Characterization of the Wave Profile in the Edinburgh Curved Tank

2006 ◽  
Author(s):  
Joa˜o M. B. P. Cruz ◽  
Remy R. C. Pascal ◽  
Jamie R. M. Taylor
Keyword(s):  
Three Dimensional ◽  
Experimental Methodology ◽  
Irregular Wave ◽  
Wave Patterns ◽  
University Of Edinburgh ◽  
Using Data ◽  
The University ◽  
The Waves

A novel wave tank has been in use at the University of Edinburgh since 2003. Its main innovation is in the layout of the absorbing/wave-maker paddles, which are arranged in a 90-degree arc in an attempt to improve the angular spread of the generated three-dimensional sea states, and to minimise cross-tank seiches. This paper reports on current studies that aim to assess the quality of the waves in the tank. Directional regular and irregular wave analysis is conducted using data from two arrays of wave elevation probes. Comparisons with the expected wave patterns are made. Emphasis is given to the description of the experimental methodology. The study should prove particularly relevant in the design of a future circular combined wave and current tank.

scholarly journals Cryomesh™: A New Substrate for Cryo-Electron Microscopy

2010 ◽  
Vol 16 (1) ◽  
pp. 43-53 ◽  
Author(s):  
Craig Yoshioka ◽  
Bridget Carragher ◽  
Clinton S. Potter
Keyword(s):  
Electron Microscopy ◽  
Semiconductor Industry ◽  
Three Dimensional ◽  
Quality Of Data ◽  
Temperature Conductivity ◽  
Cryo Electron Microscopy ◽  
Transmission Electron ◽  
Using Data ◽  
Collection Methods

AbstractHere we evaluate a new grid substrate developed by ProtoChips Inc. (Raleigh, NC) for cryo-transmission electron microscopy. The new grids are fabricated from doped silicon carbide using processes adapted from the semiconductor industry. A major motivating purpose in the development of these grids was to increase the low-temperature conductivity of the substrate, a characteristic that is thought to affect the appearance of beam-induced movement (BIM) in transmission electron microscope (TEM) images of biological specimens. BIM degrades the quality of data and is especially severe when frozen biological specimens are tilted in the microscope. Our results show that this new substrate does indeed have a significant impact on reducing the appearance and severity of beam-induced movement in TEM images of tilted cryo-preserved samples. Furthermore, while we have not been able to ascertain the exact causes underlying the BIM phenomenon, we have evidence that the rigidity and flatness of these grids may play a major role in its reduction. This improvement in the reliability of imaging at tilt has a significant impact on using data collection methods such as random conical tilt or orthogonal tilt reconstruction with cryo-preserved samples. Reduction in BIM also has the potential for improving the resolution of three-dimensional cryo-reconstructions in general.

scholarly journals Slider Bars in Multi-Device Web Surveys

2019 ◽  
pp. 089443931987913
Author(s):  
Angelica M. Maineri ◽  
Ivano Bison ◽  
Ruud Luijkx
Keyword(s):  
Data Collection ◽  
Data Quality ◽  
Initial Position ◽  
Web Survey ◽  
Web Surveys ◽  
Web Based ◽  
Using Data ◽  
The University

This study explores some features of slider bars in the context of a multi-device web survey. Using data collected among the students of the University of Trento in 2015 and 2016 by means of two web surveys ( N = 6,343 and 4,124) including two experiments, we investigated the effect of the initial position of the handle and the presence of numeric labels on answers provided using slider bars. It emerged that the initial position of the handle affected answers and that the number of rounded scores increased with numeric feedback. Smartphone respondents appeared more sensitive to the initial position of the handle but also less affected by the presence of numeric labels resulting in a lower tendency to rounding. Yet, outcomes on anchoring were inconclusive. Overall, no relevant differences have been detected between tablet and PC respondents. Understanding to what extent interactive and engaging tools such as slider bars can be successfully employed in multi-device surveys without affecting data quality is a key challenge for those who want to exploit the potential of web-based and multi-device data collection without undermining the quality of measurement.

Geometry and visual realism of ship models for digital ship bridge simulators

2016 ◽  
Vol 231 (1) ◽  
pp. 329-341
Author(s):  
Jose Miguel Varela ◽  
C. Guedes Soares
Keyword(s):  
Virtual Environments ◽  
Three Dimensional ◽  
Ocean Engineering ◽  
Modelling Techniques ◽  
Marine Technology ◽  
And Performance ◽  
Visual Realism ◽  
The University

This article addresses the main requirements and the process of creating the geometry of ship models that fulfil the highly demanding request for realism and performance of the virtual environments currently used in modern ship bridge simulators. It starts with a classification of the ships based on their role in the simulation and on the type of simulator used, and defines the main characteristics of the models. It also discusses the importance of a well-defined workflow and its impact on the modelling time and on the quality of the final product. The article provides contributions in the following areas: identification of the main requirements of polygonal models of ships for ship simulators; effective workflow for ship three-dimensional modelling and identification of most suitable modelling techniques for efficient creation of ship models. The study is supported by real examples of three-dimensional modelling of ships with different sizes and characteristics currently used by the ship manoeuvring simulator in the Centre for Marine Technology and Ocean Engineering of the University of Lisbon.

Development of a Japanese Quality of Life Instrument for Older Adults Experiencing Dementia (QLDJ)

2002 ◽  
Vol 55 (1) ◽  
pp. 71-95 ◽  
Author(s):  
Noriko Yamamoto-Mitani ◽  
Toshiko Abe ◽  
Yuko Okita ◽  
Kunihiko Hayashi ◽  
Chieko Sugishita ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Older Adults ◽  
Three Dimensional ◽  
Reliability And Validity ◽  
Negative Behaviors ◽  
Formal Caregivers ◽  
Life Instrument ◽  
Initial Item ◽  
Using Data

This study develops a quality of life instrument for older Japanese people experiencing dementia (QLDJ). Quality of life (QL) for these older adults is defined as a three dimensional construct including 1) interacting with surroundings, 2) expressing self, and 3) experiencing minimum negative behaviors. From 53 items in the initial item pool, 24 were selected based on item reliability and validity using data from 3 studies that involve ten dementia-care experts (Study A) and 36 and 623 older persons and their formal caregivers in various care settings (Study B & C). Factor analysis of these items identified three domains that correspond to the conceptual definition of QL for older adults with dementia. The domain and total QL scores were calculated considering the relative weights of each item. Resultant domain and total scores of the QLDJ showed satisfactory reliability and evidence of validity.

scholarly journals Optimasi Algoritma Naive Bayes Menggunakan Metode Cross Validation Untuk Meningkatkan Akurasi Prediksi Tingkat Kelulusan Tepat Waktu

2018 ◽  
Vol 1 (2) ◽  
pp. 56-63
Author(s):  
Yohakim Benedictus Samponu ◽  
Kusrini Kusrini
Keyword(s):  
Cross Validation ◽  
Naive Bayes ◽  
Positive Impact ◽  
Naïve Bayes ◽  
Conducting Research ◽  
Using Data ◽  
The University ◽  
Validation Testing

Education at this time is an important requirement in facing the demands of an increasingly advanced era in technolo-gy. To compensate this, the existing educational standards in universities must also be improved, this is a bit much affect the pattern of teaching from universities that produce qualified graduates who can compete in the world of work later and indirectly give a positive impact on the university itself. Qualified graduates are of course not only depending on the role of a university but also majors and quality of education as long as students are still in high school / vocational school also plays an important role. Results of the on-time graduation rate prediction research can be used as an information to im-prove the quality and optimization of the education system but it requires a maximum degree of accuracy. This research predicts on time graduation rates by conducting analysis using data mining classification techniques. Naïve Bayes algo-rithm that are used for this research will be discussed as a reference in conducting research. The author performs a series of different experimental scenarios / cross validation to perform comparisons that can give a difference in the level of ac-curacy gained from this research. The results of this research indicate that with the addition of Cross Validation testing scenario there is an increase of 2% accuracy of the test.

Data resampling: An approach for improving characterization of complex dynamics from noisy interspike intervals

2018 ◽  
Vol 32 (30) ◽  
pp. 1850335
Author(s):  
Olga N. Pavlova ◽  
Alexey N. Pavlov
Keyword(s):  
Point Processes ◽  
Complex Dynamics ◽  
Factors Affecting ◽  
Single Firing ◽  
Stable Estimation ◽  
Computational Errors ◽  
Takens Theorem ◽  
Using Data

Extracting dynamics from point processes produced by different models describing spiking phenomena depends on several factors affecting the quality of reconstruction of nonuniformly sampled dynamical systems. Although its ability is verified by embedding theorems analogous to the Takens theorem for uniformly sampled time series, a limited amount of samples, a low firing rate and the presence of noise can provide significant computational errors and incorrect characterization of the analyzed oscillatory regimes. Here, we discuss how to improve the accuracy of the quantitative evaluation of complex oscillations from point processes using data resampling. This approach provides a more stable estimation of Lyapunov exponents for noisy datasets. The advantages of resampling-based reconstruction are confirmed by the analysis of various spiking mechanisms, including the generation of single firing events and chaotic bursts.

Geoelectrical Characterization of the Al-Kawamil New Settlement, Sohag, Egypt

2019 ◽  
Vol 24 (2) ◽  
pp. 327-332
Author(s):  
Mohammed A. Mohammed ◽  
Abdelbaset M. Abudeif
Keyword(s):  
Electrical Resistivity ◽  
Geophysical Methods ◽  
Three Dimensional ◽  
Site Investigation ◽  
University Campus ◽  
Clayey Sand ◽  
Near Surface ◽  
Drilling Site ◽  
The University

Electrical resistivity tomography (ERT) is one of the most effective geophysical methods used to acquire detailed pictures of subsurface conditions without drilling. Site investigation using two- and three-dimensional electrical resistivity imaging is now a fundamental step before the design and construction of campus buildings at the University of Sohag in Egypt. In this study, an ERT survey was implemented at two pre-defined sites with the aim of selecting the most favorable location for construction of a new educational building on the university campus. The resistivity results were confirmed with boreholes drilled at both sites. RES2DINV and RES3DINV software were used for data processing and interpretation. The results show that the near surface sedimentary succession beneath both sites consists of four geoelectrical and lithological units. From the surface to a depth of 20 m, these layers are: unit 1) unconsolidated boulders and gravels intercalated with percentages of sand and reddish clay; unit 2) fine crushed calcareous gravels and sands with clays intercalations; unit 3) dry sand and clayey sand; and unit 4) shale, at the base. According to an evaluation of the presence and abundance of shale and sand contents cracks, fissures and faults, the second site is identified as more suitable for construction.

scholarly journals Characterization of Darai Limestone Composition and Porosity Using Data-Constrained Modeling and Comparison with Xenon K-Edge Subtraction Imaging

2015 ◽  
Vol 21 (4) ◽  
pp. 961-968 ◽  
Author(s):  
Sheridan C. Mayo ◽  
Sam Y.S. Yang ◽  
Marina Pervukhina ◽  
Michael B. Clennell ◽  
Lionel Esteban ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Micro Computed Tomography ◽  
Mineral Phases ◽  
Limestone Sample ◽  
Computed Tomography Scans ◽  
Sample Characterization ◽  
Dimensional Distribution ◽  
Using Data ◽  
Porosity Measurements

AbstractData-constrained modeling is a method that enables three-dimensional distribution of mineral phases and porosity in a sample to be modeled based on micro-computed tomography scans acquired at different X-ray energies. Here we describe an alternative method for measuring porosity, synchrotron K-edge subtraction using xenon gas as a contrast agent. Results from both methods applied to the same Darai limestone sample are compared. Reasonable agreement between the two methods and with other porosity measurements is obtained. The possibility of a combination of data-constrained modeling and K-edge subtraction methods for more accurate sample characterization is discussed.

Assessment of the quality of the ozone measurements from the Odin/SMR instrument using data assimilation

2007 ◽  
Vol 85 (11) ◽  
pp. 1209-1223 ◽  
Author(s):  
S Massart ◽  
A Piacentini ◽  
D Cariolle ◽  
L El Amraoui ◽  
N Semane
Keyword(s):  
Data Assimilation ◽  
Transport Model ◽  
Three Dimensional ◽  
The Other ◽  
Measuring Instruments ◽  
Atmospheric Measurements ◽  
Data Set ◽  
Ozone Data ◽  
Using Data

Space-based remote-sensing instruments providing atmospheric measurements have different time and space resolutions, and coverage. This makes the direct comparison of the measurements very difficult. Data assimilation has proven to be a far more powerful tool than simple interpolation techniques to create three-dimensional analyzed fields for a given data set. In this paper, we describe how the assimilation of ozone data from the Odin/SMR instrument can be used to assess its precisions and biases against other ozone-measuring instruments. To assess the quality of Odin/SMR ozone retrievals by MOLIERE-5 against ozonesondes, Envisat/MIPAS, Earth Probe/TOMS, and UARS/HALOE data, we use a three-dimensional variational assimilation scheme applied to the Météo-France MOCAGE chemistry transport model. The MOCAGE-PALM assimilation system has been already used by Météo-France and CERFACS to analyse the Envisat/MIPAS data for the ASSET intercomparison exercise. We have further developed and calibrated the configuration of this system to better account for the Odin/SMR ozone profiles. The upgraded system is used to assimilate the Odin/SMR ozone during the August 2003 – November 2003 period and intercomparisons are made with the other ozone measuring techniques. The Odin/SMR analysis and the other ozone data sets are in good agreement at mid and high latitudes, while in the lower tropical stratosphere, we found a positive bias of the Odin/SMR, Envisat/MIPAS, and Earth Probe/TOMS data compared to measurements from UARS/HALOE and ozonesondes. The precision of Odin/SMR ozone retrievals in terms of standard deviation is about 20% in the tropics, below 10% at high southern latitudes, and below 5% at high northern latitudes. PACS No.: 82.33.Tb

scholarly journals Studijų kokybės įtaka aukštųjų mokyklų įvaizdžiui

2009 ◽  
Vol 48 ◽  
pp. 68-81
Author(s):  
Birutė Galinienė ◽  
Algirdas Miškinis ◽  
Albinas Marčinskas ◽  
Greta Drūteikienė
Keyword(s):  
Higher Education ◽  
Education Institution ◽  
University Education ◽  
Education Quality ◽  
Study Quality ◽  
Higher Education Institution ◽  
Vilnius University ◽  
Using Data ◽  
The University

Europos aukštojo mokslo erdvės kūrimas skatina šio kontinento aukštąsias mokyklas susimąstyti apie aukštojo mokslo konkurencingumo ir jo vertės didinimą. Tai pasiekti Lietuvos aukštosios mokyklos gali tik nuolat gerindamos studijų kokybę,savo įvaizdį ir reputaciją. Šiame straipsnyje aptariamos bendrosios studijų kokybės ir įvaizdžio gerinimo aukštosiose mokyklose teorinės prielaidos, jas iliustruojant tyrimų, kurie buvo atlikti visame Vilniaus universitete ir atskirai Ekonomikosfakultete, duomenimis. Visuose Vilniaus universiteto padaliniuose 2005–2006 m. atlikome keturis didelio masto tyrimus (įvertinome vidinį Vilniaus universiteto įvaizdį, studentų požiūrį į studijų kokybę, pradedančiųjų studijuoti Universitete ir jų tėvų lūkesčius, tų lūkesčių pokyčius po pirmojo studijų pusmečio) ir identifikavome pagrindines problemines sritis. Siekdami nustatyti šių problemų priežastis, mėginome pažvelgti dar giliau – atlikome tyrimą viename Vilniaus universiteto padalinyje (Ekonomikos fakultete), kuriuo aiškinomės, kokie veiksniai daro įtaką aukštosios mokyklos įvaizdžiui ir kaip Universiteto įvaizdis siejasi su siūlomų studijų kokybe.Reikšminiai žodžiai: studijų kokybė, įvaizdis, aukštoji mokykla.The impact of study quality on the image of a higher education institutionBirutė Galinienė, Algirdas Miškinis, Albinas Marčinskas, Greta Drūteikienė SummaryIssues concerning the image and reputation strengthening of higher education institutions have recently been given an important consideration in Lithuania and other European countries. In the article we will discuss the fundamentals of the university education quality and image strengthening in theoretical premises, and illustrate them using data of studies performed at the Vilnius University. The research results demonstrate that the quality of studies is the main factor in determining the image of a higher education institution. Key words: study quality, image, higher education institution.

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