scholarly journals Test of the Precision and Accuracy of the ShapeAccelArray Sensor

2016 ◽  
Vol 15 (2) ◽  
pp. 43-58 ◽  
Author(s):  
Martin Štroner ◽  
Rudolf Urban ◽  
Jan Balek
Keyword(s):  
Measurement Accuracy ◽  
Absolute Measurement ◽  
High Accuracy ◽  
Point Of View ◽  
Pros And Cons ◽  
Precision And Accuracy

<p>Measurand MEMS ShapeAccelArray sensors are in many ways unique and new equipment, which allows to determine the relative displacements and deformations in other ways than before. The instruments are described, tested and compared with existing instrumentation in a small number of articles, but with exception of one it was not tested from engineering surveying point of view, where the exact precision and accuracy knowledge is a basis for the further use. The result of the experiments is the accuracy of measuring changes by the sensor itself, the pros and cons of its use and some features of its design, which is good to know before using it.</p><p>There were designed and performed practical tests to determine the relative and absolute measurement accuracy of the sensor deformations measurement in all three possible types of use, namely the vertical installation, the horizontal installation and the measurement of convergence.</p><p>The results show high accuracy of the sensor tested, which is under certain conditions even considerably higher than that given by Measurand</p>

Strengthening and widening of steel pony truss bridges

1977 ◽  
Vol 4 (2) ◽  
pp. 214-225
Author(s):  
Baidar Bakht ◽  
Paul F. Csagoly
Keyword(s):  
Traffic Safety ◽  
Carrying Capacity ◽  
Point Of View ◽  
Load Carrying Capacity ◽  
Truss Bridges ◽  
Load Carrying ◽  
Live Loads ◽  
Pros And Cons ◽  
Pony Truss Bridge ◽  
Truss Bridge

There are many thousands of existing pony truss bridges in North America which were constructed in the earlier part of this century and are still serving as important traffic carriers. The present economic situation demands that these bridges should usefully serve their purpose for as long as is safely possible.These bridges could be found inadequate for either or both of the following reasons. With the exception of remote areas, operational traffic safety would require two 12-ft lanes plus adequate shoulders. Many of these old bridges are therefore unsatisfactory from the geometrical point of view. Some bridges were designed for live loads that are only a fraction of present commercial vehicle weights.A computer-oriented method of rigorous analysis of lateral buckling behaviour of pony truss bridges is briefly discussed. The method is implemented through a computer program which has been validated by experimental data. It is expected that the program would predict realistic values of load-carrying capacity of such bridges and would help to avoid many an unnecessary replacement.Various methods of strengthening and widening pony truss bridges, and their pros and cons, are discussed. It is shown that the strengthening of a few components of a pony truss bridge does not always lead to an increase in the load-carrying capacity of the bridge.

scholarly journals High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2842 ◽  
Author(s):  
Wei Liu ◽  
Bing Liang ◽  
Zhenyuan Jia ◽  
Di Feng ◽  
Xintong Jiang ◽  
...  
Keyword(s):  
Eddy Current ◽  
Measurement Accuracy ◽  
Characteristic Curve ◽  
Calibration Method ◽  
High Accuracy ◽  
Output Characteristic ◽  
Displacement Sensor ◽  
Support Vector ◽  
Displacement Sensors ◽  
Calibration Accuracy

High precision position control is essential in the process of parts manufacturing and assembling, where eddy current displacement sensors (ECDSs) are widely used owing to the advantages of non-contact sensing, compact volume, and resistance to harsh conditions. To solve the nonlinear characteristics of the sensors, a high-accuracy calibration method based on linearity adjustment is proposed for ECDSs in this paper, which markedly improves the calibration accuracy and then the measurement accuracy. After matching the displacement value and the output voltage of the sensors, firstly, the sensitivity is adjusted according to the specified output range. Then, the weighted support vector adjustment models with the optimal weight of the zero-scale, mid-scale and full-scale are established respectively to cyclically adjust the linearity of the output characteristic curve. Finally, the final linearity adjustment model is obtained, and both the calibration accuracy and precision are verified by the established calibration system. Experimental results show that the linearity of the output characteristic curve of ECDS adjusted by the calibration method reaches over 99.9%, increasing by 1.9–5.0% more than the one of the original. In addition, the measurement accuracy improves from 11–25 μ m to 1–10 μ m in the range of 6mm, which provides a reliable guarantee for high accuracy displacement measurement.

Anthropological filmmaking: an empirical art

2019 ◽  
pp. 137-156
Author(s):  
David MacDougall
Keyword(s):  
Point Of View ◽  
Single Author ◽  
Pros And Cons ◽  
Film Aesthetics

This chapter provides an overview and guide to the methodology, theory, practice, and ethics of ethnographic filmmaking. Examining in turn the various uses of film in anthropology, the differences between anthropological writing and anthropological films, and the kinds of knowledge produced by each, it proceeds to discuss the practical concerns of the anthropological filmmaker: questions of point-of-view, method, and different approaches to the construction of films. It considers the pros and cons of teamwork and single-author filmmaking, aspects of film aesthetics, relationships with the subjects of films, the filmmaker’s behaviour in the field, and different modes of camera use. Finally, it addresses the different practical strategies possible for this kind of filmmaking, including a focus on individuals as subjects, the uses of narrative, and thematic approaches. Also considered is the filmmaker’s relation to the viewer, and ways of making the filmmaker’s intentions and practice more evident within the film.

Societal Implications of Wearable Technology

2016 ◽  
pp. 238-266
Author(s):  
Katina Michael ◽  
Deniz Gokyer ◽  
Samer Abbas
Keyword(s):  
Wearable Devices ◽  
Point Of View ◽  
Security And Privacy ◽  
Societal Implications ◽  
Wearable Technologies ◽  
Future Developments ◽  
The Social ◽  
Depth Analysis ◽  
Pros And Cons ◽  
The University

This chapter presents a set of scenarios involving the GoPro wearable Point of View (PoV) camera. The scenarios are meant to stimulate discussion about acceptable usage contexts with a focus on security and privacy. The chapter provides a wide array of examples of how overt wearable technologies are perceived and how they might/might not be welcomed into society. While the scenario is based at the University of Wollongong campus in Australia, the main implications derived from the fictitious events are useful in drawing out the predicted pros and cons of the technology. The scenarios are interpreted and the main thematic issues are drawn out and discussed. An in depth analysis takes place around the social implications, the moral and ethical problems associated with such technology, and possible future developments with respect to wearable devices.

FOREIGN TRADE IN FOREST PRODUCTS FROM A POINT OF VIEW OF AN EXPORTING COUNTRY—CANADA

1962 ◽  
Vol 38 (1) ◽  
pp. 56-62
Author(s):  
Harold M. Babcock
Keyword(s):  
Political Influence ◽  
Forest Products ◽  
Forest Growth ◽  
Point Of View ◽  
Economic Diversification ◽  
Traditional Markets ◽  
Forest Policies ◽  
Pros And Cons ◽  
Significant Measure ◽  
Scattered Population

Although Canada has been blessed with an abundant store house of natural resources and enjoys a significant measure of economic and political influence throughout the world, she has a relatively small and widely scattered population. The Canadian economy is largely based on resource industries of which those producing forest products are outstanding, and the very economic existence of Canada is dependent upon her ability to export goods and services.Some of the more critical export problem areas include non-resident ownership, the wage-cost spiral, the loss of traditional markets in forest products and finally the problems associated with researching markets in foreign countries.A matter of concern to many is the lack of investment in Canada's forests although the forest resource is capable of sustaining several times present production. Most disturbed lands regenerate naturally, but not necessarily in the desired species. The questions to be asked by management foresters are: (1) should we concentrate on the production of wood fibre or, (2) should we stress the growing of known species of superior quality? The pros and cons of each of these widely divergent forest policies are easily argued.Lack of an internal market is incurable over the short term; but Canada's immigration policies, her participation in trade conferences, agreements and international organizations, and her attempts at economic diversification all help to alleviate problems associated with her dependency on foreign markets.The results of these actions coupled with a trend toward equalization between forest growth and utilization will provide the necessity and incentive for a stepped up forest investment program in Canada.

Management of Multimedia Semantics Using MPEG-7

2011 ◽  
pp. 182-192
Author(s):  
Uma Srinivasan ◽  
Ajay Divakaran
Keyword(s):  
Multimedia Applications ◽  
Point Of View ◽  
Multimedia Content ◽  
Content Description ◽  
Multimedia Semantics ◽  
Pros And Cons ◽  
Content Semantics

This chapter presents the ISO/IEC MPEG-7 Multimedia Content description Interface Standard from the point of view of managing semantics in the context of multimedia applications. We describe the organisation and structure of the MPEG-7 Multimedia Description schemes which are metadata structures for describing and annotating multimedia content at several levels of granularity and abstraction. As we look at MPEG-7 semantic descriptions, we realise they provide a rich framework for static descriptions of content semantics. As content semantics evolves with interaction, the human user will have to compensate for the absence of detailed semantics that cannot be specified in advance. We explore the practical aspects of using these descriptions in the context of different applications and present some pros and cons from the point of view of managing multimedia semantics.

scholarly journals Ups and Downs of Water Photodecolorization by Nanocomposite Polymer Nanofibers

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 250 ◽  
Author(s):  
Shahin Homaeigohar ◽  
Niharika Krishna Botcha ◽  
Eman. S. Zarie ◽  
Mady Elbahri
Keyword(s):  
Structural Properties ◽  
Thermomechanical Properties ◽  
Second Order ◽  
Point Of View ◽  
Order Kinetic ◽  
Dye Molecules ◽  
Nanocomposite Polymer ◽  
Nanocomposite System ◽  
Order Kinetic Model ◽  
Pros And Cons

Given the exponentially expanding water pollution causing water scarcity, there is an urgent need for operative nanotechnological systems that can purify water, with insignificant energy consumption, and rapidly. Here, we introduce a nanocomposite system based on TiO2 nanoparticles (NPs) and PES nanofibers (NFs) that can adsorb and then photodecompose organic water pollutants such as dye molecules. We evaluate pros and cons of this system with respect to its purification efficiency and structural properties that can be impacted by the photocatalytic activity of the nanofillers. While the material is superhydrophilic and able to remove 95% methylene blue (MB) from water via adsorption/photodecomposition, its thermomechanical properties decline upon UV irradiation. However, these properties still remain at the level of the neat NFs. The removal behavior is modeled by the first- and second-order kinetic models from the kinetic point of view. The nanocomposite NFs’ removal behavior complies much better with the second-order kinetic model. Overall, such feedbacks implied that the nanocomposite can be effectively applied for water treatment and the structural properties are still as reliable as those of the neat counterpart.

scholarly journals Influence of measuring force on CMM accuracy

2018 ◽  
Vol 208 ◽  
pp. 03004
Author(s):  
Bin Wang
Keyword(s):  
Cross Sections ◽  
Measurement Accuracy ◽  
Coordinate Measuring Machine ◽  
Point Of View ◽  
Signal Acquisition ◽  
Force Model ◽  
Thin Part ◽  
Measuring Machine ◽  
The Relationship ◽  
Measuring Force

The measuring accuracy of CMM (Coordinate Measuring Machine) is influenced by many factors, such as temperature, humidity, measuring force and method of signal acquisition. For thin parts, the influence of measuring force is especially obvious. In this paper, the relationship between measuring force and measurement accuracy is studied for a thin part with a U-shaped cross-section. By analyzing the structure of the probe and establishing the force model, the influencing factors of the accuracy of CMM are obtained, and the influence of the contact deformation and the bending deformation on the measurement accuracy is analyzed from the point of view of material mechanics. At the same time, the measurement accuracy of different measuring cross-sections is analyzed. Through the research of this paper, the relationship between measuring force and CMM is established, and an effective method to improve the accuracy of CMM is also found.

Analysis of Underground Space Azimuth Measuring and Data Processing in a Tunnel

2014 ◽  
Vol 580-583 ◽  
pp. 2828-2832
Author(s):  
Tao Wang ◽  
Hu Rong Duan ◽  
Liu Tao Jiang ◽  
Shun Liu
Keyword(s):  
Measurement Error ◽  
Data Processing ◽  
Measurement Accuracy ◽  
High Accuracy ◽  
Measurement Precision ◽  
Underground Space ◽  
Processing Theory ◽  
Constant Measurement ◽  
Survey Results ◽  
Final Orientation

In this paper, we studied high accuracy azimuth measuring on improving the precision of traverse azimuth from the perspective of transfixion measurement error in a tunnel project. On the basis of a feasible scheme using Gyro Total Station measurement is given. Data processing theory and method are also introduced with a successful tunnel transfixion case. The transfixion results show that the instrument constant measurement precision is 3.7", baseline coordinates azimuth measurement accuracy is 4.8" into tunnel, the final orientation coordinate azimuth value and traverse measurement values differ is 11", to guide the construction of the gyro orientation with survey results achieved tunnel through smoothly.

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