Mismatch Based Diagnosis of PV Fields Relying on Monitored String Currents

This paper presents a DC side oriented diagnostic method for photovoltaic fields which operates on string currents previously supplied by an appropriate monitoring system. The relevance of the work relies on the definition of an effective and reliable day-by-day target for the power that every string of the field should have produced. The procedure is carried out by comparing the instantaneous power produced by all solar strings having the same orientation and by attributing, as producible power for all of them, the maximum value. As figure of merit, the difference between the maximum allowed energy production (evaluated as the integral of the power during a defined time interval) and the energy actually produced by the strings is defined. Such a definition accounts for both weather and irradiance conditions, without needing additional sensors. The reliability of the approach was experimentally verified by analyzing the performance of two medium size solar fields that were monitored over a period of four years. Results allowed quantifying energy losses attributable to underperforming solar strings and precisely locating their position in the field.

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Definition of Probability That Energy Production Differs from Demand, a Statistical Approach

TECNICA ITALIANA-Italian Journal of Engineering Science ◽

10.18280/ti-ijes.652-415 ◽

2021 ◽

Vol 65 (2-4) ◽

pp. 236-241

Author(s):

Federico Rossi ◽

Alberto Maria Gambelli ◽

Andrea Presciutti

Keyword(s):

Energy Demand ◽

Energy Production ◽

Statistical Approach ◽

A Priori ◽

Electricity Grid ◽

True Value ◽

Opposite Trend ◽

Accumulation System ◽

The Difference ◽

Definition Of

Starting from the average trend of energy demand and energy production related to a specific user, the goal is to produce an immediate estimate, as close as possible to the true value (clearly achievable only through a precise and punctual measurement), of the difference existing between these two values, in order to “a priori” understand whether an energy production surplus should be expected, or the opposite trend will occur. If energy produced exceeds the request, two solutions will be possible. An accumulation system can be provided, that allows to avoid taking energy from the grid whenever the trend reserves and the demand exceeds the production. The second solution consists in directly introduce the whole surplus of energy produced in the electricity grid. Similarly, even if the energy required exceeds the amount of energy produced, two different solutions can be envisaged. In both cases, it will be necessary to take energy from the electricity grid. An accumulation system could be created, sized on the maximum difference between production and energy demand, evaluated when the production exceeds the request (if the production never exceeds the request, it would not make sense to talk about accumulation) or, even in this case, a direct exchange might be promoted, both incoming and outgoing, with the electricity grid. Topic of the present paper is to not reasoning any more in terms of energy performances as a function of time but, on the contrary, determine the probability that the difference existing between production and demand assumes a certain value and, based on this, estimate the amount of energy to be stored and/or exchange with the grid.

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The Distinction between [P] and [S]

10.23943/princeton/9780691161006.003.0018 ◽

2017 ◽

Author(s):

Galen Strawson

Keyword(s):

Personal Identity ◽

Radical Change ◽

Legal Responsibility ◽

The Difference ◽

Definition Of ◽

Over Time

This chapter examines the difference between John Locke's definition of a person [P], considered as a kind of thing, and his definition of a subject of experience of a certain sophisticated sort [S]. It first discusses the equation [P] = [S], where [S] is assumed to be a continuing thing that is able to survive radical change of substantial realization, as well as Locke's position about consciousness in relation to [P]'s identity or existence over time as [S]. It argues that Locke is not guilty of circularity because he is not proposing consciousness as the determinant of [S]'s identity over time, but only of [S]'s moral and legal responsibility over time. Finally, it suggests that the terms “Person” and “Personal identity” pull apart, in Locke's scheme of things, but in a perfectly coherent way.

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L'anglicisme dans la langue française

Digital Press Social Sciences and Humanities ◽

10.29037/digitalpress.43286 ◽

2019 ◽

Vol 3 ◽

pp. 00013

Author(s):

Danny Susanto

Keyword(s):

English Language ◽

Oil Industry ◽

English Word ◽

Public Institutions ◽

Font Size ◽

The World ◽

French Speaking ◽

The Difference ◽

Definition Of ◽

Bibliographic Study

The purpose of this study is to analyze the phenomenon known as “anglicism”: a loan made to the English language by another language. Anglicism arose either from the adoption of an English word as a result of a translation defect despite the existence of an equivalent term in the language of the speaker, or from a wrong translation, as a word-by-word translation. Said phenomenon is very common nowadays and most languages of the world including making use of some linguistic concepts such as anglicism, neologism, syntax, morphology etc, this article addresses various aspects related to Anglicisms in French through a bibliographic study: the definition of Anglicism, the origin of Anglicisms in French and the current situation, the areas most affected by Anglicism, the different categories of Anglicism, the difference between French Anglicism in France and French-speaking Canada, the attitude of French-speaking society towards to the Anglicisms and their efforts to stop this phenomenon. The study shows that the areas affected are, among others, trade, travel, parliamentary and judicial institutions, sports, rail, industrial production and most recently film, industrial production, sport, oil industry, information technology, science and technology. Various initiatives have been implemented either by public institutions or by individuals who share concerns about the increasingly felt threat of the omnipresence of Anglicism in everyday life.

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Exploring the Effect of Temporal Aggregation on SCADA Data for Wind Turbine Prognosis Using a Normality Model

Applied Sciences ◽

10.3390/app11146405 ◽

2021 ◽

Vol 11 (14) ◽

pp. 6405

Author(s):

Pere Marti-Puig ◽

Alejandro Bennásar-Sevillá ◽

Alejandro Blanco-M. ◽

Jordi Solé-Casals

Keyword(s):

Wind Turbine ◽

Low Cost ◽

Wind Farms ◽

Temporal Aggregation ◽

Time Interval ◽

Irreversible Loss ◽

Loss Of Information ◽

Statistical Measures ◽

Maximum Value ◽

Additional Equipment

Today, the use of SCADA data for predictive maintenance and forecasting of wind turbines in wind farms is gaining popularity due to the low cost of this solution compared to others that require the installation of additional equipment. SCADA data provides four statistical measures (mean, standard deviation, maximum value, and minimum value) of hundreds of wind turbine magnitudes, usually in a 5-min or 10-min interval. Several studies have analysed the loss of information associated with the reduction of information when using five minutes instead of four seconds as a sampling frequency, or when compressing a time series recorded at 5 min to 10 min, concluding that some, but not all, of these magnitudes are seriously affected. However, to our knowledge, there are no studies on increasing the time interval beyond 10 min to take these four statistical values, and how this aggregation affects prognosis models. Our work shows that, despite the irreversible loss of information that occurs in the first 5 min, increasing the time considered to take the four representative statistical values improves the performance of the predicted targets in normality models.

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A scoping review of chronotype and temporal patterns of eating of adults: Tools used, findings, and future directions

Nutrition Research Reviews ◽

10.1017/s0954422421000123 ◽

2021 ◽

pp. 1-51

Author(s):

Yan Yin Phoi ◽

Michelle Rogers ◽

Maxine P. Bonham ◽

Jillian Dorrian ◽

Alison M. Coates

Keyword(s):

Energy Intake ◽

Scoping Review ◽

Assessment Tool ◽

Temporal Patterns ◽

Time Interval ◽

Dark Cycle ◽

Future Directions ◽

Meal Skipping ◽

Optimal Health ◽

The Difference

Abstract Circadian rhythms, metabolic processes, and dietary intake are inextricably linked. Timing of food intake is a modifiable temporal cue for the circadian system and may be influenced by numerous factors, including individual chronotype—an indicator of an individual’s circadian rhythm in relation to the light-dark cycle. This scoping review examines temporal patterns of eating across chronotypes and assesses tools that have been used to collect data on temporal patterns of eating and chronotype. A systematic search identified thirty-six studies in which aspects of temporal patterns of eating including meal timings; meal skipping; energy distribution across the day; meal frequency; time interval between meals, or meals and wake/sleep times; midpoint of food/energy intake; meal regularity; and duration of eating window were presented in relation to chronotype. Findings indicate that compared to morning chronotypes, evening chronotypes tend to skip meals more frequently, have later mealtimes, and distribute greater energy intake towards later times of the day. More studies should explore the difference in meal regularity and duration of eating window amongst chronotypes. Currently, tools used in collecting data on chronotype and temporal patterns of eating are varied, limiting the direct comparison of findings between studies. Development of a standardised assessment tool will allow future studies to confidently compare findings to inform the development and assessment of guidelines that provide recommendations on temporal patterns of eating for optimal health.

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Two maize cultivars of contrasting leaf size show different leaf elongation rates with identical patterns of extension dynamics and coordination

AoB Plants ◽

10.1093/aobpla/plaa072 ◽

2021 ◽

Author(s):

Tiphaine Vidal ◽

Hafssa Aissaoui ◽

Sabrina Rehali ◽

Bruno Andrieu

Keyword(s):

Genotypic Variation ◽

Leaf Size ◽

High Rate ◽

Time Interval ◽

Extension Rate ◽

Leaf Production ◽

Maize Cultivars ◽

Plant Environment ◽

The Difference ◽

Leaf Extension

Abstract Simulating leaf development from initiation to maturity opens new possibilities to model plant–environment interactions and the plasticity of plant architecture. This study analyses the dynamics of leaf production and extension along a maize (Zea mays) shoot to assess important modelling choices. Maize plants from two cultivars originating from the same inbred line, yet differing in the length of mature leaves were used in this study. We characterised the dynamics of the blade and sheath lengths of all phytomers by dissecting plants every 2–3 days. We analysed how differences in leaf size were built up and we examined the coordination between the emergence of organs and phases of their extension. Leaf extension rates were higher in the cultivar with longer leaves than in the cultivar with shorter leaves; no differences were found in other aspects. We found that (i) first post-embryonic leaves were initiated at a markedly higher rate than upper leaves; (ii) below ear position, sheaths were initiated at a time intermediate between tip emergence and appearance, while above the ear position, sheaths were initiated at a high rate, such that the time interval between the blade and sheath initiations decreased for these leaves; and (iii) ear position also marked a change in the correlation in size between successive phytomers with little correlation of size between upper and lower leaves. Our results identified leaf extension rate as the reason for the difference in size between the two cultivars. The two cultivars shared the same pattern for the timing of initiation events, which was more complex than previously thought. The differences described here may explain some inaccuracies reported in functional-structural plant models. We speculate that genotypic variation in behaviour for leaf and sheath initiation exists, which has been little documented in former studies.

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Identity, Community and Belonging in gcc States

Sociology of Islam ◽

10.1163/22131418-00604004 ◽

2018 ◽

Vol 6 (4) ◽

pp. 401-428

Author(s):

Miriam R. Lowi

Keyword(s):

Religious Affiliation ◽

Protective Role ◽

The Other ◽

National Project ◽

Scholarly Literature ◽

National Community ◽

The Difference ◽

Definition Of

Studies of identity and belonging in Gulf monarchies tend to privilege tribal or religious affiliation, if not the protective role of the ruler as paterfamilias. I focus instead on the ubiquitous foreigner and explore ways in which s/he contributes to the definition of national community in contemporary gcc states. Building upon and moving beyond the scholarly literature on imported labor in the Gulf, I suggest that the different ‘categories’ of foreigners impact identity and the consolidation of a community of privilege, in keeping with the national project of ruling families. Furthermore, I argue that the ‘European,’ the non-gcc Arab, and the predominantly Asian (and increasingly African) laborer play similar, but also distinct roles in the delineation of national community: while they are differentially incorporated in ways that protect the ‘nation’ and appease the citizen-subject, varying degrees of marginality reflect Gulf society’s perceptions or aspirations of the difference between itself and ‘the other(s).’

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Magnetocrystalline Anisotropy and Twinning Stress of 10M and 2M Martensites in Ni-Mn-Ga System

Materials Science Forum ◽

10.4028/www.scientific.net/msf.512.195 ◽

2006 ◽

Vol 512 ◽

pp. 195-200 ◽

Cited By ~ 2

Author(s):

Nariaki Okamoto ◽

Takashi Fukuda ◽

Tomoyuki Kakeshita ◽

Tetsuya Takeuchi

Keyword(s):

Magnetic Field ◽

Shear Stress ◽

Magnetocrystalline Anisotropy ◽

Anisotropy Constant ◽

The Other ◽

Magnetic Shear ◽

Maximum Value ◽

Twinning Plane ◽

Twinning Shear ◽

The Difference

Ni2MnGa alloy with 10M martensite exhibits rearrangement of martensite variants (RMV) by magnetic field, but Ni2.14Mn0.92Ga0.94 with 2M martensite does not. In order to explain the difference, we measured uniaxial magnetocrystalline anisotropy constant Ku and the stress required for twinning plane movement τreq in these alloys. Concerning the former alloy, the maximum value of magnetic shear stress acting across twinning plane τmag, which is evaluated as |Ku| divided by twinning shear, becomes larger than τr eq. On the other hand, concerning the latter alloy, the maximum of τmag is only one-tenth of τreq at any temperature examined. Obviously, the relation, τmag> τr eq, is satisfied when RMV occurs by magnetic field and vice versa. In this martensite, the large twinning shear of 2M martensite is responsible for small τmag and large τreq.

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Charge-Transfer Dipoles at the Si-SiO2 Interface and the Metal-Semiconductor Worfunction Difference In Mos Devices.

MRS Proceedings ◽

10.1557/proc-105-265 ◽

1987 ◽

Vol 105 ◽

Cited By ~ 3

Author(s):

Hisham Z. Massoud

Keyword(s):

Dipole Moment ◽

Charge Transfer ◽

Dipole Moments ◽

Silicon Substrates ◽

Interface Dipole ◽

Mos Devices ◽

Flatband Voltage ◽

The Difference ◽

Definition Of ◽

Mos Structures

AbstractThe magnitude of the dipole moment at the Si-SiO2 interface resulting from partial charge transfer that takes place upon the formation of interface bonds has been calculated. The charge transfer occurs because of the difference in electronegativity between silicon atoms and SiO2 molecules which are present across the interface. Results obtained for (100) and (111) silicon substrates indicate that the magnitude of the interface dipole moment is dependent on substrate orientation and the interface chemistry. Dipole moments at the Si-SiO2 and gate-SiO2 interfaces should be included in the definition of the flatband voltage VFB of MOS structures. CV-based measurements of the metal-semiconductor workfunction difference φms on (100) and (111) silicon oxidized in dry oxygen and metallized with Al agree with the predictions of this model. Other types of interface dipoles and their processing dependence are briefly discussed.

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LONG‐TIME RESPONSE PREDICTED BY EXACT ELASTIC RAY THEORY

Geophysics ◽

10.1190/1.1439584 ◽

1965 ◽

Vol 30 (3) ◽

pp. 363-368 ◽

Cited By ~ 8

Author(s):

T. W. Spencer

Keyword(s):

Formal Solution ◽

Intermediate Stage ◽

Time Limit ◽

Time Interval ◽

Individual Response ◽

Axially Symmetric ◽

Long Time ◽

The Difference ◽

The Individual ◽

Significant Figures

The formal solution for an axially symmetric radiation field in a multilayered, elastic system can be expanded in an infinite series. Each term in the series is associated with a particular raypath. It is shown that in the long‐time limit the individual response functions produced by a step input in particle velocity are given by polynomials in odd powers of the time. For rays which suffer m reflections, the degree of the polynomials is 2m+1. The total response is obtained by summing all rays which contribute in a specified time interval. When the rays are selected indiscriminately, the difference between the magnitude of the partial sum at an intermediate stage of computation and the magnitude of the correct total sum may be greater than the number of significant figures carried by the computer. A prescription is stated for arranging the rays into groups. Each group response function varies linearly in the long‐time limit and goes to zero when convolved with a physically realizable source function.

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