scholarly journals Problemas de exámenes y soluciones XXX Olimpiada Costarricense de Matemática, 2018

2020 ◽  
Vol 20 (2) ◽  
Author(s):  
Christian Páez ◽  
Marvin Abarca ◽  
Leonel Chaves ◽  
Alexander Hernández ◽  
Gabriela Calderón ◽  
...  
Keyword(s):  
Costa Rica ◽  
Final Stage ◽  
Sixth Grade ◽  
Costa Rican ◽  
Developmental Problems ◽  
Level Ii ◽  
Classified Students ◽  
Selection Test ◽  
Level I ◽  
Respective Solution

OLCOMA es la Comisión de Olimpiadas Costarricenses de Matemáticas. Esta comisión está conformada por académicos en el área de Matemática de la Universidad Nacional, del Instituto Tecnológico de Costa Rica, de la Universidad de Costa Rica, de la Universidad Estatal a Distancia, y por representantes del Ministerio de Educación Pública y del Ministerio de Ciencia, Tecnología y Telecomunicaciones.   Dentro de la estructura de las Olimpiadas Costarricenses de Matemáticas, se tienen tres niveles de competencia. En Nivel I participan estudiantes de sétimo año, entre 10 y 13 años, aproximadamente (también pueden optar por participar en este nivel los estudiantes de primaria que cursan sexto grado). En Nivel II participan estudiantes de octavo y noveno años, entre 14 y 15 aõs, aproximadamente. En  Nivel III participan estudiantes de décimo, undécimo y duodécimo años, más de 15 años. Durante el año 2017, se trabajó con tres etapas. En la I Eliminatoria los estudiantes resolvieron un examen de selección única con 25 ítems. En la II Eliminatoria, los clasificados realizaron un examen con 12 preguntas de selección única y tres problemas de desarrollo. En la Etapa Final, los estudiantes clasificados realizaron dos pruebas en días consecutivos, cada prueba con tres problemas de desarrollo.   El objetivo de este libro es que los futuros participantes en Olimpiadas Costarricenses de Matemáticas posean material de consulta. Los problemas que en este libro se enuncian representan un reto para quienes gustan resolver ejercicios matemáticos. Cada uno de los problemas tiene la solución respectiva, así que una vez que intenten resolver cada problema, pueden comparar el procedimiento realizado con la solución propuesta. Se han incorporado todos los problemas de I Eliminatoria para cada uno de los tres niveles, los problemas de II Eliminatoria para cada uno de los tres niveles, los problemas propuestos para conformar los exámenes de la Etapa Final y los problemas que conformaron los exámenes de la Etapa Final. Abstract OLCOMA is the Costa Rican Mathematics Olympics Commission. This commission is made up of academics in the area of Mathematics from the Universidad Nacional, the Instituto Tecnológico de Costa Rica, the Universidad de Costa Rica, the Universidad Estatal a Distancia, and the Universidad Autónoma de Costa Rica and by representatives of the Ministry of Public Education and of the Ministry of Science, Technology, Culture and TelecomuncationsWithin the structure of the Costa Rican Mathematical Olympiads, there are three levels of competition. In Level I there are students of seventh year, between 10 and 13 years old, approximately (also the students of primary school that are studying in this level can choose to participate in this level sixth grade). In Level II, students of eighth and ninth years, between 14 and 15 years, approximately, participate. In Level III there are students of tenth, eleventh and twelfth years, plus 15 years old. During the year 2017, we worked with three stages. In the First Elimination, the students resolved toa single selection test with 25 items. In the II Eliminatory, the classified ones carried out aexam with 12 single-choice questions and three developmental problems. In the Final Stage, the classified students took two tests on consecutive days, each test with three tests developmental problems. The objective of this book is that future participants in Costa Rican Mathematics Olympiads possess reference material.    The problems listed in this book represent a challenge for those who like to solve mathematical exercises. Each of the problems has the respective solution, so once who try to solve each problem, can compare the procedure carried out with the proposed solution. All the problems of I Eliminatory for each one of the three levels, the problems of II Eliminatory for each one of the three levels, the problems proposed to conform the examinations of the Final Stage and the problems that conformed the examinations of the Final Stage have been incorporated.

CLINICAL FEATURES, INDICATIONS AND RESULT OF TRACHEOTOMY

2017 ◽  
pp. 50-55
Author(s):  
Duc Luu Ngo ◽  
Tu The Nguyen ◽  
Manh Hung Ho ◽  
Thanh Thai Le
Keyword(s):  
Clinical Features ◽  
University Hospital ◽  
Female Ratio ◽  
Tube Obstruction ◽  
Level Ii ◽  
Study Results ◽  
Male Female Ratio ◽  
Hospital Patients ◽  
Level I

Background: This study aims to survey some clinical features, indications and results of tracheotomy at Hue Central Hospital and Hue University Hospital. Patients and method: Studying on 77 patients who underwent tracheotomy at all of departments and designed as an prospective, descriptive and interventional study. Results: Male-female ratio was 4/1. Mean age was 49 years. Career: farmer 44.2%, worker 27.2%, officials 14.3%, student 7.8%, other jobs 6.5%. Respiratory condition before tracheotomy: underwent intubation 62.3%, didn’t undergo intubation 37.7%. Period of stay of endotracheal tube: 1-5 days 29.2%, 6-14 days 52.1%, >14 days 18.7%. Levels of dyspnea before tracheotomy: level I 41.4%, level II 48.3%, level III 0%, 10.3% of cases didn’t have dyspnea. Twenty cases (26%) were performed as an emergency while fifty seven (74%) as elective produces. Classic indications (37.7%) and modern indications (62.3%). On the bases of the site, we divided tracheostomy into three groups: high (0%), mid (25.3%) and low (74.7%). During follow-up, 44 complications occurred in 29 patients (37.7%). Tracheobronchitis 14.3%, tube obstruction 13%, subcutaneous empysema 10.4%, hemorrhage 5%, diffcult decannulation 5.2%, tube displacement 3.9%, canule watery past 2.6%, wound infection 1.3%. The final result after tracheotomy 3 months: there are 33 patients (42.9%) were successfully decannulated. In the 33 patients who were successfully decannulated: the duration of tracheotomy ranged from 1 day to 90 days, beautiful scar (51.5%), medium scar (36.4%), bad scar (12.1%). Conclusions: In tracheotomy male were more than female, adult were more than children. The main indication was morden indication. Tracheobronchitis and tube obstruction were more common than other complications. Key words: Tracheotomy

Parity without Equality

2018 ◽  
Author(s):  
Jennifer M. Piscopo
Keyword(s):  
Costa Rica ◽  
Party System ◽  
Political Representation ◽  
Costa Rican ◽  
Women In Politics ◽  
Negative Consequences ◽  
Economic Problems ◽  
Crisis Of Representation ◽  
Female Legislators ◽  
Female President

Jennifer M. Piscopo examines how the crisis of representation in Costa Rica has placed a ceiling on gender equality in representation. The restructuring of the Costa Rican party system and party fragmentation has made electing multiple candidates from any one ballot more difficult. Top spots have become even more prestigious and more likely to be allocated to men, which reduces women’s electoral chances. Corruption scandals, party breakdown, citizen frustration, and economic problems tainted the administration of the nation’s first female president, Laura Chinchilla. Female legislators have often worked to promote women’s issues and feminist policies, but Chinchilla eschewed feminism, even though several of her policies did benefit women. Overall, her failed presidency may create difficulties for other women seeking top political offices and could have negative consequences for views of women in politics. These challenges notwithstanding, Piscopo concludes that Costa Rica remains at the vanguard of women’s political representation in Latin America.

scholarly journals Secondary prevention medication persistence and prognosis of acute ischaemic stroke or transient ischaemic attack

2021 ◽  
pp. svn-2020-000471
Author(s):  
Lei Zhang ◽  
Junfeng Shi ◽  
Yuesong Pan ◽  
Zixiao Li ◽  
Hongyi Yan ◽  
...  
Keyword(s):  
Secondary Prevention ◽  
Ischaemic Stroke ◽  
Acute Ischaemic Stroke ◽  
Transient Ischaemic Attack ◽  
Recurrent Stroke ◽  
Medication Persistence ◽  
Level Ii ◽  
Composite Events ◽  
Ischaemic Attack ◽  
Level I

IntroductionThe risk of disability and mortality is high among recurrent stroke, which highlights the importance of secondary prevention measures. We aim to evaluate medication persistence for secondary prevention and the prognosis of acute ischaemic stroke or transient ischaemic attack (TIA) in China.MethodsPatients with acute ischaemic stroke or TIA from the China National Stroke Registry II were divided into 3 groups based on the percentage of persistence in secondary prevention medication classes from discharge to 3 months after onset (level I: persistence=0%, level II: 0%<persistence<100%, level III: persistence=100%). The primary outcome was recurrent stroke. The secondary outcomes included composite events (stroke, myocardial infarction or death from cardiovascular cause), all-cause death and disability (modified Rankin Scale score=3–5) from 3 months to 1 year after onset. Recurrent stroke, composite events and all-cause death were performed using Cox regression model, and disability was identified through logistic regression model using the generalised estimating equation method.Results18 344 patients with acute ischaemic stroke or TIA were included, 315 (1.7%) of whom experienced recurrent strokes. Compared with level I, the adjusted HR of recurrent stroke for level II was 0.41 (95% CI 0.31 to 0.54) and level III 0.37 (0.28 to 0.48); composite events for level II 0.41 (0.32 to 0.53) and level III 0.38 (0.30 to 0.49); all-cause death for level II 0.28 (0.23 to 0.35) and level III 0.20 (0.16–0.24). Compared with level I, the adjusted OR of disability for level II was 0.89 (0.77 to 1.03) and level III 0.82 (0.72 to 0.93).ConclusionsPersistence in secondary prevention medications, especially in all classes of medications prescribed by the physician, was associated with lower hazard of recurrent stroke, composite events, all-cause death and lower odds of disability in patients with acute ischaemic stroke or TIA.

scholarly journals Formación docente inicial y acción socioeducativa: Construyendo una propuesta de implementación del Programa Maestros Comunitarios (PMC)

2017 ◽  
Vol 22 (1) ◽  
pp. 1
Author(s):  
Paulette Barberousse-Alfonso ◽  
Marie Claire Vargas-Dengo ◽  
Pamela Corrales-Bastos
Keyword(s):  
Costa Rica ◽  
Elementary Education ◽  
Costa Rican ◽  
School Dropouts ◽  
Educational Models ◽  
Code Number ◽  
National University ◽  
Community Pedagogy ◽  
Transformative Approach ◽  
Career Program

From a critical and transformative approach, this essay presents inputs and relevant conclusions obtained during the first stage of the project Construyendo una propuesta de implementación del Programa Maestros Comunitarios (PMC), Code number 0166-15 DEB-UNA (UNA, DEB, s. f.), conducted in 2016. Considering our perspective as researchers and professors at División de Educación Básica, the paper addresses a current topic within the socio-educative field to face challenges of contemporary educational models in formal and non-formal areas of elementary education in the Costa Rican context. Our purpose is that students and teachers of the career program Pedagogía con énfasis en I y II ciclos de la Educación General Básica have an overview of the national, social, and educational reality in an attempt to involve them in applying pedagogical actions towards finding a solution to school dropouts at Escuela Finca Guararí, Heredia, Costa Rica. The essay describes the experience of teaching education students and their socio-educational action with the focus on the systematization of the experience in the initial stage of the project. Furthermore, the paper connects with emerging strategic knowledge areas at División de Educación Básica (DEB), such as social and community pedagogy in the context of the National University (UNA) of Costa Rica. It takes over a route already traced at DEB, which proposes more flexible and alternative pedagogic formats to promote educational equity and diversity issues. The paper describes the project background and a theoretical framework, as well as aspects that have been shared by the protagonist actors along the process: students-teachers, host teachers, supervisor professors, school children, and their parents at Escuela Finca Guararí. Conclusions address main results and facts during 2016 in order to show the viability of the project, which is conducted from a public university. Finally, the article also includes an overview of the project’s future in terms of its implementation in the Costa Rican context.

Costa Rica in 1948: Cold War or Local War?

1996 ◽  
Vol 52 (4) ◽  
pp. 465-493 ◽  
Author(s):  
Marcia Olander
Keyword(s):  
Latin America ◽  
Cold War ◽  
Costa Rica ◽  
Critical Role ◽  
Costa Rican ◽  
Panama Canal Zone ◽  
First Case ◽  
The Government ◽  
The Cold War ◽  
The U.S

The years following World War Two produced a strong resurgence of U.S. intervention in Central America and the Caribbean couched in Cold War terms. Although the U.S. intervention in Guatemala to overthrow the government of Jacobo Arbenz in 1954 has generally been seen as the first case of Cold War covert anti-Communist intervention in Latin America, several scholars have raised questions about U.S. involvement in a 1948 Costa Rican civil war in which Communism played a critical role. In a 1993 article in The Americas, Kyle Longley argued that “the U.S. response to the Costa Rican Revolution of 1948, not the Guatemalan affair, marked the origins of the Cold War in Latin America.” The U.S. “actively interfered,” and achieved “comparable results in Costa Rica as in Guatemala: the removal of a perceived Communist threat.” Other authors have argued, even, that the U.S. had prepared an invasion force in the Panama Canal Zone to pacify the country. The fifty years of Cold War anti-Communism entitles one to be skeptical of U.S. non-intervention in a Central American conflict involving Communism. Costa Ricans, aware of a long tradition of U.S. intervention in the region, also assumed that the U.S. would intervene. Most, if not all, were expecting intervention and one key government figure described U.S. pressure as like “the air, which is felt, even if it cannot be seen.” Yet, historians must do more than just “feel” intervention. Subsequent Cold War intervention may make it difficult to appraise the 1948 events in Costa Rica objectively. Statements like Longley's that “it is hard to believe that in early 1948 … Washington would not favor policies that ensured the removal of the [Communist Party] Vanguard,” although logical, do not coincide with the facts of the U.S. role in the conflict.

Source depth estimation using multi-station waveform data

1984 ◽  
Vol 74 (5) ◽  
pp. 1623-1643
Author(s):  
Falguni Roy
Keyword(s):  
Depth Estimation ◽  
The United States ◽  
Digital Data ◽  
United States Geological Survey ◽  
Travel Times ◽  
Source Depth ◽  
Time Data ◽  
Waveform Data ◽  
Level Ii ◽  
Level I

Abstract A depth estimation procedure has been described which essentially attempts to identify depth phases by analyzing multi-station waveform data (hereafter called level II data) in various ways including deconvolution, prediction error filtering, and spectral analysis of the signals. In the absence of such observable phases, other methods based on S-P, ScS-P, and SKS-P travel times are tried to get an estimate of the source depth. The procedure was applied to waveform data collected from 31 globally distributed stations for the period between 1 and 15 October 1980. The digital data were analyzed at the temporary data center facilities of the National Defense Research Institute, Stockholm, Sweden. During this period, a total number of 162 events in the magnitude range 3.5 to 6.2 were defined by analyzing first arrival time data (hereafter called level I data) alone. For 120 of these events, it was possible to estimate depths using the present procedure. The applicability of the procedure was found to be 100 per cent for the events with mb &gt; 4.8 and 88 per cent for the events with mb &gt; 4. A comparison of level I depths and level II depths (the depths as obtained from level I and level II data, respectively) with that of the United States Geological Survey estimates indicated that it will be necessary to have at least one local station (Δ &lt; 10°) among the level I data to obtain reasonable depth estimates from such data alone. Further, it has been shown that S wave travel times could be successfully utilized for the estimation of source depth.

Vaccine effectiveness of Pfizer-BioNTech and Oxford-AstraZeneca to prevent severe COVID-19 in Costa Rica: A nationwide, observational study of hospitalizations prevalence (Preprint)

2021 ◽  
Author(s):  
Luis Rosero-Bixby
Keyword(s):  
Single Dose ◽  
Costa Rica ◽  
Observational Study ◽  
Real World ◽  
Vaccine Coverage ◽  
Secondary Analysis ◽  
Vaccine Effectiveness ◽  
Costa Rican ◽  
Vaccination Program ◽  
Severe Illness

BACKGROUND The Costa Rican vaccination program uses Pfizer-BioNTech and Oxford-AstraZeneca vaccines. Real-world estimates of these vaccines effectiveness to prevent hospitalizations range from 90% to 98% for two doses and from 70% to 91% for a single dose. Almost all of these estimates predate the Delta variant. OBJECTIVE To estimate the dose-dependent effectiveness of coronavirus disease (COVID-19) vaccines to prevent severe illness in real-world conditions of Costa Rica, after the Delta variant became dominant. METHODS This observational study is a secondary analysis of hospitalizations prevalence. The participants are all 3.67 million adults residents in Costa Rica by mid-2021. The study is based on public aggregated data of 5978 COVID-19-related hospital records from 14th September to 20th October, 2021 and 6.1 million vaccination doses administered to determine hospitalization prevalence by dose-specific vaccination status. The intervention retrospectively evaluated is vaccination with Pfizer-BioNTech (78%) and Oxford-AstraZeneca (22%). The main outcome studied is being hospitalized. RESULTS Vaccine effectiveness to prevent hospitalization (VEH) was estimated as 93.4% (95% confidence interval [CI]: 93.0 to 93.9) for complete vaccination and 76.7% (CI: 75.0 to 78.3) for single-dose vaccination among adults of all ages. VEH was lower and more uncertain among older adults aged 58 years and above: 92% (CI: 91% to 93%) for those who had received full vaccination and 64% (CI: 58% to 69%) for those who had received partial vaccination. Single-dose VEH declined over time during the study period, especially in the older age group. Estimates were sensitive to possible errors in the population count used to determine the residual number of unvaccinated people when vaccine coverage is high. CONCLUSIONS The Costa Rican vaccination program that administered Pfizer and Oxford vaccines are highly effective to prevent COVID-19-related hospitalizations after the Delta variant had become dominant. Moreover, a single dose is reasonably effective, justifying the continuation of the national policy of postponing the application for the second dose of the Pfizer vaccine to accelerate the vaccination and increase the number of people being vaccinated. Timely monitoring of vaccine effectiveness is important to detect eventual failures and motivate the public based on information that the vaccinations are effective.

Checklist and key of New World species of Omiodes Guenée with descriptions of four new Costa Rican species (Lepidoptera: Crambidae)

1997 ◽  
Vol 28 (4) ◽  
pp. 471-492 ◽  
Author(s):  
Patricia Gentili ◽  
M. Alma Solis
Keyword(s):  
New Species ◽  
Costa Rica ◽  
Type Species ◽  
New World ◽  
Costa Rican ◽  
New Combination ◽  
World Species

AbstractOmiodes Guenée is redescribed based on all New World species, including the type species O. humeralis Guenée. Four new species from Costa Rica, O. janzeni sp. n., O. hallwachsae sp. n., O. sirena sp. n., O. ochracea sp. n., are described. Ten new synonymies are established : Phostria disciiridescens Hampson is =O. croeceiceps (Walker), Phostria cayennalis Schaus is =O. grandis (Druce), Omiodes ochrosoma Felder & Rogenhofer and Phryganodes gazalis Schaus are =O. pandaralis (Walker), Nacoleia lenticurvalis Hampson, Phryganodes anchoritalis Dyar, and Phostria duplicata Kaye are =O. confusalis (Dognin), O. cervinalis Amsel is =O. martvralis (Lederer), Nacoleia indicata ab. pigralis Dognin and Botis fortificalis Möschler are =O. metricalis (Möschler). One new combination is recognized: O. pandaralis (Walker) was transferred from Coelorhynchidia Hampson. A key and an updated checklist to the neotropical Omiodes species is provided, including O. indicata (Fabricius), a worldwide pest. Ten species that do not belong in Omiodes are retained until appropriate generic placements are identified.

scholarly journals Factors associated with interhospital transfer of children with respiratory failure from level II to level I pediatric intensive care units

2015 ◽  
Vol 30 (5) ◽  
pp. 1080-1084 ◽  
Author(s):  
Folafoluwa O. Odetola ◽  
Sarah J. Clark ◽  
James G. Gurney ◽  
Janet E. Donohue ◽  
Achamyeleh Gebremariam ◽  
...  
Keyword(s):  
Intensive Care ◽  
Respiratory Failure ◽  
Intensive Care Units ◽  
Pediatric Intensive Care ◽  
Pediatric Intensive Care Units ◽  
Factors Associated ◽  
Interhospital Transfer ◽  
Level Ii ◽  
Level I
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