bluuebunny/crossref_metadata_2025_split huggingface dataset:
Diseño y validación de un índice de estrés académico basado en factores contextuales mediante técnicas multivariantes
Authors: Bravo Saltos Rosalba Karen , Chacon Contreras Ana Ides 
Published: February 2025

El presente estudio tuvo como objetivo diseñar y validar un índice de estrés académico basado en factores contextuales mediante técnicas multivariantes. Para ello, se llevó a cabo un estudio cuantitativo y transversal con la participación de 1.253 estudiantes universitarios. Se aplicó un cuestionario estructurado para evaluar los factores de afrontamiento del estrés académico y se utilizó el análisis de componentes principales para sintetizar la información en una métrica cuantificable. El índice desarrollado permitió clasificar a los estudiantes en función de su nivel de estrés, estableciendo un umbral de corte mediante el análisis de curva ROC. Los resultados mostraron una sensibilidad del 83.5% y una especificidad del 80%, lo que indica una alta capacidad predictiva del instrumento. Además, se identificó que los principales factores asociados al estrés académico fueron la sobrecarga de tareas, las metodologías docentes y las expectativas de rendimiento. Este estudio contribuye al desarrollo de herramientas objetivas para evaluar el estrés académico en entornos universitarios, permitiendo la identificación de estudiantes en riesgo y facilitando el diseño de estrategias de intervención. La aplicación del índice en futuros estudios podrá mejorar el monitoreo del bienestar estudiantil y la implementación de políticas para mitigar el impacto del estrés en la vida académica.
Analisis Gender Pada Ketahanan Keluarga Pekerja Migran Indonesia (PMI) Di Desa Jatiroto Lor Kabupaten Lumajang
Authors: Nasihah Fazdilatun , Baidillah Ifadah Maziah , Nurhayati Alfisyah , Arif Muhammad Ridwan 
Published: February 2025

Melihat kondisi sosial Desa Jatiroto Lor Kabupaten Lumajang yang minat warganya, terutama remaja wanita dan para istri yang mau bekerja di luar Negeri menjadi Pekerja Migran Indonesia (PMI) ini cukup menggugah penulis untuk melakukan pemberdayaan, guna memini malisir dampak negative yang ditimbulkan serta memberikan trobosan baru agar masyarakat Desa Jatiroto Lor Kabupaten Lumahang lebih produktif, sehingga masyarakat mampu membuka lapangan pekerjaan sendiri agar tidak lagi harus ke luar Negeri sebagai Pekerja Migran Indonesia (PMI). Penelitian menggunakan pendekatan kualitatif. Teknik penentuan informan dalam penelitian ini adalah teknik purposive sampling atau sampling. Hasil penelitian menunjukkan, dalam pengasuhan yang dilakukan oleh ayah, tante atau nenek menggunakan pola asuh permisif memanjakan dan otoriter. Pola pengasuhan permisif memanjakan dipilih karena merasa kasihan terhadap anak karena orang tua/ibunya bekerja di luar negeri dalam waktu yang lama, sedangkan pola pengasuhan otoriter keluarga lebih suka menghukum anak secara fisik dalam menyelesaikan masalah dan tidak bersedia mendengarkan pendapat anak. Perbedaan pola pengasuhan tersebut disebabkan karena faktor ekonomi, keluarga yang kurang mampu cenderung menggunakan pola pengasuhan otoriter, sedangkan keluarga yang berkecukupan cenderung menggunakan pola pengasuhan permisif memanjakan.
E-commerce y su impacto en el crecimiento de las PYMES
Authors: Ronquillo Alvarez Luz Marina , Mario Rolando Martínez Vergara , Moreno Herrera Ivanna Carolina 
Published: February 2025

El comercio electrónico (e-commerce) ha transformado la forma en que las pequeñas y medianas empresas (PYMES) operan y compiten en el mercado global. A medida que la digitalización avanza, las PYMES han encontrado en el e-commerce una oportunidad para expandir sus mercados, reducir costos operativos y mejorar la experiencia del cliente. Este estudio analiza los beneficios y desafíos de la adopción del comercio electrónico en las PYMES, considerando su impacto en la rentabilidad, eficiencia y competitividad. Además, se presentan estrategias clave para una integración efectiva del e-commerce en estos negocios, abordando aspectos tecnológicos, organizativos y financieros. A través de una revisión bibliográfica y una metodología estructurada, se identifican los factores críticos que influyen en el éxito del comercio electrónico en las PYMES. La investigación destaca que, aunque el e-commerce puede generar mejoras significativas en términos de ingresos y optimización de procesos, su implementación sigue enfrentando barreras como la falta de infraestructura digital, resistencia al cambio y limitaciones económicas. Para superar estos desafíos, es fundamental una planificación estratégica adecuada, apoyada por políticas gubernamentales y programas de capacitación. Este artículo proporciona un marco de referencia para que las PYMES puedan evaluar y optimizar su estrategia de comercio electrónico, asegurando una transformación digital sostenible y eficiente. Finalmente, se sugieren futuras investigaciones sobre el impacto de tecnologías emergentes, como la inteligencia artificial y blockchain, en la evolución del comercio digital para PYMES
Interdisciplinary Look at Lifestyles in School Population. Pereira
Authors: Enith Velásquez-Restrepo Luz , Márquez-Galvis Mónica M. , Arboleda-Amórtegui Gleydis , Rodríguez-Amador Tatiana , César Zapata-Giraldo, Paulo 
Published: February 2025

This document presents the lifestyles of the student population enrolled in the Official Educational Institution. Pereira. Objective: To recognize lifestyles in the student population of the Educational Center 30 de Agosto, during the year 2018. Type of descriptive cross-sectional study, 49 boys and girls participated. Interdisciplinary research in Optometry, Respiratory Therapy, Radiology, and Diagnostic Imaging and Nursing, an instrument developed by the authors, validated by experts, allowed observing practices on Care and self-care. Results: Their families in 37% are extensive; Diet shows a high preference for foods rich in flour and sugar, they carry out physical activity. 47% of boys and girls have nighttime awakenings. 57% are taken to growth and development control. The use of insufficient protection elements; 99% do not report alcohol or tobacco consumption. Boys and girls collect and separate waste. Discussion: Vulnerable population, female population predominates in all age groups, there is a high preference for foods rich in flour and sugar, in tune with the diet of the region, the lack of restful sleep has consequences in the performance and development of activities daily as school activities, one of the important aspects in the studied population is the care habits they have and their permanence in them, in general, the evaluated aspects show difficulties in the self-care processes, the use of free time is compared with the unrelated physical activity as wellness in context. Conclusions: Diet suffers from deficiencies, consumption of sugary drinks, fats, flours, low intake of fruits and vegetables predominates, the sleep period is affected.
Standing to Enforce the Future: Citizen Suits and Climate Change
Authors: Budd Jordan , McCabe Margaret Sova 
Published: February 2025

This Article takes as its starting point the premise that Congress, facing an existential climate catastrophe, might choose to impose direct and significant restrictions on greenhouse gas (GHG) emissions. Were it to do so, federal policy would require powerful enforcement mechanisms to reach the myriad emission sources fueling the nation’s vast contribution to global warming.
Among the most potent and far-reaching enforcement tools available to Congress are citizen suits—actions brought by private litigants to enforce federal regulations and to hold agencies accountable for related inaction. Private enforcement in the context of climate change, however, faces a nearly insurmountable barrier—Article III standing as framed by the current Supreme Court. As this Article explains, the nature of climate injuries resulting from GHG emissions makes it impossible for private litigants suing for their redress to satisfy the highly restrictive requirements of the Court’s contemporary standing doctrine.
To preserve citizen suits as a central enforcement mechanism in a robust federal GHG regulatory program, the Article proposes that Congress think expansively about the kind of activities that it identifies for regulatory action. In addition to direct limitations on GHG emissions, primarily enforceable only through administrative action due to standing constraints, Congress should include parallel restrictions on separate injury-inflicting commercial activities that are essential for GHG emission sources to function. Private litigants injured by such prerequisite commercial activities will have standing to enforce regulations restricting their operation, with the collateral effect of restricting any dependent emission source as well. The Article illustrates how the regulation of prerequisite activities could powerfully enhance the enforcement of federal GHG restrictions by examining the prerequisite role played by concentrated animal feeding operations in facilitating the cattle and dairy industry and its significant contribution to the nation’s greenhouse gas emissions.
Integration and Innovation in the Improvisational Thinking of the Pipa Player Wu Man
Authors: Ma Yao 
Published: February 2025

Wu Man's impromptu Pipa music is an essential and active attempt in the context of world music, which brings many inspirations to the innovative integration of traditional Chinese folk music. This paper explores various efforts to integrate traditional Chinese folk music into the global music scene by examining approaches in composition, technique, timbre, and performance styles. It uses listening, performance practices, music analysis, participation, and on-site observation to assess how these elements can be successfully merged within a global context.
Chinese Period Dramas as "Lieux de Mémoire": Unpacking Dispersion, Ritual, and Narrative in Chinese Society
Authors: Ma Ying 
Published: February 2025

This study examines Chinese period dramas as lieux de mémoire (sites of memory), as defined by Pierre Nora, to explore how they carry and perform the collective memory of Chinese society. By analyzing three dimensions within these dramas—the "dispersion" represented in spatial configurations, the "rituals" of emotional interaction, and the "narratives" that sculpt time—this paper reveals the significant role of period dramas in constructing cultural identity, maintaining the social structure of feeling, and reshaping historical cognition. The research finds that period dramas, through the intertwined presentation of individual memory, communicative memory, and cultural memory, construct a dynamic memory space and participate in the cultural politics of contemporary China. This study expands the application of Nora's theory of lieux de mémoire and offers a new perspective for understanding the complex relationship between media, memory, and society.
A nicotinamide metabolism-related gene signature for predicting immunotherapy response and prognosis in lung adenocarcinoma patients
Authors: Wang Meng , Li Wei , Zhou Fang , Wang Zheng , Jia Xiaoteng , Han Xingpeng 
Published: February 2025

Background
Nicotinamide (NAM) metabolism fulfills crucial functions in tumor progression. The present study aims to establish a NAM metabolism-correlated gene (NMRG) signature to assess the immunotherapy response and prognosis of lung adenocarcinoma (LUAD).

Methods
The training set and validation set (the GSE31210 dataset) were collected The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO), respectively. Molecular subtypes of LUAD were classified by consensus clustering. Mutation landscape of the top 20 somatic genes was visualized by maftools package. Subsequently, differential expression analysis was conducted using the limma package, and univariate, multivariate and LASSO regression analyses were performed on the screened genes to construct a risk model for LUAD. Next, the MCP-counter, TIMER and ESTIMATE algorithms were utilized to comprehensively assess the immune microenvironmental profile of LUAD patients in different risk groups. The efficacy of immunotherapy and chemotherapy drugs was evaluated by TIDE score and pRRophetic package. A nomogram was created by integrating RiskScore and clinical features. The mRNA expressions of independent prognostic NMRGs and the migration and invasion of LUAD cells were measured by carrying out cellular assays.

Results
Two subtypes (C1 and C2) of LUAD were classified, with C1 subtype showing a worse prognosis than C2. The top three genes with a high mutation frequency in C1 and C2 subtypes were TTN (45.25%), FLG (25.25%), and ZNF536 (19.8%). Four independent prognostic NMRGs (GJB3, CPA3, DKK1, KRT6A) were screened and used to construct a RiskScore model, which exhibited a strong predictive performance. High-risk group showed low immune cell infiltration, high TIDE score, and worse prognosis, and the patients in this group exhibited a high drug sensitivity to Cisplatin, Erlotinib, Paclitaxel, Saracatini, and CGP_082996. A nomogram was established with an accurate predictive and diagnostic performance. GJB3, DKK1, CPA3, and KRT6A were all high- expressed in LUAD cells, and silencing GJB3 inhibited the migration and invasion of LUAD cells.

Conclusion
A novel NMRG signature was developed, contributing to the prognostic evaluation and personalized treatment for LUAD patients.
ON A DOUBLE BIFURCATION QUASILINEAR PROBLEM ARISING IN THE STUDY OF ANISOTROPIC CONTINUOUS MEDIA
Authors: Şt. Cîrstea Florica-Corina , Rădulescu Vicenţiu D. 
Published: July 2002

AbstractWe study the bifurcation problem$$ \begin{cases} -\Div(a(x)|Du|^{p-2}Du)+h(x)u^{r-1}= f(\lambda,x,u) & \text{in } \sOm\subset\RR^{N}, \\ a(x)|Du|^{p-2}Du\cdot n+b(x)u^{p-1}=\theta g(x,u) & \text{on }\sGa, \\ u\geq0,\quad u\not\equiv0 & \text{in }\sOm, \end{cases} $$where $\sOm$ is an unbounded domain with smooth non-compact boundary $\sGa$, $n$ denotes the unit outward normal vector on $\sGa$, and $\lambda>0$, $\theta$ are real parameters. We assume throughout that $p lt r lt p^{*}=pN/ (N-p)$, $1 lt p lt N$, the functions $a$, $b$ and $h$ are positive while $f$, $g$ are subcritical nonlinearities. We show that there exist an open interval $I$ and $\lambda^\star gt 0$ such that the problem has no solution if $\theta\in I$ and $\lambda\in (0,\lambda^\star)$. Furthermore, there exist an open interval $J\subset I$ and $\lambda_0 gt 0$ such that, for any $\theta\in J$, the above problem has at least a solution if $\lambda\geq \lambda_0$, but it has no solution provided that $\lambda\in (0,\lambda_0)$.AMS 2000 Mathematics subject classification: Primary 35J60; 35P30; 58E05; 58G28
HIGHER-ORDER ESTIMATES FOR FULLY NONLINEAR DIFFERENCE EQUATIONS. II
Authors: Holtby Derek W. 
Published: July 2002

AbstractThe purpose of this work is to establish a priori $C^{2,\alpha}$ estimates for mesh function solutions of nonlinear difference equations of positive type in fully nonlinear form on a uniform mesh, where the fully nonlinear finite difference operator $\F$ is concave in the second-order variables. The estimate is an analogue of the corresponding estimate for solutions of concave fully nonlinear elliptic partial differential equations. We use the results for the special case that the operator does not depend explicitly upon the independent variables (the so-called frozen case) established in part I to approach the general case of explicit dependence upon the independent variables. We make our approach for the diagonal case via a discretization of the approach of Safonov for fully nonlinear elliptic partial differential equations using the discrete linear theory of Kuo and Trudinger and an especially agreeable mesh function interpolant provided by Kunkle. We generalize to non-diagonal operators using an idea which, to the author’s knowledge, is novel. In this paper we establish the desired Hölder estimate in the large, that is, on the entire mesh $n$-plane. In a subsequent paper a truly interior estimate will be established in a mesh $n$-box.AMS 2000 Mathematics subject classification: Primary 35J60; 35J15; 39A12. Secondary 39A70; 39A10; 65N06; 65N22; 65N12
Hydrodynamical similarities between bubble column and bubbly pipe flow
Authors: MUDDE ROBERT F. , SAITO TAKAYUKI 
Published: July 2002

The hydrodynamical similarities between the bubbly flow in a bubble column and in a
pipe with vertical upward liquid flow are investigated. The system concerns air/water
bubbly flow in a vertical cylinder of 14.9 cm inner diameter. Measurements of the
radial distribution of the liquid velocity, gas fraction and the bubble velocity and size
are performed using laser Doppler anemometry for the liquid velocity and a four-point
optical fibre probe for the gas fraction, bubble velocity and size. The averaged
gas fraction was 5.2% for the bubble column (with a superficial liquid velocity of
zero) and 5.5% for the bubbly pipe flow at a superficial liquid velocity of 0.175 m s−1.
From a hydrodynamical point of view, the two modes of operation are very similar.
It is found that in many respects the bubbly pipe flow is the superposition of the
flow in the bubble column mode and single-phase flow at the same superficial liquid
velocity.The radial gas fraction profiles are the same and the velocity profiles differ only
by a constant offset: the superficial liquid velocity. This means that the well-known
large-scale liquid circulation (in a time-averaged sense) of the bubble column is also
present in the bubbly pipe flow. For the turbulence intensities it is found that the
bubbly pipe flow is like the superposition of the bubble column and the single-phase
flow at the superficial liquid velocity of the pipe flow, the former being at least an
order of magnitude higher than the latter. The large vortical structures that have been
found in the bubble columns are also present in the bubbly pipe flow case, partly
explaining the much higher ‘turbulence’ levels observed.
Direct numerical simulation of a puff and a slug
in transitional cylindrical pipe flow
Authors: SHAN H. , MA B. , ZHANG Z. , NIEUWSTADT F. T. M. 
Published: July 2002

A direct numerical simulation of transitional pipe flow is carried out with the help of
a spectral element method and used to investigate the localized regions
of ‘turbulent’
flow that are observed in experiments. Two types of such regions can be distinguished:
the puff and the slug. The puff, which is generally found at low values of the Reynolds
numbers, is simulated for Re = 2200 where the Reynolds number
Re is based on the mean velocity UB
and pipe diameter D. The slug occurs at a higher Reynolds number
and it is simulated for Re = 5000. The computations start with a laminar pipe flow
to which is added a prescribed velocity disturbance at a given axial position and for
a finite time. The disturbance then evolves further into a puff or slug structure.The simulations confirm the experimentally observed fact that for a puff the
velocity near the leading edge changes more gradually than for a slug where an
almost discontinuous change is observed. The positions of the leading and trailing
edges of the puff and slug are computed from the simulations as a function of time.
The propagation velocity of the leading edge is found to be constant and equal
to 1.56UB and 1.69UB for the
puff and slug, respectively. For the trailing edge the
velocity is found to be 0.73UB and
0.52UB, respectively. By rescaling the simulation
results obtained at various times to a fixed length, we define an ensemble average.
This method is used to compute the average characteristics of the puff and slug such
as the spatial distribution of the mean velocity, the turbulent velocity fluctuations and
also the wall shear stress. By computing particle trajectories we have investigated the
entrainment and detrainment of fluid by a puff and slug. We find that the puff detrains
through its trailing edge and entrains through its leading edge. The slug entrains fluid
through its leading and through most of its trailing edge. As a consequence the fluid
inside the puff is constantly exchanged with fluid outside whereas the fluid inside a
slug remains there. These entrainment/detrainment properties which are in agreement
with the measurements of Wygnanski & Champagne (1973) imply that the puff has
the characteristics of a wave phenomenon while the slug can be characterized more
as a material property which travels with the flow.Finally, we have investigated in more detail the velocity field within the puff. In a
coordinate system that travels with the mean velocity we find recirculation regions
both near the trailing and leading edges which agrees at least qualitatively with
experimental data. We also find streamwise vortices, predominantly in the trailing-edge region which have been also observed in experiments and which are believed to
play an important role in the dynamics of the transition process.
Interpretations of God's eternity
Authors: EVERITT NICHOLAS 
Published: July 2002

…even from everlasting to everlasting, thou art

God (Psalms 90.2)A number of authors, including contributors to this journal,

have argued that the only consistent interpretation of

God's eternal existence attributes

to God an atemporal existence. Their argument seeks to show

that it would be self-contradictory to adopt the opposing

interpretation that God exists in time, and has

indeed existed for an infinite past time. This paper argues

that their objections to

infinite past existence all turn on a misunderstanding of

what that concept involves.

The theist is therefore not compelled to adopt the atemporal

interpretation, but can

instead adopt the more intuitively intelligible thesis that

God is in time.
Global Radionavigation – The Next 50 Years and Beyond
Authors: Beukers John M. 
Published: July 2002

This, and the following four papers, were first presented at the NAV99/ILA28 Conference
on ‘Loran-C, Satellite and Integrated Systems for the 21st Century’ held at Church House,
Westminster, London, 1st–3rd November 1999.Just 25 years ago, the author presented a paper at the 30th Annual Meeting of the United
States Institute of Navigation (ION) entitled ‘Radionavigation in North America, the Next
25 Years’. The paper received much attention and was given the ION's Burka Award for the
best paper of the year. The author attempted to predict the worldwide implementation of
Loran-C and Omega while acknowledging that satellite technology was on the horizon.
‘Global Radionavigation – The Next 50 Years and Beyond’ builds on the previous paper and
is an attempt to define the future of global radionavigation based upon a mix of terrestrial
and satellite systems. The time it takes for satellite systems and augmentations to mature and
the reasons for this extended period provide the foundation of the paper. Also discussed are:
the time to achieve a full constellation of space vehicles having signal specifications that meet
the requirements for safety-of-life, the political complexities to achieve international
harmonisation of service, and the use of a common worldwide protected frequency spectrum.
The need for terrestrial complements is presented from the standpoint of supporting satellite
systems and as a back-up in the event of loss of satellite services.