bluuebunny/crossref_metadata_2025 huggingface dataset:
Análise da produção escrita de estudantes do ensino superior: uma abordagem semiótica
Authors: Dos Santos Gois Victor Hugo , Pessoa da Silva Karina Alessandra , Dalto Jader Otavio
Published: May 2019

Neste artigo trazemos resultados de uma investigação desenvolvida com alunos de Licenciatura em Química em uma disciplina de Cálculo Diferencial e Integral 1 cujo objetivo foi analisar as produções escritas, por meio dos signos produzidos em atividades que tratavam de funções definidas por mais de uma sentença. Assim, referenciais teóricos que tratam de semiótica, enquanto ciência dos signos, e reflexões a respeito da Análise da Produção Escrita em Matemática subsidiaram nossa análise de cunho qualitativo e interpretativo. As atividades analisadas foram resolvidas em sala de aula e compunham, junto a outras atividades, uma das três provas desenvolvidas ao longo do semestre letivo (regime semestral) e propostas ao final do estudo de um bloco de conteúdos. A prova cujas atividades foram analisadas foi a primeira a ser feita pelos estudantes e avaliava também o estudo de limites e continuidade. Os apontamentos que engendramos têm como premissa os signos escritos produzidos nas resoluções dos estudantes, em que pudemos evidenciar conhecimentos matemáticos, bem como identificar algumas fragilidades quanto ao conhecimento sobre funções definidas por mais de uma sentença.
Polarimetric radar characteristics of lightning initiation and propagating channels
Authors: Figueras i Ventura Jordi , Pineda Nicolau , Besic Nikola , Grazioli Jacopo , Hering Alessandro , van der Velde Oscar A. , Romero David , Sunjerga Antonio , Mostajabi Amirhossein , Azadifar Mohammad , Rubinstein Marcos , Montanyà Joan , Germann Urs , Rachidi Farhad
Published: May 2019

Abstract. In this paper we present an analysis of a large dataset of lightning and
polarimetric weather radar data collected in the course of a lightning
measurement campaign that took place in the summer of 2017 in the area
surrounding Säntis, in the northeastern part of Switzerland.
For this campaign and for the first time in the Alps, a lightning mapping
array (LMA) was deployed. The main objective of the campaign was to study the
atmospheric conditions leading to lightning production with a particular focus
on the lightning discharges generated due to the presence of the 124 m
tall Säntis telecommunications tower. In this paper we relate LMA very high frequency
(VHF)
sources data with co-located radar data in order to characterise the main
features (location, timing, polarimetric signatures, etc.) of both the
flash origin and its propagation path. We provide this type of analysis
first for all of the data and then we separate the datasets into intra-cloud
and cloud-to-ground flashes (and within this category positive and negative
flashes) and also upward lightning. We show that polarimetric weather radar
data can be helpful in determining regions where lightning is more likely to
occur but that lightning climatology and/or knowledge of the orography and
man-made structures is also relevant.
Resolving the effects of 2D versus 3D grain measurements on (U-Th)/
He age data and reproducibility
Authors: Cooperdock Emily H. G. , Ketcham Richard A. , Stockli Daniel F.
Published: May 2019

Abstract. (U-Th)/He thermochronometry relies on accurate and precise quantification of individual grain volume and surface area, which are used to calculate mass, alpha ejection (FT) correction, isotope concentrations, equivalent sphere radius (ESR), and ultimately age. The vast majority of studies use 2D or 3D microscope dimension measurements and an idealized grain shape to calculate these parameters, and a long-standing question is how much uncertainty these assumptions contribute to observed intra-sample age dispersion and accuracy. Here we compare the results for volume, surface area, grain mass, ESR, effective uranium (eU) and FT correction derived from 2D microscope and 3D x-ray computed tomography (CT) length and width data for > 100 apatite grains. We analyzed apatite grains from two samples that exhibited a variety of crystal habits, some with inclusions. We also present 83 new apatite (U-Th)/He ages to assess the influence of 2D versus 3D FT correction on sample age precision. The data illustrate that the 2D approach systematically overestimates grain volumes and surface areas by 20–25 %, impacting the estimates for mass, eU, and ESR – all important parameters used for interpreting age scatter and inverse modeling. FT factors calculated from 2D and 3D measurements differ by ~ 2 %. This variation, however, has effectively no impact on reducing intra-sample age reproducibility. We also present a grain mounting procedure for x-ray CT scanning that can allow 100's of grains to be scanned in a single session, and new software capabilities for 3D FT and FT-based ESR calculations that are robust for relatively low-resolution CT data, that together enable efficient and cost-effective CT-based characterization.
Estimates of tropical cyclone geometry parameters based on best
track data
Authors: Nederhoff Kees , Giardino Alessio , van Ormondt Maarten , Vatvani Deepak
Published: May 2019

Abstract. Parametric wind profiles are commonly applied in a number of engineering applications for the generation of tropical cyclone (TC) wind and pressure fields. Nevertheless, existing formulations for computing wind fields often lack the required accuracy when the TC geometry is not known. This may affect the accuracy of the computed impacts generated by these winds. In this paper, empirical stochastic relationships are derived to describe two important parameters affecting the TC geometry: radius of maximum winds (RMW) and the radius of gale force winds (∆AR35). These relationships are formulated using best track data (BTD) for all seven ocean basins (Atlantic, S/NW/NE Pacific, N/SW/SE Indian Oceans). This makes it possible to a) estimate RMW and ∆AR35 when these properties are not known and b) generate improved parametric wind fields for all oceanic basins. Validation results show how the proposed relationships allow the TC geometry to be represented with higher accuracy than when using relationships available from the literature. Outer wind speeds can be well reproduced by the commonly used Holland wind profile when calibrated using information either from best-track-data or from the proposed relationships. The scripts to compute the TC geometry and the outer wind speed are freely available via Delft Dashboard.
Spatial indicators for desertification in south-east Vietnam
Authors: Hien Le Thi Thu , Gobin Anne , Huong Pham Thi Thanh
Published: May 2019

Abstract. Desertification is influenced by different factors that relate to climate, soil, topography, geology, vegetation, human pressure and land and water management. The quantification of these factors into spatially explicit indicators and subsequent evaluation provides for a framework that allows to identify areas currently at risk of desertification and to evaluate important contributing bio-physical and socio-economic factors. Applied to south-east Vietnam, a baseline 2010 map showed that 14.4 % of the area, mainly along the coast and in the north east, is desertified with another 35.4 % at severe risk of desertification. The Ministry of Environment has defined the area with a ratio of rainfall to evapotranspiration smaller or equal to 0.65, which equals 1,233 km2 or 15 % of the province, as desertified area. The developed framework allows for decision support in a what if structure, and for the projection of potentially vulnerable areas under future scenarios. With projected climate change and current population growth the desertified area is expected to increase with 122 % (or 137,850 ha) towards 2050. The methodology can be extended to neighbouring provinces that experience similar sensitivities to desertification.
Framework to prioritize watersheds for diffuse pollution management
in Korea: application of multicriteria analysis using the Delphi
method
Authors: Lee Gyumin , Jun Kyung Soo , Kang Minji
Published: May 2019

Abstract. This study aimed to develop a risk-based approach for determining control areas to manage non-point source pollution, developing a framework to prioritize catchments by considering the characteristics of polluted runoff from non-point sources. The best management, decision-making, and scientific approaches, such as TOPSIS and Delphi technique, are required for the designation of control areas and the application of the best management practices to the control areas. Multicriteria decision-making methods can handle the diversity and complexity of non-point source pollution. The Delphi technique was employed for selecting the assessment criteria/sub-criteria and determining their weights. Sub-criteria for each catchment unit were scored with either a quantitative or qualitative scale. All non-point pollution sources in South Korea mainland were included, with the exception of a few islands, with catchment prioritization and pollution vulnerability evaluations shown as thematic maps. This study contributes to the field by developing a new risk-based approach for ranking and prioritizing catchments; this provides valuable information for the Ministry of Environment to use to identify control areas and manage non-point source pollution.
Sandbagging versus Sandbag Replacement Systems: Costs, Time,
Helpers, Logistics
Authors: Lankenau Lena , Koppe Bärbel
Published: May 2019

Abstract. The classic aid in operative flood defence is the sandbag. Over the past few decades, though, so-called sandbag replacement systems (SBRS) have also been available for flood fighting. The use of sandbags is time-consuming as well as highly intensive in terms of materials and personnel. In contrast, the use of SBRS entails higher investment costs. However, SBRS are reusable and require lower costs for helpers and logistics, so that the higher investment costs are offset by repeated use. In fictitious but realistic scenarios, the use of sandbags and sandbag replacement systems is compared in order to enable a comparison of requirements such as deployment costs, time and helpers. Three different linear SBRS were compared to a 1.0-metre high and 100-metre long sandbag dam. Furthermore, the dyke defence measures load drain and ring dyke were compared with the comparable SBRS available on the market. All three SBRS clearly show time saving and logistical advantages. Under the assumed conditions, the higher investment costs of the SBRS are already amortised with one subsequent reuse.
A Qualitative Study of Cause-Related Marketing Campaigns and Consumers’ Purchase Intention of On-Demand Ride Services in Egypt
Authors: Shazly Rana Essam , Mahrous Abeer A.
Published: May 2019

Corporate Social Responsibility (CSR) has become a matter of interest for academics and practitioners especially in the form of Cause-Related Marketing (CRM). The paper aims to revisit CRM campaign dimensions shaping consumer responses in terms of attitude toward firms and purchase intention in a less research market such as Egypt. Exploratory qualitative interviews were employed of thirteen in-depth interviews and one focus group (seven participants) with Egyptians using on-demand ride services. The current study shed the lights on the main CRM campaign factors affecting purchase intention and firm attitude. Those factors are cause involvement, consumers’ participation effort, company-cause fit, corporate credibility, altruistic attribution, campaign feedback, socio-demographic dimensions, and skepticism. Results revealed that campaign feedback has a master effect on consumers’ attitudes and purchasing behavior and wasn’t studied heavily in the literature. Also, the importance of the cause itself and how consumers are personally involved in the social issue is of great concern. Consumers’ skepticism and degree of participation effort required from consumers result in negative effects on their attitude toward firms which in turn affect their purchase intention. Yet, managers should inform consumers by how the company is using their donations, additionally; they should hamper consumers’ skepticism and enhance their trust in the socially conscious brands. People have to be updated with the campaign’s achievement and progress on a regular base. Eventually, determining the antecedents of CRM campaigns would help managers in selecting the best partners for an effective social venture.
El amanecer del siglo XX la evolución de la civilización
Authors: Barraza Ibarra Jorge
Published: May 2019

Al comenzar el siglo XX, la agricultura y la producción artesanal características del siglo anterior mantienen su predominio, sin embargo, en los países occidentales se inicia un proceso de industrialización con nuevas técnicas sin precedentes en la historia.A partir de 1896-1897, la economía occidental comienza a expandirse, basada en el aumento en el número de consumidores, en un crecimiento de las inversiones, así como en el aparecimiento de nuevas tecnologías, modificando los antiguos patrones de producción.Es así como empieza a desarrollarse la producción de acero, la electricidad, la generación de petróleo con fines productivos y la industria basada en la química orgánica.
Principales teorías de la interpretación de la ley penal
Authors: Trejo Escobar Miguel Alberto
Published: May 2019

Las normas penales no consisten en un puro "recetario" o en meras " fórmulas" que simplemente se apliquen al caso concreto. Por el contrario, las normas penales, antes de poderlas aplicar a un caso específico al igual que las normas constitucionales, civiles, mercantiles, familiares, laborales, etc., necesitan ser interpretadas fijando el alcance de los textos en que se hallan formuladas.La necesidad de la interpretación de la ley no es un problema que dependa de si el texto es "poco claro", "oscuro" o "contradictorio", sería un error aceptar que sólo en esos casos los textos jurídicos necesitan ser interpretados.
El nuevo analfabetismo y la calidad en la educación
Authors: Orantes Blanca Ruth
Published: May 2019

En El Salvador, existen muchos problemas que superar en materia de educación, aún cuando se han realizado esfuerzos para mejorar el sistema educativo, este sigue lanzando indicadores que visualizan problemas de fondo en materia de calidad, esto lo demuestra el que en la Prueba de Aptitudes y Aprendizajes de Educación Media (PAES) no se han alcanzado calificaciones que reflejan esa calidad en la mayoría de estudiantes, según fuentes del Ministerio de Educación (MINED). Se puede observar en el comportamiento de rendimiento de los bachilleres en la prueba PAES, que no ha sido significativo el adelanto. En el 2008 se obtuvo como nota global 6.17, según datos del MINED.
Necesidades tecnológicas de las Pymes en El Salvador
Authors: Chacón María Laura
Published: May 2019

La investigación fue motivada por conocer aspectos relacionados con el actual nivel tecnológico de la pequeña y mediana empresa salvadoreña (Pymes), en su desarrollo y competitividad local e internacional.Los objetivos de la investigación fueron, entre otros, documentar necesidades de desarrollo tecnológico que limitan a las Pymes a crecer y competir, para ayudar, en el corto plazo, a la aplicación y desarrollo de la mejor tecnología. A su vez, que las prepare a desarrollarse tecnológicamente y ser competitivas a escalas nacional e internacional.
Migrantes como noticia
Authors: Calles Minero Camila
Published: May 2019

La migración ha pasado a formar parte de la agenda de los medios de comunicación, sobre todo en prensa escrita, incluso se han creado secciones exclusivas en esa área. Por ello es importante analizar bajo la lupa de las consideraciones académicas del quehacer periodístico los materiales producidos.En el tema migratorio, los periodistas han establecido fuentes principales: la opinión de emigrantes e inmigrantes, que al final son los protagonistas; y el género más utilizado para publicar la información es la noticia, forma periodística básica para dar datos fríos y sin análisis. Tema migratorio difundido con diferentes prismas establecidos por aspectos como cuestiones legales, muerte, problemas (arrestos, redadas, deportación), leyes, protestas, maltratos, ayuda, política electoral en El Salvador y Estados Unidos, campañas de salud, educación, sida, retorno voluntario, cultura, mujer, niños y adolescentes y la ruta del migrante.El análisis se realizó de noticias publicadas desde junio de 2007 a junio de 2008, en cinco periódicos de El Salvador. Se entrevistó a periodistas y editores que trabajan en el área, con el objetivo de mostrar la imagen que los medios de comunicación construyen y difunde.
Participación ciudadana y estrategias de comunicación en el gobierno central de El Salvador
Authors: Calles Minero Camila
Published: May 2019

¿Qué estrategias de difusión utiliza el gobierno central para promover la participación ciudadana y qué incidencia tiene esta en el acontecer gubernamental?Esta investigación identificó esas estrategias y su inocencia, así como la incidencia de la participación ciudadana en la toma de decisiones del gobierno central de El Salvador. A través de entrevistas en profundidad, se logró establecer que en el gobierno central la participación ciudadana está enfocada en la dimensión de la denuncia; hacen falta mecanismos en los que realmente la población incida en la toma de decisiones gubernamentales. Además, los contados mecanismos de participación que existen no son divulgados adecuadamente, las instancias del gobierno no tienen estrategias de comunicación exclusivas para promoverlos.
Justicia penal juvenil
Authors: López Nuila Jaime
Published: May 2019

Este artículo constituye una importante síntesis de la Justicia Penal Juvenil. Se ha tratado de destacar lo que deberá llamar la atención de la comunidad académica, para que sirva como fuente de consulta a los interesados y estudiosos.
Comportamiento económico reciente de El Salvador
Authors: Rodríguez Loucel Rafael
Published: May 2019

La coyuntura no puede hacer abstracción del antecedente o de los aspectos estructurales que son determinante en el comportamiento económico presente; tampoco un fenómeno económico es aislado; necesariamente es vinculante con lo que acontece en lo político, social y ambiental. Por otra parte, la dependencia de la economía salvadoreña ha sido más obvia en los últimos veinte años, destacándose el ingreso de divisas en concepto de transferencias familiares del exterior y relativamente menos el proveniente de la venta de productos de bienes y servicios. Ese comportamiento es el resultado de una nula productividad y competitividad que no permite ampliar la base productiva y exportadora del país. Los patrones de consumo que no corresponden a los de un país con un nivel de producción bajo, pero si a un ingreso más alto que este último, son consecuentes con una sociedad con un porcentaje importante de sus habitantes que se acostumbran a las remesas y desatienden el nivel de preparación básica y su capacidad propia de asimilar y producir tecnología. La propensión promedio al ahorro y a invertir se han reducido, a lo que se agrega una poca atracción país para la inversión extranjera. Las autoridades gubernamentales tratan de resolver el dilema de captar más ingresos y/o promover la riqueza (capacidad productiva). Finalmente es urgente despolitizar el quehacer del país, que se mueven en un entorno de polarización política que obstaculiza las potencialidades de crecimiento natas, aun cuando no necesariamente efectivas del país.
Internacionalización de la educación superior
Authors: Orantes Blanca Ruth
Published: May 2019

Las universidades se enfrentan a una nueva configuración del orden internacional en el ámbito de países e instituciones. Los modelos de producción innovadores impulsan a la ciencia y la tecnología. Las fronteras están desapareciendo y transformando los valores económicos, además de observar un crecimiento vertiginoso de la información y saberes. Todo lo anterior enfrenta a las universidades a una nueva exigencia, prepararse, crear una cultura para la internacionalización; y sus exigencias: idioma y tecnología de avanzada. Aún cuando se reconozca a importancia de la internacionalización y cooperación, se requiere de planes, acciones y presupuesto para su ejecución. No obstante, la cultura de internacionalización también se debe desarrollar por medio de un modelo que integre la voluntad, la capacidad y la identidad.
Prevalencia de alteraciones afectivas : depresión y ansiedad en la población salvadoreña
Authors: Gutiérrez Quintanilla José Ricardo
Published: May 2019

El presente artículo tiene como objetivo general establecer la prevalencia de las alteraciones afectivas: depresión y ansiedad; así como determinar la incidencia de casos de psicopatología en la población salvadoreña, con el propósito de obtener indicadores del estado de salud mental de los salvadoreños. Para la Organización Mundial de la Salud (OMS), la salud mental es el equilibrio psicológico o mental, físico-fisiológico y social del ser humano. El estudio es ex post facto con diseño retrospectivo; el muestreo es probabilístico por conglomerados, representativo del país. Para evaluar las dimensiones antes señaladas se utilizó el Cuestionario de Salud General (GHQ-28), que posee propiedades psicométricas adecuadas para medir estas variables. Entre los resultados se tiene que la media aritmética es más alta en las mujeres en los ítems del GHQ-28, en comparación con los hombres. En 12 ítems hay diferencias significativas, indicando lo anterior que existe una mayor prevalencia de sintomatología psicopatológica en las mujeres que en los hombres. Las variables sociales como edad, estado familiar, región de residencia, escolaridad, si trabajo o no, ingresos económicos, actividad laboral, están asociadas a la incidencia de psicopatología general.
Universidades salvadoreñas en la sociedad de la información
Authors: Calles Minero Camila
Published: May 2019

El mundo entero experimenta una revolución. La información y el conocimiento son la base productiva en la actualidad, por ende, la generación del conocimiento y la adecuada gestión de la información son elementales para no quedar al final de la fila entre las sociedades que avanzan. Las universidades salvadoreñas, ¿qué hacen al respecto? ¿Cómo gestionan la información? Esta investigación pretende mostrar cómo en El Salvador se gestiona la sociedad de la información y del conocimiento, vista desde las universidades, muy específicamente desde los niveles de manejo de la información para generar conocimiento en las instituciones de educación superior. Para ello se entrevistó a personeros de las universidades, a quienes preguntó sobre el flujo de información en las instituciones, y sobre el manejo de las páginas Web, entendiendo estas últimas como el medio de comunicación de la institución para mostrar su quehacer y el contacto con sus usuarios. La investigación contempló, además, el análisis de las páginas Web, con la herramienta T incluye, la cual analiza el uso de sintagmas no incluyentes, es decir, aquellos en donde las mujeres quedan invisibilidades. Se indagó sobre la presencia de políticas institucionales sobre la equidad de género y las iniciativas que existen dentro de las instituciones de educación superior sobre el uso de lenguaje inclusivo en el flujo de datos que en ellas se produce, así como en la divulgación de los mismos.
Análisis sobre el potencial y las oportunidades de comercio, inversión y de asociaciones estratégicas entre Centroamérica, la República Dominicana y la comunidad de países del Caribe (CARICOM)
Authors: García Prieto Lemus José Roberto
Published: May 2019

En octubre de 2011 la Organización de los Estados Americanos y la Fundación Global de Democracia y Desarrollo (FUNGLODE) organizaron un foro sobre “Perspectivas Económicas y Desafíos para Centroamérica y el Caribe en la Economía Global”, en Santo Domingo, la República Dominicana, en el que el Presidente Leonel Fernández y el Secretario General Adjunto de la OEA, Albert Ramdin, solicitaron el apoyo de la Comisión Económica para América Latina y el Caribe (CEPAL) para llevar a cabo un estudio acerca del potencial y los desafíos para el comercio y la inversión entre los países centroamericanos y los caribeños.
Employee’s Perception on Workplace Gossip in the South African Public Sectors: The Implication on Job Performance
Authors: Irvine Dlamini Phakamani , Blessing Mdletshe Bonga
Published: May 2019

Gossip is pervasive in any working environment. Sketching upon the existing and scant body of research knowledge surrounding the subject of gossip, the current qualitative study undertaken critically assessed how the employees protrude themselves after being victims of gossip in a workplace. This study examined the influence of workplace gossip on the job performance of employees within selected municipalities in South Africa. The researcher intended to establish the likeliest behaviour of municipality employees towards their job performance in the event of encountering workplace gossip. Interviews with twenty-five office workers were conducted and data documented and analyzed. The heuristic of this study was to equip managers or those in practice with an in-depth understanding about office gossip, by providing a new dimension about the influence workplace gossip on job performance and employees self-efficacy. Moreover, the study necessitated an in-depth understanding of several reactions that emanates from employees behavioral patterns when affected by office gossip. The study uncovered a substantial outcome, such that if gossip is work-related, rather than non-work-related, employees are more likely to improve their performance. However, unremittingly exposure to gossip can have a negative impact on employee’s self-efficacy.
The Planning for the Auditing Process in the Jordanian Commercial Banks from Perspective of the External Auditors
Authors: Al-Bawab Atef Aqeel
Published: May 2019

The study aimed to identify on the planning for the auditing process in the Jordanian Commercial Banks from perspective the external auditors. The researcher followed the descriptive and analytical approach to collect the data, and the researcher used the questionnaire to know the opinions of the external auditors about the idea of the study. The descriptive measures, such as the arithmetic mean, also the (T-test) were used to test the hypothesis of the study. The most important results of the study was there is planning for the audit process in the Jordanian commercial banks and the external auditor examines all aspects of the Bank's activities and banking products which provide to the clients. As recommended by the study by the need to develop an audit plan that is consistent with audit standards and audit profession in the commercial banks of Jordan and The need to expand the work of questionnaires that examine the internal control systems in the banks.
The Use of Reading Strategies Amongst Saudi University EFL Students
Authors: Altalhab Sultan
Published: May 2019

This study examined the use of reading strategies amongst Saudi EFL university students, exploring which strategies are perceived to be the most frequently used. Additionally, this study also aimed to explore gender differences in Saudi EFL university students’ adoption of reading strategies. The total number of the participants in this study was 148 students (75 male, 73 female) and they completed a questionnaire on the use of reading strategies. The results revealed that Saudi EFL university students were aware of most types of reading strategies. No significant differences were found between male and female students in the use of reading strategies. A noteworthy finding was that most of the students were likely to spend limited time, only 15 minutes or less a day reading English texts.
Study of three valves command laws of the expansion cylinder of a hot air engine
Authors: STOUFFS Pascal , NDAMÉ NGANGUÉ Max , SOSSO MAYİ Olivier
Published: May 2019

The family of hot
air engines with external heat
input
is divided in two subgroups: the Stirling engines, invented in 1816, have no
valves whereas Ericsson engines, invented in 1833, have valves in order to
isolate the cylinders. The
valves give some advantages to the Ericsson engine. Amongst them, the most important
one is that the heat exchangers are not to be considered as unswept dead
volumes whereas the Stirling engine designer is faced to the difficult
compromise between heat exchanger transfer area maximization and heat exchanger
volume minimization.

However, the distribution system of the
Ericsson engine introduces some complexity and a non-negligible mechanical
energy consumption in order to actuate them.

An original and very simple system called
"bash-valve" is proposed to provide answers to the difficulties
related to the distribution system of the Ericsson engine. The
"bash-valve" technology has been used in steam piston engines and
pneumatic piston engines. In this system, the piston itself actuates the
opening of the valves when being around the top dead center. When its moves to
the bottom dead center, the piston loses contact with the valves and it closes
under the effect of the return spring. Three different valves command laws of
the expansion cylinder of the proposed hot air engine are studied. A comparison
between energy performance of the engine with the expansion cylinder equipped
with two kinds of bash valve technology and the energy performance of the
expansion cylinder of an incomplete expansion Joule Ericsson cycle engine is presented as well as their influence on
the design of the system.
Temperature and stress distribution in a non-simple elastic elliptical plate due to point impulsive heat sources
Authors: VARGHESE Vinod , BHAD Pravin , MAHAKALKAR Ashwini
Published: May 2019

The paper attempts to
determine the thermoelastic stresses in a thin elliptical plate made up of non-simple elastic material subjected to point
impulsive time-dependent source of heat moving with constant velocity over the
specified finite portion. The temperature
field in the plate has been considered when the sectional heat supply is
continuously distributed along the circumference of an ellipse over the upper face with zero temperature on the lower
face, and thermally insulated curved
edge. The solution is formulated
involving the Mathieu and modified functions by employing the Laplace transform
technique. The analytical solution for the thermal stress components is
obtained using Airy’s stress function with mechanical boundary conditions as stress-free.
Numerical results are also obtained.
Closed form integration of the rotating plane pendulum nonlinear equation
Authors: Scarpello Giovanni Mingari , Ritelli Daniele
Published: May 2019

The article deals with the nonlinear differential equation of the frictionless motion of a heavy pendulum swinging in a vertical plane which rotates at a fixed angular speed. The authors focused on its closed form integration by means of the Jacobi elliptic functions. This research took its origin by an autonomous work of the authors; this subject was also developed by [3], who did a treatment by far different from ours.
A refinement of Holder's integral inequality
Authors: Liu Zheng
Published: May 2019

The purpose of this note is to show that there is monotonic continuous function $ p(t)$ such that$$ \int_a^b \left(\prod_{i=1}^n f_i(x)\right) dx\le p(t)\le \prod_{i=1}^n  \left(\int_a^b f_i^{r_i}(x)dx \right)^{1\over r_i},$$where $ f_1$, $ f_2,\ldots,f_n$ are real positive continuous functions on $ [a,b]$ and $ r_1$, $ r_2,\ldots,r_n$ are real positive numbers with $ \sum_{i=1}^n {1\over r_i}=1$.
Sheffer polynomials and approximation operators
Authors: Popa Emil C.
Published: May 2019

In this paper we are studying the sequence of linear positive operators $(P_n^{(Q,S)})$ defined in (2). Using the Bohman-Korovkin uniform convergence criterion we are proving that the sequence $(P_n^{(Q,S)})$ converges uniformly to the identity operator.

noindent In addition we give some estimates. Finally we consider two examples $(P_n^{(A,S)})$ and $(P_n^{(na,S)})$ defined in (25), (27).
Two dimensional thermo-elastic waves due to disturbance produced by an impulsive heat nucleus
Authors: Datta Biswajit , Das B.
Published: May 2019

This paper deals with a two-dimensional dynamical problem of thermoelasticity generating elastic waves due to disturbance produce by a periodic heat nucleus. Initially, a detailed discussion on the theoretical part of the problem$^{[2]}$ is made without temperature, then the disturbance due to impulsive heat nucleus is considered.
The KKM maps and fixed point theorems in convex spaces
Authors: Sy Polly W. , Park Sehie
Published: May 2019

From a general form of the celebrated Knaster--Kuratowski--Mazurkiewicz (simply, KKM) theorem, we deduce a new form of the Fan--Browder fixed point theorem, an approximate fixed point theorem, and the Himmelberg fixed point theorem.
Further properties of some mappings associated with Hermite-Hadamard inequalities
Authors: Dragomir S. S.
Published: May 2019

New properties of some functionals associated to the Hermite-Hadamard integral inequality for convex functions are given.
On new generalizations of Hilbert-Pachpatte type integral inequalities
Authors: Zhongxue Lu
Published: May 2019

In this paper, some new generalizations of Hilbert-Pachpatte type inequalities are given by introducing some parameters $ r_i,i\in\{1,2,\ldots,n\}$.
Statistically convergent double sequences
Authors: Tripathy Binod Chandra
Published: May 2019

In this aricle we introduce the notion of density of subsets of $ N \times N $. Using this concept we introduce the notion of statistically convergent double sequences and statistically Cauchy double sequences. The decomposition theorem is proved. The inclusion relations are obtained. We have shown that the bounded statistically convergent in Pringsheim's sense sequence space is not separable. A relation between strongly $ p $-Cesaro summability of double sequences and bounded statistically convergent double sequences is established.
New integral inequalities for differentiable functions
Authors: Pachpatte B. G.
Published: May 2019

The object of this paper is to establish new integral inequalities involving two functions and their derivatives. Our results in the special cases yield some well known inequalities in the literature and also other new inequalities.
Convergent and divergent solutions of a discrete nonautonomous Lotka-Volterra model
Authors: Liao Xin-yuan , Cheng Sui Sun
Published: May 2019

In this paper, a discrete nonautonomous $m$-species Lotka-Volterra system is investigated. By using fixed point theorems, a set of simple and easily verifiable conditions are given for the existence of convergent or divergent positive solutions.
Estimation of derivatives for regular positive real part functions
Authors: Yuan Wenfa , Chen Dongli , Kang Huiguang
Published: May 2019

In this paper, we mainly discuss the problem of estimating the $n$th derivative of regular positive real part functions: $ g(z)=c_0+c_1z+\cdots+c_nz^n+\cdots $, which is regular in $ |z|0 $. With the principle of inductive method and the characters of regular positive real part functions, the estimation of the $n$th derivative for the function $ g(z) $ is presented. The derivative estimation for positive functions with real part has been solved completely.
Generalization of an inequality of Alzer for negative powers
Authors: Chen Chao-Ping , Qi Feng
Published: May 2019

Let $ \{a_n \}_{n=1}^{\infty} $ be a positive, strictly increasing, and logarithmically concave sequence satisfying $ (a_{n+1}/a_{n})^{n}
A strengthened Schwarz-pick inequality for derivatives of the hyperbolic metric
Authors: Yuan Wenfa , Chen Dongli , Wang Pingan
Published: May 2019

This paper is to investigate the Schwarz-Pick inequality for the hyperbolic derivative. Our result is not only a contraction but also a contraction minus a positive constant and this improves Beardon's theorem greatly.
Applications of Ostrowski's version of the Gr"{u}ss inequality for trapezoid type rules
Authors: Barnett N. S. , Dragomir S.S.
Published: May 2019

Some applications of the Ostrowski inequality and a perturbed version of it for integral inequalities of the trapezoid type are given.
Nonlocal Cauchy problem for time varying delay integrodifferential equations of Sobolev type in Banach spaces
Authors: Balachandran K. , Ravikumar R.
Published: May 2019

In this paper we prove the existence of mild and strong solutions of nonlinear time varying delay integrodifferential equations of Sobolev type with nonlocal conditions in Banach spaces. The results are obtained by using the theory of compact semigroups and Schaefer's fixed point theorem.
Ophiocordyceps stylophora (Ophiocordycipitaceae) in Poland: new localities and host species
Authors: Chachuła Piotr , Vončina Grzegorz , Stanczak Piotr
Published: May 2019

Ophiocordyceps stylophora, a rare fungus species in Europe, was first recorded in one locality in Poland in 2011. This paper concerns 33 specimens found between 2011 and 2015 in 23 new localities in five areas. Amongst the described specimens, one was found on the Tenebrionidae beetle, and others grew on Elateridae larvae. For the first time, Tenebrionidae larvae have been observed as hosts of O. stylophora. Five new positions have been located in the southern part of Poland in the area of Oszast and Reberce nature reserves, Babia Góra and Roztocze national parks, and one has been found in the northern part of Poland, in the Elbląg Upland Landscape Park.
Hammer mechanism instruments and their role in shaping the composition style of pieces written for keyboard instruments in the period of 1730-1780, part 2 – The making of stringed keyboard instruments in the 18th century
Authors: Owczarek-Ciszewska Joanna
Published: May 2019

The article is the continuation of the cycle of texts devoted to hammer mechanism instruments from the 18th century, which was initiated in the previous issue of the magazine “Notes Muzyczny”. This instalment presents an overview of the phenomena related to keyboard instrument making in the described period – classification of instruments in terms of terminology, structure and sound (cf. classification of instruments in table 1). A general tendency of the development of keyboard instruments in the 18th century seems to be the search for original construction-related solutions of individual instrument makers, assuming, however, that there was a paramount pursuit of expanding expressive capacities. A greater diversification of sound was an answer to the changing musical language of the galant and Empfindsamkeit styles, which were aimed at touching audiences, referring to their sensitivity and not just their intellect. Subsequent subchapters present a review of the most important inventions of that vivid period. A special emphasis was placed on new forms of instruments, some of which only became part of history as experiments – unfinished projects or singular copies – whereas others functioned in the musical life of the 18th century for a longer time. The described instruments are, respectively: Hebenstreit’s pantalon, French hammer mechanism projects by Jean Marius, tangent pianos, instruments for home use – table pianos and other miniature forms, and also the development of the Vienna-type mechanism as presented by the instrument maker Andreas Stein, and hybrid instruments combining different types of mechanisms in one body.
Hammer mechanism instruments and their role in shaping the composition style of pieces written for keyboard instruments in the period of 1730-1780, part 1
Authors: Owczarek-Ciszewska Joanna
Published: May 2019

The article constitutes the first part of a cycle devoted to keyboard instruments with hammer mechanism made between 1730 and 1780. The author’s intention is presenting a wide perspective of selected topics on keyboard instrument making in the 18th century and the influence of how instruments were made on music practice at that time. The aim seems justified due to scarce publications on this subject available in Polish, among other reasons. The first chapter briefly outlines general aspects of the 18th century music culture which was the background of the development of instrument making. As far as the theory of aesthetics was concerned, despite the predominance of vocal and instrumental music which used lyrics and their meaning, it was the period when rapid development of purely instrumental genres such as symphony or instrumental concerto took place. Also the popularisation of public and concert life, as well as home music-making gave an impulse for the development of instrument making. The second chapter touches on the invention of Bartolomeo Cristofori, its earlier reception and the role of Domenico Scarlatti in the popularisation of that instrument. Attempts to construct a keyboard instrument with a mechanism making the strings vibrate by striking them date back to the 15th century. However, the turning point in the history of all family of string keyboard instruments was only when in 1698 Cristoforti constructed a technically advanced hammer action mechanism, with enabled nuancing piano e forte dynamics on the traditional cembalo. Probably, among first promoters of the new instrument was Scarlatti and it was through him that grand pianos appeared on Portuguese and Spanish courts. Despite certain stylistic features proving that he was inspired by the capacities of the new instrument, there is no explicit evidence that Scarlatti’s Sonatas were meant for the piano. Nevertheless, the name pianoforte (piano e forte) does appear on title pages of works written by two other composers of that time, i.e., Lodovico Giustini and Sebastián de Albero, and their pieces have been briefly analysed at the end of the article.
A Concept of Live Fire Testing to Identify the Aerodynamic Factors of a 35-mm AA Projectile
Authors: BARANOWSKI Leszek , GADOMSKI Błażej , MAJEWSKI Przemysław , SZYMONIK Jacek
Published: May 2019

This paper presents a generic algorithm designed to identify aerodynamic factors among the data specified in firing tables and projectile flight parameter data recorded during live fire tests. The algorithm and the concept of live fire testing shown here allow developing a mathematical model of projectile trajectory in the form of a modified motion model of a point mass. Potential applications of the model include fire control systems.
Das liberale Paradigma auf dem Prüfstand: Friedensforschung und Sicherheitspolitik an den Bruchstellen der Globalisierung
Authors: Brzoska Michael , Heller Regina , Kahl Martin , Kreikemeyer Anna
Published: May 2019

At the end of the 20th century, a lasting peace based on liberal ideas seemed within reach. Today, the liberal world view is in a deep crisis, closely linked to effects of globalization. How can we conceptualize this crisis and its consequences for the liberal paradigm in peace research and peace-oriented security policy? The article begins with a theoretical classification of central ideas of liberal peace theory in the context of globalization, before empirically examining liberally inspired security policy concepts and practices at selected fault lines of globalization: It concludes with a vote in favor of the liberal idea, which, however, in view of the complex changes induced by globalization, local resistance, and pathologies in the security practices of Western states, needs to re-calibrate its positioning towards itself and the world around it.
Solidarität und Skepsis - Flucht, Migration und soziale Frage aus der Sicht gewerkschaftlich Engagierter
Authors: Brinkmann Ulrich , Hassan-Beik Maren , Zappino Lukas
Published: May 2019

Der Beitrag untersucht das Verhältnis von Gewerkschaften und Rechtspopulismus anhand einer bisher wenig erforschten Untersuchungsgruppe gewerkschaftlich Engagierter, die, so die These, zwischen Struktur und Belegschaft agieren und in diesem Sinne eine spezifische Scharnierfunktion ausüben. Die Studie ist explorativ ausgelegt und verbindet qualitative und quantitative Erhebungsmethoden. Trotz sich deutlich abzeichnender Prekarisierungsprozesse und Verunsicherung sowie einer infolgedessen erodierenden Vertrauensbasis in die Politik lässt sich eine ungebrochene (oder neu entflammte) Konfliktorientierung ausmachen. Die Gewerkschaften fungieren dabei zunehmend als Hoffnungsträger im Kampf gegen arbeitsweltliche Zumutungen und soziale Deklassierung. Die Erhebung fördert auch ethnisierende Konfliktverschiebungen und Vorbehalte gegen Geflüchtete zutage, für die drei Deutungslinien zusammengeführt werden. Das Sample insgesamt ist jedoch heterogen, was eine vertiefende Clusteranalyse verdeutlicht, bei der sich drei Gruppen mit jeweils unterschiedlichen Gesellschaftsbildern ausdifferenzieren lassen.
RESEÑA de: Ascensión Elvira Perales. Libertad de circulación de personas en la Unión Europea. CEPC, Madrid, 2017
Authors: Gilbaja Cabrero Estela
Published: May 2019

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Noticias de libros
Authors: - -
Published: May 2019

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Tartaruga-da-Amazônia e Tracajá: uma revisão bibliográfica acerca do parasitismo e das relações socioambientais
Authors: Carvalho Aluísio Vasconcelos , Vasconcelos Larissa Leonilda Pereira Melo , Lopes Thays Kelly Marinho , Malvasio Adriana
Published: May 2019

A Tartaruga da Amazônia (Podocnemis expansa) e o Tracajá (Podocnemis unifilis) são quelônios de grande importância cultural, ambiental e econômica. Em alguns assentamentos e comunidades ribeirinhas, esses répteis são tidos como fonte de alimento. Sendo assim esse trabalho analisa, de acordo com outras fontes bibliográficas, a relação de parasitas com esses quelônios, tendo em vista a saúde desses animais. Conforme alguns trabalhos publicados, existem alguns endoparasitos e ectoparasitos que podem ser encontrados nesses répteis, sendo alguns causadores de doenças que debilitam esses animais, podendo inclusive levar ao óbito. Além das possíveis doenças que tem acometido os quelônios através do parasitismo, esses animais tem o seu habitat cada vez mais antropizado e têm sido alvo de caça e exploração ilegais. Tais fatores colocam em risco a sobrevivência das espécies, desencadeando um desequilíbrio ambiental em cadeia.
Indhold
Authors: Poetik Redaktionen
Published: May 2019

Indhold
Forord
Authors: Poetik Redaktionen
Published: May 2019

Forord
Bestillingsseddel og Poetiks bibliotek
Authors: Poetik Redaktionen
Published: May 2019

Bestillingsseddel og Poetiks bibliotek
Grunnlaget for en litteratursosiologi
Authors: Iversen Irene
Published: May 2019

Grunnlaget for en litteratursosiologi
Maalsætningsdebat
Authors: Poetik Redaktionen
Published: May 2019

Vedr. forholdet mellem universitet og samfund
Literaritet
Authors: Kock Christian
Published: May 2019

Literaritet
Tillæg I & II
Authors: Poetik Redaktionen
Published: May 2019

I. Handlingens kronologi i "Hosekræmmeren"II. Tekstmængdens fordeling på Morten Vinges leveår i "En landsbydegns dagbog"
Om logik, semantik og litteraturvidenskab
Authors: Jensen Hans Siggaard
Published: May 2019

Om logik, semantik og litteraturvidenskab
Handlingsbeskrivelse på grundlag af den dynamiske psykologi
Authors: Walther Jens
Published: May 2019

Handlingsbeskrivelse på grundlag af den dynamiske psykologi
Poetik har hidtil (1967-1970) bragt følgende artikler
Authors: Poetik Redaktionen
Published: May 2019

Serie I og serie II
Kommentar til Jørgen Egebak: "Historisme" og "strukturalisme"
Authors: Rømhild Lars Peter
Published: May 2019

Kommentar til Jørgen Egebak: "Historisme" og "strukturalisme"
Munksgaard - litteratur om litteratur
Authors: Poetik Redaktionen
Published: May 2019

Et kritisk øje
Om Samuel Becketts Textes Pour Rien, IV.
Authors: Toft Jens
Published: May 2019

Om Samuel Becketts Textes Pour Rien, IV.
Barthes og den semiologiske model
Authors: Brandt Per Aage
Published: May 2019

Barthes og den semiologiske model
Klassekampens fysiologi i Les Rougonmacquart
Authors: Nielsen Jens Peter Lund
Published: May 2019

Klassekampens fysiologi i Les Rougonmacquart
Bemærkninger til en textteori
Authors: Kock Christian
Published: May 2019

Forsøg i retning af flere kriterier for textbeskrivelse
Flaubert i skriften
Authors: Pedersen Jørgen Mønster , Brandt Per Aage
Published: May 2019

En grammatologisk analyse af Trois Contes
Marxisme og strukturalisme
Authors: Pittelkow Ralf
Published: May 2019

En introduktion til Lucien Sebag
Den "forsvundne" produktivitet
Authors: Holmgaard Jørgen
Published: May 2019

En analyse af J. P. Jacobsens 'Niels Lyhne'