49 research outputs found
Bioacumulación del Mercurio en el pescado del Pacifico
No full textApuzzo, Yuna; director de proyecto: Zamora Benito, Alberto Manuel2023-2024Grado en VeterinariaFacultad de Veterinari
Remedial landscape for Hanford's nuclear future
No full textThesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 2013.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (p. 101-103).The groundbreaking discovery of nuclear fission opened up new possibilities for generating power and resources for people. Nuclear energy was much preferred over fossil fuel because of its efficiency in production, availability of resources, and cost. However, the reoccurring nuclear disasters around the world provoke us to reconsider the future of nuclear energy. This thesis acknowledges the contemporary issues particularly surrounding nuclear waste contamination and the risks that associated toxins present to human health and the existing ecosystem. The risk of exposure to radioactive materials and groundwater contamination can be reduced with proven technological methods but the public perception of nuclear waste treatment remains a daunting deterrent, preventing people from confronting the waste management issues effectively. The thesis investigates ways to create new typology of remedial infrastructure where nuclear waste management technologies can co-exist with cultural programs; the new typology becomes an instrument that helps people to rethink the future of nuclear energy. The Experiential Bridge enables greater adoption of environmentally friendly nuclear waste treatment by exposing the process to the public and creating an educational experience for people. The Experiential Bridge not only treats toxins, but also serves as a pathway for recreational activity, and a source of education for the treatment of contaminated water and soil.by YuNa Kim.M.Arch
Pathways of purpose: longitudinal research on careers and meaningful work
No full textThis symposium explores the pursuit of meaningful work over time, focusing on how individuals and organizations foster, sustain, and adapt this sense of purpose throughout careers. Drawing on longitudinal research, the symposium examines how personal experiences, career transitions, and organizational factors shape perceptions of meaningful work. Presentations span qualitative and quantitative methodologies, offering nuanced insights into the subjective and structural elements that influence career trajectories. These presentations collectively illuminate the interplay between individual agency, external forces, and the pursuit of meaning through work and provide a foundation for understanding how perceptions of meaningful work evolve, the strategies individuals adopt to maintain fulfillment, and how organizations can support sustainable career paths. Privilege, Serendipity and Career Success: The Case of Elite MBA Graduates Author: Hannah Weisman; Harvard Business School Author: Leslie Perlow; Harvard Business School Call Me Maybe: The Calling Alignment Model Author: Shoshana Dobrow; London School of Economics and Political Science Author: Jennifer Tosti-Kharas; Babson College Author: Hannah Weisman; Harvard Business School Downshifting at Work: Journeys of Self-Learning Born from Quests to Work Less Author: Megan Gorges; Harvard Business School Promoted Out of or Away from Passion? How Nurses Navigate Promotions from Patient Care to Management Author: Solomiya Draga; Harvard Business School Author: Jon Michael Jachimowicz; Harvard Business School When Meaningful Work Meets Organizational Change: A Longitudinal Study of Employees’ Perceived Work Meaningfulness During a Merger Author: Shawn Chan; INSEAD Author: Yuna Cho; Sungkyunkwan University Author: Winnie Jiang; INSEAD Author: Lucas Dufour; Toronto Metropolitan University Author: Arnaud BANOUN; ESC Clermont Business Schoo
Numerical Modelling and Dynamic Analysis of Offshore Wind Turbine Blade Installation
No full textInstalling offshore wind turbine blades is very challenging and risky due to large lifting height and high required installation precision. Offshore single blade installation is frequently adopted because of small deck space requirement. Current practice in the industry is to install offshore wind turbine blades by jack-up crane vessels in shallow waters. The typical operational environmental condition is mean wind speed less than 10m/s and significant wave height lower than 1.5_2m. Compared with jack-up crane vessels, floating ones are flexible with respect to operational water depth and efficiency in relocation. The latter might be an alternative for installing offshore wind turbine blades, especially in intermediate and deep waters.
Numerical studies of the critical operational scenarios during the planning phase is important aid for planning and execution of a safe and efficient installation. During offshore single blade installation, the final blade mating operation is generally considered to be the critical phase. To assess the dynamic responses of offshore single blade installation systems during mating operations, coupled simulation methods that account for blade aerodynamics, vessel hydrodynamics and crane flexibilities are needed, but are currently limited.
In this thesis, a fully coupled method, SIMO-RIFLEX-Aero, is established for numerical modeling and analysis of offshore single blade installation by jack-up or floating crane vessels. It can account for blade aerodynamics, vessel hydrodynamics, structural dynamics and wire coupling mechanics. The leg-soil interaction is also considered for jack-up vessels. The blade aerodynamic loads are calculated in the Aero code developed in this study based on the instantaneous blade displacement and velocity according to the cross-ow principle.
The coupled method is used to study offshore single blade installation of the DTU 10 MW wind turbine blade by a typical jack-up crane vessel. The jack-up crane vessel is modeled in details with consideration of wave loads on the legs, wind loads on the hull, structural flexibility of legs and crane, as well as soil-leg interaction. The wave-induced vessel motion and crane flexibility are found to have significant influence on the blade motion. The influence is dependent on site-specific parameters such as soil properties. Detailed modeling of soil behavior using linear springs with dampers is recommended. Simple models using pinned or fixed foundations lead to large overestimation and underestimation of blade motion, respectively, which may affect estimation of operational safety and efficiency.
A preliminary feasibility study on single blade installation by using large floating crane vessels is carried out, by comparing their performance with a typical jack-up crane vessel. Two typical floating crane vessels are considered, i.e., a mono-hull and a semi-submersible. They are assumed to be equipped with DP systems that can well eliminate their slowing varying horizontal motions. The results indicate that single blade installation by floating vessels is feasible. The feasibility depends on vessel type and size, as well as site conditions. The semi-submersible vessel is more feasible than the mono-hull vessel. However, the life cycle cost versus benefit needs further assessment. The efficiency of floating vessel installation is higher in short wave conditions. Utilization of weather orientation for floating vessels can greatly reduce the installed blade motion and thus reduce the operational cost.
Allowable operational limits in terms of environmental conditions are also evaluated for single blade installation by the semi-submersible crane vessel. They, together with weather forecasts, can assist the planning and decision-making during the execution of installation operation. The critical events, limiting parameters and criteria are firstly identified. The critical events are excessive radial motion of the blade root or bent guide pins at blade root. The corresponding limiting parameters are radial motion and radial impact velocity at the blade root, respectively. For instance, the impact criterion to avoid bent guide pins at blade root which is related to the radial impact velocity, is determined based on nonlinear finite element analysis. Slacks in tugger lines should be avoided and are considered as restrictive events. Fully coupled time domain simulations are then conducted to estimate the characteristic values of the limiting parameters. The operational limits, in terms of wind and wave conditions, are thus derived by using response-based criteria. The impact criterion is considered to be conservative since the turbine hub is assumed to be rigid.
In summary, the author develops a fully coupled method for numerical modeling and analysis of single blade installation and conducts a systematic study on installation by jack-up and floating crane vessels. The coupled method can also be used to investigate demounting or replacing offshore wind turbine blades and can be extended to study installation of rotor, and fully assembled tower-rotor-nacelle for offshore wind turbines. In practice, it can be utilized to assist the planning and execution phases of installation and to develop simulators for personnel training.digital fulltext not avialabl
Two essays in banking and finance
No full textThis dissertation includes two essays. The first essay investigates whether money illusion misleads investors in the stock market. To the extent that anomalies reflect mispricing, I examine whether money illusion plays a role in the anomaly-based strategies. I find that, following high inflation, anomalies are stronger and the returns on the short-leg portfolios are lower. These findings indicate investors are overly optimistic on the past performance of stocks and overestimate the upside potential of stock returns following high inflation periods. I extend the effect of money illusion by examining sentiment and other commonly used measure for predicting stock returns. I find that money illusion-driven mispricing remains largely unchanged after controlling for many additional variables. These results suggest that money illusion provides a complementary power for cross-sectional stock returns beyond commonly used variables. In summary, this essay contributes to the literatures on money illusion and mispricing by providing evidence that money illusion can lead to mispricing in the stock market. The second essay identifies a new risk factor for bank stock returns. First, I document that standard factor models do not explain bank stock returns well. I investigate the linkage between Loan Loss Provision (LLP) and bank stock returns. I find that low-LLP bank stocks have significantly higher risk-adjusted returns than medium- and high-LLP bank stocks. These findings indicates that low-LLP banks are more likely distressed when economic conditions are bad, as a result, investors require higher returns on low-LLP bank stocks. Most importantly, the new factor model including the LLP return factor adds a new dimension of explanatory power for bank stock returns, reducing the magnitude of alphas mostly to insignificance. Combined with its economic intuition, this essay suggests that loan loss provisions play an important role in evaluating bank stock returns.Ph.D.Includes bibliographical referencesIncludes vitaby Yuna He
<Статья/ Article>Reading Nabokov's “Tragedy of Tragedy”: As an artistic theory related to Aristotle's “Poetics”
No full textIn this paper, we analyze Nabokov's “Tragedy of Tragedy.” We clarify that Nabokov argues that the plays, as literary works, have been trapped in the unique “narrative” structure, which tells the life of a character through the certain transcendental perspective, perspective of “audience author.” Nabokov implies, that is because western plays have been influenced by Aristotle's “Poetics”, in which it is said that elements of chance should be excluded from occurrences in plays. In the first half of this paper, we analyze the reason why Nabokov argues such an unique “narrative” structure of plays. In addition, by comparing with a narrative of novels, we reach the conclusion that the tragedy that Nabokov aimed for was one in which the recipient (reader) could compose the story for oneself, not receiving the story only through the viewpoint of the author or narrator. In the latter part of this paper, we examine the role that Aristotle's “Poetics” played in the history of tragedy. First, we read Aristotle's “Poetics” and clarify his opinion that Nabokov implied, but we prove that at the same time Aristotle approves elements of chance when it takes the form of an oracle. Then, we examine the relation between the mythical side of Greek tragedy and Euripides' manner, “deus ex machina”. We reach some view: Euripides' “deus ex machina” shows his attempt to make his play consistent with traditional Greek tragedy, which has implicit condition that the occurrence in plays are something already done and already decided. We conclude that when Aristotle tries to eliminate elements of chance from plays so as to make the tragedy logical, he essentially insists that authors should create story through the perspective of the “audience”, which is nothing to do with original one of Greek tragedy. Also, it is because he implicitly finds out dramatic conventions (условность), that he approves the oracle outside the plot. Remarking “audience” and this dramatic convention, Aristotle created a certain genre today we call “literature.” We conclude that “Tragedy of Tragedy” can be called a descendant of Aristotle's “Poetics, ” for it is artistic theory that presents Nabokov's drastic attitude towards literature, trying to expose the unspoken conventions hidden in the genre of “drama” and renew this genre
The Relationship of Micronutrient Intake with the Incidence of Anemia in Adolescents
No full textAbstract: Anemia is a condition in which the concentration of hemoglobin in the blood is less than normal. Low iron intake is the biggest factor in the occurrence of iron deficiency anemia. In addition to iron, other nutrients that can cause anemia are: Zinc, Vitamin B6, Vitamin C, Vitamin B12, and Folic Acid. This study aimed to determine the relationship between micronutrient intake and the incidence of anemia in adolescents. The method used is a descriptive-analytic method with a cross-sectional approach. Data on micronutrient intake was obtained through a 2x24 hour recall method and then analyzed with nutrisurvey software and compared with the RDA. Examination of hemoglobin levels using the hematology analysis method. The results showed that the prevalence of anemia was 15 people (25%). The results of the analysis showed that there was a relationship between intake of iron (p = 0.000), vitamin B12 (p = 0.000), folic acid (p = 0.001), and zinc (p = 0.000) with the incidence of anemia. On the other hand, there is no relationship between vitamin C intake and the incidence of anemia (p=1.0). It is recommended that students increase their consumption of foods rich in iron, vitamin B12, folic acid, zinc, and vitamin C
Keywords: Anemia, Micronutrient Intake, Adolescents.
Title: The Relationship of Micronutrient Intake with the Incidence of Anemia in Adolescents
Author: Rahayu Yekti, Pratiwi D.Kusumo, Yuna Prilia RJ. Silitonga
International Journal of Recent Research in Life Sciences (IJRRLS)
ISSN 2349-7823
Vol. 9, Issue 3, July 2022 - September 2022
Page No: 9-13
Paper Publications
Website: www.paperpublications.org
Published Date: 10-August-2022
DOI: https://doi.org/10.5281/zenodo.6979674
Paper Download Link (Source)
https://www.paperpublications.org/upload/book/The%20Relationship%20of%20Micronutrient-10082022-3.pdfInternational Journal of Recent Research in Life Sciences (IJRRLS), ISSN 2349-7823, Paper Publications, Website: www.paperpublications.or
Photoresponsive Chiral Dopants: Light‐Driven Helicity Manipulation in Cholesteric Liquid Crystals for Optical and Mechanical Functions
No full textThis Review focuses on recent advancements regarding the design of photoisomerizable chiral dopants which can switch the helical orientation in cholesteric liquid crystals upon light stimuli. Chiral dopants exhibiting conformational change in response to an external stimulus can provide dynamic control of the cholesteric pitch. Development of such responsive systems has been attempted since the 1970s. However, major advances on efficient chiral dopants exhibiting either high helical twisting power or large photoswitching have been achieved only in recent years. This Review covers photoresponsive low molecular weight cholesteric liquid crystal systems based on chiral dopants capable of photochemically “switching power to twist” surrounding liquid crystalline host molecules, “inverting” their handedness or even “inducing” helical organization from the racemic nematic phase
The importance of trust distance on stock market correlation : Evidence from emerging economics
No full textSeveral studies have shown that the level of trust between agents is a determinant of financial decisions. This paper studies this issue further by analyzing whether the trust distance between two countries can explain bilateral stock market correlations among emerging countries. One finding is that a smaller trust distance among nations is related to a higher stock market correlation. This effect seems to be more pronounced in active-trading countries than thin-trading countries. Finally, we confirm the effect of trust distance upon stock market correlations by excluding extreme observations. © 2019 The Author</p
Electrofluorochromic Device Based on a Redox-Active Europium(III) Complex
No full textElectrofluorochromism owing to redox reactions on the center europium (Eu) ion in ionic liquids is examined for the helicate complexes (abbreviated as EuL) with a hexadentate pyridine derivative. Typical electrofluorochromism requires extra electroactive units complementing intra- or intermolecular energy transfer to quench fluorophores. Herein, an unprecedentedly simplified electrofluorochromic system overcoming such issues is demonstrated by utilizing reversible electrochemistry of EuL between Eu3+ and Eu2+, which accompanies large emission transition. A three-electrode electrochemical switching device is facilely prepared with an ionic liquid [BMIM] [PF6] and EuL mixture. Benefiting from the stable helical coordinated structure of the ligand in [BMW] [PF6], highly enhanced red fluorescence of EuL with small quantity (<= 1 wt %) is utilized. Rapid response and large contrast of luminescence are achieved: the emission is drastically quenched at the reduced state (Eu2+) and it is successfully restored by subsequent oxidation (Eu3+) The reversible fluctuation of excitation and emission spectra of an electrofluorochromic device is achieved in the potential window within +/- 2 V. The device affords excellent optoelectric properties in terms of well-controlled luminescence switching depending on the applied potentials and its durability. This work paves an efficient and smart way toward Eu luminescence control in optoelectronic devices
