Effects of splitter Blade Length on disc pump performance

The disc pump operates using boundary layer principle and viscous drag with a relatively low efficiency. There are methods to increase head and efficiency, one of them is the placing of blades sectors or splitter blades in discs. This method has been applied only in the low viscosity fluids pumping (v < 0.1 stokes). This study describe an experimental research in a hight viscocity fluid (v = 2 stokes) with exit angle (32 = 35° and different splitter blades Lengths (Ls) (75, 50, 25%). The purpose is to determinate the splitter blades length that achieves the most effective combination between the blade effect and boundary layer effect in order to increase the energy transmission efficiency from the impeller to the fluid. As result, it can be established that the use of spliter blades is an alternative to increase the performance of the disc pump. The highest efficiency and head were obtained for the gapsize between two discs (b) of 12 mm using a 50% spliter blades length of the main blade length

Investigación en Matemáticas, Economía, Ciencias Sociales y Agronomía

Cada trabajo del libro incluye conclusiones para los interesados en las temáticas aludidas y en ellos nos enteramos de aspectos como los siguientes: - El mayor incremento del precio de los insumos como el maíz, sorgo y en menor medida desperdicio de pan, en relación con el menor crecimiento del precio del ganado en pie, dará como consecuencia un desabasto de carne bovina. - El agua es un recurso primordial en las zonas áridas y semiáridas de México, en tanto que su aporte limita la producción de la agricultura. En este estudio se observó que el precio real del agua es muy bajo en relación a otras zonas agrícolas del mundo. - Hoy en día en el país se consumen alrededor de 718 mil barriles diarios de gasolinas, un aproximado de 113.7 millones de litros, una cantidad tan grande que nuestro país se ve en la necesidad de importar cerca del 39 % de las gasolinas que consumimos. - Los jaliscienses radicados en Estados Unidos tienen una mayor capacidad de financiamiento del bienestar en la entidad, que el propio gobierno de ese estado. - México continuará basando sus finanzas públicas y su política de desarrollo económico en la extracción de combustibles fósiles (petróleo). Este modelo acelerará el deterioro y agotamiento de los recursos naturales. -La importancia de la agricultura orgánica radica en que retoma los tres ámbitos de la sustentabilidad; el ámbito ambiental, el económico y el social. - Es fundamental motivar la organización de los productores de haba para que ellos puedan captar una mayor proporción de los altos márgenes de precios que los consumidores están dispuestos a pagar. - Las condiciones del clima afectan a la producción agraria. Debido al fenómeno de cambio climático, es necesario contar con herramientas informáticas que proporcionen información climatológica para poder tomar medidas preventivas a favor de una mayor cantidad y calidad de producción. La herramienta de software permite la consulta del clima por localidades evitando la necesidad de contar con una estación meteorológica

Effects of Splitter Blade Length on Disc Pump Performance

The disc pump operates using boundary layer principle and viscous drag with a relatively low efficiency. There are methods to increase head and efficiency, one of them is the placing of blades sector sor splitter blades in disc. This method has been applied only in the low viscosity fluids pumping (v<0.1 stokes). This study describe an experimental rescarch in a hight viscosity fluid (v=2 stokes) with exit angle β2 = 35° and different splitter blades Lengths (Ls) (75, 50, 25%). The prupose is to determinate the splitter blades length that achieves the most effective combination between the blade effect and boundary layer effect in order to increase the energy transmission efficiency from the impeller to the fluid. As result, it can be established that the use of spliter blades is an alternative to increase the performance of the fluid. As result, it can be established that the use of spliter blades is an alternative to increase the performance of the disc pump. The highest efficiency and head were obtained for the gapsize between two disc (b) of 12 mm using a 50% spliter blades length of the man blade length

Assessment of the Technological and Environmental Factors Influencing the Ultra-High-Pressure Water Jetting Treatment of the Surface of Naval Construction Steel Against Corrosion

This research defines the best combination of factors (wáter pressure, the use or non-use of washing with fresh water after process, environmental factors (i.e., temperature, humidity, etc.) and type of epoxy Paint) for the high pressure water jetting treatment of naval steels to guarantee the best performance against corrosión. Results show that the epoxy/iron oxide Paint had the best performance when: a water-jetting pressure of 275.8 MP a is used, followed by a low pressure freshwater cleaning. Results also show the best results when the process is developed at the highest environmental temperatures and lowest humidity

Programas de ejercicio físico acuáticos para la prevención de caídas en los mayores. Revisión bibliográfica

Background: The physiological changes of aging increase the risk of falls up to 10 times in people over 65 years. Exercise programs in the aquatic environment could be the alternative to those performed on land, minimizing this risk. Few studies have evaluated the effect of aquatic exercise on balance in the elderly. The need to study whether through the implementation of physical exercise programs in the aquatic environment could reduce the risk of falls is manifested. Objectives: To analyze the scientific literature on studies conducted in the aquatic environment and to verify the effectiveness in improving the parameters related to balance and functionality, and therefore, the lower risk of falls in the elderly, through the practice of exercises. Method: We analyzed 18 articles published in scientific journals, searched in the databases PubMed, Scopus, Science Direct and Social Abstracts under the topics of "elderly" AND "aquatic exercise". These works went through the selection filter, which consisted in the elimination of duplicates, the existence of both topics in the title, only older people participated and they covered the objective of this study and whose publication year exceeded 2008. The study population was physically active in the aquatic environment, whose age was> 65 years. The studies of the single group were taken into account, but also those that formalized two groups, as well as those studies that showed statistically, through the use of the computer program (SPSS), the positive influence of the training in the aquatic environment with the improvement of the balance or functionality. Results: Exercise in the aquatic environment provides benefits in muscle strength, increased cognitive capacity, increased flexibility, improved flexibility and balance, and can reduce the risk of falls in its practitioners. Conclusions: The work of balance in the aquatic environment reduces the risk of fallsFundamento: As alterações fisiológicas do envelhecimento aumentam o risco de quedas em até 10 vezes em pessoas com mais de 65 anos. Programas de exercícios no meio aquático podem ser a alternativa aos praticados em terra, minimizando esse risco. Poucos estudos avaliaram o efeito do exercício aquático no equilíbrio em idosos. A necessidade de estudar se através da implementação de programas de exercícios físicos no meio aquático poderia reduzir o risco de quedas se manifesta. Objetivos: Analisar a literatura científica sobre os estudos no ambiente aquático e testar a eficácia na melhoria dos parâmetros relacionados com o equilíbrio e funcionalidade, e, portanto, menor risco de quedas em pessoas idosas, através da prática exercícios Método: 18 artigos publicados em revistas científicas foram analisadas, procurou no PubMed, Scopus, Science Direct e dados Resumos sociais sob os temas de "idosos" e "exercícios aquáticos". Estas obras passou o filtro de seleção, que consistiu na remoção duplicatas, existência de ambos os tópicos no título, apenas a idosos participando e cobriu o objetivo deste estudo e ano de publicação que ultrapassou 2.008. A população do estudo era fisicamente ativa no meio aquático, com idade> 65 anos. estudos único grupo foram levados em conta, mas também aqueles que formalizou dois grupos, bem como os estudos que mostram estatisticamente, utilizando o software (SPSS), a influência positiva da formação no ambiente aquático com melhor equilíbrio ou funcionalidade. Resultados: Exercício no ambiente aquático traz benefícios na força muscular, aumento da capacidade cognitiva, aumento flexibildiad, melhorando a flexibilidade e equilíbrio, pode reduzir o risco de quedas praticantes. Conclusões: O trabalho de equilíbrio no meio aquático reduz o risco de quedas.Antecedentes: Los cambios fisiológicos del envejecimiento aumentan el riesgo de caídas hasta en 10 veces en las personas mayores de 65 años. Los programas de ejercicio en el medio acuático podrían ser la alternativa a los realizados en tierra, minimizando este riesgo. Pocos estudios han evaluado el efecto del ejercicio acuático en el equilibrio en los mayores. Se manifiesta la necesidad de estudiar si mediante la realización de programas de ejercicio físico en el medio acuático se podría reducir el riesgo de caídas. Objetivos: Analizar la literatura científica sobre estudios realizados en el medio acuático y comprobar la eficacia en la mejora de los parámetros relacionados con el equilibrio y funcionalidad, y, por tanto, el menor riesgo de caídas en las personas mayores, a través de la práctica de ejercicios. Método: Se analizaron 18 artículos publicados en revistas científicas, buscados en las bases de datos PubMed, Scopus, Science Direct y Social Abstracts bajo los tópicos de “elderly” AND “aquatic exercise”. Estos trabajos pasaron el filtro de selección, que consistía en eliminación de duplicados, existencia de ambos tópicos en el título, sólo participaban personas mayores y abarcaban el objetivo de este estudio y cuyo año de publicación superaban el 2008. La población de estudio realizaba actividad física en el medio acuático, cuya edad era >65 años. Se tuvieron en cuenta los estudios de grupo único, pero también aquellos que formalizaron dos grupos, así como aquellos estudios que demostraban estadísticamente, mediante la utilización del programa estadístico, la influencia positiva del entrenamiento en el medio acuático con la mejora del equilibrio o funcionalidad. Resultados: El ejercicio en el medio acuático aporta beneficios en la fuerza muscular, aumento de la capacidad cognitivo, mejora de la flexibilidad y equilibrio, pudiendo disminuir el riesgo de caídas en sus practicantes. Conclusiones: El trabajo de equilibrio en el medio acuático disminuye el riesgo de caída

How do women living with HIV experience menopause? Menopausal symptoms, anxiety and depression according to reproductive age in a multicenter cohort

CatedresBackground: To estimate the prevalence and severity of menopausal symptoms and anxiety/depression and to assess the differences according to menopausal status among women living with HIV aged 45-60 years from the cohort of Spanish HIV/AIDS Research Network (CoRIS). Methods: Women were interviewed by phone between September 2017 and December 2018 to determine whether they had experienced menopausal symptoms and anxiety/depression. The Menopause Rating Scale was used to evaluate the prevalence and severity of symptoms related to menopause in three subscales: somatic, psychologic and urogenital; and the 4-item Patient Health Questionnaire was used for anxiety/depression. Logistic regression models were used to estimate odds ratios (ORs) of association between menopausal status, and other potential risk factors, the presence and severity of somatic, psychological and urogenital symptoms and of anxiety/depression. Results: Of 251 women included, 137 (54.6%) were post-, 70 (27.9%) peri- and 44 (17.5%) pre-menopausal, respectively. Median age of onset menopause was 48 years (IQR 45-50). The proportions of pre-, peri- and post-menopausal women who had experienced any menopausal symptoms were 45.5%, 60.0% and 66.4%, respectively. Both peri- and post-menopause were associated with a higher likelihood of having somatic symptoms (aOR 3.01; 95% CI 1.38-6.55 and 2.63; 1.44-4.81, respectively), while post-menopause increased the likelihood of having psychological (2.16; 1.13-4.14) and urogenital symptoms (2.54; 1.42-4.85). By other hand, post-menopausal women had a statistically significant five-fold increase in the likelihood of presenting severe urogenital symptoms than pre-menopausal women (4.90; 1.74-13.84). No significant differences by menopausal status were found for anxiety/depression. Joint/muscle problems, exhaustion and sleeping disorders were the most commonly reported symptoms among all women. Differences in the prevalences of vaginal dryness (p = 0.002), joint/muscle complaints (p = 0.032), and sweating/flush (p = 0.032) were found among the three groups. Conclusions: Women living with HIV experienced a wide variety of menopausal symptoms, some of them initiated before women had any menstrual irregularity. We found a higher likelihood of somatic symptoms in peri- and post-menopausal women, while a higher likelihood of psychological and urogenital symptoms was found in post-menopausal women. Most somatic symptoms were of low or moderate severity, probably due to the good clinical and immunological situation of these women

Multiplicity dependence of light (anti-)nuclei production in p–Pb collisions at sNN=5.02 TeV

The measurement of the deuteron and anti-deuteron production in the rapidity range −1 < y < 0 as a function of transverse momentum and event multiplicity in p–Pb collisions at √sNN = 5.02 TeV is presented. (Anti-)deuterons are identified via their specific energy loss dE/dx and via their time-of- flight. Their production in p–Pb collisions is compared to pp and Pb–Pb collisions and is discussed within the context of thermal and coalescence models. The ratio of integrated yields of deuterons to protons (d/p) shows a significant increase as a function of the charged-particle multiplicity of the event starting from values similar to those observed in pp collisions at low multiplicities and approaching those observed in Pb–Pb collisions at high multiplicities. The mean transverse particle momenta are extracted from the deuteron spectra and the values are similar to those obtained for p and particles. Thus, deuteron spectra do not follow mass ordering. This behaviour is in contrast to the trend observed for non-composite particles in p–Pb collisions. In addition, the production of the rare 3He and 3He nuclei has been studied. The spectrum corresponding to all non-single diffractive p-Pb collisions is obtained in the rapidity window −1 < y < 0 and the pT-integrated yield dN/dy is extracted. It is found that the yields of protons, deuterons, and 3He, normalised by the spin degeneracy factor, follow an exponential decrease with mass number

Konkurenční analýza stavebního spoření

Seznámení s problematikou stavebního spoření a jeho využití při řešení bytové situace. Porovnání současných podmínek s podmínkami platnými do 31.12.2003. Zhodnocení dané problematiky u jednotlivých staveních spořitelen. Zhodnocení SS do budoucna a jeho dopady do státního rozpočtu

Combined dark matter searches towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS

Cosmological and astrophysical observations suggest that 85\% of the total matter of the Universe is made of Dark Matter (DM). However, its nature remains one of the most challenging and fundamental open questions of particle physics. Assuming particle DM, this exotic form of matter cannot consist of Standard Model (SM) particles. Many models have been developed to attempt unraveling the nature of DM such as Weakly Interacting Massive Particles (WIMPs), the most favored particle candidates. WIMP annihilations and decay could produce SM particles which in turn hadronize and decay to give SM secondaries such as high energy $\gamma$ rays. In the framework of indirect DM search, observations of promising targets are used to search for signatures of DM annihilation. Among these, the dwarf spheroidal galaxies (dSphs) are commonly favored owing to their expected high DM content and negligible astrophysical background. In this work, we present the very first combination of 20 dSph observations, performed by the Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS collaborations in order to maximize the sensitivity of DM searches and improve the current results. We use a joint maximum likelihood approach combining each experiment's individual analysis to derive more constraining upper limits on the WIMP DM self-annihilation cross-section as a function of DM particle mass. We present new DM constraints over the widest mass range ever reported, extending from 5 GeV to 100 TeV thanks to the combination of these five different $\gamma$-ray instruments

Species distribution modelling: contrasting presence-only models with plot abundance data

Species distribution models (SDMs) are widely used in ecology and conservation. Presence-only SDMs such as MaxEnt frequently use natural history collections (NHCs) as occurrence data, given their huge numbers and accessibility. NHCs are often spatially biased which may generate inaccuracies in SDMs. Here, we test how the distribution of NHCs and MaxEnt predictions relates to a spatial abundance model, based on a large plot dataset for Amazonian tree species, using inverse distance weighting (IDW). We also propose a new pipeline to deal with inconsistencies in NHCs and to limit the area of occupancy of the species. We found a significant but weak positive relationship between the distribution of NHCs and IDW for 66% of the species. The relationship between SDMs and IDW was also significant but weakly positive for 95% of the species, and sensitivity for both analyses was high. Furthermore, the pipeline removed half of the NHCs records. Presence-only SDM applications should consider this limitation, especially for large biodiversity assessments projects, when they are automatically generated without subsequent checking. Our pipeline provides a conservative estimate of a species’ area of occupancy, within an area slightly larger than its extent of occurrence, compatible to e.g. IUCN red list assessments