Contactless Fault Detection of a DC Motor Direction of Rotation Using Its Stray Magnetic Field

In large-scale manufacturing and assembly applications, especially when trying to automate most steps, implementing quality control as early in the process as possible is the key to prevent expenses later. We deal mainly with the production of DC motor powered fuel pumps, which are commonly used in the automotive industry. The goal of this paper is to present a newly developed technique for non-invasive fault detection of a DC motor’s direction of rotation using a stray magnetic field out of the motor chassis. The results presented in this paper show that it is possible to detect faults even on low-power motors while the algorithm is kept as simple as possible to allow for large-scale deployment on a production line. It also gives new insight into the behavior of the stray magnetic field of electric motors, which may benefit other applications and future research.

Download Full-text

Mean-Field Magnetohydrodynamics as a Basis of Solar Dynamo Theory

Symposium - International Astronomical Union ◽

10.1017/s0074180900008287 ◽

1976 ◽

Vol 71 ◽

pp. 323-344 ◽

Cited By ~ 4

Author(s):

K.-H. Rädler

Keyword(s):

Magnetic Field ◽

Large Scale ◽

Mean Field ◽

Strong Relationship ◽

Solar Radius ◽

Small Scale ◽

Dynamo Theory ◽

The Magnetic Field ◽

Complicated Situation ◽

Insight Into

One of the most striking features of both the magnetic field and the motions observed at the Sun is their highly irregular or random character which indicates the presence of rather complicated magnetohydrodynamic processes. Of great importance in this context is a comprehension of the behaviour of the large scale components of the magnetic field; large scales are understood here as length scales in the order of the solar radius and time scales of a few years. Since there is a strong relationship between these components and the solar 22-years cycle, an insight into the mechanism controlling these components also provides for an insight into the mechanism of the cycle. The large scale components of the magnetic field are determined not only by their interaction with the large scale components of motion. On the contrary, a very important part is played also by an interaction between the large and the small scale components of magnetic field and motion so that a very complicated situation has to be considered.

Download Full-text

A Survey on Distributed Filtering and Fault Detection for Sensor Networks

Mathematical Problems in Engineering ◽

10.1155/2014/858624 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 20

Author(s):

Hongli Dong ◽

Zidong Wang ◽

Steven X. Ding ◽

Huijun Gao

Keyword(s):

Sensor Networks ◽

Fault Detection ◽

Large Scale ◽

Future Research ◽

Information Structures ◽

Distributed Information ◽

Practical Research ◽

And Mathematics ◽

Faulty Sensors ◽

Core Part

In recent years, theoretical and practical research on large-scale networked systems has gained an increasing attention from multiple disciplines including engineering, computer science, and mathematics. Lying in the core part of the area are the distributed estimation and fault detection problems that have recently been attracting growing research interests. In particular, an urgent need has arisen to understand the effects of distributed information structures on filtering and fault detection in sensor networks. In this paper, a bibliographical review is provided on distributed filtering and fault detection problems over sensor networks. The algorithms employed to study the distributed filtering and detection problems are categorised and then discussed. In addition, some recent advances on distributed detection problems for faulty sensors and fault events are also summarized in great detail. Finally, we conclude the paper by outlining future research challenges for distributed filtering and fault detection for sensor networks.

Download Full-text

The nature of comets

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences ◽

10.1098/rsta.1987.0097 ◽

1987 ◽

Vol 323 (1572) ◽

pp. 437-446 ◽

Cited By ~ 2

Keyword(s):

Magnetic Field ◽

Solar Wind ◽

Large Scale ◽

Future Research ◽

Head Region ◽

Scientific Curiosity ◽

Halley's Comet ◽

First Results ◽

Cometary Material ◽

Field Lines

The vast scientific campaign associated with the 1986 return of Halley’s Comet has greatly improved and expanded our knowledge of comets. An overview of the first results is presented here with emphasis on the large-scale structure, the chemistry, and the nucleus. Biermann and Alfven’s basic large-scale picture involving the interaction with the solar wind was confirmed. The interaction extends over very large distances and involves the draping of magnetic field lines from the solar wind around the head region. The near-nuclear region is essentially free of magnetic field. The cometary environment is a rich plasma physics laboratory as well as the site of spectacular disconnection events. As Whipple proposed, the chemical composition of the nucleus is largely water, and the breakup of the water molecule produces the large hydrogen-cloud surrounding the comet. Minor constituents with high molecular mass have been observed in the comet. The composition of the dust generally resembles carbonaceous chondrites enriched in the elements H, C, N and O. The interest in the cometary chemistry stems from the belief that cometary material is probably the best remnant of the solar nebula’s original composition. The nucleus is monolithic, as predicted by Whipple’s icy-conglomerate model. Far from spherical, the nucleus is irregular and peanut- or potato-shaped. The surface is very dark, and the emission of gas and dust occurs in jets on the sunward side. Irregular erosion of the surface, which is covered by a dust crust, could lead to many interesting possibilities for outbursts or splitting. Even with our current enhancement of knowledge, comets will continue to excite scientific curiosity. Future research on comets should be very fruitful.

Download Full-text

The Scheldt Valley Commercial Activity Zone: 350 Hectares of the Gallo-Roman Landscape

Britannia ◽

10.3815/006811309789785774 ◽

2009 ◽

Vol 40 ◽

pp. 41-64 ◽

Cited By ~ 3

Author(s):

Raphaël Clotuche

Keyword(s):

Land Use ◽

Material Culture ◽

Large Scale ◽

Future Research ◽

Agricultural System ◽

Commercial Activity ◽

Activity Zone ◽

Insight Into ◽

Point Of Reference ◽

Indigenous Land

ABSTRACTThe research undertaken on the Scheldt Valley Commercial Activity Zone was the frst large-scale excavation in the Valenciennes region (northern France), permitting an insight into the organization of a large territory. It has yielded a great wealth of data on land use and settlement and it forms a key point of reference for any future research within the region for each of the studied periods. The article discusses the characteristics of the occupation of the territory, allowing the development of new models for the occupation, structure, and management of the land and the institution of settlements and their related material culture. It argues for a Roman-indigenous land cadaster, until now not observed for this part of Roman France. The different enclosures and their internal organization are described (buildings, wells, ponds, an artisanal zone, a road system, and a burial zone), showing the persistence of numerous protohistoric sites into Roman times, which is explained by the continuity of the agricultural system and a voluntary integration into a Roman administration. The Onnaing-Scheldt Valley demonstrates the importance of large-scale excavations for the understanding of land use.

Download Full-text

The Sun's global magnetic field

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2011.0536 ◽

2012 ◽

Vol 370 (1970) ◽

pp. 3151-3168 ◽

Cited By ~ 3

Author(s):

Duncan H. Mackay

Keyword(s):

Magnetic Field ◽

Magnetic Fields ◽

Large Scale ◽

Future Research ◽

Flux Transport ◽

Solar Filaments ◽

Recent Developments ◽

Global Magnetic Field ◽

Open Flux ◽

Stellar Magnetic Fields

Our present-day understanding of solar and stellar magnetic fields is discussed from both an observational and theoretical viewpoint. To begin with, observations of the Sun's large-scale magnetic field are described, along with recent advances in measuring the spatial distribution of magnetic fields on other stars. Following this, magnetic flux transport models used to simulate photospheric magnetic fields and the wide variety of techniques used to deduce global coronal magnetic fields are considered. The application and comparison of these models to the Sun's open flux, hemispheric pattern of solar filaments and coronal mass ejections are then discussed. Finally, recent developments in the construction of steady-state global magnetohydrodynamic models are considered, along with key areas of future research.

Download Full-text

A study of women in top business roles: the case of the wine industry

International Journal of Wine Business Research ◽

10.1108/ijwbr-10-2014-0045 ◽

2015 ◽

Vol 27 (2) ◽

pp. 143-158 ◽

Cited By ~ 5

Author(s):

Jeremy Galbreath

Keyword(s):

Large Scale ◽

Population Sample ◽

Wine Industry ◽

Future Research ◽

Policy Makers ◽

Content Type ◽

Representation Of Women ◽

Practical Implications ◽

Insight Into ◽

Study Offer

Purpose – The purpose of this paper is to empirically explore the extent to which women are advancing in the wine industry, and whether there are conditions which help facilitate their advancement. There is a perception that women are making great strides in the wine industry. However, this perception is largely anecdotal. Design/methodology/approach – All wineries in Australia are examined in each year for the years 2007 to 2013. By relying on a leading wine industry database, women in CEO, winemaker, viticulturist and marketing roles are examined. Findings – With the exception of the marketing role, women are under-represented relative to predicted representation rates. Regarding regional differences, there is no consistent pattern with respect to where women representation in the roles is higher. The findings also suggest that where there is a woman CEO, women are more likely to be represented in winemaker, viticulturist and marketing roles. Research limitations/implications – The study represents Australian wine regions and should not be taken as a general population sample. The representation rates of women in top roles in other wine firms around the world may vary, which could lead to results different than those found in this study. Practical implications – For firms and policy makers interested in increasing the representation rates of women in the wine industry, the results of this study offer some insight into where current rates stand, and what might be underlying these representation rates. This is expected to facilitate debate around the means and mechanisms through which to increase the representation of women in the wine industry. Originality/value – This is the first known large-scale study to examine the representation rates of women in top roles in the wine industry; therefore, it offers both new insights and avenues for future research.

Download Full-text

Inter-Turn Short-Circuit Fault Detection Approach for Permanent Magnet Synchronous Machines Through Stray Magnetic Field Sensing

IEEE Sensors Journal ◽

10.1109/jsen.2019.2918018 ◽

2019 ◽

Vol 19 (18) ◽

pp. 7884-7895 ◽

Cited By ~ 6

Author(s):

Xuyang Liu ◽

Wenchao Miao ◽

Qi Xu ◽

Libing Cao ◽

Chunhua Liu ◽

...

Keyword(s):

Magnetic Field ◽

Fault Detection ◽

Permanent Magnet ◽

Short Circuit ◽

Synchronous Machines ◽

Permanent Magnet Synchronous Machines ◽

Stray Magnetic Field ◽

Detection Approach ◽

Field Sensing ◽

Short Circuit Fault

Download Full-text

Influence of Human Activities on Broad-Scale Estuarine-Marine Habitats Using Omics-Based Approaches Applied to Marine Sediments

Microorganisms ◽

10.3390/microorganisms7100419 ◽

2019 ◽

Vol 7 (10) ◽

pp. 419 ◽

Cited By ~ 3

Author(s):

Shah ◽

Crosswell ◽

Metcalfe ◽

Carlin ◽

Morrison ◽

...

Keyword(s):

Marine Sediments ◽

Human Activities ◽

Large Scale ◽

Urban Expansion ◽

Nitrite Reduction ◽

Future Research ◽

Rrna Gene ◽

Marine Habitats ◽

Degrading Bacteria ◽

Insight Into

Rapid urban expansion and increased human activities have led to the progressive deterioration of many marine ecosystems. The diverse microbial communities that inhabit these ecosystems are believed to influence large-scale geochemical processes and, as such, analyzing their composition and functional metabolism can be a means to assessing an ecosystem’s resilience to physical and chemical perturbations, or at the very least provide baseline information and insight into future research needs. Here we show the utilization of organic and inorganic contaminant screening coupled with metabolomics and bacterial 16S rRNA gene sequencing to assess the microbial community structure of marine sediments and their functional metabolic output. The sediments collected from Moreton Bay (Queensland, Australia) contained low levels of organic and inorganic contaminants, typically below guideline levels. The sequencing dataset suggest that sulfur and nitrite reduction, dehalogenation, ammonia oxidation, and xylan degradation were the major metabolic functions. The community metabolites suggest a level of functional homogeneity down the 40-cm core depth sampled, with sediment habitat identified as a significant driver for metabolic differences. The communities present in river and sandy channel samples were found to be the most active, with the river habitats likely to be dominated by photoheterotrophs that utilized carbohydrates, fatty acids and alcohols as well as reduce nitrates to release atmospheric nitrogen and oxidize sulfur. Bioturbated mud habitats showed overlapping faunal activity between riverine and sandy ecosystems. Nitrogen-fixing bacteria and lignin-degrading bacteria were most abundant in the sandy channel and bioturbated mud, respectively. The use of omics-based approaches provide greater insight into the functional metabolism of these impacted habitats, extending beyond discrete monitoring to encompassing whole community profiling that represents true phenotypical outputs. Ongoing omics-based monitoring that focuses on more targeted pathway analyses is recommended in order to quantify the flux changes within these systems and establish variations from these baseline measurements.

Download Full-text