Academic literature on the topic 'Alert limits'
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Journal articles on the topic "Alert limits"
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Hussain, Mustafa I., Tera L. Reynolds, and Kai Zheng. "Medication safety alert fatigue may be reduced via interaction design and clinical role tailoring: a systematic review." Journal of the American Medical Informatics Association 26, no. 10 (June 17, 2019): 1141–49. http://dx.doi.org/10.1093/jamia/ocz095.
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Abstract Objective Alert fatigue limits the effectiveness of medication safety alerts, a type of computerized clinical decision support (CDS). Researchers have suggested alternative interactive designs, as well as tailoring alerts to clinical roles. As examples, alerts may be tiered to convey risk, and certain alerts may be sent to pharmacists. We aimed to evaluate which variants elicit less alert fatigue. Materials and Methods We searched for articles published between 2007 and 2017 using the PubMed, Embase, CINAHL, and Cochrane databases. We included articles documenting peer-reviewed empirical research that described the interactive design of a CDS system, to which clinical role it was presented, and how often prescribers accepted the resultant advice. Next, we compared the acceptance rates of conventional CDS—presenting prescribers with interruptive modal dialogs (ie, “pop-ups”)—with alternative designs, such as role-tailored alerts. Results Of 1011 articles returned by the search, we included 39. We found different methods for measuring acceptance rates; these produced incomparable results. The most common type of CDS—in which modals interrupted prescribers—was accepted the least often. Tiering by risk, providing shortcuts for common corrections, requiring a reason to override, and tailoring CDS to match the roles of pharmacists and prescribers were the most common alternatives. Only 1 alternative appeared to increase prescriber acceptance: role tailoring. Possible reasons include the importance of etiquette in delivering advice, the cognitive benefits of delegation, and the difficulties of computing “relevance.” Conclusions Alert fatigue may be mitigated by redesigning the interactive behavior of CDS and tailoring CDS to clinical roles. Further research is needed to develop alternative designs, and to standardize measurement methods to enable meta-analyses.
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Dik, V. Y., V. A. Allakhverdyan, A. D. Avrorin, A. V. Avrorin, V. M. Aynutdinov, R. Bannasch, Z. Bardačová, et al. "Follow-up of the IceCube alerts with the Baikal-GVD telescope." Journal of Instrumentation 16, no. 11 (November 1, 2021): C11008. http://dx.doi.org/10.1088/1748-0221/16/11/c11008.
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Abstract The high-energy muon neutrino events of the IceCube telescope, that are triggered as neutrino alerts in one of two probability ranks of astrophysical origin, “gold” and “bronze”, have been followed up by the Baikal-GVD in a fast quasi-online mode since September 2020. Search for correlations between alerts and GVD events reconstructed in two modes, muon-track and cascades (electromagnetic or hadronic showers), for the time windows ±1 h and ±12 h does not indicate statistically significant excess of the measured events over the expected number of background events. Upper limits on the neutrino fluence will be presented for each alert.
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Tillman, J., and J. H. Barth. "A survey of laboratory 'critical (alert) limits' in the UK." Annals of Clinical Biochemistry: International Journal of Laboratory Medicine 40, no. 2 (March 1, 2003): 181–84. http://dx.doi.org/10.1258/000456303763046148.
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Introduction: Critical or alert limits are the values of laboratory measurements that are regarded as requiring urgent clinical action and should be communicated to a clinician urgently. Despite this, there has been little evaluation of these values in the UK. Methods: We have conducted a survey of hospital biochemistry laboratories in the UK. Results: Ninety-four laboratories responded to the questionnaire; the response rate was not recorded. Twenty-three laboratories had derived their action limits locally from a consensus with their clinicians, experience over many years, and the literature. Only two laboratories quoted literature to support their values. Seven laboratories did not submit actual critical values. There was considerable variance in the values defined as critical by the responding laboratories. Discussion: Each laboratory needs to evaluate its own list of acutely important critical values and aim for a small number of analytes that are always communicated to the doctor, so that clinical needs are met without raising the risk of information overload.
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Ramsey, Jerry D., and Yeong G. Kwon. "Recommended alert limits for perceptual motor loss in hot environments." International Journal of Industrial Ergonomics 9, no. 3 (May 1992): 245–57. http://dx.doi.org/10.1016/0169-8141(92)90018-u.
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Kane, Elizabeth, Alice Lippitt, Octavio Aragon Cuevas, and Andrea Gill. "P17 Dose range checking (DRC) in paediatric electronic prescribing; an effective tool in reducing prescribing errors?" Archives of Disease in Childhood 107, no. 5 (April 20, 2022): e25.18-e25. http://dx.doi.org/10.1136/archdischild-2022-nppg.25.
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AimDRC software aims to reduce dosing errors,1 however, it has been linked to ‘alert fatigue’, a phenomenon which causes prescribers to potentially override alerts despite being clinically relevant.2 3 The project aim is to determine the effectiveness of the DRC software implemented into the electronic prescribing software used in a paediatric tertiary hospital.MethodA retrospective clinical audit was undertaken to investigate the DRC alerts produced during July and August 2020. The DRC alert subtypes and the top 10 drugs that produced alerts were described. Alerts generated due to a ‘missing value’ (height, weight, or dose unit) were counted but not analysed further. Dose-based alerts were clinically screened to ascertain whether they were appropriately or inappropriately overridden. This involved considering whether the DRC recommendations differed from BNFc recommendations, local in-house guidance, or deviations occurred due to individual patient idiosyncrasies or specialist prescribing. Data from dose-based alerts was interrogated to determine whether increasing the acceptable dose range limit from 5% to 10% would have significantly reduced the number of alerts fired. Alerts that were inappropriately overridden and resulted in a medication error were categorised by severity using the EQUIP study scoring tool.3Results1778 alerts generated in July and August 2020 were analysed. 48% (n=846) of those alerts were produced due to a ‘missing value’. The DRC software did not recognise whether the alerted drug was recorded at the same dose in the patients’ ‘home medications’ (verified drug history) or whether in-house dose guidance was used. If recognised, the number of alerts would have reduced by 21.4% (n=200). Conversely, increasing the DRC acceptable dose range from 5 to 10% would have reduced the number of alerts only by 4.5% (n=42).Overall, 741 alerts were clinically screened. 95% (n=704) of these were not actioned by prescribers. Of those alerts 5.2% (n=37) should have been acted upon and this led to medication errors. 35% (n=13) of the errors were significant and 22% (n=8) were serious according to the EQUIP study tool. 62.5% (n=5) of serious medication errors involved a ‘Narrow Therapeutic Index’ drug, such as gentamicin and liposomal amphotericin. 38% (n=5) of significant errors related to no prescribed maximum frequency for intravenous ondansetron.ConclusionDRC systems are effective tools for preventing prescribing errors,1 but it is concerning to see that several significant and serious prescribing errors occurred despite an alert generation. This potentially suggests that alert fatigue may counteract the error preventing effects of DRC alerts. Therefore, further refinement of DRC systems is required to reduce alert fatigue. Unfortunately, increasing the acceptable dose range limits from 5 to 10% does not appear to be a simple way of sorting this problem. Removing ‘missing value’ alerts would significantly reduce the number of alerts generated. Including in-house guidelines alongside BNFc dose recommendations into the DRC software would also reduce unnecessary alerts.ReferencesSahota H, Hughes P, Barrass C, et al. Delivering electronic prescribing and medicines administration in challenging areas such as paediatrics and maternity at King’s College Hospital NHS Foundation Trust. Clinical Medicine Journal [Internet] 2015;15:s5. Available at: https://www.rcpjournals.org/content/clinmedicine/15/Suppl_3/s5Neame M, Moss J, Saez Dominguez J, et al. The impact of paediatric dose range checking software. European Journal of Hospital Pharmacy [Internet] 2020. Available at: https://ejhp.bmj.com/content/early/2020/03/31/ejhpharm-2020-002244Dornan T, Ashcroft D, Heathfield H, et al. An in-depth investigation into causes of prescribing errors by foundation trainees in relation to their medical education. EQUIP study final report. December 2009. Available at: https://www.gmc-uk.org/-/media/documents/FINAL_Report_prevalence_and_causes_of_prescribing_errors.pdf_2893 5150.pdf
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EDREI, Tsah, and Shabtai ISAAC. "Construction site safety control with medium-accuracy location data." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 23, no. 3 (June 22, 2016): 384–92. http://dx.doi.org/10.3846/13923730.2016.1144644.
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A statistical safety control method is presented that utilizes location data from a relatively inaccurate yet cost-effective system to track workers in real time, and prevent unsafe situations at construction sites. In light of the inaccuracy of the tracking system, buffer areas are defined as statistical zones, at some distance from potential workplace hazards. Statistical alerts are created according to predefined rules when the hazard exposure of workers in those zones crosses a certain threshold. The results of tests of the method demonstrate that the model is able to successfully process the location data in order to compensate for its inaccuracy. This is done without necessitating a significant increase in the areas that are defined as being of high risk, and therefore off-limits for most workers on site. The model can thus ensure the efficiency of the construction work by restricting the size of the areas on site that are off-limits for most workers, while at the same time ensuring the safety of workers. The method can also ensure that alerts will not be ignored by using statistical rules to avoid an excessive number of alerts, and by discerning who should be the client of an alert.
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Springer, Simon. "The limits to Marx." Dialogues in Human Geography 7, no. 3 (November 2017): 280–94. http://dx.doi.org/10.1177/2043820617732918.
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Responding to David Harvey’s critique of my article, ‘Why a Radical Geography Must Be Anarchist’, I reiterate the importance of anarchist perspectives in contemporary politics and geographical praxis. In challenging Harvey on the limits to Marx, I urge him to think again about the hidden vanguardism, implied statism, and veiled hierarchy that continue to lurk within the Marxist project, and importantly how these specters constrain both our collective political imagination and the possibilities of radical geography. I am admittedly very critical of Harvey, but I nonetheless refuse to close the door on dialogue between the Black and Red, even in the face of ongoing Marxist ridicule of anarchist politics. Accordingly, I propose an agonistic embrace of a ‘postfraternal’ or ‘postsororal’ politics on the left, where we come to appreciate ongoing conflict as a sign of a healthy leftist milieu. In doing so, we can move beyond the misguided idea that all disagreements over strategies, tactics, and organizing methods will ever be resolved. Ultimately, what I have dubbed ‘the condition of postfraternity’ keeps us alert to the continually unfolding possibilities of a thoroughly politicized and forever protean space. By embracing this shifting horizon, not as a static limit to our politics but as a beautiful enabler of visionary possibilities, the rhizomes of emancipation grow stronger.
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Dikenstein, Violeta. "Vecinos en alerta: un rol difícil de institucionalizar. Estudio en la Ciudad de Buenos Aires." URVIO. Revista Latinoamericana de Estudios de Seguridad, no. 24 (May 10, 2019): 151–66. http://dx.doi.org/10.17141/urvio.24.2019.3790.
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En este artículo nos proponemos analizar la actividad de un conjunto de actores, residentes de un barrio del sur de la ciudad de Buenos Aires, que hacen de la inseguridad su ámbito de intervención, de ejercicio y de “trabajo”, a quienes denominamos –provisoriamente– vecinos en alerta. Desde una perspectiva cualitativa basada en la realización de entrevistas en profundidad con los actores implicados en el proceso estudiado y observación participante en los múltiples escenarios por donde circulan, reconstruimos los perfiles de los vecinos en alerta, el repertorio de actividades que llevan adelante, las relaciones que establecen entre sí y con otros actores, los lazos de coordinación y conflicto que entablan en este transcurso, así como las situaciones de interacción en las que este rol entra en juego. Hallamos que hay un repertorio compartido de actividades que desempeñan estos actores, variado dentro de ciertos límites. También, que el rol de vecino en alerta está sujeto a una constante negociación y redefinición, en las instancias de encuentro con diversas autoridades institucionales encargadas de la seguridad.
Abstract
In this article we propose to analyze the activity of a group of people, residents of a neighborhood in the south of the city of Buenos Aires, who make insecurity their area of intervention, exercise and "work", whom we call alert neighbors. From a qualitative perspective based on in-depth interviews with those involved in the process studied, and participatory observation in the scenarios where they circulate, we describe the profiles of the alert neighbors, the repertoire of activities that they carry out, the relationships they establish among themselves and with other actors, the bonds of coordination and conflict that they establish in this course, as well as the situations of interaction in which this role comes into play. We find that there is a shared repertoire of activities performed by these actors, varied within certain limits. Also, that the role of alert neighbor is subject to constant negotiation and redefinition, in the instances of meeting with various institutional authorities in charge of security.
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Kavitha, A., N. Ashok Kumar, and M. Revathy. "Automatic Identification of Maritime Boundary Alert System using GPS." International Journal of Engineering & Technology 7, no. 3.1 (August 4, 2018): 20. http://dx.doi.org/10.14419/ijet.v7i3.1.16788.
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Global Positioning System (GPS) is being used more and more for a wide range of applications. This is a reliable position, navigation for end-users of anywhere in the world or around the globe, on any weather, day or night. The synchronization benefit gives that the GPS has three segments: space, control and client GPS has turned into a broadly utilized route apparatus over the world and turn into a helpful instrument for mapping, overviews, business, logical utilizations, checking and diversion has gone. As in any of the current GPS systems of geographic and entertainment, the security requirements of civilian navigation in the sea are met because the sea border of a country cannot be marked. This work concentrates on the flexibility and utility of a GPS in the ocean. The principle motivation behind the work is to help anglers explore past the limits of different nations. In the event that an angler goes past the limits of the nation, at that point a notice emerges, showing that the anglers have crossed the outskirt. Furthermore, a GSM transmitter interface will make an impression on construct station situated with respect to the shore showing that a vessel has crossed the fringe. Hence protects in the shore can help and give extra help to those anglers if necessary. Remembering about existences of Indian anglers, this gadget has been made to help them not to move past Indian. Overall, it is an endeavor to fabricate an appropriate gadget for the anglers at a sensibly ease.
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Yang, H., W. Zhao, T. O'day, and W. Fleming. "Environmental Monitoring: Setting Alert and Action Limits Based on a Zero-Inflated Model." PDA Journal of Pharmaceutical Science and Technology 67, no. 1 (January 1, 2013): 2–8. http://dx.doi.org/10.5731/pdajpst.2013.00897.
Full textDissertations / Theses on the topic "Alert limits"
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Argoud-Sigaud, Chantal. "Les Bases stylistiques du rire et de ses limites dans "Mangeclous" d'Albert Cohen." Lille 3 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37594461b.
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Alverdi, Luca. "Imagens da catástrofe ecológica na ficção científica brasileira, de " Parada 88: o limite de alerta" a " Acquaria"." Master's thesis, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa, 2012. http://hdl.handle.net/10362/9406.
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Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do
grau de Mestre em Ciências da Comunicação, área de especialização em Cinema e
TelevisãoO objetivo principal da presente dissertação é evidenciar a capacidade do cinema brasilero de Ficção Científica de perspetivar de forma original e peculiar a utopia ecológica (ou ecotopia), através da representação do seu oposto, isto é, a distopia ecológica (ou ecodistopia). O objetivo secundário é avaliar os efeitos performativos deste tipo de representação cinematográfica de género, no que diz respeito à evolução duma nova consciência ecológica por parte do espectador. Para concretizar os objetivos propostos, escolheram-se como estudo de caso dois filmes: Parada 88: O Limite de Alerta (1978) de José de Anchieta, e Acquaria (2004) de Flávia Moraes.
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Jeram, Geoffrey James Joseph. "Open Platform for Limit Protection with Carefree Maneuver Applications." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4933.
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This Open Platform for Limit Protection guides the open design of maneuver limit protection systems in general, and manned, rotorcraft, aerospace applications in particular. The platform uses three stages of limit protection modules: limit cue creation, limit cue arbitration, and control system interface. A common set of limit cue modules provides commands that can include constraints, alerts, transfer functions, and friction. An arbitration module selects the best limit protection cues and distributes them to the most appropriate control path interface. This platform adopts a holistic approach to limit protection whereby it considers all potential interface points, including the pilots visual, aural, and tactile displays; and automatic command restraint shaping for autonomous limit protection.
For each functional module, this thesis guides the control system designer through the design choices and information interfaces among the modules. Limit cue module design choices include type of prediction, prediction mechanism, method of critical control calculation, and type of limit cue. Special consideration is given to the nature of the limit, particularly the level of knowledge about it, and the ramifications for limit protection design, especially with respect to intelligent control methods such as fuzzy inference systems and neural networks.
The Open Platform for Limit Protection reduces the effort required for initial limit protection design by defining a practical structure that still allows considerable design freedom. The platform reduces lifecycle effort through its open engineering systems approach of decoupled, modular design and standardized information interfaces.
Using the Open Platform for Limit Protection, a carefree maneuver system is designed that addresses: main rotor blade stall as a steady-state limit; hub moment as a transient structural limit; and pilot induced oscillation as a controllability limit. The limit cue modules in this system make use of static neural networks, adaptive neural networks, and fuzzy inference systems to predict these limits. Visual (heads up display) and tactile (force-feedback) limit cues are employed. The carefree maneuver system is demonstrated in manned simulation using a General Helicopter (GENHEL) math model of the UH-60 Black Hawk, a projected, 53 degree field of view for the pilot, and a two-axis, active sidestick for cyclic control.
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Soares, Roosewelt Fonseca. "Efeito de campo aleat?rio no modelo Sherrington-Kirkpatrick." Universidade Federal do Rio Grande do Norte, 1993. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16594.
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Previous issue date: 1993-03-05Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior
O vidro de spins de Ising com intera??es de alcance infinito (modelo Sherrington Kirkpatrick), na presen?a de um campo magn?tico aleat?rio distribu?do segundo uma lei de probabilidades gaussiana, ? investigado pelo m?todo das r?plicas. Na aproxima??o de simetria entre r?plicas, a fronteira cr?tica que separa as duas fases poss?veis, Ferromagn?tica (F) e Independente (I), ? determinada. A an?lise de estabilidade de Almeida Thouless ? efetuada e as regi?es de instabilidade da solu??o de simetria entre r?plicas s?o encontradas: I (parte inst?vl da parte I) e F (PARTE INST?VEL DA FASE f). Tais regi?es podem ser identificadas respectivamente, com as fases de vidro de spins e ferromagn?tica mista do modelo Sherrington Kirkpatrick
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Musacchio, Saman. "Enquête sur les limites de l'engagement, Les justes comme illustration de l'influence et de la tentation russes chez Albert Camus." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ40015.pdf.
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Suppia, Alfredo Luiz Paes de Oliveira 1975. "Limite de alerta! Ficção cientifica em atmosfera rarefeita : uma introdução ao estudo da FC no cinema brasileiro e em algumas cinematografias off-Hollywood." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/285029.
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Orientador: Jose Mario Ortiz RamosTese (doutorado) - Universidade Estadual de Campinas, Instituto de Artes
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Resumo: ¿A Ficção Científica no Brasil: Um planeta quase desabitado.¿ Esse é o título de um artigo do crítico e escritor Fausto Cunha1, referente à literatura de ficção científica, mas que poderia ser aplicado também à análise do gênero no cinema brasileiro. Na Europa, nos EUA e no Japão, o cinema de ficção científica encontra terreno fértil. Sua relevância estética e econômica é evidente, desde o período mudo, sendo até hoje freqüente objeto de estudo. No Brasil, entretanto, a situação é um pouco diferente, uma vez que a ficção científica cinematográfica tem sido frequentemente encarada como algo ¿fora de lugar¿. Afinal, podemos falar de ficção científica no cinema brasileiro? Esta tese traz uma resposta afirmativa a essa pergunta, muito embora tenhamos de levar em consideração algumas peculiaridades. Ao contrário dos EUA e Europa, o Brasil não tem grande tradição no estudo da ficção científica. Apesar disso, escritores brasileiros de ficção científica têm obtido reconhecimento internacional, e o cinema brasileiro tem tido experiências na produção de filmes do gênero. Por exemplo, manifestações da ficção científica no cinema brasileiro podem ser detectadas em comédias ou chanchadas dos anos 1940/50, distopias ecológicas dos anos 1970/80 e na produção mais recente, da retomada aos dias atuais. Mas por que o cinema brasileiro de ficção científica não tem tido maior desenvolvimento e visibilidade? Esta e outras perguntas serão discutidas neste trabalho, com base em bibliografia geral e especializada, análise fílmica e entrevistas com autores, cineastas e pesquisadores. Em suma, o objetivo desta tese é levantar um novo debate mais detido acerca da ficção científica no cinema brasileiro e demais cinematografias que não a hollywoodiana, apresentando um panorama que busca melhor compreender o passado, presente e futuro de um gênero que insiste em sobreviver numa atmosfera muitas vezes hostil e rarefeita
Abstract: ¿SF in Brazil: A barely inhabited planet¿ is the title of Fausto Cunha¿s essay on Brazilian science fiction literature, and the starting point for this paper, as this approach could be also applied to the study of Brazilian science fiction cinema. In Europe, the United States and Japan, science fiction film has a long history since the early days of cinema, and continues to find fertile ground still today. Its economical and aesthetical relevance is outstanding and widely recognized. However, in Brazil the situation is rather different, and a national science fiction cinema is usually overlooked by film critics and scholars. Then again, can one talk about science fiction in Brazilian cinema? This dissertation brings an affirmative answer to this question, even though considering some particular features. Contrary to the United States and Europe, Brazil does not have a tradition in science fiction studies. Despite this fact, Brazilian science fiction writers have been awarded around the world and Brazilian cinema does have experiences in science fiction film production ¿ for example, from the 1940/50¿s comedies and chanchadas to 1970/80¿s ecological distopias and fin-de-siècle dark comedies. But why has Brazilian science fiction cinema been prevented from further development? This question, among others, will be herein discussed, based on general and specific bibliography, film analysis and interviews with writers, scholars and filmmakers. In sum, the aim of this paper is to raise a new and careful discussion on science fiction in the Brazilian cinema and other off-Hollywood filmographies, outlining a panorama that attempts to better understand the past, present and future of a genre that insists on surviving in a rather hostile and rarefied atmosphere
Doutorado
Doutor em Multimeios
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Oliveira, Lorena Tavares de. "Avalia??o gen?tica da probabilidade de prenhez em novilhas da ra?a Sindi via modelos de limiar em regress?o aleat?ria." UFVJM, 2016. http://acervo.ufvjm.edu.br/jspui/handle/1/1289.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG)
Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq)
Objetivou-se com este estudo estimar par?metros gen?ticos e fenot?picos para probabilidade de prenhez nas idades 15, 19, 23, 27, 31, 35, 39 e 43 meses (PP_15, PP_19, PP_23, PP_27, PP_31, PP_35, PP_39 e PP_43), em novilhas da ra?a Sindi, via modelo de limiar em regress?o aleat?ria utilizando os polin?mios ortogonais de Legendre de segunda, terceira e quarta ordem, considerando a homogeneidade e heterogeneidade de vari?ncia residual. Os componentes de covari?ncia foram estimados por abordagem Bayesiana, utilizando o programa THRGIBBS3F90. Foram inclu?dos os efeitos fixos de criador, fazenda do criador, ano de nascimento, esta??o de nascimento e como covari?vel (de efeito linear) foi considerado o peso da vaca na idade em que ela concebeu. Al?m desses efeitos para todas as idades estudadas, foram considerados os efeitos aleat?rios gen?ticos aditivos, de ambiente permanente e residual. O melhor modelo para a an?lise RRTM foi o LEG_4441 que obteve as seguintes estimativas de herdabilidade 0,34; 0,41; 0,45; 0,41; 0,37; 0,32; 0,32; 0,33 para PP_15, PP_19, PP_23, PP_27, PP_31, PP_35, PP_39, PP_43, respectivamente. As estimativas das correla??es gen?ticas obtidas entre PP_15 com PP_19, PP_23, PP_27, PP_31, PP_35, PP_39 e PP_43 foram 0,1; -0,39; -0,65; -0,83; -0,93; -0,81; -0,71, respectivamente. As estimativas das correla??es fenot?picas para PP_15 com PP_19, PP_23, PP_27, PP_31, PP_35, PP_39 e PP_43 foram respectivamente 0,12; -0,09; -0,17; -0,22; -0,26; -0,25; 0,40. A an?lise que utilizou modelo LEG_4441 foi a mais indicada para estimar os par?metros gen?ticos para a probabilidade de prenhez em diferentes idades em novilhas da ra?a Sindi, indicando que a prenhez precoce possui variabilidade gen?tica para ser inclu?da como caracter?stica alvo de sele??o em programas de melhoramento, com potencial para se obter ganhos gen?ticos satisfat?rios.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2016.
Our aim with this study was estimating genetic and phenotypic parameters for pregnancy probability at 15, 19, 23, 27, 31, 35, 39 and 43 month old (PP_15, PP_19, PP_23, PP_27, PP_31, PP_35, PP_39 and PP_43) in Sindhi heifers, by using threshold model in a random regression framework, adopting Legendre orthogonal polynomials of second, third and fourth order, considering homogeneity and heterogeneity of residual variance. Covariance components were estimated by Bayesian approach using THRGIBBS3F90 program. The model included the fixed effects of herd, herd of the farm, year of birth, birth season and as a covariate (with linear effect) was considered the weight of the cow at the age when she calved. In addition to these effects for all ages studied, additive genetic, permanent environmental and residual random effects were considered. The best model for the analysis was the RRTM LEG_4441 which obtained the following heritability estimates: 0.34; 0.41; 0.45; 0.41; 0.37; 0.32; 0.32; 0.33 to PP_15, PP_19, PP_23, PP_27, PP_31, PP_35, PP_39 and PP_43, respectively. Genetic correlation estimates between PP_15 with PP_19, PP_23, PP_27, PP_31, PP_35, PP_39 and PP_43 were 0.1; -0.39; -0.65; -0.83; -0.93; -0.81; -0.71, respectively. Phenotypic correlation estimates for PP_15 with PP_19, PP_23, PP_27, PP_31, PP_35, PP_39 and PP_43 were respectively 0.12; -0.09; -0.17; -0.22; -0.26; -0.25; 0.40. The analysis by using LEG_4441 model was the most appropriate to estimate genetic parameters for pregnancy probability at different ages in Sindhi heifers, indicating that early pregnancy has genetic variability to be included as a goal trait selection in breeding programs, with the potential to achieve satisfactory genetic gains.
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Gama, André Bueno. "Podridão floral dos citros: definição do limiar de ação para controle químico e monitoramento da sensibilidade de isolados a tebuconazol e trifloxistrobina." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-19102017-105445/.
Full textAbstract:
A citricultura brasileira se destaca no mercado global de citros, apresentando altos valores de produção e produtividade. Dentre as diversas doenças que afetam a cultura, a podridão floral dos citros (PFC) vem ganhando destaque com o deslocamento de áreas produtoras para regiões mais favoráveis à ocorrência desta doença. A PFC, causada por espécies dos complexos Colletotrichum acutatum e C. gloeosporioides, é especialmente problemática em anos de temperaturas amenas e alta umidade. Os citricultores realizam pulverizações preventivas para o controle da PFC todos os anos, embora condições climáticas favoráveis à doença ocorram apenas ocasionalmente. Além do impacto econômico, as frequentes pulverizações com fungicidas aumentam a pressão de seleção sobre isolados resistentes, o que pode interferir na eficiência do controle químico. A utilização de sistemas de previsão de epidemias pode evitar que pulverizações desnecessárias de fungicidas sejam realizadas caso não haja condições favoráveis à ocorrência da doença. Para o desenvolvimento destes sistemas, é imprescindível determinar um limiar de ação para a aplicação de fungicidas nos pomares. Dessa forma, o presente trabalho teve por objetivos: (i) estabelecer um limiar de ação para a aplicação de fungicidas com base na germinação de conídios de C. acutatum que permita o controle a doença igualmente ou de forma mais eficiente do que o sistema de pulverização adotado pelos citricultores do sudoeste paulista; (ii) caracterizar a sensibilidade de isolados dos complexos C. gloeosporioides e C. acutatum à trifloxistrobina e ao tebuconazol in vitro e molecularmente, para identificar possíveis mudanças de sensibilidade das espécies a estes fungicidas. Para a definição do limiar de ação, tratamentos baseados em índices de risco foram comparados ao tratamento testemunha e ao calendário fixo de aplicações, usualmente adotado pelos produtores. A aplicação de fungicidas quando limiar de 15% de germinação de conídios era atingido, foi eficiente em controlar a doença e reduzir o número de aplicações de fungicidas. Nos ensaios de sensibilidade a fungicidas dois métodos foram utilizados para a determinação da CE50: o da diluição em gradiente espiral para trifloxistrobina e tebuconazol e o da inibição da germinação de conídios para a trifloxistrobina. Foram utilizados isolados coletados entre 1999 e 2016. A CE50 média da coleção de isolados de acordo com o método da diluição em gradiente espiral variou de 0,158 a 0,297 μg/ml e 0,1 a 0,182 μg/ml para trifloxistrobina e tebuconazol, respectivamente. Para a trifloxistrobina, de acordo com o método da inibição da germinação, a CE50 média foi de 0,002 μg/ml. Não foram verificadas características moleculares nem valores de CE50 atrelados à mudança de sensibilidade dos isolados.Brazilian citrus industry represents a significant share in the global citrus market. Amongst several diseases that affect the crop, postbloom fruit drop (PFD) has been gaining prominence in Sao Paulo with the displacement of citrus areas to regions in which weather conditions are more favorable to the occurrence of this disease. PFD, caused by species of the complexes Colletotrichum acutatum and C. gloeosporioides, is especially problematic in years of mild temperatures and high humidity. Citrus growers spray the orchards preventively for PFD control every year, although favorable climatic conditions do not occur regularly. In addition to the economic impact, this practice increases the selection pressure of fungicide resistant isolates, and may decrease the efficiency of chemical control in a long term. The use of disease forecasting systems is able to prevent unnecessary fungicide sprays. For the development of such systems, it is essential to determine an action threshold for the application of fungicides in the orchards. The objectives of this work were: (i) to establish an action threshold for fungicide sprays based on the germination of C. acutatum conidia; (ii) to characterize the sensitivity of C. gloeosporioides and C. acutatum isolates to trifloxystrobin and tebuconazole in vitro and molecularly. Regarding the definition of the action threshold, treatments based on risk indices were compared to the control treatments and calendar based sprays, usually adopted by growers. The 15% conidia germination threshold was efficient in controlling the disease and reducing the number of fungicide applications. In the fungicide sensitivity tests, two methods were used to determine the EC50, the spiral gradient dilution for trifloxystrobin and tebuconazole, and the method of conidial germination inhibition for trifloxystrobin. Isolates collected between 1999 and 2016 were used. The mean EC50 of the isolate collection determined by the spiral gradient dilution method ranged from 0.158 to 0.297 μg/ml and from 0.1 to 0.182 μg/ml for trifloxystrobin and tebuconazole, respectively. Mean EC50 of trifloxystrobin estimated by the conidial germination inhibition method was 0.002 μg/ml. No mutations or EC50 values indicated shifts of fungicide sensitivity on the isolates.
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Madusise, Albert. "Small and medium enterprises access to bridging finance : the case of kingdom bank africa limited / Albert Madusise." Thesis, 2012. http://hdl.handle.net/10394/14962.
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A major problem faced by Small and Medium Enterprises (SMEs) in Botswana is the
lack of adequate access to bank finance. This dissertation was carried out to
understand the problems faced by SMEs in accessing bank finance in Botswana.
The key method was quantitative, supported by some qualitative processes. The
case of respondents who had applied for loans at Kingdom Bank Africa Limited was
used. A questionnaire and interviews were used to collect data from the
respondents. Findings indicated that SMEs encountered problems in accessing bank
finance and most of those who managed only got part of the loan applied for. The
major challenges encountered by SMEs were information asymmetry and lending
criteria. The strategy recommended to improve availability of finance was close
collaboration between banks and SMEs. The study will be of interest to banks and
financial institutions interested in economic development. SMEs contribute to
economic development in various ways: by creating employment, raising living
standards and providing innovation. The banks become aware of SMEs frustrations
and the need to assist SMEs to address some of these challenges which hamper
access to bridging finance.Thesis (MBA) North-West University, Mafikeng Campus, 2012
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Gomes, Elsa Pinto Basto 1992. "Infinito - possível : arte e suicídio." Master's thesis, 2018. http://hdl.handle.net/10451/34392.
Full textAbstract:
This research began by seeking an answer to my own restlessness: understanding what makes artistic necessity a vital necessity. This quest led me along unanswered questions. From the initial question I was led to think about the why, the how and the what for of existence, retreating to the reflection on whether this life is or not worth living, and thus raising the problem of suicide. In this sense, I found an affinity between art and suicide: its common origin in the deepest of our abysses. Where do art and suicide meet in order to split away?
This research will try to clarify the possibility of art as a possible contraposition to suicide. With this propose will be analyzed two works that reflect on these themes: Abbas Kiarostami’s The Taste of Cherry, and the philosophical essay The Myth of Sisyphus, by Albert Camus. The work is divided into two parts: a first part containing three chapters - Preamble: art and suicide; The Taste of Cherry: the charm of existing; and, finally, The Myth of Sisyphus: stubbornness and art; and a second part that documents the Artistic Project, which articulates with the subject of the research only insofar as it is in itself a positive impulse of creation, not intended to be a translation or illustration of these ideas
Books on the topic "Alert limits"
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Dru, Whitledge, ed. The safe motorists guide to speedtraps: State by state listings to keep drivers alert. Chicago: Bonus Books, 1991.
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Appleton, Brian. Appleton inquiry report: Report of an inquiry into health and safety aspects of stoppages caused by fire and bomb alerts on London Underground, British Rail and other mass transit systems. London: H.M.S.O., 1992.
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Office, General Accounting. Aviation safety: Weaknesses in inspection and enforcement limit FAA in identifying and responding to risks : report to Congressional requesters. Washington, D.C: The Office, 1998.
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L, Bissett Hallie, and CIRI Foundation, eds. Nae̓da: Our friends. 3rd ed. Anchorage, Alaska: The CIRI Foundation, 2008.
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Sayings, Sudoku. Sudoku Players Know No Limits: An Ideal Way to Help Keep the Brains of Both Young and Old Active and Alert While Also Being Fun to Play. Independently Published, 2019.
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Callaghan, Madeleine. ‘Painted fancy’s unsuspected scope’. Liverpool University Press, 2018. http://dx.doi.org/10.5949/liverpool/9781786940247.003.0001.
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This chapter readsQueen Mab, Poetical Essay on the Existing State of Things and the Esdaile Notebook as representative of the range and ambition of Shelley’s early poetry. Exploring the aesthetic power and pleasure embedded in these poems, this chapter explores Shelley’s poetic as well as his polemical faculty. Focusing on previously neglected works, the early work is shown to be deeply significant in its own right, not only for its later echoes in Shelley’s more mature poetry. Particular attention is paid to Shelley’s letter to Elizabeth Hitchener of 16 October 1811, where the performance of this letter sheds light upon the passionate ambition of Shelley’s early poetry. This chapter stresses Shelley’s burgeoning interest in artistry in his poetry and letters, revealing his early work as increasingly alert to the possibilities and the limits of language.
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Macauley, Robert C. Forgoing Life-Sustaining Medical Treatment (DRAFT). Edited by Robert C. Macauley. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199313945.003.0006.
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Forgoing life sustaining medical treatment takes on additional complexities depending on the mode of therapy forgone, which often varies in clinical practice. Compassionate extubation of the paralyzed or alert patient requires more in-depth ethical analysis. Some cardiologists are reluctant to deactivate pacemakers, requiring thoughtful comparison of these devices with implantable defibrillators, which do not prompt such debate. Dialysis is a burdensome intervention that may not prolong life and when instituted should be considered a time-limited trial. Enteral and parenteral nutrition create distinct issues in terms of emotional connotation, burden, and benefit.
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Newman, Mark. Models of network formation. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198805090.003.0013.
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This chapter describes models of the growth or formation of networks, with a particular focus on preferential attachment models. It starts with a discussion of the classic preferential attachment model for citation networks introduced by Price, including a complete derivation of the degree distribution in the limit of large network size. Subsequent sections introduce the Barabasi-Albert model and various generalized preferential attachment models, including models with addition or removal of extra nodes or edges and models with nonlinear preferential attachment. Also discussed are node copying models and models in which networks are formed by optimization processes, such as delivery networks or airline networks.
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Hawkes, Christopher H., Kapil D. Sethi, and Thomas R. Swift. Instant Neurological Diagnosis. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780190930868.001.0001.
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Experienced neurologists work fast. They ask few questions, maybe perform a brief examination, and they come up with the right answer. Sometimes they do neither and their conclusions are accurate—but how do they do it? This book holds the answers. The book is divided into 14 chapters which, for the most part, focus on a particular neurologic condition, namely: demyelination, headache, epilepsy and sleep, myopathy and motor neuron disorders, movement disorders, stroke, peripheral neuropathy, cerebellar ataxia, and dementia. The remaining chapters are concerned with the clinician’s initial impressions (first encounters), cranial nerves, limbs and trunk, spinal lesions, and cerebrospinal fluid. At the end of each chapter is a summary of the salient points and a few key references. The final chapter relates to the fast neurological examination. Most diagnostic clues or “Handles” are illustrated by a table, figure, or video clip to reinforce a particular message, and the text is marked with Red Flags that the clinician must be alert for.
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Friesen, Max, and Owen Mason, eds. The Oxford Handbook of the Prehistoric Arctic. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199766956.001.0001.
Full textAbstract:
The North American Arctic was one of the last regions on Earth to be settled by humans, due to its extreme climate, limited range of resources, and remoteness from populated areas. Despite these factors, it holds a rich and complex history relating to Inuit, Iñupiat, Inuvialuit, Yupik, and Aleut peoples and their ancestors. The artifacts, dwellings, and food remains of these ancient peoples are remarkably well preserved due to cold temperatures and permafrost, allowing archaeologists to reconstruct their lifeways with great accuracy. Furthermore, the combination of modern Elders’ traditional knowledge with the region’s high-resolution ethnographic record allows past peoples’ lives to be reconstructed to a level simply not possible elsewhere. Combined, these factors yield an archaeological record of global significance—the Arctic provides ideal case studies relating to issues as diverse as the impacts of climate change on human societies, the complex process of interaction between indigenous peoples and Europeans, and the dynamic relationships between environment, economy, social organization, and ideology in hunter-gatherer societies. In this book, each Arctic cultural tradition is described in detail, with up-to-date coverage of recent interpretations of all aspects of their lifeways. Additional chapters cover broad themes applicable to the full range of arctic cultures, such as trade, stone tool technology, ancient DNA research, and the relationship between archaeology and modern arctic communities. The resulting volume, written by the region’s leading researchers, is by far the most comprehensive coverage of North American arctic archaeology ever assembled.
Book chapters on the topic "Alert limits"
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Jakkhupan, Worapot. "A Prototype of Mobile Speed Limits Alert Application Using Enhanced HTML5 Geolocation." In Computational Collective Intelligence. Technologies and Applications, 312–21. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11289-3_32.
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Moonan, Lawrence. "Albert the Great, and Some Limits of Scientifical Inquiry." In Historia Philosophiae Medii Aevi, 695–710. Amsterdam: B.R. Grüner Publishing Company, 1992. http://dx.doi.org/10.1075/zg.142.41moo.
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Meng, Qian, Li-Ta Hsu, and Shaojun Feng. "Online Integrity Alert Limit Determination Method for Autonomous Vehicle Navigation." In Lecture Notes in Electrical Engineering, 696–706. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3711-0_62.
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Loh, Kah Seng. "Albert Winsemius and the Transnational Origins of High Modernist Governance in Singapore." In The Limits of Authoritarian Governance in Singapore's Developmental State, 71–91. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-1556-5_4.
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Gipson, Ilene K., and Mary Ann Stepp. "Anatomy and Cell Biology of the Cornea, Superficial Limbus, and Conjunctiva." In Albert and Jakobiec's Principles and Practice of Ophthalmology, 1–29. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-90495-5_202-1.
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Gipson, Ilene K., and Mary Ann Stepp. "Anatomy and Cell Biology of the Cornea, Superficial Limbus, and Conjunctiva." In Albert and Jakobiec's Principles and Practice of Ophthalmology, 3–30. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-42634-7_202.
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Wilson, James D. "Selecting Alert/Action Limits for Environmental Monitoring Programs." In Sterilization of Medical Devices, 279–82. Routledge, 2018. http://dx.doi.org/10.1201/9780203738306-36.
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Weisser, Marc-Antoine, Joanna Tomasik, and Dominique Barth. "Exploiting the Inter-Domain Hierarchy for the QoS Network Management." In Intelligent Quality of Service Technologies and Network Management, 239–55. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-61520-791-6.ch013.
Full textAbstract:
The Internet is an interconnection of multiple networks called domains. Inter-domain routing is ensured by BGP which preserves each domain’s independence and announces routes arbitrarily chosen by domains. BGP messages carry no information concerning quality parameters of announced routes. The authors’ goal is to provide domains with information regarding the congestion state of other domains without any changes in BGP. A domain, which is aware of heavily congested domains, can choose a bypass instead of a route exhibiting possible problems with QoS satisfaction. They propose a mechanism which sends alert messages in order to notify domains about the congestion state of other domains. The major difficulty consists in avoiding flooding the Internet with signaling messages. The authors’ solution limits the number of alerts by taking advantage of the hierarchical structure of the Internet set by P2C and P2P relationships. Their algorithm is distributed and heuristic because it is a solution to an NP-complete and inapproximable problem. They prove these properties by reducing the Steiner problem in directed acyclic graphs to our problem of alert diffusion. The simulations show that our mechanism significantly diminishes the number of unavailable domains and routes compared to those obtained with BGP routing and with a theoretical centralized mechanism.
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Calogero, Rachel M., Tracy L. Tylka, and Jaclyn A. Siegel. "Personal Safety as Bedrock and Safeguard for Positive Embodiment." In Handbook of Positive Body Image and Embodiment, edited by Tracy L. Tylka and Niva Piran, 139–48. Oxford University Press, 2019. http://dx.doi.org/10.1093/med-psych/9780190841874.003.0014.
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Personal safety is a pillar of positive embodiment. Yet, women’s personal safety is continuously threatened within environments that promote or excuse the sexual objectification of women via prompting vigilant policing of women’s safety, which fragments their consciousness, restricts their movement, and limits their freedom. This chapter begins by discussing the safety threats of sexual objectification, whereby the omnipresent threat and perpetration of violence against women by men keep them in a state of fear and alert to their more vulnerable status. Next, the chapter considers how the disruptive, and terrorizing, nature of sexual objectification limits women’s positive embodiment (e.g., restricts voluntary movement, adds to psychological distress, creates a hyperawareness and anxiety about safety), and presents research that uphold these links. The chapter ends with considering ways of claiming space in the world and the imperative for cultivating women’s safety through social activism and embodied social change.
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Akremi, Aymen, Hassen Sallay, and Mohsen Rouached. "Intrusion Detection Systems Alerts Reduction." In Security and Privacy Management, Techniques, and Protocols, 255–75. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5583-4.ch010.
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Investigators search usually for any kind of events related directly to an investigation case to both limit the search space and propose new hypotheses about the suspect. Intrusion detection system (IDS) provide relevant information to the forensics experts since it detects the attacks and gathers automatically several pertinent features of the network in the attack moment. Thus, IDS should be very effective in term of detection accuracy of new unknown attacks signatures, and without generating huge number of false alerts in high speed networks. This tradeoff between keeping high detection accuracy without generating false alerts is today a big challenge. As an effort to deal with false alerts generation, the authors propose new intrusion alert classifier, named Alert Miner (AM), to classify efficiently in near real-time the intrusion alerts in HSN. AM uses an outlier detection technique based on an adaptive deduced association rules set to classify the alerts automatically and without human assistance.
Conference papers on the topic "Alert limits"
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Kigotho, Olivier N., and Jason H. Rife. "Comparison of Rectangular and Elliptical Alert Limits for Lane-Keeping Applications." In 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021). Institute of Navigation, 2021. http://dx.doi.org/10.33012/2021.17904.
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Hsu, Yung-Hsiang (Judy), and J. Christian Gerdes. "Stabilization of a Steer-by-Wire Vehicle at the Limits of Handling Using Feedback Linearization." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81203.
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As a vehicle approaches the limits of handling (the operating region defined by the peak lateral tire force), the vehicle response may be oscillatory or unstable. This paper develops a control system to allow the driver to approach the limits of handling safely. The control algorithm uses a new method that applies recent advances in vehicle sensing to estimate tire cornering stiffness and coefficient of friction in real-time. The controller employs state feedback linearization to cancel nonlinearities in the system using steer-by-wire steering inputs. Once the lateral force surpasses a threshold value, the driver steering input is saturated to keep the vehicle in the linearizable handling region and to alert the driver of approaching limits. Simulation results and preliminary experimental work performed on a steer-by-wire research vehicle demonstrate the potential benefits of this control system.
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Goldsmith, Brittany, Elizabeth Foyt, and Madhu Hariharan. "The Role of Offshore Monitoring in an Effective Deepwater Riser Integrity Management Program." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29479.
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As offshore field developments move into deeper water, one of the greatest challenges is in designing riser systems capable of overcoming the added risks of more severe environments, complicated well requirements and uncertainty of operating conditions. The failure of a primary riser component could lead to unacceptable consequences, including environmental damage, lost production and possible injury or loss of human life. Identification of the risks facing riser systems and management of these risks are essential to ensure that riser systems operate without failure. Operators have recognized the importance of installing instrumentation such as global positioning systems (GPS), vessel motion measurement packages, wind and wave sensors and Acoustic Doppler Current Profiler (ADCP) units to monitor vessel motions and environmental conditions. Additionally, high precision monitoring equipment has been developed for capturing riser response. Measured data from these instruments allow an operator to determine when the limits of acceptable response, predicted by analysis or determined by physical limitations of the riser components, have been exceeded. Regular processing of measured data through automated routines ensures that integrity can be quickly assessed. This is particularly important following extreme events, such as a hurricane or loop current. High and medium alert levels are set for each parameter, based on design analysis and operating data. Measured data is compared with these alert levels, and when an alert level is reached, further response evaluation or inspection of the components in question is recommended. This paper will describe the role of offshore monitoring in an integrity management program and discuss the development of alert levels based on potential failure modes of the riser systems. The paper will further demonstrate how this process is key for an effective integrity management program for deepwater riser systems.
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Quigley, Conor, and Dara Williams. "A Revised Methodology for the Calculation of MODU Watch Circles." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41230.
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As the industry continues to push the boundaries of offshore exploration into deeper water depths and harsher environments there is an increased need to ensure the integrity of both the drilling riser and wellhead in the event of loss of station-keeping in dynamically positioned (DP) rigs. In order to determine vessel limiting operating/alert offsets it is necessary to carry out a vessel drift-off analysis which predicts the vessel drift-off speed and direction in the event of a DP failure. This analysis is typically performed for a limited combination of environmental conditions (usually collinear wind, wave and current) and will generally assume a vessel position that is directly above the wellhead. Whilst the results of the standard drift-off analysis, and associated drift-off plots, are useful in determining expected drift-off speed and feasibility of the emergency disconnect sequence (EDS), the outputs are of little operational use to the rig personnel in determining allowable operational/alert offsets for day to day operations. As the vessel is rarely located directly above the wellhead and environmental conditions can vary significantly in both direction and magnitude over the drilling campaign a more comprehensive analysis methodology and set of load cases is required in order to develop useful inputs to the well specific operating guidelines (WSOG). The current standard industry approach is to generate drilling riser operability envelopes independently of drift-off curves and thus recommended operating offsets do not account for drift-off speed, reaction times or EDS times. This can lead to a potential lack of conservatism in WSOG. In order to avoid this lack of conservatism in calculation of operating offsets a coupled steady-state/transient response analysis approach is required to ensure that a DP failure event at limiting operational offset does not lead to damage to the wellhead or riser system. A new revised methodology for the calculation of allowable operating windows and associated alert offsets is presented in this paper. This new methodology couples both the steady state operating limits of the vessel and the transient system response during a drift-off, due to DP failure, in order to present a comprehensive go/no-go operability chart of allowable offset vs. environment for use as input to the WSOG.
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Jain, A., A. Morgenthal, M. Aman, M. Horton, and S. Khan. "Creating an Auto-Encoder Based Predictive Maintenance Tool for Offshore Annulus Wells." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210220-ms.
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Abstract Objectives/Scope A key component of well integrity is annular integrity. Much of the focus on this has been on establishing maximum and minimum pressure limits and designing envelopes under various well conditions encountered during well construction and subsequent production and injection operations. Many operators have established systems for operating wells within this design envelope to monitor for pressure excursions. However, abnormal annulus pressure behavior within the design envelope could be overlooked using a system that relies on limit monitoring and excursions. Methods, Procedures, Process We propose a modeling workflow that combines novel deep learning techniques with statistical analysis to create online models which predict potential asset failures and alert on abnormal behavior such as abrupt pressure build up in producer and water injection wells’ A-Annulus. The model uses autoencoder architecture to learn the behavior of the wells during normal operating periods and generates alerts when it encounters new or abnormal behavior. The autoencoder architecture outputs a risk score aggregated over the residuals from all input features. Sequential Probability Ratio Test (SPRT) is performed on the risk score to determine abnormal regime during operation to raise alerts. These alerts can be used for root cause analysis based on the top contributors to the risk score. In our approach, we use feature thresholds as filters to determine normal operating periods for training the model. To simulate live conditions during model training, the historical time series data is divided into training and prediction windows. The model is trained on each training window and risk scores are created for the prediction window using a sliding window technique. To find the optimum model, a grid search is performed over a wide distribution of autoencoder and SPRT hyper-parameters. The models are scored based on recall, precision and lead time provided before a failure. Results, Observations, Conclusions We demonstrate this workflow using annulus pressure, downhole pressure, upstream choke pressure and upstream choke temperature as input to the model. The model does not require the physical properties of a well but uses historic well data lending itself to be applicable to already existing well stock. Next, we demonstrate using engineered features and synthesized data to efficiently train and score the models. During our experiments, we have explored several engineered features across multiple platforms and found that the correct set of engineered features can deliver a model that accurately alerts on asset abnormalities and potential failures. Novel/Additive Information Our approach combines the strengths of deep learning techniques, statistical analytics and subject matter expertise to provide a framework that has demonstrated efficient scaling across multiple assets and sites and has potential application on a variety of oil and gas equipment.
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Sahu, Sambit Kumar, Christophe Lauwerys, Zulfikri Abdullah, Mariana Jamil Muhammad, and Divya Agrawal. "Journey of Effectively Using Real-Time Production Surveillance Tool in Digital Transformation and Well, Reservoir and Facility Management Improvements." In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205623-ms.
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Abstract In 2014, SPE-167857-MS was published highlighting how Real-Time Surveillance using the Shell proprietary Production Universe (PU) application helped to reduce deferment, improve production allocation, optimize test unit capacity, and track well operating envelope in Brunei Shell Petroleum BSP (company) operations in South East Asia. Since then, there has been significant progress in the application of PU to help the company meet Wells Reservoir Management (WRFM) requirements and Operational Excellence standards in areas such as Platform Production Reconciliation, Well Modeling, Production Estimation, and Exception based Surveillance helping the company to improve their Hydrocarbon and Energy Accounting. The wider introduction of the PU application in the allocation process significantly helped in Hydrocarbon Accounting (HCA), helping company's journey in moving from monthly to daily allocation and assisting to improve the field reconciliation factor (RF). The utilization of PU has also facilitated real-time monitoring of production parameters supporting engineers to safely and efficiently operate their wells within the Operating Envelopes while adhering to reservoir management guidelines. The optimization engine of the PU has been used to maximize the production of company contributing to two major success stories of Real-Time Condensate Optimization in a Gas-Constraint system and Gas Lift Optimization in a platform with limited lift gas availability amongst the producing wells. An Integrated Production Monitoring and Optimization System (IPMOS) provides asset-wide advice on optimally producing company's well within the constraints imposed by limitations on pipeline capacity, compressor throughput, and remote operability while satisfying customer demands. PU is additionally being used in Proactive Technical Monitoring (PTM) of rotating equipment to identify the critical parameters operating outside the set limits in an exception-based format. PU alerts & alarms have been configured in a wide range of operational monitoring such as Ensure Safe Production (ESP), Chemical Injection, Annulus Pressure Monitoring(APM), Control-Line pressure, Erosion-Corrosion Monitoring System(ECMS) to alert Production Engineers in case of any discrepancy or exception-based format for them to take remedial actions. This paper will explain how each of the above applications in PU has helped company in its journey of closing its gap to potential and achieving the digital transformation of its operations.
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Walters, Trey W., and Robert A. Leishear. "When the Joukowsky Equation Does Not Predict Maximum Water Hammer Pressures." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84050.
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The Joukowsky equation has been used as a first approximation for more than a century to estimate water hammer pressure surges. However, this practice may provide incorrect, non-conservative, pressure calculations under several conditions. These conditions are typically described throughout fluid transient text books, but a consolidation of these issues in a brief paper seems warranted to prevent calculation errors in practice and to also provide a brief understanding of the limits and complexities of water hammer equations. To this end, various issues are discussed here that result in the calculation of pressures greater than those predicted by the Joukowsky equation. These conditions include reflected waves at tees, changes in piping diameter, and changes in pipe wall material, as well as frictional effects referred to as line pack, and the effects due to the collapse of vapor pockets. In short, the fundamental goal here is to alert practicing engineers of the cautions that should be applied when using the Joukowsky equation as a first approximation of fluid transient pressures.
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Jasem, Mohammed, Oka Fabian, Graeme Dawson, Madhukar Silari, Bader Al Junaibi, Srinvisa Challagundla, Steven Noble, et al. "Transforming Production Phase WIMS to a Game Changer Smart Well Integrity Monitoring System with Real Time Automated Engineering Analytics." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211537-ms.
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Abstract First implementation of a new well integrity management solution with integrated and automated workflows, the Well Integrity Management solution (WIMS) that helps company to minimize risks and production loss by the real-time monitoring of the operating limits of sour gas wells. Leveraging digital twin technology, the new software enables engineers to rapidly identify high-risk wells, take corrective actions faster, and mitigate issues to maximize well availability. Previously, the process of monitoring well integrity was based on the multiple software applications which is time-consuming. To address the challenge, we developed a WIMS coupled with the well engineering analysis approach. The system achieves the following: Representative and accurate well barrier equipment inventory for the entire asset.Safely operate critical HPHT wells to their maximum potential,Eliminate critical and costly barrier failures while minimizing production interruption through automated workflows and alert triggers,Free SMEs to perform critical well integrity management tasks, including technical reviews of sensitivity analysis that determine more accurate MAASP/MAWOP values,Track corporate KPIs and report regulatory requirements effectively. WIMS integrates source system for the well engineering applications. A first-of-its kind, WIMS uses Real Time engineering analytics and artificial intelligence to run as a Digital Twin for well's Operating Limits and diagnoses potential failures. It also measures, reports and displays most realistic well integrity status for the wells, based on company well integrity standards, processes and best practices. This paper details how we were able to successfully address these challenges which encouraged us mutually to work towards further integration with engineering tools and more automation of WIMS processes. Important Note: All well data, engineering analysis, operating limits and well information etc., displayed or referred to in this publication, are not necessarily actual and only used for illustration purposes.
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O’Sullivan, Enda, Julian Soles, and Michel Dib. "Fully Coupled EDS/Drift-Off Analysis for a Harsh Environment, Deepwater Site." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51631.
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In support of a well drilled in the Great Australian Bight (GAB) by the Glomar Jack Ryan dynamically-positioned (DP) drillship in 4308 feet of water in early 2003, drift-off riser analysis was carried out to establish “alert” offsets for the emergency disconnect sequence (EDS). Drift-off analysis of the vessel/riser system is a key element to the successful management of the riser on a DP drillship, as it deals with protecting the equipment in case of the potential loss of vessel power. At this well site, high seastates combined with wind and current conditions dictate that drilling should be carried out in accordance with “well-specific operating criteria” (WSOC). These criteria assist the crew by identifying the metocean conditions that limit various operations. Analysis of the drilling riser was carried out for drift-off, hang-off and recoil scenarios to establish certain criteria to avoid exceedence of allowable limits in the riser and conductor pipe. The novel aspect of this drift-off analysis is the use of a fully-coupled, time-domain, finite element solution. The fully-coupled aspect of this solution models the vessel / tensioner system / riser / LMRP / BOP / wellhead / conductor / soil interaction process more accurately and thus allows for less conservativism when compared to uncoupled solution methods. This enables the rig to work in areas that might otherwise be considered marginal due to the anticipated time spent waiting on weather.
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Darabi, F. "A quantum cosmology with dual classical limits." In ALBERT EINSTEIN CENTURY INTERNATIONAL CONFERENCE. AIP, 2006. http://dx.doi.org/10.1063/1.2399669.
Full textReports on the topic "Alert limits"
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Albert, James, Carina Hoorn, Yadvinder Malhi, Oliver Phillips, Andrea C. Encalada, Hans ter Steege, John Melack, et al. The multiple viewpoints for the Amazon: geographic limits and meanings. UN Sustainable Development Solutions Network (SDSN), September 2021. http://dx.doi.org/10.55161/hkfz7577.
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The geographic term “Amazon” describes several distinct but overlapping hydrological, geological, biological, and geopolitical entities located in northern South America (Albert et al. 2018). It is therefore useful to distinguish the Amazon as a drainage basin, a sedimentary basin, a biodiversity province, and a geopolitical unit. This report describes the multiple boundaries and definitions of the geographical area called "the Amazon".
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Turner, Paul, and John O'Brien. Review of the FSA’s research programme on food hypersensitivity. Food Standards Agency, June 2021. http://dx.doi.org/10.46756/sci.fsa.bka542.
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The overarching mission of the Food Standards Agency (FSA) is tothe ensure that food is safe, food is what it says it is and that consumers can make informed choices about what to eat. These are of central importance to consumers with food hypersensitivity(FHS).Food hypersensitivity (FHS) encompasses both immune-mediated food hypersensitivity (food allergy and coeliac disease) and non-immune food intolerances. FHS is a complex, multifactorial disease of concern to multiple stakeholders including consumers with FHS, their families, clinicians, regulatory agencies and policy makers, scientists, food manufacturers and food business operators. It affects around 5-8% of children and 2-3% of adults in the UK, and although rare, can be fatal. Public concern over FHS has grown in recent years. In the UK and elsewhere, food recalls due to the presence of undeclared allergens feature predominantly in food alerts; legislation over food labelling has become clearer, and consumers and producers are more aware of FHS. The FSA has been a major funder of research into FHS for over 2 decades, and the outputs of the research programme has had significant impacts at a national and global scale, most notably in the area of the prevention of FHS in children and the presence of declared and undeclared allergens in food products. Strengthening protections for consumers with FHS is a top priority for the FSA. The FSA has established a Food Hypersensitivity Programme Board to oversee and coordinate its work in this area. The working group was tasked with reviewing the research into FHS supported by the Food Standards Agency to date, and prioritising those priority areas where the current scientific evidence is limited and therefore should be a focus for future research investment. The aim –to make the UK the best country in the world for consumers with food hypersensitivity.