bluuebunny/crossref_metadata_2025 huggingface dataset:
Aporte de calor por cristalización fraccionada en dos campos geotérmicos del Cinturón Volcánico Mexicano
Authors: Andaverde Jorge , Verma Surendra P. , Schildknecht Friedrich
Published: May 2021

En este trabajo se presenta la metodología para el cálculo del aporte de calor por el proceso de cristalización fraccionada en cámaras magmáticas y se le aplica en los campos geotérmicos de Los Azufres, Mich. Y Los Humeros, Pue. La cantidad de calor generada por cristalización fraccionada y aportada al medio resulta ser mayor que la calculada al considerarse que la cámara se enfría en un solo paso, encontrándose que el aumento en temperatura es de â‰ˆ411 °C para Los Azufres y de â‰ˆ472 °C para Los Humeros y no de â‰ˆ300 °C como fue antes considerada. Los resultados de este trabajo se incluirán en las pruebas posteriores de modelación térmica en ambos campos geotérmicos.
Características del manantial "Las Estacas" en Morelos, México
Authors: Niedzielski Henryk
Published: May 2021

El manantial Las Estacas, de primer orden, se manifiesta con un caudal constante, caracterizado por el índice de variación 1.52. El manantial brota en el valle del rio Yautepec, a lo largo de 600 m de calizas cretácicas de forma descendiente; sin embargo, el principal surgimiento es ascendente de una gruta Kárstica. Basándose en las condiciones geológicas e hidrogeológicas de la zona en algunas propiedades físico-químicas del agua se supone que el manantial constituye un desagüe de los acuíferos de la subcuenta del rio Cuautla a través de un conducto Kárstico subterráneo, o un sistema de conductos, de longitud de 13 km aproximadamente, que aprovecha el flujo subterráneo cruzando las dos cuencas hidrográficas.
Influencia del efecto gravitacional del relieve topográfico sobre las anomalías de Bouguer hasta la zona de Hayford O2 en Cuba oriental
Authors: Cuevas Ojeda Jose L. , Puchades Maritza Pacheco
Published: May 2021

Un estudio de la influencia del efecto gravitacional del relieve topográfico sobre las anomalías de Bouguer hasta la zona de Hayford 02 (eg. 166.7 km) en la región de Cuba oriental ha sido realizado. Es precisamente en esta región de Cuba donde se obÂ­servan los mayores desniveles de alturas, que corresponden entre la Sierra Maestra y la Hoya de los Caimanes; estos valores alÂ­canzan magnitudes máximas por encima de 8 000 m. El cálculo del efecto gravitacional provocado por la topografía se realizó asumiendo una densidad de 2,67 t/m3, utilizándose un conjunto de radios de integración parcial de 5 y 10 km hasta la distancia antes mencionada, en tres zonas montañosas y en otra zona con carácter de llanura. Al realizarse el estudio de integración parcial del efecto gravitacional se pudo establecer que el comportamiento del decrecimiento con la distancia se ve influenciado por los desniveles adyacentes con un aumento del mismo. Se pudo establecer que para toda esta región la corrección topográfica alcanza valores máximos de hasta 70 mGal (Sierra Maestra), en las Sierras de Nipe-Cristal toman valores de hasta 11 mGal y Purial toma valores de hasta 18 mGal, discutiéndose las causas de las diferencias existentes. Se demuestra con ejemplos reales que en esta reÂ­gión la influencia del efecto gravitacional del relieve sobre las anomalías de Bouguer es significativa y que de hecho se introduÂ­cen errores al no considerar este efecto. PALABRAS CLAVE: Efecto gravitacional, correccción topográfica, anomalías de Bouguer.
Fuente de calor en el campo geotérmico de Cerro Prieto y su relación con la anomalía magnética Nuevo León, México
Authors: Quintanilla M. Ana Luz , Suárez V. Francisco
Published: May 2021

El sistema geotérmico de Cerro Prieto ubicado dentro de la provincia de la Depresión del Salton es uno de los sistemas hidrotermales activos localizados en la parte norte, dentro de la zona de transición en la frontera de placas marcada por el sistema de Falla San Andrés-Dorsal del Pacífico Este. Diversos modelos se han desarrollado mediante los cuales se pretende explicar los procesos tectónicos responsables del desarrollo del ambiente geotérmico en el área de Cerro Prieto. Dentro de estos modelos está el propuesto por Goldstein et al., (1984), quienes empleando datos magnéticos y algunos resultados de análisis petrográficos, proponen que la llamada anomalía magnética Nuevo León sea generada por un cuerpo prismático de composición gabroica-peridotítica localizado a 3.8 Km de profundidad. Utilizando información magnética e incorporando nuevos resultados petrológicos obtenidos de muestras de roca recuperadas durante la perforación de pozos recientes, se propone un modelo que modifica el de Goldstein et al. (1984). Como resultado del presente estudio se propone que la anomalía magnética Nuevo León podría ser generada por dos cuerpos cuyas dimensiones y profundidades son diferentes. El más somero de éstos tiene su cima localizada a 4.5 Km de profundidad y su base está a 7 Km. Este está ligeramente inclinado hacia el norte. En el segundo cuerpo la sima está localizada a 5 Km y su base a 8 Km. Ambos cuerpos son de composición gabroica. Considerando lo anterior, así como el gradiente térmico calculado, se obtiene que la zona de fusión se localiza a 11 Km de profundiad y no a los 7-7.5 Km. La presencia de los cuerpos plutónicos a profundidad son considerados como parte de la fuente térmica en el área.
Morphological characteristics of ionospheric E layer over El Cerrillo station, Mexico during magnetically quiet conditions.
Authors: Araujo Pradere E. A. , Lois Menéndez L. , Durand Manterola: H. J.
Published: May 2021

Se describe la región E de la ionosfera observada en la estación ionosférica de El Cerrillo, México bajo condiciones magneto tranquilas y para diferentes niveles de actividad solar. Se obtiene que su comportamiento es típico de una región en equilibrio fotoquímico y puede ser bien descrita a partir de la Teoría de Capa Simple de Chapman. Si se elimina la suposición de atmósfera isotérmica y se consideran gradientes de escala de altura constantes dH/dhâ‰ˆ0.2, los valores del exponente N, encontrados por regresión lineal entre la frecuencia crítica y el ángulo cenital del Sol, son muy semejantes a los predichos por la teoría de Chapman. Sus máximos valores de frecuencia (concentración) se encuentran un poco después del mediodía local y dependen fuertemente del nivel de actividad solar. Bajo condiciones diurnas, foE se incrementa entre 7 y 10 veces, teniendo la máxima razón durante periodos de Baja Actividad Solar. Se observa una clara tendencia de incremento de foE con la actividad solar.
Comentarios sobre "Campo de gravedad de la fosa tectónica del sur de Colima" por W. L. Bandy, C. A. Mortera-Gutiérrez y J. Urrutia Fucugauchi
Authors: García Abdeslem Juan
Published: May 2021

"SIN RESUMEN"
Respuesta a los comentarios de J. García Abdeslem sobre: "Campo de gravedad de la fosa tectónica del sur de Colima"
Authors: Bandy William L. , Mortera Gutierrez C. , Urrutia Fucugauchi J.
Published: May 2021

"SIN RESUMEN"
Surface distortion decomposition for vector controlled source audio-magnetotelluric data
Authors: A. Arzate Jorge , C. Bailey Richard
Published: May 2021

Los datos audiomagnetotelúricos de fuente controlada (CSAMT) utilizando un solo dipolo eléctrico, también conocidos como datos CSAMT vectoriales, son procesados normalmente usando un modelo de inducción bidimensional el cual no incorpora efectos por distorsión galvánica. El número limitado de datos disponibles en CSAMT vectorial no permite modelos que incluyan simultáneamente efectos de inducción 2-D y distorsión galvánica local. En este artículo proponemos dos modelos unidimensionales de distorsión, los cuales son casos especiales del método genera de descomposición tensorial MT de Groom y Bailey (1989). Uno de estos asume que el parámetro de distorsión llamado splitting (s) puede hacerse cero escogiendo un sistema coordenado apropiado. El otro, desarrollado en términos de elipses de polarización, supone que el parámetro de distorsión shear (e) puede hacerse cero rotando los ejes principales a los ejes de medición. El primero de los modelos genera la resistividad, la fase y los parámetros twist (t) y shear, mientras que el segundo genera la resistividad, la fase y los parámetros twist y splitting.
A Medium-sized Seismograph Network in a Challenging Enviroment
Authors: L. Lynch Lloyd , B. Ambeh W. , A. Robertson R. E. , L. Latchman J. , Bridgemohan M.
Published: May 2021

Se describe la operación de las redes sísmicas de 30 estaciones que cubre las islas del Caribe Oriental, con centro en la Universidad de West Indies en Trinidad. La red incluye la vigilancia de 15 volcanes activos en un arco de 750 km de largo. La red tiene capacidad para detectar y localizar la mayoría de eventos de M>2 en la región. Se describe la evolución de la red y algunas de sus estrategias de superación.
The propagation of Love and Rayleigh waves in the Andean Region
Authors: A. Drake Lawrence , Minaya Ramos Estela
Published: May 2021

El patrón distintivo desde la fuente sísmica de un campo irradiado de ondas sísmicas se modifica profundamente al pasar por una región irregular como la Cordillera de los Andes de América del Sur. La onda Lg guiada por la corteza útil en la discriminación de fuentes sísmicas, pero, aun para una sola fuente, las amplitudes de ondas de periódo corto como Lg pueden variar significativamente. La Cordillera de los Andes de Bolivia forma una parte de la cadea de los Andes, que se originó en los dos principales ciclos orogénicos del Fanerozoico, un Ciclo Preandino Precámbrico-Paleozoico Superior y el Ciclo Andino Mesozoico-Cenozoico. Durante el último Ciclo, cuatro sistemas del arco magmático se desarrollaron sucesivamente hacie el este: un arco Jurásico-Cretácico Temprano en la Cordillera Costera de Chile, un arco Cretácico Medio en el Valle Longitudinal de Chle, un arco Cretácico Tardío-Paleogénico en la Precordillera Chilena y el arco Mioceno-Holoceno en la Cordillera Occidental (Omarini et al., 1991; Dorbath et al., 1993; Scheuber et al., 1994). En la región del Cabalgamiento Andino Principal entre la Cordillera Oriental (o Real) y las Sierras Subandinas en Bolivia septentrional, hay superposición de aproximadamente 230 km de edad Neogena (Roeder, 1988). Las areniscas cloríticas Permicas marinas cerca de Copacabana sobre el Lago Titicaa y las diamicititas, areniscas, cuarcitas y lutitas Ordovícico.Silúricas apretadamente plegadas, expuestas abundantemente en los cortes del camino entre Cochabamba y Caracollo, se encuetran a elevaciones desde 3800 m a 4500 m sobre el nivel del mar. El sistema de fallas de la Cordillera Real, en el borde sudoccidental, marca un límite subvertical, con buzamiento al sudoeste, que separa dos unidades de velocidad contrastante hasta una profundidad de 140 km. La profundiad de Moho debajo del Altiplano fue encontrada por Dorbath et al. (1993) aproximadamente a 60 km y, debajo de la Cordillera Real, aproximadamente a 50 km. Más al sur, a través del Sur de Bolivia y Norte de la Argentina, Wigger et al. (1994) encontraton que la profundidad al Moho debajo del Altiplano es aproximadamente de 72 km y, debajo de la Cordillera Real aproximadamente a 65 km. La propagación de las ondas de Love y de Rayleigh de periódo corto, a lo largo de un perfil que atraviesa estas unidades del Altiplano y de la Cordillera Real de Bolivia septentrional, ha sido analizada por el método de elementos finitos. Un resultado preliminar es que, sin tener en cuenta la absorción, a un periódo de 2 s, 91.69% de la energía del modo fundamental de la onda Love y 98.60% de la energía del modo fundamental de la onda Rayleigh son transmitidos.
Estimates of the site effects in Oaxaca, Mexico using horizontal to vertical spectral ratios
Authors: Castro Raúl R.
Published: May 2021

Comparamos estimaciones de la respuesta sísmica de sitio en Oaxaca, México determinadas mediante el uso de métodos espectrales que no dependen de un sitio específico de referencia. En particular, usamos cocientes espectrales entre los componentes horizontal y vertical de las ondas S (e.g. Lermo y Chávez-García, 1992) para estimar la respuesta sísmica de sitios localizados en suelo duro y sobre sedimentos. Comparamos los resultados obtenidos con las funciones de sitio determinadas por castro y otros (1995) usando una investigación generalizada. Aunque ninguno de los dos métodos depende de un sitio de referencia común, ambos métodos generan funciones de sitio similares en forma. Para sitios localizados en roca dura, los factores de amplificación obtenidos son además consistentes. Sin embargo, existe una discrepancia de escala para el sitio localizado sobre sedimentos, la cual puede deberse en parte a la condición de sitio impuesta en el esquema de inversión.
Studi Pembuatan Edible Film Gel Okra (Abelmoschus esculentus L.) dengan Penambahan Pati Singkong
Authors: Muslimah Siti Mukaromatul , Warkoyo Warkoyo , Winarsih Sri
Published: May 2021

Edible film is an organic material packaging that has plastic-like properties but is biodegradable. The components of the edible film include hydrocolloids. Okra gel is a long chain hydrocoloid polysaccharide with a high molecular weight and a constituent protein containing both hydrophilic and hydrophobic substances. The hydrophilic characteristics are used to improve the physical properties of solubility. Meanwhile, hydrophobic characteristics are used to improve barrier properties (WVTR). Okra (Abelmoschus esculentus L.) is one of the cultivated plants that is currently underutilized by the community but has benefits and high nutritional content. The addition of cassava starch aims to increase the strength of the edible film. The purpose of this study was to determine the use of okra gel proportion and cassava starch concentration in making edible films which can produce edible film characteristics that meet the standards.This study used a factorial randomized block design (RBD). The first factor is the ratio of okra gel and distilled water (1: 3; 1: 1; 3: 1, 1:0). The second factor is the concentration of cassava starch (2.5% and 5% (w / v)). The parameters tested were yield of raw materials, thickness, solubility, transparency, tensile strength, elongation, WVTR (Water Vapor Transmison Rate) and SEM (Scanning Electron Microscopy).The results showed that there was no interaction between okra gel and cassava starch. However, the comparison of okra gel and distilled water had a significant effect on the transparency value with an average of 0.89-1.60 A546 / mm. The concentration of cassava starch has a significant effect on transparency 0.89-1.60 A546 / mm, tensile strength 0.97-2.33%. Edible film with the best treatment was obtained in G2P1 treatment (ratio of okra gel and distilled water (1: 1) and 2.5% cassava starch) with a thickness of 0.08mm, transparency 0.58A546 / mm, WVTR 3.87g / m2 / 24h, elongation 9.24%, tensile strength 0.74MPa and solubility 23.56%. And SEM analysis results show uneven morphology.
Determination of the kinetics of chlorobenzene nitration using a homogeneously continuous microflow
Authors: Cui Yongjin , Song Jing , Du Chencan , Deng Jian , Luo Guangsheng
Published: May 2021

The nitration of chlorobenzene with concentrated mixed acids is a fast
and highly exothermic process, which suffers from considerable mass
transfer resistance and poor heat transfer rates. The reaction kinetics
has not been thoroughly reported before. In this work, a continuous-flow
microreactor system and a homogeneous reaction condition were proposed
to obtain accurate chlorobenzene nitration kinetics data at high mixed
acid concentrations. A general model for predicting the observed
reaction rate constants was established. With a new method for
estimating the equilibria associated with HNO3 in aqueous sulfuric acid,
the rate constants based on nitronium ion and activation energies were
obtained. Compared with batch reactors, the continuous-flow microreactor
system allows for a sufficient heat transfer efficiency and accurate
residence time control, making it possible to study the reaction
performance more quickly and sensitively. This work may provide a
reliable reference for the kinetic study of similar processes.
Patterns in the Juan Fernandez fur seal faecal microbiome
Authors: Valdivieso Constanza Toro , Toro Frederick , Stubbs Samuel , Castro-Nallar Eduardo , Blacklaws Barbara
Published: May 2021

As apex predators, pinnipeds are considered to be useful bioindicators
of marine and coastal environments. Endemic to a small archipelago in
the South Pacific, the Juan Fernandez fur seal (JFFS) is one of the
less-studied members of the pinniped family Otariidae. This study aimed
to characterize the fecal microbiome of the JFFS for the first time, in
order to establish a baseline for future studies of
host-microbial-environment interactions and monitoring programs. During
two consecutive reproductive seasons, 57 fecal samples were collected
from 7 different JFFS colonies within the Juan Fernandez Archipelago,
Chile. Bacterial composition and abundance were characterized by
sequencing the V4 region of the 16S rRNA gene. The overall microbiome
composition was dominated by five phyla: Firmicutes (40 %),
Fusobacteria (30 %), Bacteroidetes (22 %), Proteobacteria (6 %) and
Actinobacteria (2 %). Alpha diversity was higher in Tierras Blancas.
However, location was not found to be a dominant driver of microbial
composition. Interestingly, the strongest signal in the data was a
negative association between the genera Peptoclostridium and
Fusobacterium, which explained 29.7 % of the total microbial
composition variability between samples. The genus Peptoclostridium has
not been reported in other pinniped studies and its role here is
unclear, with interpretation challenging due to a lack of information
regarding microbiome functionality in marine mammals. As a first insight
into the JFFS fecal microbiome, these results contribute towards our
understanding of the natural microbial diversity and composition in
free-ranging pinnipeds.
Conformational variability in proteins bound to single-stranded DNA: a new benchmark for new docking perspectives
Authors: MIAS-LUCQUIN Dominique , Beauchêne Isaure Chauvot de
Published: May 2021

We explored the Protein Data-Bank (PDB) to collect protein-ssDNA
structures and create a multi-conformational docking benchmark including
both bound and unbound protein structures. Due to ssDNA high flexibility
when not bound, no ssDNA unbound structure is included. For the 143
groups identified as bound-unbound structures of the same protein , we
studied the conformational changes in the protein induced by the ssDNA
binding. Moreover, based on several bound or unbound protein structures
in some groups, we also assessed the intrinsic conformational
variability in either bound or unbound conditions, and compared it to
the supposedly binding-induced modifications. This benchmark is, to our
knowledge, the first attempt made to peruse available structures of
protein – ssDNA interactions to such an extent, aiming to improve
computational docking tools dedicated to this kind of molecular
interactions.
Application of the Oscillation Symmetry to the Electromagnetic Interactions of Some Particles, Nuclei, and Atoms
Authors:   Universté Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay Cedex, France, Tatischeff Boris
Published: May 2021

The oscillation symmetry is first applied to electromagnetic interactions of particles and nuclei. It is shown that the differences between successive masses plotted versus their mean values and the electromagnetic decay widths Γee of 0^−(1^−−) b¯b and c¯c mesons, plotted versus their masses, agree with such symmetry. Then it is shown that the variation of the energy differences between different levels of several nuclei from 8Be to 20Ne, corresponding to given electric or magnetic transitions, display also oscillating behaviours. The electromagnetic widths of the electric and magnetic transitions between excited levels of these nuclei, plotted versus the corresponding differences between energies agree also with this property. The oscillating periods describe also an oscillation, the same for E1, M1, and E2 transitions. It is also the case for the multiplicative factor used β, and for ratios between these parameters. The oscillation symmetry is then applied to atomic energy levels of several neutral atoms from hydrogen to phosphorus. The data exhibit nice oscillations when plotted in the same way as before. The oscillations in various nuclear and atomic periods of different elements (A) exhibit the same shape and can be fitted by the same distribution.
Digital Competence of Hospitality Students within the Context of Information and Communication Technology Environment
Authors:   Latvia University of Life Sciences and Technologies, Iriste Sandra , Katane Irena ,   Latvia University of Life Sciences and Technologies
Published: May 2021

In the nearest future, most industries, including hospitality, will be characterized by significant changes linked to the change of business models, leaders break through innovations due to the new global epidemiological situation. Considering the new digitization trends in the hospitality industry, only companies with employees with high-level digital competence will be able to survive, adapt and develop. The dual study environment of a higher education institution ‒ the study environment of a higher education institution and the environment of professional activities plays a major role in the development of digital competence. On the basis of the ecological approach, there has been the context of information and communication technology environment viewed in the article within the substantiation of digital competence. The aim of the study was: during the pedagogical experiment to approbate the developed “Model of the dual study environment of a higher education institution” and to evaluate university hospitality students’ competitiveness including digital competence as competitiveness integral part. To find out how significantly has changed the self-evaluation of students’ digital competence after the prospective hospitality business managers’ competitiveness facilitation in the framework of the developed dual study environmental model. Both before and after the pedagogical experiment the students performed the self-evaluation of digital competence by using the authors’ developed and examined competitiveness evaluation methodology. The obtained results testify that the developed and approbated model for promotion of competitiveness development in general impacted self-assessments of the students' digital competence during the pedagogical experiment.
The role of adiponectin and its receptor in patients with idiopathic membranous nephropathy complicated with hyperuricemia
Authors: Liu Tong , Xia Mengdi , Zhang Yongji , Wang Yibin , Zhou Yun
Published: May 2021

Introduction/Objective. This study aimed to assess the changes of adiponectin (APN), IL-1?, adiponectin receptor 1 (Adipo R1), and NLRP3 expression of patients with idiopathic membranous nephropathy (IMN) complicated with hyperuricemia (HUA) and analyze the relationship between the APN pathway and the NLRP3 pathway. Methods. A group of 48 patients with IMN + HUA, a group of 49 patients with IMN, 30 healthy controls, and 24 samples of healthy renal tissue were evaluated. APN and IL-1? of each group were detected by the ELISA method. AdipoR1 and NLRP3 in kidney tissue were detected by immunohistochemistry. The clinical data of each group were collected, and the relationship between APN, IL-1?, AdipoR1, NLRP3, and other indexes was analyzed. Results. (1) The concentration of UA, APN, IL-1?, and NLRP3 in the IMN + HUA group were significantly higher than those in the IMN group, but the AdipoR1 was lower. (2) With the severity of chronic kidney disease stage, APN, IL-1?, and NLRP3 gradually increased in the IMN + HUA group, but AdipoR1 gradually decreased. However, the aforementioned indicators did not change significantly in the IMN stages. Conclusion. The AdipoR1?AMPK and NLRP3?caspase-1?IL-1? signaling pathway may play an essential role in IMN + HUA patients. An intervention on these two pathways may have significant impact on the disease occurrence and progression in IMN + HUA patients.
An Investigation of Nonprofit Reporting of Significant Diversions of Assets
Authors: Scheetz Andrea M. , Wilson Aaron B. , Dowis W. Brian
Published: May 2021

Archival research suggests that nonprofit organizations are inaccurately reporting significant asset diversions on IRS Form 990. This suggests that information reported on Form 990 may be misleading. This study investigates three possible causes for the underreporting of significant diversions of assets, including reading the Form 990 instructions, how the threshold for reporting is met, and the threat of outside detection of the theft. Our findings suggest that reading the instructions for Form 990, positively and significantly influences disclosure of an asset diversion. We also examine press release reporting and find that risk of detection of the theft is a significant predictor of press release disclosure. We conduct a second study to test our suggested changes to the wording of the Signature Line and Governance Section of Form 990. Adjusting the wording of the significant diversion of assets question to be more transparent results in greater disclosure.
Preterm Premature Rupture of Membranes
Authors: Castro Daniel , Norwitz Errol R.
Published: May 2021

Preterm premature rupture of membranes (PPROM) refers to rupture of the fetal membranes prior to 37-0/7 weeks’ gestation and prior to the onset of labor. PPROM complicates 2-4% of singleton pregnancies and 7-20% of twin pregnancies, and has been implicated in 30-40% of preterm births. Antepartum management involves confirming the diagnosis, excluding contraindications to expectant management (such as stillbirth, nonreassuring fetal testing, and intrauterine infection), and continued inpatient care with perinatology/NICU consultation, antenatal corticosteroids, broad-spectrum antibiotics (to prolong latency), and serial fetal surveillance. Delivery is indicated in the setting of nonreassuring fetal testing, intrauterine infection, excessive vaginal bleeding, preterm labor, and/or a gestational age of 34 weeks or beyond. Latency (time from rupture of membranes to delivery) depends on gestational age, severity of oligohydramnios, number of fetuses (shorter in twins), pregnancy complications (placental abruption, infection), fetal wellbeing, and use of broad-spectrum antibiotics. PPROM cannot be accurately predicted or prevented. Appropriate evidence-based management is essential to optimize outcome for both the mother and fetus in the setting of PPROM.
This review contains 1 table, 2 figures and 57 references.
Key words: chorioamnionitis, preterm birth, perinatal morbidity, twin pregnancies, preterm premature rupture of membranes (PPROM), fetal complications, maternal complications, labor and delivery, inpatient care, antepartum management
Does the Association Between Hemoglobin A1c and Risk of Cardiovascular Events Vary by Residential Segregation? The REasons for Geographic And Racial Differences in Stroke (REGARDS) Study
Authors: Cummings Doyle M. , Patil Shivajirao P. , Long D. Leann , Guo Boyi , Cherrington Andrea , Safford Monika M. , Judd Suzanne E. , Howard Virginia J. , Howard George , Carson April P.
Published: May 2021

OBJECTIVE

To examine if the association between higher A1C and risk of cardiovascular disease (CVD) among adults with and without diabetes is modified by racial residential segregation.

RESEARCH DESIGN AND METHODS

The study used a case-cohort design, which included a random sample of 2,136 participants at baseline and 1,248 participants with incident CVD (i.e., stroke, coronary heart disease [CHD], and fatal CHD during 7-year follow-up) selected from 30,239 REasons for Geographic And Racial Differences in Stroke (REGARDS) study participants originally assessed between 2003 and 2007. The relationship of A1C with incident CVD, stratified by baseline diabetes status, was assessed using Cox proportional hazards models adjusting for demographics, CVD risk factors, and socioeconomic status. Effect modification by census tract-level residential segregation indices (dissimilarity, interaction, and isolation) was assessed using interaction terms.

RESULTS

The mean age of participants in the random sample was 64.2 years, with 44% African American, 59% female, and 19% with diabetes. In multivariable models, A1C was not associated with CVD risk among those without diabetes (hazard ratio [HR] per 1% [11 mmol/mol] increase, 0.94 [95% CI 0.76–1.16]). However, A1C was associated with an increased risk of CVD (HR per 1% increase, 1.23 [95% CI 1.08–1.40]) among those with diabetes. This A1C-CVD association was modified by the dissimilarity (P < 0.001) and interaction (P = 0.001) indices. The risk of CVD was increased at A1C levels between 7 and 9% (53–75 mmol/mol) for those in areas with higher residential segregation (i.e., lower interaction index). In race-stratified analyses, there was a more pronounced modifying effect of residential segregation among African American participants with diabetes.

CONCLUSIONS

Higher A1C was associated with increased CVD risk among individuals with diabetes, and this relationship was more pronounced at higher levels of residential segregation among African American adults. Additional research on how structural determinants like segregation may modify health effects is needed.
Scenkonst eller gatuteater? Lärares arbete i relation till struktur, organisering och yrkesgränsernas utsträckning
Authors: Gardesten Jens , Nordänger Ulla Karin , Herrlin Katarina
Published: May 2021

The study highlights the extension and scope of teachers’ work. Swedish teachers reflected on this before and after visiting schools in France, where “CPE-staff” alleviate teachers with different tasks. In sum, findings indicate that the extension and scope of teachers’ work can be discussed in terms of what, when and where, but also as already institutionalized or something that reshapes during negotiations on a daily basis. The findings are analyzed by the concepts of “structure” and “communitas” (Turner, 1974, 2008), highlighting how the professional boarders are dependent on patterns of structures and relationships within the school as an organization.
I skuggan av kulturellt kapital – om konsten att omforma habitus för skolframgång
Authors: Månsson Niclas , Carlhed Ydhag Carina , Osman Ali
Published: May 2021

This article focuses on how high-achieving Swedish upper secondary students from families with low educational capital manage to transform their cultural capital and habitus to embark on a successful educational career. The analytical framework of the study is based on Bourdieu’s understanding of cultural capital and habitus. The data analyzed are based on interviews with 23 upper secondary students. Their success is based on a combination of a caring home environment and seeing both trustfully teachers, and like-minded peers as resources for their educational success, together with an awareness that good grades equal desirable position on the labour market.
Correlación entre ph salival y caries dental en pacientes con síndrome de Down que acuden a la Fundación asistencial Armada Nacional-Guayaquil-Ecuador
Authors: Contero Mejía Paola Estafania , Cabrera Dávila María José
Published: May 2021

Objetivo: determinar la correlación entre pH salival y caries dental en pacientes con Síndrome de Down que acuden a la Fundación Asistencial Armada Nacional (FASAN)-Guayaquil. Metodología: esta investigación se llevó a cabo en pacientes con Síndrome de Down por una muestra de 58 individuos entre las edades de 4 a 25 años de ambos géneros. Se realizó la medición del pH salival a través de tiras indicadoras de pH colocadas sublingualmente, para generar diagnósticos de caries dental, índice de placa dental así como realizar encuestas de hábitos dietéticos a padres. Resultados: los pacientes con síndrome de Down, tuvieron un pH salival inicial neutro con un 50% pero sin gran diferencia al pH salival ácido con un 43%, al contrario el pH salival que se tomó después de 10 minutos de la ingesta de bebidas azucaradas, prevaleció el pH ácido con un 83% teniendo relación con la cantidad de caries encontradas en la muestra dentro de los rangos (bajo riesgo de caries 57% y moderado 22%) y placa dental presente en un 59% con nivel 2 de placa dental. Se verificó más frecuente el riesgo de caries en el sexo masculino con 59% y el rango de edad más afectado fue de 12 a 18 años. Conclusión: existe una estrecha relación entre el pH salival ácido y la caries ya que se encontró en todos los pacientes con una prevalencia entre los rangos bajo y moderado, con un alto nivel de placa dental Nivel 2 de placa dental) debiéndose principalmente a la poca higiene bucal.
Main regularities of polyethyleneterephtalate surface modification by oligoperoxides
Authors:   Lviv Polytechnic National University, 12 Bandera str., 79013 Lviv, Ukraine, Stetsyshyn Yurij , Donchak Volodymyr ,   Lviv Polytechnic National University, 12 Bandera str., 79013 Lviv, Ukraine, Harhay Khrystyna ,   Lviv Polytechnic National University, 12 Bandera str., 79013 Lviv, Ukraine, Voronov Stanislav ,   Lviv Polytechnic National University, 12 Bandera str., 79013 Lviv, Ukraine
Published: May 2021

The polyethyleneterephtalate surface has been modified with new oligoperoxides, synthesized on the base of pyromellitic acid chloroanhydride, polyethylene glycol-9 and tert-butylperoxymethanole. The developed method allows to achieve the degree of surface modification up to 64 %. Ability of dextrane macromolecules attaching onto peroxidized surface has been shown. The correlation between the degree of surface modification and oligoperoxide concentration in solution, temperature and time of the modification process has been established.
Analysis and Prediction of Landslide using Drone Image and GIS Techniques- Case Study Aranayaka Area
Authors:   Department of Civil Engineering, University of Moratuwa, Sri Lanka, Pushpakumara T.D.C. , Madushanka P.P.G.P. ,   Department of Civil Engineering, University of Moratuwa, Sri Lanka
Published: May 2021

Occurrence of Landslides has become a major impact considering the damage a landslide can do in a quick time. Among the natural hazards the country is exposed up to now, severe landslides are the upcoming major issue since it can affect to the lives of people too. In this case study from Aranayaka area, a method is developed to analyses and identify landslide prone areas. The methodology of the research includes collecting terrain data, building a model using geographic information system (GIS), satellite image processing, preparation of a landslide susceptibility potential map and giving recommendations on the landslide hazards. Among the factors that influence a landslide such as drainage, bedrock condition, slope angle range, land forms and etc. (published by National Building Research Organization), the foremost controllable and mostly varying factor. In this research, landslide prone areas are identified using the land use data. Identification of landslide hazards plays an important role in disaster management and risk controlling since a severe landslide can affect several aspects such as human lives, agricultural aspects, economic activities and transportation. This paper includes the background of the entire research that has developed up to current situation. This method can be used around the world as well as in the country.
Prototipe Smart Dor Lock Menggunakan Motor Stepper Berbasis Iot (Internet Of Things)
Authors: Soedjarwanto Noer
Published: May 2021

Internet of things adalah sebuah konsep yang bertujuan untuk memperluas manfaat dari konektivitas internet yang tersambung secara terus menerus . adapun kemampuan nya seperti berbagi data maupun sebagai remote control dan lain sebagainya. Maka dari itu penulis berinisiatif untuk membuat pengaman sekaligus pengontrol pintu dari jarak jauh untuk mempermudah pemilik rumah mengontrol keadaan kunci saat terbuka maupun sedang terkunci.

Aplikasi di rancang menggunakan mit inventor dengan berbagai vitur diantaranya tombol untuk membuka kunci dan menutup kunci dengan mengatur sudut dan arah gerak motor menggunakan driver motor steeper. kemudian pada aplikasi menampilkan notifikasi kondisi pintu saat di jalankan ,dan juga menampilkan berapa arus dan tegangan yang di gunakan saat menjalankan alat tersebut.

Hasil penelitian memperlihatkan bahwa semakin berat beban yang diberikan pada alat ini maka nilai daya saat membuka dan mengunci pintu tetap konstan. Prototype smart dor lock menampilkan data secara realtime dan hanya diberikan beban 0,08 kg , 0,115 kg, dan 0,170 kg.
Perbandingan Kinerja Multifactor Evaluation Process (MFEP) dengan Analytic Hierarchy Process (AHP) dalam menentukan mutasi karyawan (Studi Kasus pada PT Sumber Alfaria Trijaya, Tbk Departement Information Technology)
Authors: Komarudin Agus , Sari Reni Permata , Hafiz Aliy
Published: May 2021

Perkembangan dari sistem pengambilan keputusan saat ini terus meningkat, pada penelitian sebelumnya penulis hanya menggunakan salah satu metode, upaya meningkatkan kinerja dan pelaksanaan tugas bagi karyawan, dalam meningkatkan motivasi bagi karyawan, salah satu cara yang ditempuh dalam langkah nyata adalah mutasi karyawan sesuai dengan kriteria yang telah ditentukan antara lain absensi, mengisi joblist, kunjungan sesuai RPIT, disiplin, kerjasama team, inovasi, dan kominmen terhadap perusahaan dimana penulis akan menggunakan dua metode sistem pengambilan keputusan untuk mendapatkan perbandingan. Pada PT Sumber Alfaria Trijaya, Tbk Departement IT terbagi menjadi 2 Divisi, yaitu IT Office Support dan IT Store Support, IT Office Support bertugas memonitor dan maintenance semua aplikasi yang berjalan di Office serta DC, sedangkan IT Store Support bertugas memonitor dan maintenance semua aplikasi yang berjalan di Store/Toko. Pada tahun 2016 Manager dituntut oleh manajemen untuk mengurangi staff IT, baik pada IT Office Support maupun IT Store Support. IT Store Support 9 orang, IT Office Support 4 orang. Berdasarkan peraturan baru IT Store Support membutuhkan karyawan berdasarkan rasio 1:50 yaitu 1 orang  50 toko, jumlah toko saat ini 260 toko, jadi 260/50 = 5,2 jadi seharusnya hanya 5-6 orang untuk jumlah IT Store Support. Sedangkan IT Office Support Shift kerja dengan 3 Shift membutuhkan minimal 5 orang. Manager harus menentukan karyawan dengan jabatan IT Store Support akan di Mutasi 2 orang dan 1 orang pindah Divisi. Beberapa metode yang digunakan dalam SPK diantaranya adalah metode Multi Factor Evalution Process (MFEP) dan Analytic Hierarchy Process (AHP). Dengan adanya dua metode tersebut penulis ingin mengetahui metode manakah yang cocok untuk menentukan Mutasi Karyawan.
Evaluation of Distribution System Reliability Indices Using Fuzzy Reasoning Approach
Authors: Paci A. , Bualoti R. , Çelo M.
Published: May 2021

The most fundamental problems in the distribution system are the quality, the continuity, and the power supply. Political and economic changes were accompanied by changes in the structure of the electric load in the distribution network. Lack of investment and aging of the distribution company assets was accompanied by a decrease in the reliability of the distribution system. Identification and classification of assets from the point of view of their maintenance and replacement was one of the problems that were posed to the engineers. Fuzzy logic can be successfully used to evaluate distribution system reliability indices. In this paper fuzzy logic is used to evaluate the distribution system reliability indices of lines and transformers using six input variables. These variables considered the most important are: Age, Operation, Maintenance, Electrical current loading, Exposure and Weather conditions (Wind or Temperature). The fuzzy inferences knowledge-based IF-THEN rule is developed using Matlab Fuzzy software. The detailed analysis of the fuzzy system surfaces shows that the factors taken in consideration are dynamically and accurately connected to each other. The constructed rules based in engineering experience accurately represent the Reliability Indices.
Students Scientific Attitude in Learning Physics using Problem Based Learning Model with Experimental and Project Methods
Authors: Sakliressy Maura Trynovita , Sunarno Widha , Nurosyid Fahru
Published: May 2021

This research aims to determine the differences in the scientific attitudes of students who are given physics learning with the PBL model using experimental methods and project methods on static fluid material. The method used in this research is quantitative with a quasi-experimental approach using two independent group designs, namely the experimental group I using the PBL model-experimental method and the practical group II using the PBL model-project method. Subjects in this study were 65 students of class XI SMA YPPK Teruna Bakti obtained using cluster random sampling technique. Data obtained through a scientific attitude questionnaire instrument consisting of 15 items that have been tested for validity and reliability using SPSS 23.0.  Then, the prerequisite test (normality and homogeneity) was carried out and continued with hypothesis testing. The t-test result of 0.026 shows a difference in the average scientific attitude between students who are given learning using the PBL model with the experimental method and students who are given learning using the PBL model with the project method even though the average score for both. Not significantly different, namely in the experimental class 74.14 and the project class 70.10.
A comparison of orthopaedic trauma cases operated on during the COVID-19 pandemic with different periods: A single centre study
Authors: Akalın Yavuz , Ulusaloglu Can , Avci Ozgur , Cevik Nazan , Guler Olcay , Ozturk Alpaslan
Published: May 2021

Introduction: To compare orthopaedic trauma cases treated surgically in our clinic during the COVID-19 pandemic in Turkey with surgically-treated trauma cases in previous periods, and to discuss these in the light of literature. Materials and Methods: Patient data of 3 different periods were compared. Group 1 included cases in the time period March 11 - May 30, when the hospital was operating as a pandemic hospital for the COVID-19 pandemic in Turkey. Group 2 included cases from the equivalent time period the year before the pandemic, thought to have similar patient characteristics, and Group 3 covered the time period immediately before 11 March when COVID-19 was known in the world but there had not been any cases diagnosed in Turkey. Operations performed in our clinic because of orthopaedic trauma counts 186 patients in Group 1, 262 patients in Group 2, and 261 patients in Group 3. Results: A decrease of 29% was observed in trauma cases during the pandemic. In Group 1,62 of 186 patients were aged > 65 years, and 43 of these (69%) had a hip fracture, in Group 2,33 (58%) patients aged > 65 years underwent surgery for hip fracture, and in Group 3,60 (75%) patients. The time from hospital admission to surgery was mean 3.76 ± 3.55 days in Group 1, 3.18 ± 3.08 days in Group 2, and 2.68 ± 2.33 days in Group 3 (p = 0.017). The number of cases of attempted suicides was 6, 3, 3, respectively in the three groups (p = 0.184). 30-day mortality was determined in 5, 3, and 4 cases, respectively (p = 0.460). Conclusions: A decrease in the number of trauma cases was observed during the pandemic. However, there was no such decrease in hip fractures in elderly patients despite the quarantine of those aged > 65 years. The workforce of the clinic was divided up during the pandemic for the diagnosis and follow-up of COVID-19 cases and thus there was no reduction in the workload of orthopedists as trauma surgery continued at the rate of 71%. Therefore, strict regulations must be applied which will decrease the risk of the spread of infection, and implement a multidisciplinary workflow for a more rapid discharge of trauma patients.
When and for which patients should we perform ileal intubation and ileal biopsy during colonoscopy
Authors: Akturk Remzi , Serinsoz Serdar
Published: May 2021

Background: Terminal ileum intubation(TI) is an important part of a colonoscopy. In this study, we investigated whether patients should be selected according to their symptoms rather than taking a biopsy from all of them, or whether biopsies should be taken from patients with visual pathology only detected in the mucosa. Material and methods: Between 2008 and 2018, patients who underwent colonoscopy and ileal biopsy in our Endoscopy Unit were investigated. We evaluated patients with right iliac fossa pain, diarrhoea, and anaemia as well as patients with a high incidence of suspected inflammatory bowel disease (IBD) and high ileal abnormality in patients undergoing colonoscopy (group A). Patients with other indications were included in another group (Group B). Results: A total of 479 patients were planned for TI according to their symptoms and colonoscopy was performed. Both microscopic and macroscopic findings were found to be more prevalent in patients with right iliac fossa pain, diarrhoea (group A), and rectal bleeding, and significantly different from patients with other symptoms (group B) (p < 0.05). Conclusion: We recommend that patients undergoing colonoscopy with gastrointestinal complaints also undergo ileoscopy as much as possible and that blind biopsies be taken, at least in patients with symptoms suggestive of IBD even if the mucosa is macroscopically normal. The negative results we found strengthened the diagnosis of Irritable Bowel Syndrome (IBS) and made it easier for us to proceed with IBS treatment.
Acute lamotrigine overdose in adults: A case report
Authors: Janićijević Katarina , Kovačević Zoran , Glišić Miloš , Janićijević-Petrović Mirjana , Lazarević Tatjana
Published: May 2021

Introduction: Self-treatment with Lamotrigine rarely ends with toxicity, regardless of the suicidal intentions of the patient. The authors hereby present an illustrative case of the patient who has been treated with epilepsy therapy with Dandy-Walker syndrome and congenital epidermolysis bullosa (potentially skin-unwanted). Lamotrigine is a phenyltriazine-class, broad-spectrum antiepileptic and therapy of bipolar depression. Dandy-Walker syndrome is a pathological entity and represents the set of developmental, cerebral, but also other abnormalities of the organism. Epidermolysis bullosa is a hereditary, non-inflammatory skin disease with a mucous membrane of characteristic "bubbles". Case report: Our patient, a 37-year-old male was first admitted to the hospital department of Urgent Medicine of Clinical Center Kragujevac because he consumed two boxes of Lamotrigine tablets. In the receiving clinic, the patient showed respiratory failure and was urgently intubated. From medical documentation and hetero-anamnesis (obtained by his father), the authors found out that he was treated for epilepsy, Dandy-Walker syndrome, and congenital epidermolysis bullosa, which deteriorated with the use of Lamotrigine through potentially undesirable skin effects. During clinical observation, a lavage of gastric contents was conducted. The medical coal was used via nasogastric intubation as a detoxification method because of the patient's comatose state. Causative metabolic pathway of lamotrigine, the hemodialysis was performed. Conclusion: The case report of our patient points to the necessity of a multidisciplinary approach of the expert team, consisting of the clinical pharmacologist and toxicologist, neurologist, dermatologist, nephrologists, and other specialists, if necessary. Patients with Dandy-Walker syndrome require adequate socio-medical care.