Bibliographies thématiques / Stiff source

Littérature scientifique sur le sujet « Stiff source »

Auteur : Grafiati

Publié le 11 mars 2023

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Sommaire

Articles de revues
Thèses
Livres
Chapitres de livres
Actes de conférences
Rapports d'organisations

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Stiff source ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "Stiff source"

Altschuler, Eric. « Stiff shirts a source of inspiration ». Nature 543, n^o 7644 (mars 2017) : 179. http://dx.doi.org/10.1038/543179e.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Lorin, E., et V. Seignole. « Convection Systems with Stiff Source Terms ». Mathematical Models and Methods in Applied Sciences 13, n^o 07 (juillet 2003) : 971–1018. http://dx.doi.org/10.1142/s0218202503002799.

Texte intégral

Résumé :

The aim of this paper is the numerical treatment of some convection systems with stiff relaxation source-terms. We will first define the notion of stiffness for such systems and will select some prototypical and physical problems. We will introduce a new numerical method in order to solve accurately this type of systems. Numerical comparisons will be performed on the evoked problems.

Styles APA, Harvard, Vancouver, ISO, etc.

Kumar, Chandan, et Mahesh K. Mishra. « A Multifunctional DSTATCOM Operating Under Stiff Source ». IEEE Transactions on Industrial Electronics 61, n^o 7 (juillet 2014) : 3131–36. http://dx.doi.org/10.1109/tie.2013.2276778.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Xu, Hongmei, et Weike Wang. « A linear hyperbolic system with stiff source terms ». Wuhan University Journal of Natural Sciences 12, n^o 2 (mars 2007) : 207–10. http://dx.doi.org/10.1007/s11859-006-0030-4.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Yong, Wen-an. « Boundary conditions for hyperbolic systems with stiff source terms ». Indiana University Mathematics Journal 48, n^o 1 (1999) : 0. http://dx.doi.org/10.1512/iumj.1999.48.1611.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Svärd, Magnus, et Siddhartha Mishra. « Implicit–explicit schemes for flow equations with stiff source terms ». Journal of Computational and Applied Mathematics 235, n^o 6 (janvier 2011) : 1564–77. http://dx.doi.org/10.1016/j.cam.2010.08.015.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

KARLSEN, K. H., N. H. RISEBRO et J. D. TOWERS. « FRONT TRACKING FOR SCALAR BALANCE EQUATIONS ». Journal of Hyperbolic Differential Equations 01, n^o 01 (mars 2004) : 115–48. http://dx.doi.org/10.1142/s0219891604000068.

Texte intégral

Résumé :

We propose and prove convergence of a front tracking method for scalar conservation laws with source term. The method is based on writing the single conservation law as a 2×2 quasilinear system without a source term, and employ the solution of the Riemann problem for this system in the front tracking procedure. In this way the source term is processed in the Riemann solver, and one avoids using operator splitting. Since we want to treat the resonant regime, classical arguments for bounding the total variation of numerical solutions do not apply here. Instead compactness of a sequence of front tracking solutions is achieved using a variant of the singular mapping technique invented by Temple [69]. The front tracking method has no CFL-condition associated with it, and it does not discriminate between stiff and non-stiff source terms. This makes it an attractive approach for stiff problems, as is demonstrated in numerical examples. In addition, the numerical examples show that the front tracking method is able to preserve steady-state solutions (or achieving them in the long time limit) with good accuracy.

Styles APA, Harvard, Vancouver, ISO, etc.

Mishra, Mahesh K., Arindam Ghosh et Avinash Joshi. « Load compensation for systems with non-stiff source using state feedback ». Electric Power Systems Research 67, n^o 1 (octobre 2003) : 35–44. http://dx.doi.org/10.1016/s0378-7796(03)00083-x.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Miniati, Francesco, et Phillip Colella. « A modified higher order Godunov’s scheme for stiff source conservative hydrodynamics ». Journal of Computational Physics 224, n^o 2 (juin 2007) : 519–38. http://dx.doi.org/10.1016/j.jcp.2006.10.008.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Herty, Michael, et Hui Yu. « Feedback boundary control of linear hyperbolic equations with stiff source term ». International Journal of Control 91, n^o 1 (23 janvier 2017) : 230–40. http://dx.doi.org/10.1080/00207179.2016.1276635.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Thèses sur le sujet "Stiff source"

Nguyen, Thi Hoai Thuong. « Numerical approximation of boundary conditions and stiff source terms in hyperbolic equations ». Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S027.

Texte intégral

Résumé :

Ce travail est consacré à l’étude théorique et numérique de systèmes hyperboliques d’équations aux dérivées partielles et aux équations de transport, avec des termes de relaxation et des conditions aux bords. Dans la première partie, on étudie la stabilité raide d’approximations numériques par différences finies du problème mixte donnée initiale-donnée au bord pour l’équation des ondes amorties dans le quart de plan. Dans le cadre du schéma discret en espace, nous proposons deux méthodes de discrétisation de la condition de Dirichlet. La première est la technique de sommation par partie et la seconde est basée sur le concept de condition au bord transparente. Nous proposons également une comparaison numérique des deux méthodes, en particulier de leur domaine de stabilité. La deuxième partie traite de schémas numériques d’ordre élevé pour l’équation de transport avec une donnée entrante sur domaine borné. Nous construisons, implémentons et analysons la procédure de Lax-Wendroff inverse au bord entrant. Nous obtenons des taux de convergence optimaux en combinant des estimations de stabilité précises pour l’extrapolation des conditions au bord avec des développements de couche limite numérique. Dans la dernière partie, nous étudions la stabilité de solutions stationnaires pour des systèmes non conservatifs avec des termes géométrique et de relaxation. Nous démontrons que les solutions stationnaires sont stables parmi les solutions entropique processus, qui généralisent le concept de solutions entropiques faibles. Nous supposons essentiellement que le système est complété par une entropie partiellement convexe et que, selon la dissipation du terme de relaxation, la stabilité ou la stabilité asymptotique des solutions stationnaires est obtenue
The dissertation focuses on the study of the theoretical and numerical analysis of hyperbolic systems of partial differential equations and transport equations, with relaxation terms and boundary conditions. In the first part, we consider the stiff stability for numerical approximations by finite differences of the initial boundary value problem for the linear damped wave equation in a quarter plane. Within the framework of the difference scheme in space, we propose two methods of discretization of Dirichlet boundary condition. The first is the technique of summation by part and the second is based on the concept of transparent boundary conditions. We also provide a numerical comparison of the two numerical methods, in particular in terms of stability domain. The second part is about high order numerical schemes for transport equations with nonzero incoming boundary data on bounded domains. We construct, implement and analyze the so-called inverse Lax-Wendroff procedure at incoming boundary. We obtain optimal convergence rates by combining sharp stability estimate for extrapolation boundary conditions with numerical boundary layer expansions. In the last part, we study the stability of stationary solutions for non-conservative systems with geometric and relaxation source term. We prove that stationary solutions are stable among entropy process solution, which is a generalisation of the concept of entropy weak solutions. We mainly assume that the system is endowed with a partially convex entropy and, according to the entropy dissipation provided by the relaxation term, stability or asymptotic stability of stationary solutions is obtained

Styles APA, Harvard, Vancouver, ISO, etc.

Hillyard, Cinnamon. « Construction and Analysis of a Family of Numerical Methods for Hyperbolic Conservation Laws with Stiff Source Terms ». DigitalCommons@USU, 1999. https://digitalcommons.usu.edu/etd/7120.

Texte intégral

Résumé :

Numerical schemes for the partial differential equations used to characterize stiffly forced conservation laws are constructed and analyzed. Partial differential equations of this form are found in many physical applications including modeling gas dynamics, fluid flow, and combustion. Many difficulties arise when trying to approximate solutions to stiffly forced conservation laws numerically. Some of these numerical difficulties are investigated. A new class of numerical schemes is developed to overcome some of these problems. The numerical schemes are constructed using an infinite sequence of conservation laws. Restrictions are given on the schemes that guarantee they maintain a uniform bound and satisfy an entropy condition. For schemes meeting these criteria, a proof is given of convergence to the correct physical solution of the conservation law. Numerical examples are presented to illustrate the theoretical results.

Styles APA, Harvard, Vancouver, ISO, etc.

Le, Mellec Anne. « The canopy as source for dissolved and particulate organic matter (DOM, POM) - with a focus on mass outbreaks of phytophagous insects / ». Aachen : Shaker, 2009. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=018961097&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Le, Mellec Anne. « The canopy as source for dissolved and particulate organic matter (DOM, POM) - with a focus on mass outbreaks of phytophagous insects ». Aachen Shaker, 2008. http://d-nb.info/997950358/04.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Chen, Stephanie, Lindsey Hall et John E. Murphy. « Perceived Level and Sources of Stress in Pharmacy Administrators, Faculty and Staff ». The University of Arizona, 2011. http://hdl.handle.net/10150/614600.

Texte intégral

Résumé :

Class of 2011 Abstract
OBJECTIVES: To analyze the levels and sources of stress and to identify demographics related to stress prevalent in administrators, faculty and staff at the University of Arizona, College of Pharmacy. METHODS: A stress questionnaire was designed and administered to 171 administrators, faculty and staff at the University of Arizona, College of Pharmacy. The dependent variables were sources of stress and total stress levels. The independent demographic variables were sex, marital status, tenure status and percentage of time involved with student interaction. RESULTS: Questionnaires were completed by 11 administrators, 28 faculty and 27 staff. Faculty reported significantly more stress from participation in committees and negative interactions with college personnel compared to staff (p=0.03, p=0.02 respectively). Staff reported significantly more stress from uncertainty about job security compared to faculty (p=0.02). Females reported significantly higher levels of stress in influencing departmental decisions, resolving differences with supervisors and uncertainty about job security (p=0.03, p=0.002, p=0.04 respectively) compared to males. Inadequate salary was reported as significantly more stressful for faculty who are tenure-eligible but not tenured yet compared to staff (p=0.046). CONCLUSION: Overall, administrators, faculty and staff experienced slight to moderate stress levels. Administrators, faculty and staff shared some similarities and differences in levels and sources of stress with few significant differences. In addition, there was little difference among the groups based on the demographic identifiers explored.

Styles APA, Harvard, Vancouver, ISO, etc.

Struck, Carol L. Lynn Mary Ann Brickell John L. « A study of staff perceptions of the source for instructional leadership in a central Illinois school district ». Normal, Ill. Illinois State University, 1987. http://wwwlib.umi.com/cr/ilstu/fullcit?p8726510.

Texte intégral

Résumé :

Thesis (Ed. D.)--Illinois State University, 1987.
Title from title page screen, viewed August 18, 2005. Dissertation Committee: Mary Ann Lynn, John L. Brickell (co-chairs), Robert L. Arnold, George Padavil, Paula J. Smith. Includes bibliographical references (leaves 115-117) and abstract. Also available in print.

Styles APA, Harvard, Vancouver, ISO, etc.

Tomi, Kovačević. « Синдром сагоревања код здравствених радника који се баве лечењем болесника оболелих од респираторних болести ». Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114778&source=NDLTD&language=en.

Texte intégral

Résumé :

Sindrom sagorevanja, eng. Burnout Syndrome (BOS) je oblik profesionalnog stresa koji se najčešće javlja u zanimanjima koja podrazumevaju direktan kontakt sa ljudima, a nastaje kao odgovor na hroničan stres. Ogleda se kroz aspekte: emocionalne iscrpljenosti eng. Emotional Exhaustion (EE), depersonalizacije eng. Depersonalisation (DP) i osećaja smanjenog ličnog postignića eng. Personal Accomplishment (PA). Sprovedena istraživanja ukazuju na visoku zastupljenost BOS-a kod zdravstvenih radnika i njegovu zavisnost ne samo od ličnih karakteristika nego i od mnogobrojnih faktora na poslu. Dokazano je da BOS dovodi do posledica kako na individualnom, tako i na organizacionom nivou. Usled oštećenja fizičkog i psihičkog zdravlja lekara i medicinskih sestara/tehničara indirektno dolazi i do smanjenja nivoa zdravstvene usluge sa svim svojim posledicama po zdravstveni sistem i zdravlje pacijenata. Ovo istraživanje imalo je za cilj da ispita zastupljenost BOS-a kod zdravstvenih radnika koji se bave lečenjem obolelih od respiratornih bolesti, utvrdi da li postoji razlika u zastupljenosti BOS-a u odnosu na nivo edukacije (lekari i medicinske sestre/tehničari) i u odnosu na radno mesto (zbrinjavanje bolesnika koji boluju od neizlečivih (terminalnih) u odnosu na zbrinjavanje bolesnika koji boluju od izlečivih (kurabilnih). plućnih bolesti. Istraživanje je sprovedeno među zaposlenim zdravstvenim radnicima u Institutu za plućne bolesti Vojvodine u Sremskoj Кamenici u periodu april-jun 2019. godine kao studija poprečnog preseka. Podaci istraživanja su prikupljeni pomoću sledećih upitnika: Upitnik o socio-demografskim karakteristikama ispitanika, Maslač inventar izgaranja (MBI), Skala izgaranja izvedene iz Kopenhagen inventara izgaranja – srpska verzija (SI), Upitnik opšteg zdravlja (UOZ-12) i Upitnik o stresorima na radnom mestu, zadovoljstvu na poslu i motivaciji i opuštanju nakon posla. Istraživanjem je obuhvaćeno 165 zdravstvena radnika: 64 (38.8%) lekara i 101 (61.2%) medicinskih sestara/tehničara. BOS je utvrđen kod 47% ispitanika. Visoki stepen EE potvrđen je kod 43.0%, visok stepen DP kod 21.8%, a nizak stepen PA kod 32.1% ispitanih. Statistički značajna razlika u zastupljenosti nije dokazana u odnosu na stepen stručne spreme (40.6% vs. 51.5%) niti u odnosu na radno mesto (45.3% vs. 48.2%). Nema statistički značajne razlike u zastupljenosti BOS-a u odnosu na socio-demografske karakteristike ispitanika. Psihički distres prisutan je kod 30.8% zdravstvenih radnika sa potvrđenim BOS-om. Pokazana je statistički značajna razlika u povezanosti BOS-a i psihičkog distresa i u odnosu na stepen stručne spreme (p=0.000) i u odnosu na radno mesto (p=0.000), a ova povezanost je izraženija kod medicinskih sestara/tehničara (p=0.000). Značajna korelacija nije nađena samo između dva pretpostavljena stresora i BOS-a: prekovremenog rada i nedostatka odgovarajuće kontinuirane edukacije. Statistički značajna je i korelacija između svih domena BOS-a i ukupnog zadovoljstva radnim okruženjem. (EE p=0.000, DP p=0.000 i PA p=0.000). Trećina ispitanika sa potvrđenim BOS-om razmišlja o promeni zanimanja, a njih 41% o promeni radnog mesta. Sindrom sagorevanja kod zdravstvenih zdravstvenih radnika koji se bave lečenjem obolelih od respiratornih bolesti zastupljen je u visokom procentu. BOS značajno korelira sa psihičkim distresom, a ova povezanost je izraženija u populaciji medicinskih sestara. Nema statistički značajne razlike u zastupljenosti BOS-a u odnosu na nivo edukacije, niti u odnosu na radno mesto. Izražena je kompleksnost, varijabilnost i različitost u zastupljenosti pretpostavljenih stresora na poslu. Neophodnost otkrivanja stresogenih faktora i donošenje mera sa ciljem njihovog sprečavanja i/ili ublažavanja je nesumnjiva. Unapređenje edukacije radi prepoznavanja BOS-a i prevazilaženju stresogenih faktora kao i iznalaženje novih organizacionih šema u cilju eliminacije stresora na poslu trebalo bi da budu jedni od prioriteta svake zdravstvene institucije.
Sindrom sagorevanja, eng. Burnout Syndrome (BOS) je oblik profesionalnog stresa koji se najčešće javlja u zanimanjima koja podrazumevaju direktan kontakt sa ljudima, a nastaje kao odgovor na hroničan stres. Ogleda se kroz aspekte: emocionalne iscrpljenosti eng. Emotional Exhaustion (EE), depersonalizacije eng. Depersonalisation (DP) i osećaja smanjenog ličnog postignića eng. Personal Accomplishment (PA). Sprovedena istraživanja ukazuju na visoku zastupljenost BOS-a kod zdravstvenih radnika i njegovu zavisnost ne samo od ličnih karakteristika nego i od mnogobrojnih faktora na poslu. Dokazano je da BOS dovodi do posledica kako na individualnom, tako i na organizacionom nivou. Usled oštećenja fizičkog i psihičkog zdravlja lekara i medicinskih sestara/tehničara indirektno dolazi i do smanjenja nivoa zdravstvene usluge sa svim svojim posledicama po zdravstveni sistem i zdravlje pacijenata. Ovo istraživanje imalo je za cilj da ispita zastupljenost BOS-a kod zdravstvenih radnika koji se bave lečenjem obolelih od respiratornih bolesti, utvrdi da li postoji razlika u zastupljenosti BOS-a u odnosu na nivo edukacije (lekari i medicinske sestre/tehničari) i u odnosu na radno mesto (zbrinjavanje bolesnika koji boluju od neizlečivih (terminalnih) u odnosu na zbrinjavanje bolesnika koji boluju od izlečivih (kurabilnih). plućnih bolesti. Istraživanje je sprovedeno među zaposlenim zdravstvenim radnicima u Institutu za plućne bolesti Vojvodine u Sremskoj Kamenici u periodu april-jun 2019. godine kao studija poprečnog preseka. Podaci istraživanja su prikupljeni pomoću sledećih upitnika: Upitnik o socio-demografskim karakteristikama ispitanika, Maslač inventar izgaranja (MBI), Skala izgaranja izvedene iz Kopenhagen inventara izgaranja – srpska verzija (SI), Upitnik opšteg zdravlja (UOZ-12) i Upitnik o stresorima na radnom mestu, zadovoljstvu na poslu i motivaciji i opuštanju nakon posla. Istraživanjem je obuhvaćeno 165 zdravstvena radnika: 64 (38.8%) lekara i 101 (61.2%) medicinskih sestara/tehničara. BOS je utvrđen kod 47% ispitanika. Visoki stepen EE potvrđen je kod 43.0%, visok stepen DP kod 21.8%, a nizak stepen PA kod 32.1% ispitanih. Statistički značajna razlika u zastupljenosti nije dokazana u odnosu na stepen stručne spreme (40.6% vs. 51.5%) niti u odnosu na radno mesto (45.3% vs. 48.2%). Nema statistički značajne razlike u zastupljenosti BOS-a u odnosu na socio-demografske karakteristike ispitanika. Psihički distres prisutan je kod 30.8% zdravstvenih radnika sa potvrđenim BOS-om. Pokazana je statistički značajna razlika u povezanosti BOS-a i psihičkog distresa i u odnosu na stepen stručne spreme (p=0.000) i u odnosu na radno mesto (p=0.000), a ova povezanost je izraženija kod medicinskih sestara/tehničara (p=0.000). Značajna korelacija nije nađena samo između dva pretpostavljena stresora i BOS-a: prekovremenog rada i nedostatka odgovarajuće kontinuirane edukacije. Statistički značajna je i korelacija između svih domena BOS-a i ukupnog zadovoljstva radnim okruženjem. (EE p=0.000, DP p=0.000 i PA p=0.000). Trećina ispitanika sa potvrđenim BOS-om razmišlja o promeni zanimanja, a njih 41% o promeni radnog mesta. Sindrom sagorevanja kod zdravstvenih zdravstvenih radnika koji se bave lečenjem obolelih od respiratornih bolesti zastupljen je u visokom procentu. BOS značajno korelira sa psihičkim distresom, a ova povezanost je izraženija u populaciji medicinskih sestara. Nema statistički značajne razlike u zastupljenosti BOS-a u odnosu na nivo edukacije, niti u odnosu na radno mesto. Izražena je kompleksnost, varijabilnost i različitost u zastupljenosti pretpostavljenih stresora na poslu. Neophodnost otkrivanja stresogenih faktora i donošenje mera sa ciljem njihovog sprečavanja i/ili ublažavanja je nesumnjiva. Unapređenje edukacije radi prepoznavanja BOS-a i prevazilaženju stresogenih faktora kao i iznalaženje novih organizacionih šema u cilju eliminacije stresora na poslu trebalo bi da budu jedni od prioriteta svake zdravstvene institucije.
Burnout syndrome (BOS) is a form of occupational stress as a response to chronic stress. It occures most commonly in occupations that involve direct contact with people and manifests as: emotional exhaustion (EE), depersonalization (DP) and feelings of diminished personal achievement (PA). Large numbers of research indicates a high prevalence of BOS in healthcare professionals and its dependence on work related stressors. BOS has been proven to lead to consequences on individual and organizational levels. The level of health care can be reduced due to the decreased physical and mental health of helathcare providers caused by BOS. It is possible consequences on the patient health and healthcare system raises the need for further investigation. The aim of this research was to examine the prevalence of BOS among healthcare providers treating patients with respiratory diseases, to determine difference in the prevalnce of BOS regarding to education level (physicians vs. nurses), and regarding workplace (terminal vs. curable respiratory diseases). This exploratory study was conducted among healthcare providers at the Institute for Pulmonary Diseases of Vojvodina in Sremska Kamenica in the period April-June 2019 as a cross-sectional study Quantitative and qualitative data were collectedtrough survey using the following questionnaires: Questionnaire on sociodemographic characteristics, Maslach burnout inventory (MBI), Work burnout scale from the Copenhagen burnout inventory – serbian version (SI), General health questionnaire (GHQ-12) and Questionnaire on workplace stressors, job satisfaction, motivation and after work relaxation. Out of total 165 healthcare professionals 64 (38.8%) were physicians and 101 (61.2%) nurses. Prevalence of BOS was 47%. High level of EE was confirmed in 43.0%, of DP in 21.8%, and low level of PA in 32.1%. No statistically significant difference was observed in relation to the education (40.6% vs. 51.5%) nor the workplace (45.3% vs. 48.2%). There were no statistically significant difference in socio-demographic characteristics. Psychological distress was present in 30.8% of healthcare professionals with BOS. Statistically significant difference was observed between BOS and psychological distress in terms of educational level (p = 0.000) and workplace (p = 0.000) This correlation was more accentuated in nurses (p = 0.000). Significant correlation was not confirmed only between two perceived stressors and BOS: job overtime and lack of appropriate education. A statistically significant correlation was observed between all domains of BOS and overall job satisfaction. (EE p = 0.000, DP p = 0.000 and PA p = 0.000). One third of respondents with observed BOS are thinking about changing occupation, and 41% of them changing workplace. Prevalence of burnout syndrome among physicians and nurses caring for patients with respiratory diseases is high regardless of education level or workplace. It significantly correlates with level of psychological distress which is is more accentuated among nurses. There is no diference in BOS prevalence regarding neither educational level nor workplace. The complexity, variability and diversity of assumed work stressors is undoubtley related to BOS. The need for determination of job stressor and actions in order to prevent and/or mitigate them is beyond doubt. Improvement of recognition and overcoming stress factors and finding new organizational charts to eliminate potential stressors at work should be one of the priorities of any healthcare institution.

Styles APA, Harvard, Vancouver, ISO, etc.

Chiocchetti, Simone. « High order numerical methods for a unified theory of fluid and solid mechanics ». Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/346999.

Texte intégral

Résumé :

This dissertation is a contribution to the development of a unified model of continuum mechanics, describing both fluids and elastic solids as a general continua, with a simple material parameter choice being the distinction between inviscid or viscous fluid, or elastic solids or visco-elasto-plastic media. Additional physical effects such as surface tension, rate-dependent material failure and fatigue can be, and have been, included in the same formalism. The model extends a hyperelastic formulation of solid mechanics in Eulerian coordinates to fluid flows by means of stiff algebraic relaxation source terms. The governing equations are then solved by means of high order ADER Discontinuous Galerkin and Finite Volume schemes on fixed Cartesian meshes and on moving unstructured polygonal meshes with adaptive connectivity, the latter constructed and moved by means of a in- house Fortran library for the generation of high quality Delaunay and Voronoi meshes. Further, the thesis introduces a new family of exponential-type and semi- analytical time-integration methods for the stiff source terms governing friction and pressure relaxation in Baer-Nunziato compressible multiphase flows, as well as for relaxation in the unified model of continuum mechanics, associated with viscosity and plasticity, and heat conduction effects. Theoretical consideration about the model are also given, from the solution of weak hyperbolicity issues affecting some special cases of the governing equations, to the computation of accurate eigenvalue estimates, to the discussion of the geometrical structure of the equations and involution constraints of curl type, then enforced both via a GLM curl cleaning method, and by means of special involution-preserving discrete differential operators, implemented in a semi-implicit framework. Concerning applications to real-world problems, this thesis includes simulation ranging from low-Mach viscous two-phase flow, to shockwaves in compressible viscous flow on unstructured moving grids, to diffuse interface crack formation in solids.

Styles APA, Harvard, Vancouver, ISO, etc.

Andrea, Božić. « Faktori rizika za pojavu lumbalnog bola kod medicinskih sestara - tehničara ». Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104732&source=NDLTD&language=en.

Texte intégral

Résumé :

Lumbalni bol predstavlja jedan od najučestalijih zdravstvenih problema današnjice. Pružanje zdravstvene nege je stresan i težak fizički posao, te spada u grupu visoko-rizičnih poslova za nastanak lumbalnog bola, pa samim tim medicinske sestre – tehničari predstavljaju vulnerabilnu populaciju. Osnovni ciljevi ovog istraživanja bili su da se utvrdi prevalencija i faktori rizika za nastanak lumbalnog bola kod medicinskih sestara- tehničara, kao i mere prevencije. Istraživanje je sprovedeno u pet zdravstvenih ustanova sa područja Vojvodine u obliku studije preseka, anketiranjem medicinskih sestara – tehničara. Za ispitivanje je korišćen modifikovani Nordijski upitnik. Rezultati pokazuju veoma visoku prevalenciju lumbalnog bola među medicinskim sestrama- tehničarima, oko 94%. Ispitanici su bili uglavnom ženskog pola, prosečne starosti oko 38 godina. Najveći broj ispitanika ima srednju stručnu spremu. Istraživanjem je utvrđeno da postoji statistički značajna povezanost lumbalnog bola sa porastom godina života i dužine ekspozicionog radnog staža. Takođe, statistički visoko značajna korelacija nalazi se između porasta BMI i lumbalnog bola. Najzastupljeniji poslovi zdravstvene nege koje ispitanici sa lumbalnim bolom obavljaju su: pozicioniranje pacijenata, podizanje i presvlačenje pacijenata u postelji i podela terapije. Statistički značajno veća zastupljenost lumbalnog bola javlja se kod ispitanika koji sami obavljaju negu u odnosu na one koji imaju pomoć. Medicinske sestre – tehničari koji pripadaju grupi sa višim nivoom stresa na radnom mestu imaju znatno veći rizik za pojavu lumbalnog bola. Smenski rad (naizmenične dnevne i noćne smene od 12 sati) i prekovremeni rad duži od 8 sati dnevno, podizanje tereta većeg od 25 kg i broj pacijenata koje medicinska sestra – tehničar zbrinjava tokom radnog vremena nemaju značajnu povezanost sa pojavom lumbalnog bola. Oko tri četvrtine ispitanika nije izostajalo sa posla zbog bola. Samo oko 8% ispitanika je promenilo radno mesto zbog lumbalnog bola i ide redovno na periodične lekarske preglede. Kod mera prevencije neophodno je staviti akcenat na smanjenje fizičkog opterećenja donjeg dela leđa i smanjenje ručnog prenošenja tereta. Primenom adekvatnog ergonomskog pristupa, boljom organizacijom rada, podsticajnom atmosferom na poslu i spremnošću nadležnih struktura da iskažu veću brigu prema zaposlenima, smanjila bi se učestalost pojave lumbalnog bola.
One of the today’s most frequent health problems is the low back pain. Nursing is stressful and hard physical job which belongs to the group of high-risk jobs that could cause low back pain and therefore medical nurses/technicians represent the vulnerable population. Determination of prevalence, risk factors and prevention of the low back pain were the main goals of this research. The research in the form of cross-sectional study was conducted with nurses filling in the surveys within five medical institutions in Vojvodina. The modified Nordic questionnaire was used for the surveys. The results show very high prevalence of the low back pain, cca 94%, among medical nurses. Most of the respondents were females, who finished high school education, at average age of 38 years. The study showed that there is a statistically significant coherence between low back pain, ageing and working experience as a nurse. There is also a statistically significant coherence between the low back pain and the increase of the BMI. The most common nursing jobs that respondents with the low back pain do are: positioning of patients, lifting patients, dressing patients in bed and giving therapy. The low back pain with the respondents who do the nursing just by themselves is statistically significantly more present then with the respondents who do the nursing with help. Nurses who suffer more stress at their workplaces have a significantly higher risk to develop low back pain. Working 12 hour shifts (alternately day and night shifts), overtime work, more then 25 kg weight lifting and number of patients for nursing per nurse during working hours have no significant correlation with the low back pain occurrence. About three quarters of the respondents had no absence from work caused by the low back pain. Only 8% of the respondents changed their workplace because of the low back pain and have regular health checks. To prevent the low back pain it is necessary to emphasize the physical reduction of the load on the lower back and manual handling of loads. The frequent low back pain with the nurses could be reduced with the appropriate ergonomic access, better work organization, a supportive atmosphere at work and the willingness of responsible authorities to express greater concern about the employees.

Styles APA, Harvard, Vancouver, ISO, etc.

Milena, Cvjetković. « Analiza ključnih faktora unapređenja poslovanja i konkurentnosti preduzeća ». Phd thesis, Univerzitet u Novom Sadu, Tehnički fakultet Mihajlo Pupin u Zrenjaninu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104089&source=NDLTD&language=en.

Texte intégral

Résumé :

U ovom radu izvršena je analiza kljuĉnih faktora unapređenja poslovanja i konkurentnosti domaćih preduzeća i na osnovu dobijenih rezultata kreiran model ĉijom bi primenom domaća preduzeća unapredila svoj konkurentski položaj na međunarodnom tržištu. U radu je potvrđen znaĉaj znanja u razvoju aspekata kvaliteta, kao i uticaj znanja i kvaliteta na unapređenje poslovnih performansi preduzeća.
In this paper conducted an analysis of the key factors of business improvement and competitiveness of domestic enterprises and on the basis of the results created a model whose application for domestic enterprises to improve their competitive position in the international market. The paper confirmed the importance of knowledge in the development of quality aspects and the impact of quality and knowledge on improving the business performance of companies.

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Livres sur le sujet "Stiff source"

Chang, Shih-Hung. On the application of subcell resolution to conservation laws with stiff source terms. [Washington, DC] : National Aeronautics and Space Administration, 1990.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

LeVeque, Randall J. A study of numerical methods for hyperbolic conservation laws with stiff source terms. Moffett Field, Calif : National Aeronautics and Space Administration, Ames Research Center, 1988.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Konrad, Krimm, et Schadek Hans, dir. Mosbacher Urkundenbuch : Stadt und Stift im Mittelalter. Elztal-Dallau : Laub, 1986.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

National Institute for Social Work. Developing residential practice : A source book of references and resources for staff development. London : National Institute for Social Work, 1985.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Barnett, Anthony. Desert sands : The recordings & performances of Stuff Smith : an annotated discography & biographical source book. Lewes, East Sussex, England : Allardyce, Barnett, 1995.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Confessions of an eco sinner : Tracking down the sources of my stuff. Boston, Mass : Beacon Press, 2008.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Pearce, Fred. Confessions of an eco-sinner : Tracking down the sources of my stuff. Markham, Ont : Fitzhenry & Whiteside, 2008.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Robert, Lester, Beckwith Adam L. 1977-, Farmer Faith et LexisNexis (Firm), dir. Papers of Union staff officers, 1861-1865. Bethesda, MD : UPA Collection from LexisNexis, 2004.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Training design and delivery : A single-source guide for every trainer, training manager, and occasional trainer. Alexandria, VA : ASTD, 1999.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Kamins, Sara. Tracking system operational determination : Draft joint agency staff report. Sacramento, Calif.] : California Energy Commission, 2008.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Chapitres de livres sur le sujet "Stiff source"

LeVeque, Randall J., et Wang Jinghua. « A Linear Hyperbolic System with Stiff Source Terms ». Dans Nonlinear Hyperbolic Problems : Theoretical, Applied, and Computational Aspects, 401–8. Wiesbaden : Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-322-87871-7_48.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Städtke, H., G. Franchello et B. Worth. « Numerical Simulation of Two-Phase Flows with Stiff Source Terms ». Dans Computational Fluid Dynamics 2000, 633–38. Berlin, Heidelberg : Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56535-9_96.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Arora, M., et P. L. Roe. « Issues and Strategies for Hyperbolic Problems with Stiff Source Terms ». Dans ICASE/LaRC Interdisciplinary Series in Science and Engineering, 139–54. Dordrecht : Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5169-6_8.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Pappula, Sampath Kumar, et Sushama Malaji. « A PI with Fuzzy-Based Multifunctional DSTATCOM Operating Under Stiff Source ». Dans Advances in Energy Research, Vol. 2, 825–38. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2662-6_74.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Kurganov, Alexander. « An Accurate Deterministic Projection Method for Hyperboles Systems with Stiff Source Term ». Dans Hyperbolic Problems : Theory, Numerics, Applications, 665–74. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55711-8_62.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Berthon, C., et R. Turpault. « Finite Volumes Asymptotic Preserving Schemes for Systems of Conservation Laws with Stiff Source Terms ». Dans Finite Volumes for Complex Applications VI Problems & ; Perspectives, 107–15. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20671-9_12.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Suzuki, Yoshifumi, et Bram van Leer. « A discontinuous Galerkin method with Hancock-type time integration for hyperbolic systems with stiff relaxation source terms ». Dans Computational Fluid Dynamics 2006, 59–64. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92779-2_6.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Clay, Rudolph. « A Model Workshop to Increase Knowledge of African-American Reference Sources for Public Services Library Staff ». Dans Library Training for Staff and Customers, 47–57. New York : Routledge, 2022. http://dx.doi.org/10.4324/9781315865270-4.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Paradza, Gaynor Gamuchirai. « Women and land inheritance under legal pluralism in Lesotho. » Dans Land governance and gender : the tenure-gender nexus in land management and land policy, 182–92. Wallingford : CABI, 2021. http://dx.doi.org/10.1079/9781789247664.0015.

Texte intégral

Résumé :

Abstract Land inheritance is an important process through which women negotiate access to the resource. Legal pluralism renders land inheritance a complex process for those who rely on inheritance as a source of land. This chapter uses the case study of Lesotho to highlight how legal pluralism influences women's land inheritance in Lesotho. The research applied qualitative research approaches using both primary and secondary data to analyse the status of women's access to land in Lesotho. Primary data collection was undertaken in Maseru and Mafeteng using key informant interviews, focus group discussions and field visits. Key informants included women's organizations, government representatives, Habitat for Humanity staff and beneficiaries, private sector, paralegals, traditional leaders, community councils, widows and land right organizations. Focus group discussions focused on the community council and paralegals, and the Land Advocacy reference group. Secondary data was obtained from published and unpublished sources. The findings were validated through a national workshop with key stakeholders in Lesotho. This means that the study findings can be used as a basis for drawing insights on women's land inheritance experiences of statute, custom and practice in Lesotho.

Styles APA, Harvard, Vancouver, ISO, etc.

LaFantasie, J. J. « The Story of Source Reliability : Practicing Research and Evaluation Skills Using “The Story of Stuff” Video ». Dans Learner-Centered Teaching Activities for Environmental and Sustainability Studies, 261–66. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28543-6_35.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "Stiff source"

Tiselj, Iztok, et Andrej Horvat. « Accuracy of the Operator Splitting Technique for Two-Phase Flow With Stiff Source Terms ». Dans ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31349.

Texte intégral

Résumé :

Code for analysis of the water hammer in thermal-hydraulic systems is being developed within the WAHALoads project founded by the European Commission [1]. Code will be specialized for the simulations of the two-phase water hammer phenomena with the two-fluid model of two-phase flow. The proposed numerical scheme is a two-step second-order accurate scheme with operator splitting; i.e. convection and sources are treated separately. Operator splitting technique is a very simple and “easy-to-use” tool, however, when the source terms are stiff, operator splitting method becomes a source of a specific non-accuracy, which behaves as a numerical diffusion. This type of error is analyzed in the present paper.

Styles APA, Harvard, Vancouver, ISO, etc.

Yu, John. « Treating Stiff Source Terms in Conservation Laws by the CESE Method ». Dans 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-5819.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Mane, Amita A., et Amol A. Kalage. « Load compensation by using a DSTATCOM for a non-stiff source ». Dans 2015 International Conference on Computer, Communication and Control (IC4). IEEE, 2015. http://dx.doi.org/10.1109/ic4.2015.7375572.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Gautam, Shweta, et Rajesh Gupta. « Accurate derivation of switching dynamics for load compensation in non-stiff source distribution system ». Dans 2012 IEEE 21st International Symposium on Industrial Electronics (ISIE). IEEE, 2012. http://dx.doi.org/10.1109/isie.2012.6237074.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Shahane, R. T., P. D. Dhoble, P. P. Nachankar, P. S. Dharme, P. Y. Lilhare, K. S. Pimpley et S. P. Gawande. « Positive sequence ISCT based distribution static compensator for non-stiff source using state feedback control ». Dans 2016 International Conference on Energy Efficient Technologies for Sustainability (ICEETS). IEEE, 2016. http://dx.doi.org/10.1109/iceets.2016.7583790.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

YEE, H., et JUDY SHINN. « Semi-implicit and fully implicit shock-capturing methods for hyperbolic conservation laws with stiff source terms ». Dans 8th Computational Fluid Dynamics Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1987. http://dx.doi.org/10.2514/6.1987-1116.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Shahane, Rajat T., Vijay B. Borghate, R. Reshma Krishnan et Pratik P. Nachankar. « Load compensation for non-stiff source system using MIRP theory for unbalance and non-linear load using DSTATCOM ». Dans 2018 International Conference on Power, Instrumentation, Control and Computing (PICC). IEEE, 2018. http://dx.doi.org/10.1109/picc.2018.8384765.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Gawande, S. P., et M. R. Ramteke. « Integrated three-level NPC based DSTATCOM topology using MISCT control algorithm for load compensation with non-stiff source ». Dans 2015 IEEE 11th International Conference on Power Electronics and Drive Systems. IEEE, 2015. http://dx.doi.org/10.1109/peds.2015.7203538.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Srinivas, K., et S. S. Tulasi Ram. « A fast dynamic response of three phase four wire shunt active power filter under unbalanced non stiff source ». Dans 2014 International Conference on Smart Electric Grid (ISEG). IEEE, 2014. http://dx.doi.org/10.1109/iseg.2014.7005387.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Yu, Sheng-Tao, Sin-Chung Chang, Sheng-Tao Yu et Sin-Chung Chang. « Treatments of stiff source terms in conservation laws by the method of space-time conservation element/solution element ». Dans 35th Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-435.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Rapports d'organisations sur le sujet "Stiff source"

Wang, Wei, Chi-Wang Shu, H. C. Yee et Bjoern Sjoegreen. High Order Finite Difference Methods with Subcell Resolution for Advection Equations with Stiff Source Terms. Fort Belvoir, VA : Defense Technical Information Center, juin 2011. http://dx.doi.org/10.21236/ada557706.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Panko, Mary. Undergraduate Research : A Source for Faculty Publications ? Unitec ePress, avril 2014. http://dx.doi.org/10.34074/ocds.002.

Texte intégral

Résumé :

Over the last two decades undergraduate students have been encouraged to problem solve in ‘the real world’ in order to construct their own subject knowledge. This generally means that students are required to carry out research in their disciplines, a process which inevitably leads to the production of quantities of data. Once their findings are reported back to faculty and have been graded, they are largely ignored, as they are ‘only’ the product of undergraduate research. However, since 2000 there has been a move to bring this type of work into the open through undergraduate research conferences in order to benefit both the students and their institutions. Nevertheless, except for a few publications within medical teaching, faculty themselves have not widely used this data for their own research, perhaps fearing its potential lack of authenticity or credibility. This paper explores a case study to examine the validity and reliability of students’ findings and considers whether the observations obtained by students can or should be made into academic publications by staff. This study comprised four cohorts, totaling 109 second-year undergraduate automotive students, who had made repeat visits to a number of automotive workshops and reviewed the workshops’ activities with a particular focus on customer service, health and safety, and waste management. Analysis of the top 25% of students’ reports revealed that a number of compliance failures were appearing on such a regular basis that these findings should be brought to the attention of the automotive industry. The paper concludes with a recommendation that under carefully controlled conditions, academics should draw on this hitherto ignored seam of research data.

Styles APA, Harvard, Vancouver, ISO, etc.

Panko, Mary. Undergraduate Research : A Source for Faculty Publications ? Unitec ePress, avril 2014. http://dx.doi.org/10.34074/ocds.002.

Texte intégral

Résumé :

Styles APA, Harvard, Vancouver, ISO, etc.

Panko, Mary. Undergraduate Research : A Source for Faculty Publications ? Unitec ePress, avril 2014. http://dx.doi.org/10.34074/ocds.002.

Texte intégral

Résumé :

Styles APA, Harvard, Vancouver, ISO, etc.

Marold, Juliane, Ruth Wagner, Markus Schöbel et Dietrich Manzey. Decision-making in groups under uncertainty. Fondation pour une culture de sécurité industrielle, février 2012. http://dx.doi.org/10.57071/361udm.

Texte intégral

Résumé :

The authors have studied daily decision-making processes in groups under uncertainty, with an exploratory field study in the medical domain. The work follows the tradition of naturalistic decision-making (NDM) research. It aims to understand how groups in this high reliability context conceptualize and internalize uncertainties, and how they handle them in order to achieve effective decision-making in their everyday activities. Analysis of the survey data shows that uncertainty is thought of in terms of issues and sources (as identified by previous research), but also (possibly a domain-specific observation) as a lack of personal knowledge or skill. Uncertainty is accompanied by emotions of fear and shame. It arises during the diagnostic process, the treatment process and the outcome of medical decision making. The most frequently cited sources of uncertainty are partly lacking information and inadequate understanding owing to instability of information. Descriptions of typical group decisions reveal that the individual himself is a source of uncertainty when a lack of knowledge, skills and expertise is perceived. The group can serve as a source of uncertainty if divergent opinions in the decision making group exist. Three different situations of group decisions are identified: Interdisciplinary regular meetings (e.g. tumor conferences), formal ward meetings and ad hoc consultations. In all healthcare units concerned by the study, only little use of structured decision making procedures and processes is reported. Strategies used to handle uncertainty include attempts to reduce uncertainty by collecting additional information, delaying action until more information is available or by soliciting advice from other physicians. The factors which ultimately determine group decisions are hierarchy (the opinion of more senior medical staff carries more weight than that of junior staff), patients’ interest and professional competence. Important attributes of poor group decisions are the absence of consensus and the use of hierarchy as the predominant decision criterion. On the other hand, decisions judged to be effective are marked by a sufficient information base, a positive discussion culture and consensus. The authors identify four possible obstacles to effective decision making: a steep hierarchy gradient, a poor discussion culture, a strong need for consensus, and insufficient structure and guidance of group decision making processes. A number of intervention techniques which have been shown in other industries to be effective in improving some of these obstacles are presented.

Styles APA, Harvard, Vancouver, ISO, etc.

Mazzoni, Silvia, Nicholas Gregor, Linda Al Atik, Yousef Bozorgnia, David Welch et Gregory Deierlein. Probabilistic Seismic Hazard Analysis and Selecting and Scaling of Ground-Motion Records (PEER-CEA Project). Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, novembre 2020. http://dx.doi.org/10.55461/zjdn7385.

Texte intégral

Résumé :

This report is one of a series of reports documenting the methods and findings of a multi-year, multi-disciplinary project coordinated by the Pacific Earthquake Engineering Research Center (PEER) and funded by the California Earthquake Authority (CEA). The overall project is titled “Quantifying the Performance of Retrofit of Cripple Walls and Sill Anchorage in Single-Family Wood-Frame Buildings,” henceforth referred to as the “PEER–CEA Project.” The overall objective of the PEER–CEA Project is to provide scientifically based information (e.g., testing, analysis, and resulting loss models) that measure and assess the effectiveness of seismic retrofit to reduce the risk of damage and associated losses (repair costs) of wood-frame houses with cripple wall and sill anchorage deficiencies as well as retrofitted conditions that address those deficiencies. Tasks that support and inform the loss-modeling effort are: (1) collecting and summarizing existing information and results of previous research on the performance of wood-frame houses; (2) identifying construction features to characterize alternative variants of wood-frame houses; (3) characterizing earthquake hazard and ground motions at representative sites in California; (4) developing cyclic loading protocols and conducting laboratory tests of cripple wall panels, wood-frame wall subassemblies, and sill anchorages to measure and document their response (strength and stiffness) under cyclic loading; and (5) the computer modeling, simulations, and the development of loss models as informed by a workshop with claims adjustors. This report is a product of Working Group 3 (WG3), Task 3.1: Selecting and Scaling Ground-motion records. The objective of Task 3.1 is to provide suites of ground motions to be used by other working groups (WGs), especially Working Group 5: Analytical Modeling (WG5) for Simulation Studies. The ground motions used in the numerical simulations are intended to represent seismic hazard at the building site. The seismic hazard is dependent on the location of the site relative to seismic sources, the characteristics of the seismic sources in the region and the local soil conditions at the site. To achieve a proper representation of hazard across the State of California, ten sites were selected, and a site-specific probabilistic seismic hazard analysis (PSHA) was performed at each of these sites for both a soft soil (Vs30 = 270 m/sec) and a stiff soil (Vs30=760 m/sec). The PSHA used the UCERF3 seismic source model, which represents the latest seismic source model adopted by the USGS [2013] and NGA-West2 ground-motion models. The PSHA was carried out for structural periods ranging from 0.01 to 10 sec. At each site and soil class, the results from the PSHA—hazard curves, hazard deaggregation, and uniform-hazard spectra (UHS)—were extracted for a series of ten return periods, prescribed by WG5 and WG6, ranging from 15.5–2500 years. For each case (site, soil class, and return period), the UHS was used as the target spectrum for selection and modification of a suite of ground motions. Additionally, another set of target spectra based on “Conditional Spectra” (CS), which are more realistic than UHS, was developed [Baker and Lee 2018]. The Conditional Spectra are defined by the median (Conditional Mean Spectrum) and a period-dependent variance. A suite of at least 40 record pairs (horizontal) were selected and modified for each return period and target-spectrum type. Thus, for each ground-motion suite, 40 or more record pairs were selected using the deaggregation of the hazard, resulting in more than 200 record pairs per target-spectrum type at each site. The suites contained more than 40 records in case some were rejected by the modelers due to secondary characteristics; however, none were rejected, and the complete set was used. For the case of UHS as the target spectrum, the selected motions were modified (scaled) such that the average of the median spectrum (RotD50) [Boore 2010] of the ground-motion pairs follow the target spectrum closely within the period range of interest to the analysts. In communications with WG5 researchers, for ground-motion (time histories, or time series) selection and modification, a period range between 0.01–2.0 sec was selected for this specific application for the project. The duration metrics and pulse characteristics of the records were also used in the final selection of ground motions. The damping ratio for the PSHA and ground-motion target spectra was set to 5%, which is standard practice in engineering applications. For the cases where the CS was used as the target spectrum, the ground-motion suites were selected and scaled using a modified version of the conditional spectrum ground-motion selection tool (CS-GMS tool) developed by Baker and Lee [2018]. This tool selects and scales a suite of ground motions to meet both the median and the user-defined variability. This variability is defined by the relationship developed by Baker and Jayaram [2008]. The computation of CS requires a structural period for the conditional model. In collaboration with WG5 researchers, a conditioning period of 0.25 sec was selected as a representative of the fundamental mode of vibration of the buildings of interest in this study. Working Group 5 carried out a sensitivity analysis of using other conditioning periods, and the results and discussion of selection of conditioning period are reported in Section 4 of the WG5 PEER report entitled Technical Background Report for Structural Analysis and Performance Assessment. The WG3.1 report presents a summary of the selected sites, the seismic-source characterization model, and the ground-motion characterization model used in the PSHA, followed by selection and modification of suites of ground motions. The Record Sequence Number (RSN) and the associated scale factors are tabulated in the Appendices of this report, and the actual time-series files can be downloaded from the PEER Ground-motion database Portal (https://ngawest2.berkeley.edu/)(link is external).

Styles APA, Harvard, Vancouver, ISO, etc.

Heston, Roxanne. Mapping U.S. Multinationals’ Global AI R&D Activity. Center for Security and Emerging Technology, décembre 2020. http://dx.doi.org/10.51593/20190008.

Texte intégral

Résumé :

Many factors influence where U.S. tech multinational corporations decide to conduct their global artificial intelligence research and development (R&D). Company AI labs are spread all over the world, especially in North America, Europe and Asia. But in contrast to AI labs, most company AI staff remain concentrated in the United States. Roxanne Heston and Remco Zwetsloot explain where these companies conduct AI R&D, why they select particular locations, and how they establish their presence there. The report is accompanied by a new open-source dataset of more than 60 AI R&D labs run by these companies worldwide.

Styles APA, Harvard, Vancouver, ISO, etc.

Gordon, Shannon, et Alison Hitchens. Library Impact Practice Brief : Supporting Bibliometric Data Needs at Academic Institutions. Association of Research Libraries, octobre 2020. http://dx.doi.org/10.29242/brief.waterloo2020.

Texte intégral

Résumé :

This practice brief presents research conducted by staff at the University of Waterloo Library as part of the library’s participation in ARL’s Research Library Impact Framework initiative. The research addressed the question, “How can research libraries support their campus community in accessing needed bibliometric data for institutional-level purposes?” The brief explores: service background, partners, service providers and users, how bibliometric data are used, data sources, key lessons learned, and recommended resources.

Styles APA, Harvard, Vancouver, ISO, etc.

Vlaicu, Razvan, et Philip Keefer. Employee Trust and Performance Constraints in Public Sector Organizations. Inter-American Development Bank, septembre 2022. http://dx.doi.org/10.18235/0004456.

Texte intégral

Résumé :

Theory suggests that employee trust is key to productivity in organizations, but empirical evidence documenting links between trust and constraints on performance is scarce. This paper analyzes self-collected data on public sector employees from eighteen Latin American countries and finds that individual-level trust is relevant to three types of performance factors. First, high-trust employees are more willing to collaborate and share information with coworkers and are more supportive of technological innovation. Second, high-trust respondents have different perceptions of organizational constraints: they are less concerned with low staff quality or lack of discretion to innovate, and more concerned with staff shortages. Third, trust in coworkers is associated with stronger mission motivation. Instrumental variable strategies based on the transmission of trust through social and professional channels account for potential sources of endogeneity. A survey experiment on preferences for social distancing policies provides further evidence that trust enhances mission motivation: employee policy preferences align better with the implied government policy when their trust in the public sector is higher.

Styles APA, Harvard, Vancouver, ISO, etc.

Keefer, Philip, et Razvan Vlaicu. Employee Trust and Performance Constraints in Public Sector Organizations. Inter-American Development Bank, décembre 2022. http://dx.doi.org/10.18235/0004596.

Texte intégral

Résumé :

Styles APA, Harvard, Vancouver, ISO, etc.

Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!