2,788 research outputs found
Stochastic low-velocity impact analysis of sandwich plates including the effects of obliqueness and twist
No full textThis paper quantifies the influence of uncertainty in the low-velocity impact responses of sandwich plates with composite face sheets considering the effects of obliqueness in impact angle and twist in the plate geometry. The stochastic impact analysis is conducted by using finite element (FE) modelling based on an eight nodded isoparametric quadratic plate bending element coupled with multivariate adaptive regression spline (MARS) in order to achieve computational efficiency. The modified Hertzian contact law is employed to model contact force and other impact parameters. Newmark's time integration scheme is used to solve the time-dependent equations. Comprehensive deterministic as well as probabilistic results are presented by considering the effects of location of impact, ply orientation angle, impactor velocity, impact angle, face-sheet material property, twist angle, plate thickness and mass of impactor. The relative importance of various input parameters is determined by conducting a sensitivity analysis. The results presented in this paper reveal that the impact responses of sandwich plates are significantly affected by the effect of source-uncertainty that in turn establishes the importance of adopting an inclusive stochastic design approach for impact modelling in sandwich plates
FIGURE 3 in Recent adventive soft scale insects (Hemiptera: Coccomorpha: Coccidae) and mealybugs (Hemiptera: Coccomorpha: Pseudococcidae) in India
No full textFIGURE 3. Kilifia deltoides De Lotto, diagnostic characters of slide mounted adult female. a. Marginal setae; b. Spiracular setae; c. Dorsal setae and dark-rimmed pores; d. Close up of dark-rimmed pore showing slit-like opening; e. Preopercular pores; f. Submarginal tubercle; g. Anal plate with longer anterolateral margin; h. Setae on dorsal surface of anal plate; i. Setae on anterior margin of anogenital fold; j. Setae on lateral margin of anogenital fold; k. Pregenital disc pores; l. Spiracular pores; m. Leg showing coxal cavity; n. Claw digitules and tarsal digitules; o. Antenna; p. Ventral microducts around labium; q. Female habitus.Published as part of Joshi, Sunil, Gupta, Ankita, Shashank, P.R., Pai, Sachin G., Mohan, M., Rachana, R.R., Dubey, Vinod Kumar, Sandeep, Angalakuditi & Deepthy, K.B., 2022, Recent adventive soft scale insects (Hemiptera: Coccomorpha: Coccidae) and mealybugs (Hemiptera: Coccomorpha: Pseudococcidae) in India, pp. 213-232 in Zootaxa 5194 (2) on page 220, DOI: 10.11646/zootaxa.5194.2.4, http://zenodo.org/record/714719
FIGURE 7 in Recent adventive soft scale insects (Hemiptera: Coccomorpha: Coccidae) and mealybugs (Hemiptera: Coccomorpha: Pseudococcidae) in India
No full textFIGURE 7. Antonina thaiensis Takahashi, diagnostic characters of slide-mounted adult female. a. Antenna; b. Anal ring; c. Vulva with heavily sclerotized apophyses; d. Dorsal setae; e. Marginal conical setae; f. Multilocular disc pores; g. Trilocular pores; h. Discoidal pores; i. Large-type tubular ducts; j. Small-type tubular ducts; k. Ventral setae; l. Longer ventral setae on posterior abdominal segments; m. Disc-like pores; n. Multilocular pores posterior to vulva; o. Multilocular pores on margin and submargin, and ventral tubular ducts; p. Ventral discoidal pores; q. Female habitus.Published as part of Joshi, Sunil, Gupta, Ankita, Shashank, P.R., Pai, Sachin G., Mohan, M., Rachana, R.R., Dubey, Vinod Kumar, Sandeep, Angalakuditi & Deepthy, K.B., 2022, Recent adventive soft scale insects (Hemiptera: Coccomorpha: Coccidae) and mealybugs (Hemiptera: Coccomorpha: Pseudococcidae) in India, pp. 213-232 in Zootaxa 5194 (2) on page 226, DOI: 10.11646/zootaxa.5194.2.4, http://zenodo.org/record/714719
A Comprehensive Review of Remaining Useful Life Estimation Approaches for Rotating Machinery
Get PDFThis review paper comprehensively analyzes the prognosis of rotating machines (RMs), focusing on mechanical-flaw and remaining-useful-life (RUL) estimation in industrial and renewable energy applications. It introduces common mechanical faults in rotating machinery, their causes, and their potential impacts on RM performance and longevity, particularly in wind, wave, and tidal energy systems, where reliability is crucial. The study outlines the primary procedures for RUL estimation, including data acquisition, health indicator (HI) construction, failure threshold (FT) determination, RUL estimation approaches, and evaluation metrics, through a detailed review of published work from the past six years. A detailed investigation of HI design using mechanical-signal-based, model-based, and artificial intelligence (AI)-based techniques is presented, emphasizing their relevance to condition monitoring and fault detection in offshore and hybrid renewable energy systems. The paper thoroughly explores the use of physics-based, data-driven, and hybrid models for prognosis. Additionally, the review delves into the application of advanced methods such as transfer learning and physics-informed neural networks for RUL estimation. The advantages and disadvantages of each method are discussed in detail, providing a foundation for optimizing condition-monitoring strategies. Finally, the paper identifies open challenges in prognostics of RMs and concludes with critical suggestions for future research to enhance the reliability of these technologies
H. J. Bhabha : a case study of synchronous references
Get PDFQuantitative analysis of the events of synchronous references in the research papers followed throughout the publishing career of an individual scientist revealed interesting highlights on the knowledge-generating-system. In the case study of Homi Jehangir Bhabha first quinquennium and fifth quinquennium of his research career had low Self-references; third quinquennium and fourth quinquennium had moderate Self-references; whereas second quinquennium had highest Self-references. The two major clusters of Self-references occurring during the second and third quinquennium were indicators of active periods of knowledgegenerating and faster communications.(Revised version published in 2006 in International Journal of Nuclear Knowledge Management,Vol.2. No.1. pp.14-30. see PDF2
What is the Time Limit for Filing a Lawsuit? It Depends on What Your Definition of Arising Under Is! An Analysis of Jones v. R.R. Donnelley & Sons Co.
Get PDFThis article previews the Supreme Court case Jones et. al. v. R.R. Donnelly & Sons Co., 541 U.S. 369 (2004). The author predicted that the case would require the court to determine the appropriate statute of limitations to apply in a class action race-discrimination lawsuit filed under 42 U.S.C. § 1981
Dynamic synchromodal transport planning under uncertainty: A reinforcement learning approach
No full textAccepted Author ManuscriptTransport Engineering and Logistic
The Scope of Employer Liability for Employee Exposure to a Hazardous Substance: No Harm, No Foul? An Analysis of Metro-North Commuter R.R. Co. v. Buckley
Get PDFThis article previews the Supreme Court case Metro-North Commuter R.R. Co. v. Buckley, 521 U.S. 424 (1997). The author expected the Court to decide whether a railroad worker who is covered by the Federal Employer\u27s Liability Act who has been exposed to asbestos because of employer negligence but who has not developed an asbestos-related disease can recover damages for emotional distress caused by the exposure
Lasers in medical applications: R&D Mapping
Get PDFA study of the MEDLINE CDROM database, for the period 1969-2000 was undertaken. The purpose was, to identify core areas of research and development, in the field of applications of lasers to humans, along with other bibliometric indicators of research. A total of 34,833 records were retrieved, downloaded and analysed. The results
indicate a steady increase in the number of publications every year, from 1970 onwards, with 1997 (2767 articles) and 1998 (2914 articles) being the most productive years. The most prolific contributors were J. Haut, with 95 publications to his credit, followed by M. Landthaler (82), G. Coscas (79), S.G. Bown (73) and P. Bjerring (70). Collaboration among the authors was high, with a maximum of 15 contributors observed in a few articles. The top ranking journal in the field was Ophthalmology, which published 769 articles starting from 1978. USA was way ahead as the country with the highest journal productivity (around 40% of the total number of records), followed by UK and Germany.
A total of 103 articles were published from India. English was the preferred language of publication, with 75% of the records being published in English language. In the use of
lasers for humans, maximum number of records were found for adult and middle aged populations. Research focussed on the eye and its various diseases. Lasers were found to
be used for therapeutic purposes, in surgery and in the diagnosis of diseases. Carbondioxide laser was most frequently used for medical applications. Though there
were quite a few references on the adverse effects of lasers, the therapeutic effects far outweighed them
Multi-agent model predictive control for transportation networks: Serial versus parallel schemes
No full textWe consider the control of large-scale transportation networks, like road traffic networks, power distribution networks, water distribution networks, etc. Control of these networks is often not possible from a single point by a single intelligent control agent; instead control has to be performed using multiple intelligent agents. We consider multi-agent control schemes in which each agent employs a model-based predictive control approach. Coordination between the agents is used to improve decision making. This coordination can be in the form of parallel or serial schemes. We propose a novel serial coordination scheme based on Lagrange theory and compare this with an existing parallel scheme. Experiments by means of simulations on a particular type of transportation network, viz., an electric power network, illustrate the performance of both schemes. It is shown that the serial scheme has preferable properties compared to the parallel scheme in terms of the convergence speed and the quality of the solution. If you want to cite this report, please use the following reference instead: R.R. Negenborn, B. De Schutter, and J. Hellendoorn, “Multi-agent model predictive control for transportation networks: Serial versus parallel schemes,” Engineering Applications of Artificial Intelligence, vol. 21, no. 3, pp. 353–366, Apr. 2008.Delft Center for Systems and ControlMechanical, Maritime and Materials Engineerin
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