394 research outputs found
بههمبافتن سنت و مدرنیته: تار روش سیدحسن تقیزاده و پود تقویم یزدگردی. ("Sewing Tradition and Modernity Together: the Fabric of S. Hasan Taqizadeh’s Method and the Thread of the Yazdegardi Calendar").
No full textHasan Taqizadeh fu uno dei padri fondatori dell'Iran contemporaneo. Attivo costituzionalista liberale, partecipò alla rivoluzione del 1906 e ai lavori di costituzione del Primo Parlamento, nonché alla stesura della Carta Costituzionale e dei decreti attuativi che seguirono. Egli all'attivismo politico affiancava un profondo e variegato interesse di ricerca per alcuni aspetti fondamentali della storia e della cultura persiane. Questo articolo, oltre a offrire un quadro del personaggio nel suo tempo in relazione agli ambiti politico e accademico, si propone di fare luce in particolare sul metodo adottato da Taqizadeh nello studio della spinosa questione dei sistemi calendariali del mondo iranico
The Position of Criticism in the History of Medicine Based on "A Critique of the Article, Abu al-Hasan Ahmad ibn Muhammad al-Tabari Toranji; the Famous Iranian Physician"
No full textHistorical criticism requires expertise and proficiency in general knowledge of history. Without historical knowledge, it is wrong to write a review. In writing the critique of the article "Abu al-Hasan Ahmad ibn Muhammad al-Tabari Toranji; the famous Iranian physician", year 2022, volume 24, number 1, none of the principles of historiography criticism have been observed. With a focus on historical geography, there is apparently a difference of opinion between the critics and the author of the article. Therefore, the aim of this article is critical discourse analysis of historiography and the birthplace of Abu al-Hasan Ahmad ibn Muhammad al-Tabari Toranji
A use-case-driven approach for demonstrating the added value of digitalisation in wind energy
No full textDigitalisation is one of the key drivers for reducing the costs and risks of wind energy. When considering whether to embark on a digitalisation initiative, two key questions arise. The first is what business or operational opportunities might feasibly be addressed and the second is which of the many potential aspects of digitalisation are relevant to those opportunities. In this work, we show how these questions can be answered with a use-case-driven approach, based around a survey aiming to collect and collate the main ”pain points” (or everyday challenges) of people in the wind energy sector. Although the relatively low number of participants of the survey (46) means that the results should only be used indicatively, it is still possible to make some general recommendations for priorities for digitalisation efforts in the wind energy sector. Firstly, digitalisation efforts should focus both on supporting people carrying out cross-lifecycle tasks, in particular sharing data, managing data, undertaking general data analyses and accessing data. Tools to do this should deal with varying data formats and naming conventions, make metadata more accessible, define data and metadata standards, make more data publicly available and improve the quality of data. Secondly, efforts should also focus on supporting people in the wind farm operational phase, in particular with failure detection, fault diagnosis, failure rate modelling and predictive maintenance. Solutions to do this should focus on accessible and validated tools for fault detection, cloud or other data pipeline solutions for SCADA data and tools for exhaustive data documentation. Finally, digitalisation efforts should focus on better communicating and helping people become aware of existing solutions and tools, as well as on helping people to exert a stronger influence on possible solutions
Digital Twins for Fault Prognosis in Offshore Wind Turbine Drivetrains
Get PDFThis thesis investigates the relatively novel concept of Digital Twin (DT) in the context of offshore wind turbine drivetrains. DT can be described as a virtual representation of a system or asset that calculates system states and makes system information available, through integrated models and data, with the purpose of providing decision support over its life cycle. Applying these ideas to the use case of drivetrains, there remain many research questions on the specifics of drivetrain DTs such as its model architecture, its capability and value to the user, its limitations and remaining development obstacles, and the errors and uncertainty in its output, which are addressed in this thesis. The scope is narrowed to the fault diagnosis and prognosis, i.e. the remaining useful life (RUL) estimation of mechanical drivetrain components such as bearings and gears. Through this capability, DTs can provide wind farm operators with a form of decision support and thereby contribute to a higher reliability and availability.
The investigation is divided into three sections that cover each of the main elements of DT: the data, the models and the decision support. Real-time data streams from physical sensors are crucial to inform the DT on the current state of the drivetrain. The methodology of data acquisition, processing and analysis from different sources such as SCADA and CM systems is presented.
DT models differ from conventional, standalone simulation models, in that they are connected to the physical drivetrain and must be updated continuously to reflect its behaviour. Reduced-order models are investigated, which are computationally efficient to allow real-time simulation while maintaining a sufficient model fidelity to accurately capture the complex drivetrain dynamics. In addition, state estimation and system identification methods are presented to synchronize the DT and the physical drivetrain in the kinematic states and model parameters.
Decision support are services provided by the DT that assist stakeholders in making key decisions. The focus of this thesis is the RUL estimation based on fatigue assessment, which is facilitated through online load monitoring techniques, referred to as virtual sensing. The methodology for virtual load sensing at the main bearings and at the gearbox components is developed and evaluated in numerical and experimental case studies.
This thesis contributes to a better understanding of the DT concept by developing and showcasing concrete applications for offshore wind turbine drivetrains and elaborating their capabilities, as well as the arising challenges and limitations
Effect of Cooking on Quality Commonly Consumed Marine Fish Platycephalidae (Platycephalus indicus) in Iran
Get PDFFish Platycephalus indicus usually are consumed by southern people in Iran. The present study assessed the effect of processing on proximate compositions in the fillets of P.indicus. The fish samples were prepared by boiling, baking and frying, while proximate analysis was done by standard methods. Boiling processing method significantly reduced ash content in the fillet whereas fat content was significantly increased in frying. Baking method recorded highest ash content of 10.64%. The highest protein concentration was obtained for boiled fillet (82.73%). Lipid content was recorded highest in fried fillet (17.27%). P. indicus was, rich in fat, protein, and ash, thus its consumption should be encouraged
Research into pile toe failure in Amazonehaven
No full textExtreme folding damage of open-ended tubular piles could occur during piling in onshore practices. Amazonehaven unique quay wall removal gave the opportunity to study king pile’s failure close to toe. King piles are primary piles in a combined wall system, exposed to static and dynamic load. It is argued that the unexpected pile toe failure have been caused by dynamic load because of the uniaxial direction of the extreme deformations. However, research into pile toe failure in Amazonehaven shows that hammer-induced driving stresses are significantly lower than material’s yield stress close to pile toe, given Amazonehaven soil condition. Therefore, the dynamic load has not been solely detrimental to the pile toe integrity. The main reasons for pile toe failure are discussed to be (1) pile imperfection, (2) pile inclination and (3) pile inhomogeneous strength. Bear in mind that, pile toe failure to such extent when not limited might lead to dysfunction of the asset during its technical lifetime. Therefore, counteractions must be taken to assure quay wall’s safety and stability while operating. The remedies when such a piling risk event occur could be: replacement, early maintenance, or a reduction in its designed storage capacity. The reactive solutions will bring financial consequences of pile toe failure forward. In other words, the client will experience a reduction in its revenues due to asset’s malfunction. However, when proactive process-based alternatives are implemented in the current procedure in piling industry, the probability of occurrence of the failure is to be reduced. Therefore, financial consequences of piling risk event will remain limited.The main personal objectives creating this master thesis are to present a: Compact, comprehensive, consistent, reader friendly, and to the point report
Eriophyes pyri Pagenstecher 1857
No full textEriophyes pyri (Pagenstecher, 1857) (Fig. 3 C) Type data. Pyrus communis L., pear (Rosaceae); type locality not originally stated by Pagenstecher (1857). Germany was presumed by Amrine and Stasny (1994) based on the working place of the author. Relation to the host plant. The mites inhabit leaf blisters in summer and terminal buds in winter. Smooth pustules along the leaf vein, raised on both sides of the leaf, with their openings on the lamina undersurface; pustules yellowish green at the beginning, later turning red, purple or black at maturity; pustules more or less solid with mites located between the parenchymatic cells (Keifer 1975). Geographic distribution. Nearctic, Neotropical, Palaearctic. New locality record for Iran. 10 females, 2 males and 4 nymphs from Sardrud (38 °01' 36 "N, 46 °09' 35 "E), 1,377 m above sea level, on P. communis, coll. P. Lotfollahi, 1 August 2011. Previous provincial records from Iran. East Azerbaijan, West Azerbaijan, Fars, Esfahan, Guilan, Mazandaran, Hamadan and Tehran, from Amelanchier ovalis Medik., Amelanchier vulgaris Moench, Cotoneaster fontanesii Spach, Cotoneaster nummularius Fisch. & C.A. Mey., Cotoneaster integerrimus Medik., P. communis, Pyrus ussuriensis Maxim., Sorbus americana Marshall var. sitchensis (M. Roem.) Sudw., Sorbus aria Crantz, Sorbus aucuparia L., Sorbus chamaemespilus (L.) Crantz, Sorbus torminalis (L.) Crantz (Khanjani & Haddad 2006). Remarks. This mite was collected from leaf blisters. Based on the large range of host plant species documented, a careful examination of E. pyri populations recorded on different plant hosts should be carried out, combining morphometric studies with biological and molecular data.Published as part of Lotfollahi, Parisa, Irani-Nejad, Karim Haddad & Lillo, Enrico De, 2014, Eriophyoid mites (Acari: Trombidiformes: Eriophyoidea) of Rosales trees in Iran: two new species and three new records in Zootaxa 3861 (1), DOI: 10.11646/zootaxa.3861.1.4, http://zenodo.org/record/22683
Spin-dependent energy distribution of B-hadrons from polarized top decays considering the azimuthal correlation rate
No full textAbstractBasically, the energy distribution of bottom-flavored hadrons produced through polarized top quark decays t(↑)→W++b(→Xb), is governed by the unpolarized rate and the polar and the azimuthal correlation functions which are related to the density matrix elements of the decay t(↑)→bW+. Here we present, for the first time, the analytical expressions for the O(αs) radiative corrections to the differential azimuthal decay rates of the partonic process t(↑)→b+W+ in two helicity systems, which are needed to study the azimuthal distribution of the energy spectrum of the hadrons produced in polarized top decays. These spin-momentum correlations between the top quark spin and its decay product momenta will allow the detailed studies of the top decay mechanism. Our predictions of the hadron energy distributions also enable us to deepen our knowledge of the hadronization process and to test the universality and scaling violations of the bottom-flavored meson fragmentation functions
Pilgrimage to a Ritual
No full textIn this article, the author challenges the stereotypical definition of pilgrimage as a journey to a shrine or place of religious importance and shows how Dawoodi Bohras make a pilgrimage to wherever their spiritual leader chooses to deliver his Muharram sermons. Drawing on his ethnography among this religious group, he elucidates how the rituals around a yearly religious ritual shaped the annual pilgrimage of an Indian religious group
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