Principal part of multi-parameter displacement functions

AbstractIn this paper we investigate planar polynomial multi-parameter deformations of Hamiltonian vector fields. We study first all coefficients in the development of the displacement function on a transversal to the period annulus. We show that they can be expressed through iterated integrals, whose length is bounded by the degree of the monomials.A second result expresses the principal terms in the division of the displacement function in the Bautin ideal. More precisely, the principal terms in its division in a reduced basis of the Bautin ideal are given by iterated integrals. Our approach is algorithmic and generalizes Françoise algorithm for one-parameter families

Hidrotermička obrada iverja drva tepe (Laureliopsis philippiana Looser): utjecaj na kemijska i fizička svojstva

The present study consisted in determining the effects of a hygrothermal treatment on wood fibers from the Laureliopsis philippiana Looser species. The fibers were treated in autoclave at 150 °C for 90 minutes at a pressure of 430 kPa, which was generated during the evaporation process of the water in autoclave. Physical properties, color, and water retention capacity of hygrothermically treated and untreated fibers were analyzed. The chemical properties determined were the extractable amount in sodium hydroxide, toluene ethanol, hot and cold water, the cellulose, holocellulose and lignin contents, the pH value, the percentage of volatile and washable acids, and the buffer capacity. In hygrothermically treated fibers, a change of color was detected as well as a reduction in the water retention capacity and an increase in the percentage of extractable, cellulose, lignin and a decrease of holocellulose. Also an increase in acidity, amount of volatile and washable acids and buffer capacity were determined. Due to the chemical changes observed in the treated fibers, these would present advantages in the manufacture of fiberboards, facilitating the setting of the amino resins.Cilj rada bio je utvrditi učinke hidrotermičke obrade na vlakna drva Laureliopsis philippiana Looser. Vlakna su tretirana u autoklavu, na temperaturi 150 °C tijekom 90 minuta, i pri tlaku 430 kPa, koji je nastao tijekom procesa isparavanja vode u autoklavu. Analizirana su fizička svojstva, boja i kapacitet zadržavanja vode u hidrotermički obrađenim i neobrađenim vlaknima. Od kemijskih svojstava određena je ekstrahirana količina u natrijevu hidroksidu, toluen-etanolu te u toploj i hladnoj vodi, zatim sadržaj celuloze, holoceluloze i lignina, pH vrijednost, postotak hlapljivih kiselina i kiselina koje se mogu isprati te kapacitet pufera. U hidrotermički tretiranim vlaknima zabilježena je promjena boje i smanjenje kapaciteta zadržavanja vode te povećanje postotka ekstrakta, sadržaja celuloze i lignina, kao i smanjenje sadržaja holoceluloze. Također je utvrđeno povećanje kiselosti, količine hlapljivih kiselina i kiselina koje se mogu isprati te određen kapacitet pufera. Zbog kemijskih promjena uočenih na obrađenim vlaknima takva bi vlakna mogla imati prednost u proizvodnji ploča vlaknatica jer olakšavaju pozicioniranje amino smola

renovation of annals of hepatology s scientific scope towards preventing rather than treating end stage liver disease

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Contaminación de los ambientes acuáticos generados por la industria textil

La industria textil es, después de la industria del petróleo, la segunda industria más contaminante del medio ambiente y sobre todo, de la que no se tiene tanta conciencia. El sector textil y confecciones es un negocio complejo ya que involucra largas y variadas cadenas de suministro de producción, materias primas, fabricación de textiles, diseño de prendas de vestir, envío, ventas, uso y finalmente, la disposición final de la prenda. En 2015 la población mundial ha alcanzado los 7.400 millones de personas y el consumo textil per cápita llegó a los 13,1 kg/hab/año. La cantidad de agua necesaria para fabricar las prendas que vestimos varían de acuerdo a la fibra textil y colorante usados: Un par de jean de algodón con colorantes índigos, necesita un mínimo de 42 litros de agua para ser teñidos, lavados y acabados. Una vez en casa, empleamos más agua, cuidándolos; usando, 21 litros cada vez que los lavamos. La industria textil tiene como principales impactos ambientales el alto consumo del recurso agua y las aguas residuales con alta carga contaminante que se generan en los diversos procesos. En la investigación se revisó la problemática de la industria textil, específicamente en el ramo del agua y los diversos enfoques para reducir la contaminación del agua que van desde la reducción en la fuente, recuperación (reuso y reciclaje), tratamiento centralizado de efluentes y separación de ciertos baños de proceso para tratamiento individual o reutilización

Effect of an intervention based on child-care centers to reduce risk behaviors for obesity in preschool children

AbstractBackgroundPreschool age is a critical stage for health promotion and prevention of obesity, which is an emerging public health problem in children. The aim of this study was to design and evaluate the effect of a multifaceted intervention based on child-care centers to reduce risk behaviors for obesity among preschool children.MethodsA 12-month cluster-randomized community trial was conducted in 16 Mexican Institute of Social Security child-care centers in Mexico City. Children between 2 and 4 years of age enrolled in the selected child-care centers participated in the study. Intervention comprised 12 weekly curriculum sessions for the children, and six family workshops. Changes in children’s dietary and physical activity, food availability at home, and maternal feeding styles were determined after 6 and 12 months. Changes within groups among stages, and between groups by stage were analyzed through X2 test.ResultsThe intervention showed a decrease of home availability for some non-recommended foods and an increase in physical activity in the intervention group compared to the control group.ConclusionsImprovement in physical activity can be effective in the long term; innovative strategies aimed to modify family dietary risk behaviors are required

Presence of Chlamydia, Mycoplasma, Ureaplasma, and Other Bacteria in the Upper and Lower Genital Tracts of Fertile and Infertile Populations

Objective: The genital mycoplasmas (Mycoplasma hominis and Ureaplasma urealyticum) and Chlamydia trachomatis have been implicated as possible etiologic factors in infertility. Their role in patients with infertility needs to be further defined

Tests for Waterproofing Materials, Made of Opuntia ficus-indica

Cacti are thoroughly found all across the Mexican Territory. In the mountain ranges, and sierras. The cactus known as Opuntia ficus-indica grows naturally in the State of Mexico. Cacti have been used for millennia for multiple purposes. From culinary, to art involving other materials such as calcium oxide and salt. There are about 300 different species of cacti around the globe. About 100 are found in Mexico. Extensive research has been made and often, new and innovative uses are discovered. This paper features another use for Opuntia ficus-indica: Waterproofing on building surfaces exposed to the elements (i.e. Sunlight and humidity). This paper shows the process involving six stages using Opuntia ficus-indica combined with different natural materials were experimented with, and tested by evaluating their unique performance.Mexican cacti have captivated the scientific community due their extraordinary characteristics and benefits.This research established a new way to use this ancestral plant as a substitute for other construction materials that given their industrial and technological processes have -in several cases- skyrocketed their costs, besides of being a constant hazard for the environment. Thus, by looking back how ancestors used to solve their construction needs, it would ultimately allow us to find better ways to protect the environment. Production process is analyzed; experimented with it; and its prominent characteristics analyzed derived from Opuntia ficus-indica extract combined with other natural materials to be then used it as a waterproofing material

Visibilidad de los servicios de alfabetización informacional de las bibliotecas universitarias españolas según sus webs: diseño y validación de un programa de autoevaluación

A new evaluation and self-evaluation tool designed to measure the degree of visibility of the information literacy (infolit) services of Spanish academic libraries according to their websites is presented, together with the results of its application between October 2019 and February 2020. Building on the state of the art established by international organizations and the most prominent scholars in the field, the Metrics for Library Information Literacy (MeLIL) questionnaire also incorporates emerging problems in contemporary information literacy such as mobile learning, fake news, data literacy, transparency, and open science, among others. MeLIL is made up of six criteria and 38 indicators. After a pilot project with eight libraries to validate the questionnaire, the content of the websites on information literacy programs of the 78 Spanish academic libraries was analyzed. The results confirm the validity and transferability of the instrument to measure the level of development of infolit in Spanish academic libraries according to their websites. Furthermore, the progress made in the training and infolit services offered by Spanish academic libraries is systematically described

Oportunidad diagnóstica de la displasia de la cadera en desarrollo: Diferencia entre el sistema de seguridad social en salud contributivo y los sistemas de medicina prepagada y particular en Bogotá

Introducción: El objetivo principal del estudio es determinar si existe diferencia en la oportunidad diagnóstica de la displasia de la cadera en desarrollo (DHD) entre pacientes pertenecientes al sistema general de seguridad social contributivo (SGSS-RC), los afiliados a empresas promotoras de salud (EPS) y los pacientes que acuden a consultorios privados con seguros de medicina prepagada, empresas y pacientes particulares (MPPP). Materiales y métodos: Se realizó un estudio de corte transversal en pacientes que asisten a la consulta de ortopedia infantil y a quienes se les diagnostica por primera vez DHD en el Hospital Infantil Universitario de San José y en tres consultorios particulares de ortopedistas infantiles. Se evalúa y compara la prevalencia de diagnóstico oportuno teniendo en cuenta la edad del paciente al momento de la toma de la primera radiografía de caderas y la edad del diagnóstico ortopédico. Resultados: Se halló una diferencia amplia y estadísticamente significativa entre los pacientes con EPS (88,7 % de diagnóstico tardío) y aquellos provenientes de los consultorios privados (35 % de diagnóstico tardío). El riesgo de diagnóstico tardío fue 14,6 veces mayor en los pacientes con EPS versus los pacientes de consultorio privado (OR de 14,6; IC 95 % de 5,3 a 40,5). Discusión: Con base en la evidencia científica publicada puede considerarse que los pacientes de las EPS estarían más expuestos a tratamientos más riesgosos y costosos, así como a resultados menos satisfactorios y a un peor pronóstico.Introduction: The goal of the study is to determine whether a difference exists in the timing for the diagnosis of developmental hip dysplasia (DHD) among patients belonging to the Colombian contributory social security system and patients from the private practice (prepaid medical insurances, companies and private patients). Methods: This is a cross-sectional study of patients attending pediatric orthopedic outpatient clinic that were diagnosed with DHD. The data were collected from the Hospital Infantil de San José and from three private offices of three pediatric orthopedic surgeons in Bogotá. The prevalence of early diagnosis was assessed taking into account the patient's age at the time of the first X rays of the hips and the first pediatric orthopedic consultation. Results: The data were compared and a big and statistically significant difference was found: 88.7 % of patients belonging to the Colombian contributory social security system had a late diagnosis versus 35 % of patients belonging to the private medicine. The risk of a late diagnosis was 14.6 times greater in patients from the Colombian security system compared with from the patients from the private practice (OR 14.6; 95 % CI 5.3 to 40.5). Discussion: Based on published scientific evidence it can be considered that the patients from the Colombian security system with DDH are more prone to be late diagnosed and have a higher risky and more expensive treatments, as well as less successful and worse prognosis