g. 1 day), its difference (Delta) with respect to theoretical number of events, and its standard deviation (Sigma), it was found that, before the occurrence of large aftershocks, the Delta/Sigma ratio may reach rather high values (e.g. above 2-2.5), which can be possibly followed within few days by some relevant aftershocks. The investigation area (referred as "Box") is defined as a rectangular sector, with dimensions proportional to the magnitude M of the mainshock, and with barycenter computed based on aftershocks occurred during the first Tb days from the mainshock.</p><p>To investigate the performances of the Delta/Sigma method various earthquake sequences are selected from different regions worldwide, including those associated with recent destructive earthquakes in Italy and Iran. The input data necessary for this study are extracted from global datasets (ANSS-USGS and ISC catalogs) and regional catalogs (e.g. ISIDE bulletins for the Italian territory). A wide set of parametrics tests is carried out in order to verify if this method could forecast the moderate and large aftershocks, which occurred in the region surrounding the mainshocks epicenter. Different input parameters are considered, in order to check the stability and statistical significance of the obtained results.</p><p>The preliminary results suggest that the application of Delta/Sigma method could highlight the possible occurrence of several significant aftershocks. Careful assessment of forecasting capability is essential, in order to provide relevant information for mitigation of risks associated with large aftershocks occurrence.</p>

An impact of intima media thickness of carotids in cardio vascular profile

2020 ◽  
Vol 10 (2) ◽  
pp. 48-52
Author(s):  
Jeevitha M ◽  
Kalaichandar M ◽  
Kirubakaran K ◽  
Baskaran V ◽  
Kokila K ◽  
...  
Keyword(s):  
Blood Pressure ◽  
High Blood Pressure ◽  
Statistical Significance ◽  
Intima Media Thickness ◽  
Cardio Vascular ◽  
Intima Medial Thickness ◽  
The Stability ◽  
Carotid Intima Medial Thickness ◽  
Oral Sodium ◽  
Worse Prognosis

Low blood pressure truly includes a worse prognosis than the excessive blood strain. This mechanism,bills for the "reverse causation "seen within the haemodialysis’ patients, the company of conventional risk elements, such as high blood pressure, hyperlipidemia, and obesity, appear to be a worst diagnosis.Exogenous erythropoietic products can growth blood strain and requirement of antihypertensive tablets.30 Chronic ECFV overload secondary to activation of renin-angiotensin-aldosterone axisand disturbances inside the stability of vasoconstrictors and the vasodilators make a contribution to high blood pressure. Improvement in blood pressure can be introduced out with oral sodium restriction, diuretics, and fluid elimination with dialysis. Some patients will continue to be hypertensive notwithstanding of the careful attention to ECFV reputation. LVH is related with reduced endurance of sufferers on hemo/peritoneal dialysis .Lower five year survival charge in ESRD patients with LVH have a 30% than people missing LVH. This have a look at produces the mean carotid artery intima-medial thickness turned into higher in sufferers with superior CKD although it did now not attain statistical significance, probable due to smaller sample size.It was also observed that carotid intima medial thickness had no correlation with dyslipidemia. Even though the patients had maintained significantly normal cholesterol and high HDL levels, there was an increase in CIMT. Therefore, CKD patients, CIMT cannot be predicted based on the traditional atherosclerotic risk factors like serum cholesterol and HDL.

Nowcasting global trade in goods and services

2020 ◽  
pp. 1-19
Author(s):  
Fernando Cantú-Bazaldúa
Keyword(s):  
Real Time ◽  
Relevant Information ◽  
Global Trade ◽  
Dynamic Factor ◽  
Timely Manner ◽  
Short Term ◽  
Dynamic Factor Models ◽  
Significant Information ◽  
Goods And Services ◽  
World Economic

World economic aggregates are compiled infrequently and released after considerable lags. There are, however, many potentially relevant series released in a timely manner and at a higher frequency that could provide significant information about the evolution of global aggregates. The challenge is then to extract the relevant information from this multitude of indicators and combine it to track the real-time evolution of the target variables. We develop a methodology based on dynamic factor models adapted for variables with heterogeneous frequencies, ragged ends and missing data. We apply this methodology to nowcast global trade in goods in goods and services. In addition to monitoring these variables in real time, this method can also be used to obtain short-term forecasts based on the most up-to-date values of the underlying indicators.

Three-component analysis of regional seismograms

1990 ◽  
Vol 80 (6B) ◽  
pp. 2032-2052 ◽  
Author(s):  
D. C. Jepsen ◽  
B. L. N. Kennett
Keyword(s):  
Free Surface ◽  
Time Window ◽  
Seismic Station ◽  
P Wave ◽  
Sh Waves ◽  
Near Surface ◽  
Source Discrimination ◽  
Decomposition Scheme ◽  
Phased Array Techniques ◽  
The Stability

Abstract Both phased array techniques for single-component sensors and vectorial analysis of three-component recordings can provide estimates of the azimuth and slowness of seismic phases. However, a combination of these approaches provides a more powerful tool to estimate the propagation characteristics of different seismic phases at regional distances. Conventional approaches to the analysis of three-component seismic records endeavor to exploit the apparent angles of propagation in horizontal and vertical planes as well as the polarization of the waves. The basic assumption is that for a given time window there is a dominant wavetype (e.g., a P wave) traveling in a particular direction arriving at the seismic station. By testing a range of characteristics of the three-component records, a set of rules can be established for classifying much of the seismogram in terms of wavetype and direction. It is, however, difficult to recognize SH waves in the presence of other wavetypes. Problems also arise when more than one signal (in either wavetype or direction) arrive in the same window. The stability and robustness of the classification scheme is much improved when records from an array of three-component sensors are combined. For a set of three-component instruments forming part of a larger array, it is possible to estimate the slowness and azimuth of arrivals from the main array and then extract the relative proportions of the current P-, SV-, and SH-wave contributions to the seismogram. This form of wavetype decomposition depends on a model of near-surface propagation. A convenient choice for hard-rock sites is to include just the effect of the free surface, which generates a frequency-independent operation on the three-component seismograms and which is not very sensitive to surface velocities. This approach generates good estimates of the character of the S wavefield, because the phase distortion of SV induced by the free surface can be removed. The method has been successfully applied to regional seismograms recorded at the medium aperture Warramunga array in northern Australia, and the two small arrays NORESS and ARCESS in Norway, which were designed for studies of regional phases. The new wavefield decomposition scheme provides results in which the relative proportions of P, SV, and SH waves as a function of time can be compared without the distortion imposed by free surface amplification. Such information can provide a useful adjunct to existing measures of signal character used in source discrimination.

scholarly journals Irrational ideas and social fear among students of faculties of applied sciences in the Sultanate of Oman according to gender variables and academic specialization: الأفكار اللاعقلانية والخوف الاجتماعي لدى طلبة كليات العلوم التطبيقية بسلطنة عمان وفق متغيرات النوع الاجتماعي والتخصص الأكاديمي

2017 ◽  
Vol 1 (8) ◽  
Author(s):  
Nasra Muslim Hamad Al - Ghafri
Keyword(s):  
Applied Sciences ◽  
Statistical Significance ◽  
Sultanate Of Oman ◽  
Social Scale ◽  
The Social ◽  
Social Fear ◽  
The Stability ◽  
Academic Specialization

The aim of the study was to identify the level of the most irrational ideas among the students of faculties of applied sciences, to identify the level of social fear among the students of faculties of applied sciences and to identify whether there were statistically significant differences in the effect of the spread of irrational ideas and the level of social fear according to variables (The type of specialization). The population of the study included all the students of faculties of applied sciences in (Ibri-Nizwa-Rustaq), (4568). The sample of the study was chosen in the available way, with 282 students. Descriptive descriptive in This study was developed as a tool to measure irrational ideas and a tool was developed to measure social fear. The validity of the tools was verified through the method of arbitration. The stability of the tool was estimated in the Alpha Kronbach method and the results showed that the two tools were acceptable and reliable. The degree of spread of irrational ideas among the students of faculties of applied sciences was medium, while the degree of spread of the level of social fear among students of faculties of applied sciences medium, and the results showed that there are no differences of statistical significance according to variables of type and specialization of the scale of ideas not Qlanah results also showed that there were no statistically significant differences according to the variables of type and specialization of the social scale of fear ..

scholarly journals Criteria for evaluating the competencies of the school counselor at the basic education stage from the point of view of school principals in the state of Khartoum: معايير تقويم كفايات المرشد المدرسي بمرحلة تعليم الاساس من وجهة نظر مدراء المدارس بولاية الخرطوم

2017 ◽  
Vol 1 (3) ◽  
Author(s):  
Ikhlas Hassan Sayyid Echriya ◽  
Reham Anwar Mohammed Hassan
Keyword(s):  
School Counselor ◽  
Basic Education ◽  
School Principals ◽  
Pearson Correlation ◽  
Statistical Significance ◽  
Correlation Equation ◽  
Significance Test ◽  
Point Of View ◽  
The Stability ◽  
Extension Process

The aim of this study was to investigate the criteria of evaluating the competencies of the school counselor in the basic education stage, from the point of view of the school principals in Khartoum State, to achieve the objectives of the study. The researchers prepared a questionnaire that was applied during the academic year 2014-2015 to a random sample of 20 managers in basic education Khartoum, a maritime locality, the questionnaire contains six criteria for evaluating the school's competencies: planning the extension process, implementing the extension process, designing the extension programs, effective communication skills, using the technique in the extension process, In order to ascertain the stability and validity of the questionnaire, by means of the Alpha Kronbach equation and to verify the persistence of the questionnaire by Pearson correlation equation for the questionnaire items in the overall degree of the questionnaire, the sincerity of the arbitrators was measured by presenting it to a number of curriculum experts and pedagogic and educational psychologists in different Sudanese universities. Statistical packages of social sciences (SPSS), and statistical methods used to analyze repetitive data: percentages, arithmetical averages, standard deviations, mono variance, applied statistical significance test (T) The results of the study were reached by a number of recommendations, the most important of which are the need to develop an integrated methodology and a clear job description. For the role of the educational guide, and the process of educational guidance of schools based on the academic procedures of higher education, the need to contribute sections of educational psychology in the quality models and procedures to control and follow up the implementation of strategic plans for the tasks of the school guide and evaluate, The number of educational counselors for the number of learners and the creation of the guiding environment.

scholarly journals IS THE CAPITAL STRUCTURE STABLE IN BRAZIL?

2019 ◽  
Vol 20 (4) ◽  
Author(s):  
PÂMELA A. TRISTÃO ◽  
IGOR B. SONZA
Keyword(s):  
Capital Structure ◽  
Statistical Significance ◽  
Graphical Analysis ◽  
Structure Stability ◽  
Publicly Traded ◽  
Publicly Traded Companies ◽  
Tax Benefits ◽  
The Stability ◽  
Second Period ◽  
The Capital Structure

ABSTRACT Purpose: This paper’s objective is to analyze whether the capital structure of Brazilian publicly traded companies remained stable over the last twenty years. Originality/value: The paper is focused on the Brazilian capital market, in which there is a lack in the literature about the study of the leverage behavior and its immaturity, where factors related to the companies and characteristics in contracting leverage alter the demand of credit. Design/methodology/approach: To achieve its objective, initially a graphical analysis of market and book debt evolution was carried out, and a GMM-Sys regression model through panel data was estimated to identify the stability of leverage along time. Findings: The results indicate a reduction of the market leverage with higher statistical significance after 2008, indicating, both in the graphic and the regression analysis, that the use of debt was unstable in the first period analyzed (1995-2007), behavior not observed during the second period (2008-2015) when analyzed market measures in which capital structure stability was prevalent, with considerable reduction of corporate leverage, otherwise, book measures of leverage would have shown a stability trend in leverage patterns. The principal determinants of the capital structure were the tax benefits (book debt) and the size (market debt), supporting trade-off theory.

scholarly journals STABILITY STUDY OF AMLODIPINE BESYLATE AND BISOPROLOL FUMARATE IN AQUEOUS SOLUTIONS

2014 ◽  
Vol 5 (2) ◽  
Author(s):  
Irena Kasagić Vujanović ◽  
Dijana Jelić ◽  
Vesna Antunović ◽  
Biljana Jančić Stojanović ◽  
Darko Ivanović
Keyword(s):  
Relevant Information ◽  
Pharmaceutical Product ◽  
Stability Study ◽  
Amlodipine Besylate ◽  
Time Intervals ◽  
Constant Rate ◽  
Different Temperatures ◽  
The Media ◽  
Two Temperatures ◽  
The Stability

Valuable information concerning stability of compounds can be obtained by using different media (water, hydrochloric acid or sodium hydroxide) for dissolution of active pharmaceutical substances. Furthermore, additional knowledge is gained by performing experiments at different temperatures. This research paper deals with the stability of amlodipine besylate and bisoprolol fumarate in different media at different temperatures, whereby certain conclusions are drawn. For stability assessment, chemical kinetics approach was used, and constant rate (k), half-time (t1/2) and activation energy (Ea) were used for prediction of compound stability degree. The stability of amlodipine besylate and bisoprolol fumarate were tested, both separately and in mixture, in water and in 0.01M HCl. All the investigated solutions were treated at two temperatures 25° and 70°C at the following time intervals: 0, 1 h, 24 h, 48 h and 72 h. Hydrophilic Interaction Liquid Chromatography – HILIC method, previously developed and validated, was used. On the basis of obtained results it was concluded that amlodipine-besylate was more stable in water than in acid medium, more stable in mixture rather than individually and more stable at lower temperatures. This was confirmed by the obtained values of monitored parameters: amlodipine besylate Ea = 30.68 kJ mol-1, k (25 °C) = 0.000333 mM h-1, k (70 °C) = 0.00169 mM h-1; amlodipine besylate in mixture Ea = 42,414 kJ mol-1, k (25 °C) = 1.27∙10-4 mM h-1, k (70 °C) = 0.0012 mM h-1. Based on the obtained approximate Ea value for bisoprolol fumarate in acid (59 kJ mol-1) and in water (56 kJ mol-1), bisoprolol fumarate showed excellent stability against the media in which it was studied. On the other hand, the temperature had a significant effect on the stability of bisoprolol fumarate. These results provide the relevant information about the stability of the tested active substances, and may be of importance during the development of an appropriate pharmaceutical product. A bigger influence on the stability of bisoprolol fumarate had a temperature effect.

Assessment of The Digestive System Malignancy Information in Wikipedia and Baidu Encyclopedia: Longitudinal Study (Preprint)

2021 ◽  
Author(s):  
Jianchen Luo ◽  
Jing Ma ◽  
Liangliang Xu ◽  
Lian Li ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Digestive System ◽  
Medical Information ◽  
Statistical Significance ◽  
Relevant Information ◽  
Medical Professional ◽  
The Internet ◽  
Treatment Information ◽  
International Statistical Classification ◽  
The Difference ◽  
Search For Information

BACKGROUND The Internet has gradually become the most important way for people to search for information. Increasing number of people searched for relevant information or even treatment plans on the Internet when they get health problem. The reliability of the medical information provided online remains to be proved. Wikipedia and Baidu Encyclopedia are the most widely used search engines in English and Chinese, respectively. The quality of the medical information they provide needs to be assessed. OBJECTIVE This study aimed to evaluate the quality and timeliness of medical information related with digestive system malignancy retrieved from Wikipedia and Baidu Encyclopedia. Comparison was made between the 2 encyclopedias. We conducted a 3-year follow-up to find out if the quality and timeliness of articles improved. METHODS We conducted a search based on International Statistical Classification of Diseases and Related Health Problems 10th Revision Version 2016 codes in Wikipedia and Baidu Encyclopedia, and evaluated articles related to digestive system malignancy by using the DISCERN instrument. We calculated the update interval of the webpages to evaluate the update timeliness of these websites. RESULTS In 2017 and 2020, we searched out a total of 50 and 52 articles from Baidu Encyclopedia, with 2 articles increased and no article missed. 30 and 32 articles were found in Wikipedia, with 1 article increased and no article missed. According to the scores evaluated by DISCERN instrument. In both 2017 and 2020, Wikipedia scored higher than Baidu Encyclopedia in section1 and section2, and it's statistically significant. Wikipedia scored higher than Baidu Encyclopedia in Section3, but it's not statistically significant. The total score of Wikipedia was higher than Baidu Encyclopedia, and the difference was statistically significant. The update interval of Wikipedia is shorter than that of Baidu Encyclopedia, with better timeliness and statistical significance. CONCLUSIONS The quality and timeliness of digestive system malignancy relative articles on Wikipedia are better than those on Baidu Encyclopedia. Both Baidu Encyclopedia and Wikipedia articles have improved in quality over the past three years. However, the treatment information obtained from the Internet still can’t guarantee its comprehensiveness or reliability. Patients should consult a medical professional directly.

Learning landslide hazard in a virtual environment at University level combining real case study, collaborative work and innovative tools

2021 ◽  
Author(s):  
Marta Guinau ◽  
Gloria Furdada
Keyword(s):  
Digital Media ◽  
Collaborative Work ◽  
Relevant Information ◽  
Landslide Hazard ◽  
Mitigation Strategies ◽  
Significant Information ◽  
Digital Platforms ◽  
Face To Face ◽  
Triggering Factors ◽  
Different Types

<p>The pandemic situation we are experiencing has forced us to transform face-to-face teaching into virtual teaching. Digital platforms hinder the interaction, discussion and feedback that naturally occur in a face-to-face class, but at the same time, they provide an opportunity to put the focus on the student’s learning rather than on content delivering. Learning include both, inductive and deductive processes; induction can be effectively acquired by using case studies; then, deduction can be achieved through comparison, analysis, generalisation and synthesis.  Digital platforms appear as an optimal resource to facilitate the individual and collaborative tasks and learning processes. In this work we present our experience on the landslide hazard subject (Master’s level) focussed on the student’s learning through the use of digital media.</p><p>Internet information of undeniable quality that can be easily accessed is basic: The Landslide Blog by Dave Petley (https://blogs.agu.org/landslideblog/) in Blogosphere hosted by AGU (American Geophysical Union) provides valuable and updated information on landslide events occurring worldwide. The learning activities are structured around several cases selected by the lecturer from the blog to ensure the analysis of the most frequent landslide types. All activities are developed in 8 steps: 1) The teacher presents the learning action (objective, tasks, and assessment guide) using a Genially platform interactive image; 2) Each student selects one of the proposed cases and compile relevant information about it; 3) Each student analyses the landslide characteristics, identifies the landslide type  and classifies it according to Hungr et al., 2014 (available through the educational virtual platform), and recognises the control and triggering factors (one virtual session is programmed and a forum tool is provided to the students to discuss and to solve doubts); 4) Each student selects and organizes the significant information about each case by building an interactive image in Genially; 5) Each student presents each case using his/her interactive image in a virtual session, which is recorded and uploaded to the educational platform; 6) Students peer evaluate the content and design of the interactive images and oral presentations based on the provided assessment guide; 7) During a predetermined time, students collaboratively compile all the information in a Google sheet table to synthesize the geomorphological characteristics, materials involved, mobilization mechanisms and control and triggering factors of the different types of landslides; 8) the synthetic table is discussed and  completed during a virtual session.</p><p>All the knowledge and skills acquired by students with these activities are put into practice in a two-day field trip where students have to identify, characterize and classify different types of landslides as well as their control and triggering factors. The risk situation and the mitigation strategies are discussed in each case and compared to the ones studied through virtual learning. Furthermore, students get used and learn how to clearly present information through virtual tools, as Genially, useful for dissemination purposes.</p><p>Hungr et al. 2014. The Varnes classification of landslide types, an update. Landslides 11(2). DOI: 10.1007/s10346-013-0436-y</p>

Genetic Data, Genome Understanding, and Socially Relevant Information

2021 ◽  
pp. 7-18
Author(s):  
Dara Hallinan
Keyword(s):  
Genetic Analysis ◽  
Genetic Relationships ◽  
Genomic Data ◽  
Genetic Data ◽  
Relevant Information ◽  
Significant Information ◽  
Multiple Factors ◽  
Phenotype Data ◽  
Wide Range ◽  
Socially Relevant

This chapter discusses the range of types of data which might be subject to genetic analysis to produce socially relevant information. These genetic data include raw genomic data as well as other types of data, such as phenotype data and inheritance data. Genetic analysis of these types of data is currently capable of producing a wide range of socially relevant information, including information concerning identity, genetic relationships, phenotype, health, and social and behavioural traits. It is not the case, however, that each type of genetic data can be subject to only one type of genetic analysis to produce only one type of socially relevant information. Rather, each type of genetic data, particularly genomic data, can be subject to multiple types of genetic analysis. Nor is it necessarily the case that genetic analyses produce socially relevant information which is completely accurate. Rather, the degree of accuracy of information will usually depend on multiple factors. The chapter then looks at the range of parties about whom socially significant information may be produced.

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