scholarly journals Rotation, Strain, and Translation Sensors Performance Tests with Active Seismic Sources

Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 264
Author(s):  
Felix Bernauer ◽  
Kathrin Behnen ◽  
Joachim Wassermann ◽  
Sven Egdorf ◽  
Heiner Igel ◽  
...  
Keyword(s):  
Strong Motion ◽  
Quality Standard ◽  
Noise Signal ◽  
Performance Comparison ◽  
Motion Sensors ◽  
Geophysical Research ◽  
Waveform Similarity ◽  
Narrow Frequency Range ◽  
High Quality Standard ◽  
High Level

Interest in measuring displacement gradients, such as rotation and strain, is growing in many areas of geophysical research. This results in an urgent demand for reliable and field-deployable instruments measuring these quantities. In order to further establish a high-quality standard for rotation and strain measurements in seismology, we organized a comparative sensor test experiment that took place in November 2019 at the Geophysical Observatory of the Ludwig-Maximilians University Munich in Fürstenfeldbruck, Germany. More than 24 different sensors, including three-component and single-component broadband rotational seismometers, six-component strong-motion sensors and Rotaphone systems, as well as the large ring laser gyroscopes ROMY and a Distributed Acoustic Sensing system, were involved in addition to 14 classical broadband seismometers and a 160 channel, 4.5 Hz geophone chain. The experiment consisted of two parts: during the first part, the sensors were co-located in a huddle test recording self-noise and signals from small, nearby explosions. In a second part, the sensors were distributed into the field in various array configurations recording seismic signals that were generated by small amounts of explosive and a Vibroseis truck. This paper presents details on the experimental setup and a first sensor performance comparison focusing on sensor self-noise, signal-to-noise ratios, and waveform similarities for the rotation rate sensors. Most of the sensors show a high level of coherency and waveform similarity within a narrow frequency range between 10 Hz and 20 Hz for recordings from a nearby explosion signal. Sensor as well as experiment design are critically accessed revealing the great need for reliable reference sensors.

scholarly journals PANCREATODUODENECTOMY: BRAZILIAN PRACTICE PATTERNS

2017 ◽  
Vol 30 (3) ◽  
pp. 190-196 ◽  
Author(s):  
Orlando Jorge M TORRES ◽  
Eduardo de Souza M FERNANDES ◽  
Rodrigo Rodrigues VASQUES ◽  
Fabio Luís WAECHTER ◽  
Paulo Cezar G. AMARAL ◽  
...  
Keyword(s):  
Pancreatic Surgery ◽  
Practice Patterns ◽  
International Study ◽  
Quality Standard ◽  
Somatostatin Analogues ◽  
Whipple Procedure ◽  
High Quality Standard ◽  
High Level ◽  
Level Of Experience ◽  
Complications And Mortality

ABSTRACT Background: Pancreatoduodenectomy is a technically challenging surgical procedure with an incidence of postoperative complications ranging from 30% to 61%. The procedure requires a high level of experience, and to minimize surgery-related complications and mortality, a high-quality standard surgery is imperative. Aim: To understand the Brazilian practice patterns for pancreatoduodenectomy. Method: A questionnaire was designed to obtain an overview of the surgical practice in pancreatic cancer, specific training, and experience in pancreatoduodenectomy. The survey was sent to members who declared an interest in pancreatic surgery. Results: A total of 60 questionnaires were sent, and 52 have returned (86.7%). The Southeast had the most survey respondents, with 25 surgeons (48.0%). Only two surgeons (3.9%) performed more than 50% of their pancreatoduodenectomies by laparoscopy. A classic Whipple procedure was performed by 24 surgeons (46.2%) and a standard International Study Group on Pancreatic Surgery lymphadenectomy by 43 surgeons (82.7%). For reconstruction, pancreaticojejunostomy was performed by 49 surgeons (94.2%), single limb technique by 41(78.9%), duct-to-mucosa anastomosis by 38 (73.1%), internal trans-anastomotic stenting by 26 (50.0%), antecolic route of gastric reconstruction by 39 (75.0%), and Braun enteroenterostomy was performed by only six surgeons (11.5%). Prophylactic abdominal drainage was performed by all surgeons, and somatostatin analogues were utilized by six surgeons (11.5%). Early postoperative enteral nutrition was routine for 22 surgeons (42.3%), and 34 surgeons (65.4%) reported routine use of a nasogastric suction tube. Conclusion: Heterogeneity was observed in the pancreatoduodenectomy practice patterns of surgeons in Brazil, some of them in contrast with established evidence in the literature.

scholarly journals A performance evaluation of despiking algorithms for eddy covariance data

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Domenico Vitale
Keyword(s):  
Eddy Covariance ◽  
Data Center ◽  
High Frequency ◽  
Complex Dynamics ◽  
Simulated Data ◽  
Quality Standard ◽  
High Quality Standard ◽  
High Level ◽  
Essential Prerequisite ◽  
Better Than

AbstractSpike detection for raw high-frequency eddy covariance time series is a challenging task because of the confounding effect caused by complex dynamics and the high level of noise affecting such data. To cope with these features, a new despiking procedure rooted on robust functionals is proposed. By processing simulated data, it is demonstrated that the proposed procedure performs better than the existing algorithms and can be therefore considered as a candidate for the implementation in data center environmental monitoring systems, where the availability of automatic procedures ensuring a high quality standard of released products constitutes an essential prerequisite.

scholarly journals Rotation and Strain Instrument Performance Tests with Active Seismic Sources

2020 ◽  
Author(s):  
Felix Bernauer ◽  
Joachim Wassermann ◽  
Katrin Behnen ◽  
Heiner Igel ◽  
Stefanie Donner ◽  
...  
Keyword(s):  
Quality Standard ◽  
Geophysical Research ◽  
Sensor Performance ◽  
Federal Institute ◽  
University Of Munich ◽  
First Results ◽  
High Quality Standard ◽  
The University ◽  
Mechanical Rotation ◽  
Seismic Rotation

<p>Interest in measuring seismic rotation and strain is growing in many areas of geophysical research. This results in a great need for reliable and field deployable instruments measuring ground rotation and strain. To further establish a high quality standard for rotation and strain measurements in seismology, researchers from the Ludwig-Maximilians University of Munich (LMU), the German Federal Institute for Geosciences and Natural Resources, the University of Potsdam and the ETH Zürich organized a comparative sensor test experiment which took place in November 2019 at the Geophysical Observatory of the LMU in Fürstenfeldbruck, Germany. More than 40 different sensors such as ring-laser and fiber optic gyroscopes, a Distributed Acoustic Sensing (DAS) cable and interrogator, liquid-based as well as mechanical rotation sensors were involved in addition to 12 classical broadband<br>seismometers and a 80 channel, 4Hz geophone chain. The experiment consisted of two parts: during the first part, the sensors were co-located in a huddle test recording self noise and signals from small, nearby explosions. In a second part, the sensors were distributed into the field in various array configurations recording active seismic signals generated by small amounts of explosive and a vibro-seis truck. This contribution presents details on the setup of the experiment and first results on sensor performance characteristics and signal similarities.</p>

scholarly journals Comparative Study of Iran and the UK national curriculum based on the principles of Mind, Brain and Education

2019 ◽  
Vol 8 (1) ◽  
pp. 46
Author(s):  
Nazanin Reza Zadeh Mottaghi ◽  
Mahmoud Talkhabi
Keyword(s):  
Educational System ◽  
Teaching And Learning ◽  
National Curriculum ◽  
Quality Standard ◽  
Thinking Skills ◽  
Reflective Practices ◽  
Science Of Mind ◽  
High Quality Standard ◽  
The Uk ◽  
Collaborative Activities

This study compares the national curriculum of Iran and the UK to find out how the educational system indeveloping countries such as Iran can be improved. Because of implementing thinking skills and cognitive education,the educational system in the UK benefits from a high-quality standard. The science of mind, brain, educationintroduces some principles to improve teaching and learning methods and provide thoughtful and lifelong learnersfor the societies. In this study, we specified the main parts of the national curriculum in both countries and selectedsome of the principles to determine whether these two countries apply them in their national curriculum. Some ofthese principles focus on some significant issues: teaching models, the use of Meta-discipline and HolisticTechniques, authentic learning experiences, use of products, processing and progressing Evaluations, developingexplicit learning objectives, how to benefit from thinking and reflective practices, using collaborative and democraticactivities, preparing students to set personal objectives, giving themselves feedbacks, technology and flippedclassrooms, and beginning Year- Round Schooling. The results show that Iran needs more precise and detailedlearning objectives in its curriculum, use of democratic and collaborative activities with academics and students,develop thinking and reflective practices which play vital roles in upgrading the educational system. Moreover, it issuggested that the UK and Iran should consider embedded evaluations and flipped classrooms to meet the needs ofnew generation of learners.

Preliminary microzonation of the Memphis, Tennessee, area

1982 ◽  
Vol 72 (3) ◽  
pp. 1011-1024
Author(s):  
Sunil Sharma ◽  
William D. Kovacs
Keyword(s):  
United States ◽  
Soil Properties ◽  
Damping Ratio ◽  
Ground Surface ◽  
Strong Motion ◽  
Response Analysis ◽  
Borehole Data ◽  
Central United States ◽  
Hazardous Zone ◽  
High Level

abstract The city of Memphis, which is situated very close to the inferred epicenter of one of the three major 1811 to 1812 earthquakes, is in a potentially hazardous zone which will be susceptible to the usual seismic hazards. By recognizing the high level of seismicity in the New Madrid area, this study attempts to microzone the potential hazards by considering the following subjects: (i) the seismicity of the central United States; (ii) design earthquakes; and (iii) response analysis which allows construction of the necessary microzonation maps. The seismicity of the region is evaluated from state-of-the-art literature as there is no recorded strong-motion data available for the central United States. Synthetically generated accelerograms, simulating the design earthquakes, were used to represent the ground motions which were applied at a depth of 45 m, below ground surface, at numerous sites in Memphis. The soil stratigraphy was conceptualized from borehole data, made available by local sources, and dynamic soil properties estimated from available empirical correlations. The results of the response analysis were transformed into microzonation maps depicting: (i) zones showing qualitative estimates of ground response; (ii) zones showing the natural frequency of the soils; (iii) zones showing the peak spectral acceleration for 2 per cent damping ratio; and (iv) zones of liquefaction potential. These maps are useful for preliminary design and are not intended to be used on a quantitative basis. Further investigation is necessary in determining the stratigraphy and soil properties for a site-specific design and analysis.

scholarly journals Analysis of the Fluctuation of the Number of ISO 9001:2015 Certificates in the Republic of Croatia and Assessment of Satisfaction of Business Organisations Leadership with the Certificate

2020 ◽  
Vol 66 (4) ◽  
pp. 40-49
Author(s):  
Petar Vušković
Keyword(s):  
Global Economy ◽  
Empirical Studies ◽  
Quality Standard ◽  
Iso 9001 ◽  
Annual Fluctuation ◽  
Level Of Satisfaction ◽  
The World ◽  
The Republic ◽  
High Level

AbstractThe ISO 9001:2015 certificate of quality is nowadays the most renowned quality standard in the world. Standardised quality has become an imperative competitive advantage on the market for all serious business organisations. The fluctuation of the number of certificates of quality indicates to what extent companies are willing to ensure the quality of their products and services to customers and clients, and how fast the domestic market is standardised and integrated into the global economy. This paper presents the results of two empirical studies. The first one focused on the analysis of the fluctuation in the number of ISO 9001:2015 certificates in the period from 2008 to 2018, while the second aimed to determine the satisfaction of leadership with the certificate. The study has shown that, during the observed period, the number of certificates of quality in Croatia fluctuated between – 18% and +22% annually. At the annual level, a certain number of companies lose their certificates or opt for decertification. For that reason, a study of the leadership’s level of satisfaction with the ISO 9001:2015 certificate was conducted using a sample of 296 certified business organisations. The study has proven that the leadership showed a high level of satisfaction with the certificate of quality and that they appreciate business organisations with certificates of quality. It demonstrates that the quality management certification has a bright future regardless of the annual fluctuation of the number of certificates.

scholarly journals Optically Transparent Tri-Wideband Mosaic Frequency Selective Surface with Low Cross-Polarisation

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 622
Author(s):  
Nur Biha Mohamed Nafis ◽  
Mohamed Himdi ◽  
Mohamad Kamal A Rahim ◽  
Osman Ayop ◽  
Raimi Dewan
Keyword(s):  
Frequency Selective Surface ◽  
Performance Comparison ◽  
Unit Cell ◽  
Frequency Selective Surfaces ◽  
Transportation Services ◽  
Optically Transparent ◽  
Metallic Element ◽  
Frequency Selective ◽  
High Level ◽  
Polycarbonate Substrate

Acquiring an optically transparent feature on the wideband frequency selective surface (FSS), particularly for smart city applications (building window and transportation services) and vehicle windows, is a challenging task. Hence, this study assessed the performance of optically transparent mosaic frequency selective surfaces (MFSS) with a conductive metallic element unit cell that integrated Koch fractal and double hexagonal loop fabricated on a polycarbonate substrate. The opaque and transparent features of the MFSS were studied. While the study on opaque MFSS revealed the advantage of having wideband responses, the study on transparent MFSS was performed to determine the optical transparency application with wideband feature. To comprehend the MFSS design, the evolutionary influence of the unit cell on the performance of MFSS was investigated and discussed thoroughly in this paper. Both the opaque and transparent MFSS yielded wideband bandstop and bandpass responses with low cross-polarisation (−37 dB), whereas the angular stability was limited to only 25°. The transparent MFSS displayed high-level transparency exceeding 70%. Both the simulated and measured performance comparison exhibited good correlation for both opaque and transparent MFSS. The proposed transparent MFSS with wideband frequency response and low cross-polarisation features signified a promising filtering potential in multiple applications.

scholarly journals A structural analysis in seismic archaeology: the walls of Noto and the 1693 earthquake

1995 ◽  
Vol 38 (5-6) ◽  
Author(s):  
E. Guidoboni ◽  
P. Riva ◽  
V. Petrini ◽  
A. Madini Moretti ◽  
G. Lombardini
Keyword(s):  
Finite Element ◽  
Research Programme ◽  
Historical Earthquakes ◽  
Quality Standard ◽  
Seismic Effects ◽  
Ground Acceleration ◽  
Element Analysis ◽  
Second Development ◽  
High Quality Standard ◽  
The One

A crucial problenl for seismic archeology is how to recognize seismic effects and how to date them. On an experimental basis. we proposed that the problem be reversed, and that we begin at the other end: i.e. by analyzing already known seismic effects on ancient structures, testified by written sources. to be able to .calibrate>> the types or possible observations and any subsequent elaborations. The choice of the walls of Noto was suggested by the fact that Noto was abandoned following the earthquake of l693 (I,= XI MCS. Me 7.5) which had already been studied in depth as part of an ING research programme (1988-92). Moreover, just after recent research, this event proved to be reconstructed with a high quality standard. Photogrammetric measurements were made on several parts of the town walls to plot a numerical model aimed at ascertaining specific aspects of the earthquake damage. An estimate of the ground acceleration during the earthquake has been attempted via non-linear finite-element analyses of a building located by the main city gate. The analyses show that. in order to obtain the building vault collapse, a ground acceleration of 0.5 to 0.7 g had to be reached during the earthquake. This result, typical of a strong earthquake such as the one of 1693, proves that an approach based on finite element analysis and a sound engineering judgment Inay be systematically applied to historical earthquake sites to obtain some estimates of ground acceleration in historical earthquakes. On the whole, this work aimed at starting up the second development phase of the great event of 1693 of which the macroseismic erfects are known. In the meantime, some possibilities of tackling structural analyses in seismic archaeology are being explored.

Mold and Casting Table Maintenance Management System at Aluar: A Key to Quality Billets and Saving Costs

2011 ◽  
Vol 693 ◽  
pp. 208-216
Author(s):  
Leonel S. Batalla ◽  
Oscar A. Godoy ◽  
María Victoria Canullo
Keyword(s):  
Management System ◽  
High Standard ◽  
Relevant Information ◽  
Quality Standard ◽  
Maintenance Management ◽  
Internal Quality ◽  
Casting Technology ◽  
High Quality Standard

It is well known that mold and casting table maintenance has a direct impact on the internal quality and surface quality of billets. In this paper, the evolution of the main key performance indicators (KPIs) associated with the main consumables of the Wagstaff Air slip billet casting technology is shown, such as molds, casting rings, transition plates and thimbles. The strategies taken to preserve a high standard of quality whilst monitoring the associated costs, are discussed. An automated Mold and Casting Table Maintenance Management system has been developed in house to make available the relevant information from the casting table servicing at the casting pit and at the mold room. A case study is described where this tool allowed us to reduce costs, keeping a high quality standard of the casting table maintenance, ensuring the internal quality of the final product.

scholarly journals Performance comparison of high-level algebraic nets distributed simulation protocols

1998 ◽  
Vol 44 (6-7) ◽  
pp. 457-472 ◽  
Author(s):  
K. Djemame ◽  
D.C. Gilles ◽  
L.M. Mackenzie ◽  
M. Bettaz
Keyword(s):  
Distributed Simulation ◽  
Performance Comparison ◽  
High Level
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