bluuebunny/crossref_metadata_2025_split huggingface dataset:
Laboratory evidence for Krauklis-wave resonance in fractures and implications for seismic coda wave analysis
Authors: Shih Pei-Ju Rita , Frehner Marcel 
Published: September 2016

Krauklis waves are of major interest because they can lead to resonance effects in fluid-filled fractures. This resonance is marked by seismic signals with a dominant signature frequency, which may reveal fracture-related rock properties. In our laboratory study, we used homogeneous Plexiglas samples containing a single well-defined (i.e., manufactured) fracture. We recorded the signals obtained from propagating ultrasonic P- and S-waves (source frequency: 0.6, 1, and 2.25 MHz) along a sample without a fracture and samples with a fracture with different inclination angles of 30°, 45°, and 60° with respect to the short axis. The experimental results obtained from an incident S-wave confirmed that the presence of the fracture led to resonance effects at frequencies lower than the dominant source frequency, which slowly decayed over time in the recorded seismic coda after the first arrival. The resonance frequency was independent of the fracture orientation and the source frequency. We have interpreted this narrow-banded coda signal as a resonance in the fracture, and the frequency at which this occurred was an intrinsic property of the fracture size and elastic properties. To verify our laboratory results, we used an analytical solution, which provided a relationship between the fracture width, fracture length, resonance frequency, and temporal quality factor (i.e., exponential decay over time). The temporal quality factor obtained from our laboratory data agreed very well with the analytical solution. Hence, we concluded that the observed signature frequency (approximately 0.1 MHz) in the seismic coda was indeed a resonance effect. Finally, we have developed possible applications on the reservoir scale to infer fracture-related properties based on seismic coda analysis.
Prevalence of mental disorders in elderly people: The European MentDis_ICF65+ study
Authors: Andreas Sylke , Schulz Holger , Volkert Jana , Dehoust Maria , Sehner Susanne , Suling Anna , Ausín Berta , Canuto Alessandra , Crawford Mike , Da Ronch Chiara , Grassi Luigi , Hershkovitz Yael , Muñoz Manuel , Quirk Alan , Rotenstein Ora , Santos-Olmo Ana Belén , Shalev Arieh , Strehle Jens , Weber Kerstin , Wegscheider Karl , Wittchen Hans-Ulrich , Härter Martin 
Published: September 2016

BackgroundExcept for dementia and depression, little is known about common mental disorders in elderly people.AimsTo estimate current, 12-month and lifetime prevalence rates of mental disorders in different European and associated countries using a standardised diagnostic interview adapted to measure the cognitive needs of elderly people.MethodThe MentDis_ICF65+ study is based on an age-stratified, random sample of 3142 older men and women (65–84 years) living in selected catchment community areas of participating countries.ResultsOne in two individuals had experienced a mental disorder in their lifetime, one in three within the past year and nearly one in four currently had a mental disorder. The most prevalent disorders were anxiety disorders, followed by affective and substance-related disorders.ConclusionsCompared with previous studies we found substantially higher prevalence rates for most mental disorders. These findings underscore the need for improving diagnostic assessments adapted to the cognitive capacity of elderly people. There is a need to raise awareness of psychosocial problems in elderly people and to deliver high-quality mental health services to these individuals.
Women with bipolar disorder and pregnancy: factors influencing their decision-making
Authors: Dolman Clare , Jones Ian R. , Howard Louise M. 
Published: September 2016

BackgroundWomen with bipolar disorder are at increased risk of having a severe episode of illness associated with childbirth.AimsTo explore the factors that influence the decision-making of women with bipolar disorder regarding pregnancy and childbirth.MethodQualitative study with a purposive sample of women with bipolar disorder considering pregnancy, or currently or previously pregnant, supplemented by data from an online forum. Data were analysed using thematic analysis.ResultsTwenty-one women with bipolar disorder from an NHS organisation were interviewed, and data were used from 50 women's comments via the online forum of the UK's national bipolar charity. The centrality of motherhood, social and economic contextual factors, stigma and fear were major themes. Within these themes, new findings included women considering an elective Caesarian section in an attempt to avoid the deleterious effects of a long labour and loss of sleep, or trying to avoid the risks of pregnancy altogether by means of adoption or surrogacy.ConclusionsThis study highlights the information needs of women with bipolar disorder, both pre-conception and when childbearing, and the need for improved training for all health professionals working with women with bipolar disorder of childbearing age to reduce stigmatising attitudes and increase knowledge of the evidence base on treatment in the perinatal period.
Reduced neuronal size and mTOR pathway activity in the Mecp2 A140V Rett syndrome mouse model
Authors: Rangasamy Sampathkumar , Olfers Shannon , Gerald Brittany , Hilbert Alex , Svejda Sean , Narayanan Vinodh 
Published: September 2016

Rett syndrome (RTT) is a neurodevelopmental disorder caused by mutation in the X-linked MECP2 gene, encoding methyl-CpG-binding protein 2. We have created a mouse model (Mecp2 A140V “knock-in” mutant) expressing the recurrent human MECP2 A140V mutation linked to an X-linked mental retardation/Rett syndrome phenotype. Morphological analyses focused on quantifying soma and nucleus size were performed on primary hippocampus and cerebellum granule neuron (CGN) cultures from mutant (Mecp2A140V/y) and wild type (Mecp2+/y) male mice. Cultured hippocampus and cerebellar granule neurons from mutant animals were significantly smaller than neurons from wild type animals. We also examined soma size in hippocampus neurons from individual female transgenic mice that express both a mutant (maternal allele) and a wild type Mecp2 gene linked to an eGFP transgene (paternal allele). In cultures from such doubly heterozygous female mice, the size of neurons expressing the mutant (A140V) allele also showed a significant reduction compared to neurons expressing wild type MeCP2, supporting a cell-autonomous role for MeCP2 in neuronal development. IGF-1 (insulin growth factor-1) treatment of neuronal cells from Mecp2 mutant mice rescued the soma size phenotype. We also found that Mecp2 mutation leads to down-regulation of the mTOR signaling pathway, known to be involved in neuronal size regulation. Our results suggest that i) reduced neuronal size is an important in vitro cellular phenotype of Mecp2 mutation in mice, and ii) MeCP2 might play a critical role in the maintenance of neuronal structure by modulation of the mTOR pathway. The definition of a quantifiable cellular phenotype supports using neuronal size as a biomarker in the development of a high-throughput, in vitro assay to screen for compounds that rescue small neuronal phenotype (“phenotypic assay”).
Comparison of Wood Utility Crossarm Properties from 1995 and 2015
Authors: Catchot Tyler , Owens Frank C. , Shmulsky Rubin , Barnes H. M. 
Published: September 2016

Abstract
In response to changes in forest management and conversion practices, concern has arisen that some solid wood products manufactured today exhibit decreased strength and stiffness properties (modulus of rupture [MOR] and modulus of elasticity [MOE]) compared with those manufactured in the past. This study addresses those concerns by comparing the mechanical properties of wood utility crossarms sampled in 2015 with those of a similar sample of crossarms from 1995. Destructive bending tests were performed on crossarm samples of southern pine (Pinus spp.) and Douglas-fir (Pseudotsuga menziesii). These data were compared with data from a similar 1995 study by H. M. Barnes and J. E. Winandy (pp. 30–38, in Proc. 97th Annu. Meet. AWPA, 2001). The results showed a statistically significant difference (7.1% reduction) at the α = 0.01 level of mean MOR in southern pine and a statistically significant difference (13.3% reduction) at the α = 0.01 level of mean MOE in Douglas-fir. Distribution analyses also suggested a reduction of strength performance in the lower percentiles for both species groups between the two studies.
Objective and Perceived Weight: Associations with Risky Adolescent Sexual Behavior
Authors: Akers Aletha Y. , Cohen Elan D. , Marshal Michael P. , Roebuck Geoff , Yu Lan , Hipwell Alison E. 
Published: September 2016

CONTEXTStudies have shown that obesity is associated with increased sexual risk‐taking, particularly among adolescent females, but the relationships between obesity, perceived weight and sexual risk behaviors are poorly understood.METHODSIntegrative data analysis was performed that combined baseline data from the 1994–1995 National Longitudinal Study of Adolescent Health (from 17,606 respondents in grades 7–12) and the 1997 National Longitudinal Survey of Youth (from 7,752 respondents aged 12–16). Using six sexual behaviors measured in both data sets (age at first intercourse, various measures of contraceptive use and number of partners), cluster analysis was conducted that identified five distinct behavior clusters. Multivariate ordinal logistic regression analysis examined associations between adolescents’ weight status (categorized as underweight, normal‐weight, overweight or obese) and weight perception and their cluster membership.RESULTSAmong males, being underweight, rather than normal‐weight, was negatively associated with membership in increasingly risky clusters (odds ratio, 0.5), as was the perception of being overweight, as opposed to about the right weight (0.8). However, being overweight was positively associated with males’ membership in increasingly risky clusters (1.3). Among females, being obese, rather than normal‐weight, was negatively correlated with membership in increasingly risky clusters (0.8), while the perception of being overweight was positively correlated with such membership (1.1).CONCLUSIONSBoth objective and subjective assessments of weight are associated with the clustering of risky sexual behaviors among adolescents, and these behavioral patterns differ by gender.
Anatomic variations of the pancreatic duct and their relevance with the Cambridge classification system: MRCP findings of 1158 consecutive patients
Authors: Adibelli Zehra Hilal , Adatepe Mustafa , Imamoglu Cetin , Esen Ozgur Sipahi , Erkan Nazif , Yildirim Mehmet 
Published: September 2016

Abstract

Background
The study was conducted to evaluate the frequencies of the anatomic variations and the gender distributions of these variations of the pancreatic duct and their relevance with the Cambridge classification system as morphological sign of chronic pancreatitis using magnetic resonance cholangiopancreatography (MRCP).

Patients and methods
We retrospectively reviewed 1312 consecutive patients who referred to our department for MRCP between January 2013 and August 2015. We excluded 154 patients from the study because of less than optimal results due to imaging limitations or a history of surgery on pancreas. Finally a total of 1158 patients were included in the study.

Results
Among the 1158 patients included in the study, 54 (4.6%) patients showed pancreas divisum, 13 patients (1.2%) were defined as ansa pancreatica. When we evaluated the course of the pancreatic duct, we found the prevalence 62.5% for descending, 30% for sigmoid, 5.5% for vertical and 2% for loop. The most commonly observed pancreatic duct configuration was Type 3 in 528 patients (45.6%) where 521 patients (45%) had Type 1 configuration.

Conclusions
Vertical course (p = 0.004) and Type 2 (p = 0.03) configuration of pancreatic duct were more frequent in females than males. There were no statistically significant differences between the gender for the other pancreatic duct variations such as pancreas divisium, ansa pancreatica and course types other than vertical course (p > 0.05 for all). Variants of pancreas divisum and normal pancreatic duct variants were not associated with morphologic findings of chronic pancreatitis by using the Cambridge classification system. The ansa pancreatica is a rare type of anatomical variation of the pancreatic duct, which might be considered as a predisposing factor to the onset of idiopathic pancreatitis.
El itinerario subjetivo como herramienta de análisis
Authors: Hirai Shinji , Sandoval Rebeca 
Published: September 2016

Este artículo propone el uso del concepto “itinerario subjetivo” para analizar los elementos que componen el proceso migratorio de retorno de los jóvenes mexicanos de la generación 1.5. Con base en la descripción y el análisis de la narrativa de un joven que pertenece a esta generación de migrantes que retornó a México, se discutirán las características de esta movilidad de regreso y el proceso de resocialización, así como la forma en que los jóvenes retornados interpretan sus historias migratorias, narran sus emociones y su sentido de pertenencia, y construyen las expectativas de su futuro.
This article proposes the use of the concept “subjective itinerary” as an analytical tool to examine the elements that constitute the return migration process of Mexican youth who belong to the 1.5 generation. Drawing from the description and analysis of the narrative of a young 1.5 man who returned to Mexico, the characteristics of return mobility and socialization process will be discussed, as well as the ways in which young returnees interpret their own migration stories, narrate their emotions and sense of belonging, and build expectations for their future.
Policy Report ~ Informe
Authors: Gándara Patricia 
Published: September 2016

Millions of young people receive part of their education in the U.S. and part in Mexico. However, neither the U.S. nor Mexican schools are prepared to educate students from “the other side.” This commonly results in loss of school credit, poor academic preparation and dropping out, which leads to very limited job opportunities and wasted human talent. This article suggests several ways in which this problem can be addressed.
Millones de jóvenes reciben parte de su educación en los Estados Unidos y parte en México. Sin embargo, ni las escuelas de los Estados Unidos ni las de México están preparadas para educar a los estudiantes “del otro lado”. Esta situación comúnmente resulta en la pérdida de créditos escolares, la mala preparación académica y en el abandono de los estudios, lo que conduce a muy limitadas oportunidades de empleo y al desperdicio de talento humano. Este artículo sugiere varias maneras en las cuales se puede abordar este problema.
Synaptonemal Complex Components Are Required for Meiotic Checkpoint Function in Caenorhabditis elegans
Authors: Bohr Tisha , Ashley Guinevere , Eggleston Evan , Firestone Kyra , Bhalla Needhi 
Published: September 2016

Abstract
Synapsis involves the assembly of a proteinaceous structure, the synaptonemal complex (SC), between paired homologous chromosomes, and is essential for proper meiotic chromosome segregation. In Caenorhabditis elegans, the synapsis checkpoint selectively removes nuclei with unsynapsed chromosomes by inducing apoptosis. This checkpoint depends on pairing centers (PCs), cis-acting sites that promote pairing and synapsis. We have hypothesized that the stability of homolog pairing at PCs is monitored by this checkpoint. Here, we report that SC components SYP-3, HTP-3, HIM-3, and HTP-1 are required for a functional synapsis checkpoint. Mutation of these components does not abolish PC function, demonstrating they are bona fide checkpoint components. Further, we identify mutant backgrounds in which the instability of homolog pairing at PCs does not correlate with the synapsis checkpoint response. Altogether, these data suggest that, in addition to homolog pairing, SC assembly may be monitored by the synapsis checkpoint.
Pengaruh Macam dan Waktu Aplikasi Bahan Organik pada Tanaman Ubi Jalar (Ipomoea batatas L.) Var. Kawi
Authors: Suminarti Nur Edy , Susanto Susanto 
Published: September 2016

Diversifikasi pangan merupakan langkah tepat untuk mengantisipasi kondisi rawan pangan. Hal ini menjadi penting karena setiap tahun luas lahan basah telah mengalami penyusutan sekitar 0,1% dari total luas lahan di Indonesia. Sehubungan dengan hal tersebut, dan dalam upaya untuk memenuhi kebutuhan pangan nasional, maka pemanfaatan ubi jalar sebagai sumber bahan pangan alternatif perlu dilakukan. Penelitian yang bertujuan untuk mendapatkan informasi tentang macam dan waktu aplikasi bahan organik yang tepat telah dilakukan di Desa Landungsari, Kabupaten Malang. Rancangan yang digunakan adalah Petak Terpisah, macam bahan organik ditempatkan pada petak utama, terdiri dari 3 macam, yaitu pupuk kandang sapi, kompos azolla dan kompos sampah kota. Waktu aplikasi bahan organik sebagai anak petak, terdiri dari 3 macam, yaitu : 30 hari sebelum tanam, 15 hari sebelum tanam dan bersamaan tanam. Pengumpulan data dilakukan secara destruktif, meliputi komponen pertumbuhan dan panen, analisis pertumbuhan tanaman dan analisis tanah. Uji F taraf 5% ditujukan untuk menguji pengaruh perlakuan, sedang perbedaan diantara rata-rata perlakuan didasarkan pada nilai BNT taraf 5%. Interaksi nyata terjadi pada sebagian besar parameter yang diamati, dan hasil umbi tertinggi didapatkan pada kompos sampah kota yang waktu aplikasinya dilakukan 30 hari sebelum tanam : 28,03 ton umbi ha-1. Food diversification is a precise step to anticipate food shortage condition. It becomes important because wetland area is decreasing of approximately 0,1% each year of total area in Indonesia. Related to that point, also in order to meet food national demand, utilization of sweet potato as alternative food resource needs to be done. Research aimed to get information about proper kind and application time of organic matter had been done at Landungsari, Malang. The design used was Split Plot, kind of organic matter was placed as main plot, consisting of 3 kinds, ie: cow manure, azzola compost, and urban waste compost. Application time was set as subplot, consisting of 3 times, ie: 30 days before planting, 15 days before planting, and simultaneous with planting. Data collection was carried out destructively, including growth and yield components, plant growth analysis and soil analysis. F test on 5% level intended to test treatment effect, meanwhile difference between mean values based on LSD 5%. Real interaction occurred on almost all parameters observed, moreover the highest tuber yield was on urban waste compost which time application was 30 days before planting : 28,03 ton tuber ha-1.
La producción de recursos educativos y medios didácticos para una educación virtual asequible y accesible
Authors: Morales-Saldarriaga Juan Carlos 
Published: September 2016

Este artículo realiza una revisión a la Guía de Contenidos Web Accesibles de la World Wide Web Consortium (W3C), con el propósito de identificar técnicas de producción de contenidos educativos accesibles de bajo coste (asequibles), que sirvan como guía de trabajo para los equipos de producción de recursos educativos y medios didácticos de instituciones de educación en Colombia, que ofertan programas a distancia y virtual.
El análisis exigió una revisión bibliográfica sobre los conceptos de discapacidad, accesibilidad y usabilidad en entornos electrónicos, así como la identificación y descripción de normas nacionales e internacionales sobre cobertura y pertinencia educativa. El problema de investigación parte de la ausencia de una política nacional explícita sobre el diseño y la oferta de programas de formación profesional accesible, especialmente en modalidad a distancia (tradicional y virtual).
Como resultado de la investigación se diseñó un instrumento para valorar la accesibilidad en la producción de recursos educativos digitales, que describe tres niveles de cumplimiento y orienta a creadores y productores de contenido en la comprensión de los estándares definidos por la W3C.
Anomalous Diffusion Approach and Field Application for Fractured Nano-Porous Reservoirs
Authors: Albinali Ali , Ozkan Erdal 
Published: September 2016

Abstract
Anomalous diffusion concept is applied to model subdiffusive flow in heterogeneous, nanoporous media. The basis of anomalous diffusion is discussed and interpreted for heterogeneous flow domains based on the dual-porosity idealization of stimulated reservoir volume around fractured horizontal wells in unconventional reservoirs. Subdiffusion is considered in matrix and natural fractures independently of each other. Two unconventional field examples, one in the Eagle Ford and the other in the Niobrara, are analyzed using the homogeneous and dual-porosity medium idealizations with normal- and anomalous-diffusion models. The analyses by the normal-diffusion model yield estimates of permeability whereas the anomalous-diffusion models provide subdiffusion exponents and phenomenological coefficients of subdiffusive fluxes. It is shown that the dual-porosity, anomalous-diffusion model provides additional information compared to normal-diffusion models, which helps us infer about the reservoir-rock quality and stimulation efficiency.
Abandonment of a Stimulated Gas Reservoir
Authors: Muhammad Danish Syed , Krishnan Gopi , Khan Faisal 
Published: September 2016

Abstract
This paper highlights the limitations faced along with the respective solutions proposed and executed during the plug and abandonment of a highly permeable and stimulated carbonate gas reservoir during its exploration phase after having performed an extended pressure buildup (PBU) test.
To accurately compute the hydrocarbon reserves of a particular region and determine future field development, operators need to explore new reservoirs in both offshore and onshore challenging environments. The services performed on these wells include drill-stem test (DST) completion, underbalance perforation, acid stimulation, placing downhole gauges/shut-in tools, extended flowback/PBU periods, and final zonal isolation.
In this candidate well, the operator wanted to test three zones, further performing high-rate acid fracturing on the lower two zones to determine commercial hydrocarbon gas rates. The first major challenge was the zonal isolation of the lower-most zone. A cement plug was designed to be deployed by means of coiled tubing (CT) for accurate placement and depth control. The added challenge in this exploratory well was to plug any wellbore channels and permeable fractured streaks after acid stimulation while preventing excessive cement fluid loss.
This paper explains the innovative solution that was custom-designed for this well and the execution procedure. It also elaborates on the combined use of CT intervention, custom-designed chemical blends, a cement slurry system, and implementation of best practices to achieve successful zonal abandonment. The operation consisted of three runs: the first included a batch of an organically crosslinked polymer with loss circulation material (LCM) in the solution; the second was a cleanout operation and displacement followed by permanent cement slurry placement; and, after waiting on cement (WOC), the third run was performed to tag the top of cement (TOC) and test the integrity of the cement plug. The organically crosslinked polymer with LCM solids served to bridge off the perforation tunnels and potential fractures in the rock so that a precise volume of cement plug slurry could be pumped safely and accurately.