bluuebunny/crossref_metadata_2025 huggingface dataset:
On maximum degree (signless) Laplacian matrix of a graph
Authors: Rangarajan R , Raghu V. D. , Rakshith B. R.
Published: November 2022

Let G be a simple graph on n vertices and v1, v2,...,vn be the vértices of G. We denote the degree of a vertex vi in G by dG(vi) = di. The maximum degree matrix of G, denoted by M(G), is the real symmetric matrix with its ijth entry equal to max{di, dj} if the vertices vi and vj are adjacent in G, 0 otherwise. In analogous to the definitions of Laplacian matrix and signless Laplacian matrix of a graph, we consider Laplacian and signless Laplacian for the maximum degree matrix, called the maximum degree Laplacian matrix and the maximum degree signless Laplacian matrix, respectively. Also, we introduce maximum degree Laplacian energy and maximum degree signless Laplacian energy of a graph. Then we determine the maximum degree (signless) Laplacian energy of some graphs in terms of ordinary energy, and (signless) Laplacian energy. We compute the máximum degree (signless) Laplacian spectra of some graph compositions. A lower and upper bound for the largest eigenvalue of the maximum degree (signless) Laplacian matrix is established and also we determine an upper bound for the second smallest eigenvalue of maximum degree Laplacian matrix in terms of vertex connectivity. We also determine bounds for the maximum degree (signless) Laplacian energy in terms of first Zagreb index.
Redescriptions of four nereidid species (Annelida: Phyllodocida: Nereididae) from the Atlantic Ocean described by Aaron Louis Treadwell
Authors: Conde-Vela Victor Manuel
Published: November 2022

Aaron Louis Treadwell proposed a large number of new taxa, and several of them are regarded as synonyms. Treadwell proposed 32 new species in the family Nereididae, and a few of them have been re-evaluated. Here, the validity of 4 species is reassessed based on the examination of type material of 3 Nereis species and 1 Perinereis: N. arroyensis, N. largoensis, and P. diversidentata are regarded as valid species, and the synonymy of Nereis disparsetosa Treadwell, 1932 with Pseudonereis palpata (Treadwell, 1923) is confirmed. A commented table of the nereidid species proposed by Treadwell is also included.
Landscape analysis for the American crocodile Crocodylus acutus (Reptilia: Crocodilidae) in northwestern Costa Rica
Authors: Sandoval-Hernández Iván , Bolaños-Montero Juan Rafael , Sasa-Marín Mahmood , Monrós-González Juan Salvador
Published: November 2022

Northwest Costa Rica has the largest crocodile population in the country, but it is also an important area of the human population growth, tourism, crops, and aquaculture, that have generated great changes in the region. A landscape analysis for the American crocodile, Crocodylus acutus, was conducted to determine which landscape variables may benefit the reptile. The analysis included the Tempisque Great Wetlands (TGW) and the Central Pacific (CP). The TGW had a higher linear density of rivers and roads, and more extensive wetlands and flood zones, whereas the CP had a higher number of towns. Forest coverage was recovering in both regions, although the rate of recovery was different. The values of the fractal dimension (FD), the shape index (SI), the Shannon diversity index, and the equity index increased slightly in both zones, indicating that fragmentation is increasing in the study area. The average density of crocodiles was correlated with change in coverage per year (rs = 0.74) and with FD and SI (rs = 0.65 for both). In the CP, the density of crocodiles was also correlated with change in coverage per year (rs = 0.48) and with FD and SI (rs = 0.93 and 0.74, respectively).
A new species of Lachesilla (Psocodea: Psocomorpha: Lachesillidae) in the L. texcocana species group, from El Triunfo Biosphere Reserve, Chiapas, Mexico
Authors: García-Aldrete Alfonso Neri
Published: November 2022

A species of Lachesilla, in the L. texcocana species group, endemic to El Triunfo Biosphere Reserve, Chiapas, Mexico, is described and illustrated. Based on female characters (male is unknown), it is close to L. gamma García-Aldrete, from which it differs in the shape and size of the underlying pigmented area of the subgenital plate. It is the third species of the L. texcocana species group recorded in the state of Chiapas.
Diversity of insects associated with the fruits of four tree species of Lauraceae from Los Tuxtlas region, Mexico: an annotated and illustrated taxonomic list
Authors: Rodríguez-Sánchez Edna , Giraldo-Kalil Laura J. , Núñez-Farfán Juan
Published: November 2022

Besides recruitment and dispersal, fruits are key resources for the maintenance of insect communities. This study is focused on the insects inhabiting the fruits of 4 wild Lauraceae species. Although the trees of this family are important elements of tropical forests, their interaction with insects, especially in association with fruits, remains poorly studied in wild tree species. Our study aims to characterize the diversity of insects associated with fruits of Damburneya ambigens, Damburneya gentlei, Damburneya salicifolia, and Nectandra turbacensis, in the rainforest of Los Tuxtlas, Veracruz. We present an illustrated taxonomic list of species, annotated with a comprehensive review of the insects’ natural history and their interactions with Lauraceae species. We reared 54 insect species from approximately 6,500 fruits, some of which represent potential new species and records for Mexico. Insect species diversity was high and differed between Lauraceae species. The reared insects comprise a wide variety of distributional ranges, feeding types, and habitats. This research provides novel information about the interactions among insects and fruits of Lauraceae and the complexity of their trophic networks in tropical rainforests. Furthermore, it evidences the importance of wild fruits as resources for insect communities.
Population dynamics of the crayfish Cambarellus chapalanus from the San Juan Cosalá Mountain Range, Jalisco, Mexico
Authors: Cáceres Ignacio , Ibarra-García Esmeralda Citlali , Rodríguez-Zaragoza Fabián Alejandro , Ayón-Parente Manuel
Published: November 2022

Cambarellus chapalanus is an endemic species of the area around Lake Chapala in Mexico and knowledge about its biology and ecology is scarce. Its population dynamics were evaluated based on individual growth, mortality, production, and productivity. For this, individuals were collected between November 2011 and October 2012, in ponds located in the Sierra San Juan Cosalá, Jalisco, Mexico. The abiotic variables of ponds (depth, temperature, pH, precipitation, and evaporation) presented significant variations during the study. Abundance was similar throughout the year but was related to an increase in temperature and evaporation of ponds. Furthermore, males were more abundant than females. Growth was fast and oscillatory with slow phases in rainy periods. Mortality was high and started at medium sizes; however, high somatic production also generated high population productivity. In general, the parameters of C. chapalanus showed normal patterns for a natural population; however, were strongly influenced by temperature and pond volume, probably because it is an isolated population in Sierra San Juan Cosalá.
Performing of Concrete by Replacing Aggregate with Plastic Waste Generated During Covid19
Authors: Tripathi Shivendra Mani , Kumar Sunil
Published: November 2022

Abstract: Biomedical waste management is becoming increasingly important to satisfy sustainability goals and to meet the growing demand for medical services around the world. When considering recycling and incineration methods from an environmental perspective, over 80% of published Life Cycle Assessment studies believe recycling is better. Furthermore, among the many recycling methods, the use of various waste materials such as aggregates and fibers in the cement manufacturing process is considered to be an environmentally friendly, safe and reliable method. Useful. Nephrology, especially dialysis, is a major producer of polymer waste (BPW) in medical practice. After each treatment, 1.5-8 kg (400 kg / patient / year) of BPW is removed by burial or cremation. Most polymers are not biodegradable, so they accumulate inside. Previous studies have shown that incineration sterilization 49-60% BPW, autoclaving 20-37% and other sterilization methods 4-5%. Other methods, such as autoclaves and microwave ovens, are considered more environmentally friendly than incineration and produce the same waste after treatment. It must be disposed of by burning, increasing disposal costs and eliminating the need for waste. This study shows a positive relationship with the BPW environment through dialysis treatment and the participation of healthcare and industry partners in challenging situations. After each dialysis treatment, 1.5-8 kg (400 kg / patient / year) of total biomedical waste (BPW) is filled or stored. Additionally, this study will provide information to engineers, designers and construction managers on the use of reinforced concrete in BPW and equipment predictions based on current international standards and regulations.
Revisión integrativa de la calidad de vida en el trabajo de enfermeras latinoamericanas
Authors: Cueva-Pila Guadalupe , Valenzuela Suazo Sandra , Alvarado Alvarado Ana Lucia , Hidalgo Ortiz Juan Pablo
Published: November 2022

Introducción:  La calidad de vida en el trabajo (CVT) o calidad de vida laboral (CVL) expresa la satisfacción de los trabajadores, en este caso enfermeras, que está directamente relacionada con la seguridad y calidad del cuidado del paciente. Objetivo: Identificar, desde la literatura científica, niveles de satisfacción con la calidad de vida en el trabajo de las enfermeras latinoamericanas, factores de riesgo asociados y repercusiones en la salud. Metodología: Se realizó una revisión integrativa en bases de datos PubMed, SciELO, BVS y Google Académico relacionado con estudios publicados en el período enero 2011 - agosto 2021, en inglés, portugués y español. Resultados: Se seleccionaron 13 artículos que cumplieron los criterios de inclusión, realizados en personal de salud que incluyeron a enfermeras. Se establecieron tres categorías de análisis: Satisfacción e insatisfacción con la calidad de vida en el trabajo por niveles, dimensiones y dominios; Factores sociolaborales asociados a la CVT, y Calidad de vida en el trabajo y sus repercusiones en salud. Conclusión: La revisión permitió identificar aun de forma limitada que la calidad de vida en el trabajo de las enfermeras latinoamericanas mayoritariamente alcanzó niveles medio a bajo, con influencia de factores sociodemográficos y laborales, y con repercusiones en la salud de las enfermeras. Por lo tanto, es emergente profundizar en el estudio del tema, considerando que la insatisfacción con la calidad de vida en el trabajo de estas profesionales puede repercutir tanto en su propia salud como en la calidad del cuidado.
Palabras claves: Calidad de vida, trabajo, enfermera, personal de salud
The vision of foreign intervention in the USSR as planned by Russian military émigrés at the end of 1920s: The Baltic context
Authors:   Estonian Military Academy, Kopõtin Igor , Gusačenko Andrejs
Published: November 2022

As the result of the Civil War in Russia, extensive numbers of émigrés fled abroad. One of the largest groups of the refugees consisted of the soldiers of anti-Bolshevik forces, who were eager to continue the struggle against the Soviet regime. To prevent dissolution of the army and for the sake of future mobilization, a significant part of Russian military émigrés were consolidated into the Russian All-Military Union (Russkij Obshevoinskij Soyuz, ROVS), which had branches also in the Baltic states. At the end of the decade, the key figures of ROVS developed a detailed plan of intervention through the so-called “limitrophe” states, including the Baltic countries. The plan itself was recently discovered in the Bakhmeteff Archive (New York). Description of this plan in conjunction with the recent researches upon the thesis, followed by the corresponding analytical work, could raise certain interest in the context of the interwar history in the Baltics.
Estonian and Latvian naval collaboration during the interwar period of 1920–1940
Authors:   Estonian Maritime Museum, Oll Arto
Published: November 2022

After signing of the peace treaties with Soviet Russia in 1920, both Estonia and Latvia had to start developing their peacetime defense structures. Owing to both countries’ geographical positions with long coastlines, augmenting of naval forces was crucial for their maritime security. Forming a highly technical branch of the armed forces proved to be an arduous process for both nations. In recourse of the retrenchment of their defense budgets, neither country could acquire, maintain nor even complement a strong surface fleet. This inevitably created some unique naval concepts. This article examines the principles, based on which the Estonian (Eesti Merejõud) – and Latvian (Latvijas Kara flote) navies were developed, whether they concentrated on defensive or offensive naval warfare and why did a close collaboration begin between them. The naval cooperation lasted well into the early 1930s and it is interesting to observe, why this was abruptly discontinued. Although the naval alliance seemed logical on a political level, an inescapable question arises – namely, what, if any, were the actual benefits for the fleets and naval commanders themselves. This article only provides the general framework on the subject at hand along with an overview of the collaboration itself. For a better understanding of this exclusive naval collaboration, it is justifiably vital to conduct extensive research in both Estonian – and Latvian archives.
The inaugural speech of the Indonesian presidents: Analysing speech acts of Jokowi and SBY inaugural speech
Authors: Hidayat Didin Nuruddin , Septiawan Yudi , Eviyuliwati Ismalianing , Zulfikar Teuku , Permana Sudarya
Published: November 2022

Language plays a significant part in shaping and influencing people’s perspectives on societies and on political sectors, especially in an inaugural speech. Inaugural speech is one of the powerful tools to notify the people of the purposes as a leader. Hence, the researchers aimed to analyze the inaugural speeches of Susilo Bambang Yudhoyono (SBY) in 2004 and Joko Widodo (Jokowi) in 2019 regarding their rhetoric and schematic words in their speeches during their tenure served as the Indonesian President. To uncover their inaugural speeches, the researchers used the theoretical frameworks proposed by Hymes (1974, cited in Eaton, 2019), where he developed the analysis of the connection between a language and a broader feature, such as macro- and micro-linguistics analysis. However, the key purpose of concern still marks a language presenting equality between linguistic and social perspectives. The study revealed that SBY and Jokowi mostly used polite words, a low, moderate voice, and tended to appreciate their rivals when giving their inaugural speeches respectively in 2004 and 2019. The difference in macro and micro-linguistics features assert that these two national figures have different traits even though they are from the same ethnic group, the Javanese. Further, this study suggested some pedagogical implications for English teachers to implement the potential benefits of macro- and micro-linguistics analysis of inaugural speeches for the language classroom. It can bridge a gap between language teaching and practical English use in society.
Contrastive analysis of English and Indonesian adverbs
Authors: Auni Luthfi , Manan Abdul
Published: November 2022

This study focuses on contrastive analysis of the characteristics and features of adverbs in English and Indonesian languages. This study explores all similarities and differences of adverbs according to their forms, formations, meanings and positions in both languages thoroughly and accordingly predict what sorts of errors the Indonesian learners of English may encounter. This research uses descriptive method by using library research in which all data are collected from linguistics books from both languages. The findings show that there are similarities and differences almost in all aspects of adverbs in both languages. (1). Both languages have two similar forms, as origin and derivative. But in Indonesian, the original and derivative ones can be classified again into reduplication word. (2). The formations of adverbs in both languages use different affixation systems as inflection and derivation. Indonesian uses various affixes such as prefixes, suffixes and confixes, while English uses only kinds of affixes as prefix and suffix. In forming adverbs from adjectives, English uses a suffix ‘-ly’, and a prefix ‘a-‘, meanwhile most of the Indonesian adverbs have the same form as adjectives or without any addition of affixes. Referring to adverbs derived from verbs, Indonesian ones may be formed through reduplicating the base form of the verbs, while English does not have this system.  The formation of adverbs derived from nouns, English uses some suffixes such as, -ly, -ward(s), -ways, -wise, and a prefix, a-. Meanwhile Indonesian uses only one prefix ‘se-, one suffix –nya’ and by reduplicating the base form of the noun (e.g., hati becoming hati-hati), it is not in English ones. (3). In terms of their meanings, even though both English and Indonesian are alike, a great difference appears that several words called auxiliaries verbs in English and some English verbs such as, like, want, and wish, etc. have different word classes, concept and function in both languages. Those auxiliaries’ words and verbs are basically real adverbs as qualifiers in Indonesian. (4). Referring to adverb positions, generally, Indonesian adverbs are more mobile in sentences, meanwhile, English ones have certain common positions except some words should be placed permanently. These differences of adverbs in English and Indonesian are identified as problems caused by language interference for Indonesian students. Consequently, the results of this extensive research may be useful for teachers, students, curriculum development and materials of teaching.
Understanding students’ activities in Wi-Fi coffee shops in Aceh: A survey and narrative interview report
Authors: Zainuddin Zamzami , Shujahat Muhammad
Published: November 2022

This study attempts to investigate and comprehend more in-depth information about students' daily lives in the Wi-Fi coffee shops, specifically in Aceh, a province of Indonesia. The study explores how the wireless Internet in coffee shops relates to college students' activities. The surveys of 619 students were conducted as a preliminary report. An in-depth phenomenological interview was employed to collect data from three university students who regularly spent many waking hours in coffee shops. Findings from the preliminary survey revealed that more male students visited coffee shops than women, with an average time of more than three hours daily. Accessing information through the Internet was not the primary purpose of visiting the coffee shops by most students instead of gaming, meeting up with friends for a chat, and enjoying the coffee. Qualitative interviews reported that students often visited coffee shops for various purposes, including completing homework, meetings with friends, and finding freelance online market jobs. Wi-Fi coffee shops are essential for those who do not have Internet access at home, particularly young people and recent transplants with low incomes but high educational capital. Although the Internet in coffee shops can have both negative and positive effects on students, if users or students can access these facilities rightly, they will acquire many benefits to support their education and future career. However, if misused, it may negatively affect their lives. Suppose the Internet in the coffee shop is used properly for educational purposes. In that case, it will push for greener and healthier information practices for students who may favor low-tech environments or lack personal infrastructure or resources.
SYSTEMATIC LITERATURE REVIEW ON COMMUNICATION IN CONSTRUCTION PROJECT MANAGEMENT: ISSUES AMONG PROJECT PARTICIPANTS
Authors: Abd Aziz Norazlin , Mohd Rahim Faizul Azli , Aziz Nur Mardhiyah
Published: November 2022

Project communication is an important aspect that needs to be stressed in project management to ensure good project delivery in the construction industry. All the key players in construction must represent a good communication flow among themselves to avoid misunderstanding that later will affect their performance and reputation. However, there are still have issues among themselves while communicating. These communication issues are not only happening in Malaysia but in many other developing countries that are involved in the construction industry. However, there are insufficient studies on these communication issues involving project participants. Hence, the present article employs a systematic literature review to determine the issues of communication among project participants in the construction industry. The study was combined many research designs and the review was referring to ROSES (Reporting Standards for Systematic Evidence Syntheses) protocols. This research employs a systematic literature review of selected published indexed journals from Web of Science and Scopus. The findings identified several communication issues that can be categorized into different themes, which are; (1) accuracies, (2) timeliness, (3) distortions, (4) barriers, (5) under loading, (6) overloading, (7) misunderstanding, (8) gatekeeping, (9) procedures, and lastly (10) financial. Furthermore, the study also presented several significant contributions for practical purposes and a body of knowledge. The findings also described the importance of good strategies to overcome the communication issues and to look at the potential impact of those solutions on the whole progress of the projects.
Rapid Prototyping of Species Classifiers using Deep Learning
Authors: Chege Herman Njoroge
Published: November 2022

Deep learning algorithms are revolutionizing how hypothesis generation,
pattern recognition, and prediction occur in the sciences. In the life
sciences, particularly biology, and its subfields,  the use of deep
learning is slowly but steadily increasing. However, prototyping or
development of tools for practical applications remains in the domain of
experienced coders. Furthermore, many tools can be quite costly and
difficult to put together without expertise in Artificial intelligence
(AI) computing. We built a biological species classifier that leverages
existing open-source tools and libraries. We designed the corresponding
tutorial for users with basic skills in python and a small, but
well-curated image dataset. We included annotated code in form of a
Jupyter Notebook that can be adapted to any image dataset, ranging from
satellite images, animals to bacteria, or even data such as song or
echolocation recordings transformed into images. The prototype developer
is publicly available and can be adapted for citizen science as well as
other applications not envisioned in this paper.

We illustrate our approach with a case study of 219 images of 3 three
seastar species. We show that with minimal parameter tuning of the AI
pipeline we can create a classifier with 87% accuracy. We include
additional approaches to understand the misclassified images and to
curate the dataset to increase accuracy. The power of AI approaches is
becoming increasingly accessible. We can now readily build and prototype
species classifiers that can have a great impact on research that
requires species identification and other types of image analysis. Such
tools have implications for citizen science, biodiversity monitoring,
and a wide range of ecological applications.
Outpatients prescribed with fluvoxamine around the time of COVID-19 diagnosis are not at a reduced risk of unfavorable COVID-19 course compared to their non-prescribed peers: population-based matched cohort study
Authors: Trkulja Vladimir , Kodvanj Ivan
Published: November 2022

Purpose. To assess the effect of exposure to fluvoxamine around the
COVID-19 diagnosis on subsequent hospitalizations and mortality in
COVID-19 outpatients in a real-life setting. Methods. Using nationwide
administrative data, we identified adult COVID-19 outpatients diagnosed
up to August 15, 2021 and conducted two cohort studies. Study 1 included
subjects prescribed fluvoxamine around the index COVID-19 diagnosis
(Cohort A), their peers suffering similar psychiatric difficulties but
not prescribed fluvoxamine (Cohort B) and those free of psychiatric
difficulties/treatments (Cohort C). Study 2 included subjects prescribed
fluvoxamine (Cohort Fluvoxamine) and their peers prescribed paroxetine
(Cohort Paroxetine). Cohorts were mutually exactly matched and incidence
of COVID-19-related hospitalization, 30-day all-cause hospitalization
and of COVID-19-related mortality was estimated. Results. Of the 416030
first-episode outpatients, Study 1 included 1016 Cohort A, 95984 Cohort
B and 275804 Cohort C patients. Matched Cohort A (n=749) vs. Cohort B
(n=31336) relative risks (95%CI/CrI), frequentist and Bayes with
skeptical, otpimistic and pesimistic priors, were: COVID-related
hospitalization 1.37 (0.56-3.33), 1.15 (0.55-2.11), 1.03 (0.56.1.96) and
1.43 (0.63-2.94), respectively; 30-day all-cause hospitalization 1.88
(0.76-4.67), 1.76 (1.39-2.25), 1.76 (1.39-2.24) and 1.86 (1.43-2.38),
respectively; COVID-19 related mortality 0.73 (0.35-1.55), 0.93
(0.53-1.76), 0.79 (0.40-1.54) and 0.88 (0.37-2.11), respectively.
Matched Cohort A vs. C (866 vs. 222792) comparison yielded similar
estimates, as did the matched Cohort Fluvoxamine vs. Paroxetine
comparison in Study 2 (344 of 994 matched to 535 of 1796 patients).
Conslusion. Outpatients prescribed fluvoxamine around the time of
COVID-19 diagnosis were not at a reduced risk of hospitalizations and
mortality compared to their non-prescribed peers.
Pushed to the edge: Spatial sorting can slow down invasions
Authors: Shaw Allison , Lutscher Frithjof , Popovic Lea
Published: November 2022

Our ability to understand population spread dynamics is complicated by rapid evolution, which renders simple ecological models insufficient. If dispersal ability evolves, more highly-dispersive individuals may arrive at the population edge than less-dispersive individuals (spatial sorting), accelerating spread. If individuals at the low-density population edge benefit (escape competition), high dispersers have a selective advantage (spatial selection). These two processes are often described as forming a positive feedback loop; they reinforce each other, leading to faster spread. Although spatial sorting is close to universal, this form of spatial selection is not: low densities can be detrimental for organisms with Allee effects. Here, we present two conceptual models to explore the feedback loops that form between spatial sorting and spatial selection. We show that the presence of an Allee effect can reverse the positive feedback loop between spatial sorting and spatial selection, creating a negative feedback loop that slows population spread.
Schools’ anaphylaxis preparedness survey: are they equipped and ready?
Authors: Totterdell Rebecca , Gerasimidis Konstantinos , Gordon David , Raptis George
Published: November 2022

Introduction: Incidence of anaphylaxis has increased threefold
in the last 20 years, with 17% of preventable fatalities occurring in
UK schools. The aim of this study was to measure schools’ anaphylaxis
preparedness across the West of Scotland.     Methods: A survey
was distributed to primary and secondary schools between January-June
2020. The objective and subjective preparedness levels were assessed by
analysing item responses that reflected schools’ adherence to
National/European guidelines, as well as their perception of
preparedness. A scoring system was applied to classify schools as
‘equipped & ready’, ‘transitional’, ‘improvements required’ or
‘unprepared’.   Results: 155 schools responded, of which 72%
(n=112) had pupils registered with severe allergies, issued with an
adrenaline auto injector (AAI). 27% (n=44) had personalised allergy
action plans in place, less than half of applicable schools (n=112)
stored AAIs accessibly (n=54, 47%), and just 38% had canteen allergen
labelling (n=59). 16% of schools had an allergy management policy (AMP,
n=25), and previous experience managing anaphylaxis was associated with
AMP implementation (p=0.009).  Schools rated their perceived
preparedness highly, however only 5% (n=8) were categorized as
‘equipped & ready’ (score >75%) with a mean preparedness
score across schools of 50%. Schools supported a need for a
standardised national AMP and further training (n=151, 93%).   
Conclusion: The results demonstrate a low level of schools’
anaphylaxis preparedness across the region, where experience may promote
preparedness over available guidance. Statutory training may be required
to support the implementation of an AMP and raise allergy awareness.
Modulation Instability analysis and Nonlinearity management of optical solitons with the influence of generalized external potentials
Authors: Rajan Murugan Senthil Mani , Veni S. Saravana
Published: November 2022

A nonlinear Schrödinger equation with the combined effects of variable
nonlinearity and generalized external potentials is investigated. Three
soliton solutions are generated by means of Darboux method through
constructed Lax pair. We attained two constraints related to gain or
loss function for considered equation via compatibility condition. Using
three soliton solutions, influences of the inhomogeneous nonlinearity
and harmonic potential on soliton structures are analysed by properly
tailoring the loss or gain parameter. Specifically, via inelastic
collision among three solitons, soliton switching characteristics is
observed. Additionally, we explore the Modulation instability (MI)
through linear stability analysis (LSA) and impact of nonlinearity
profile is examined. The trigonometric, exponential and constant values
have been chosen for loss or gain parameter to study the effect on the
MI gain spectrum.
The importance of biotic interactions in distribution models depends on the type of ecological relations, spatial scale and range.
Authors: Moens Merijn , Biesmeijer Jacobus , Huang Elaine , Vereecken Nicolas , Marshall Leon
Published: November 2022

Classical Species Distribution Models are primarily based on climate,
land use and other abiotic variables. Despite recent studies showing
that biotic information can play an important role in shaping the
distribution of species even at large scales, results are not always
consistent among studies and the underlying factors that influence the
importance of this biotic information to the models, are unclear. To
address this knowledge gap, we evaluated how different factors affect
the importance of biotic interactions in shaping species distributions,
using fine-scale data from plant-pollinator and parasitic interactions
in the Netherlands. We found that the models of wild bees improved, when
their biotic interaction was included, and the model performance
improved the most for parasitic bees. Taxonomic level, resolution and
distribution range of the interacting species and degree of
specialization of the modelled species all affected the importance of
the biotic interactions to the models.
Patterned light stimulation, does it affect neuronal activity?
Authors: Kuczewski Nicola , Lightning Anistasha , Beurrier Corinne , Bourzeix Marie
Published: November 2022

Neuronal sensitivity to light stimulation can be a significant
confounding factor for assays that use light to study neuronal
processes, such as optogenetics and fluorescent imaging. While
continuous light stimulation has been shown to be responsible for a
decrease in firing activity in several neuronal subtypes, discontinuous
light stimulation commonly used in optogenetic experiments is supposed
to have a negligible action. In the present report, we experimentally
test this theoretical prediction by evaluating the effect produced by
ten of the most commonly used patterns of discontinuous light
stimulation under several electrophysiological parameters.
Intergenerational Arsenic Exposure on the Mouse Epigenome and Metabolic Physiology
Authors: Colwell Mathia , Wanner Nicole , Rezabek Amanda , Faulk Christopher
Published: November 2022

Inorganic Arsenic (iAs) is one of the largest toxic exposures to impact
humanity worldwide. Exposure to iAs during pregnancy may disrupt the
proper remodeling of the epigenome of F1 developing offspring and
potentially their F2 grand-offspring via disruption of fetal primordial
germ cells (PGCs). There is a limited understanding between the
correlation of disease phenotype and methylation profile within
offspring of both generations and whether it persists to adulthood. Our
study aims to understand the intergenerational effects of in utero iAs
exposure on the epigenetic profile and onset of disease phenotypes
within F1 and F2 adult offspring, despite the life-long absence of
direct arsenic exposure within these generations. We exposed F0 female
mice (C57BL6/J) to the following doses of iAs in drinking water 2 weeks
before pregnancy until the birth of the F1 offspring: 1 ppb, 10 ppb, 245
ppb, and 2300 ppb. We found sex- and dose-specific changes in weight and
body composition that persist from early time to adulthood within both
generations. Fasting blood glucose challenge suggests iAs exposure
causes dysregulation of glucose metabolism, revealing generational,
exposure, and sex specific differences. Toward understanding the
mechanism, genome-wide DNA methylation data highlights exposure-specific
patterns in liver, finding dysregulation within genes associated with
cancer, T2D, and obesity. We also identified regions containing
persistently differentially methylated CpG sites between F1 and F2
generations. Our results indicate F1 developing embryos and F2 PGCs
retain epigenetic damage established during the prenatal period and are
associated with adult metabolic dysfunction.
The local feast “Young wine festival” as a marketing, tourist and cultural event
Authors:   Agricultural University-Plovdiv, Bulgaria, Videv Stefan , Yoncheva Tanya ,   Agricultural University-Plovdiv, Bulgaria
Published: November 2022

Abstract The current article focuses on the local feast "Young Wine Festival”. An attempt has been made to position the festival in comparison to other festival events as well as to wine events and tours held in our country. Based on this, its marketing, tourist and cultural-entertainment functions and the specific mix of interrelated participants are presented. In conclusion, some summaries and recommendations to the organizers have been drawn up.
Influence of combined fertilization on morphological and productive qualities of cabbage and broccoli
Authors:   Maritsa Vegetable Crops Research Institute, Plovdiv, Dintcheva Tsvetanka , Valcheva Iliana ,   Agricultural Academy, Sofia, Bulgaria, Antonova Galina ,   Biodinamica LTD, Plovdiv, Bulgaria
Published: November 2022

The trails were conducted in the experimental field of the Maritsa Vegetable Crops Research Institute (MVCRI), Plovdiv with head cabbage variety Bilyan and broccoli variety Marathon F1. The crops were grown according to the scheme 100+60/60cm (2083 plants/da). Two variants have been studied in the experiment: optimal mineral fertilization - 50kg/da phosphate fertilizer, 40kg/da potassium fertilizer and 30kg/da nitrogen fertilizer (control) and combined fertilization with Stimak P - organic soil fertilizer (0,500-1,5kg/da), Stimak - foliar fertilizer (200ml/da) and Simargal - microbial fertilizer (0,5 ml/plant).Cole crops grown for late field production with drip irrigation technology were found to respond positively to combined fertilization with microorganisms and organic fertilizers through the drip system and foliar fertilizer together with the treatment of plants with plant protection products. As a result of combined fertilization the yield, in comparison to the optimal mineral fertilization, was increase with 31,01% and 46,85% Bilyan and Marathon F1 varieties of cabbage and broccoli, respectively.
Entrepreneurship Development Process in Korea: Theory and Practice
Authors:   Academy of Entrepreneurship, Bae Zong-Tae
Published: November 2022

This study deals with the characteristics and development process of entrepreneurship in Korea and how the aspects and phenomena of entrepreneurship have changed according to the spirit of the times. This study consists of three parts: the definition and understanding of Korean entrepreneurship, the development process of Korean entrepreneurship, and the nature of K-Entrepreneurship.
First, in connection with Korea's economic and social development process and the spirit of the times, this study defines entrepreneurship as “① an entrepreneur’s challenging mindset, competence, and action, ② identifying new opportunities, and ③ creating and sharing value through innovation, cooperation, resources and risk management, in the context of the spirit of the age. Three key elements of entrepreneurship were derived: ① opportunity, ② challenge, and ③ innovation/value creation.
Second, the development process of entrepreneurship in Korea was analyzed. Following the embryonic period of entrepreneurship (the 1920s-1950s), when entrepreneurship was not yet fully realized, entrepreneurship in Korea has developed along three stages: ① the first generation (1960s-1980s), ② the second generation (1990s-2000s) and ③ the third generation of entrepreneurship (since 2010s). Representative entrepreneurs for each age were analyzed, and the characteristics of business opportunities were also examined.
Third, this study explored the prototype and characteristics of Korean entrepreneurship (K-Entrepreneurship) based on the development process of entrepreneurship in Korea and the attributes of entrepreneurs' activities. In particular, four key elements of Korean entrepreneurship - ① dynamic development reflecting the spirit of the times, ② rapid innovation and execution, ③ strong government policy support, and ④ existence of excellent entrepreneurs and smart people. The findings of this study will contribute to understanding the characteristics of Korean entrepreneurship and seeking the development direction of Korean entrepreneurship.
Combined natural-convection and radiation in presence of internal heat generation source in absorbing-emitting-scattering medium
Authors: Rachedi Nesrine , Guellal Messaoud , Bouafia Madiha
Published: November 2022

Numerical investigation of combined laminar natural convection and volumetric
radiation with internal heat generation is presented in this paper and
computations are performed for a grey gas-filled square cavity whose
horizontal walls are adiabatic and vertical walls are differentially heated.
The convection is treated under Boussinesq approximation by an approach
based on finite-volumes and the volumetric radiation by the discrete
ordinates method. Flow and heat transfer characteristics through isotherms,
streamlines and average Nusselt numbers have been presented for an external
Rayleigh number 106, internal Rayleigh number 0 to 4x1012, optical thickness 0 to
10 and Albedo 0 to 1. Representative results illustrating the effects of the
optical thickness and the internal heat generation on the flow and the
temperature distribution within the cavity are presented. The results reveal
that the fluid flow and heat transfer are influenced significantly by the
volumetric radiation and the internal heat generation. By comparing the
solutions in pure convection, the results in combined convection-volumetric
radiation show that when the medium is participating, the effect of internal
source presence is very important.
Experimental study of convective heat transfer in Fe3O4-H2O nanofluids in a grid-shaped micro-channel under magnetic field
Authors: Li Chunquan , Liu Zhengwei , Huang Hongyan , Shang Yuling , Li Xuebin
Published: November 2022

Experimental study of convective heat transfer with Fe3O4-H2O (1 vol%) nanofluids was examined when the nanofluids flowed through a gridded micro-channel under a perpendicularly oriented magnetic field of 0-700 G strength. The results show that, compared to deionized water, nanofluids reduces chip temperature by 2.11?C and increases the convective heat transfer coefficient by 30.43% when no magnetic field is present. Under magnetic field conditions, the chip temperature was maximally reduced by 3.2?C, while the convective heat transfer coefficient is improved up to 65% in comparison to deionized water. With increasing magnetic field strength, nanofluids pressure drop and flow resistance showed an overall decreasing trend, and the pressure drop at 500 G and 700 G were reduced by 19.3% and 14.51%, respectively, compared to that at 0 G. In terms of overall performance, improved heat transfer in the presence of a magnetic field outper-forms heat transfer in the absence of a magnetic field. The intensive heat transfer factor of nanofluids under magnetic field conditions is greater than one when the Reynolds number exceeds 400. The best overall performance and the highest intensive heat transfer factor are observed at a magnetic field strength of 300 G.
Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure
Authors: Veljic Darko , Radovic Nenad , Rakin Marko , Sedmak Aleksandar , Medjo Bojan , Mrdak Mihailo , Bajic Darko
Published: November 2022

This paper deals with analysis and comparison of the equivalent plastic strain and temperature fields in the aluminium alloy 2024 T3 (AA2024 T3) joint, with macro/microstructure appearance and hardness profile. In the alloys hardened by heat treatment, grain size and particle size of the precipitate are functions of equivalent plastic strain, strain rate and temperature. By analysing the equivalent plastic strain fields and temperature fields it is possible, to some extent, to capture the effect of welding parameters and thermo-mechanical conditions on grain structure, and therefore hardness and strength in the welded joint. A coupled thermo-mechanical model is applied to study the material behaviour during the linear welding stage of friction stir welding. The 3-D finite element model has been created in ABAQUS/EXPLICIT software using the Johnson-Cook material law. The values of thermo-mechanical quantities during the welding stage are obtained from the numerical model and shown as distributions across the joint. The obtained values of these quantities are related to the microstructure of the joint zones and hardness distribution, and this relation is discussed.
Thermodynamic analysis of exhaust heat recovery of marine ice using organic rankine cycle
Authors: Wang Shucheng , Chen Xinna , Li Hongwei , Fu Zhongguang , Han Zhicheng
Published: November 2022

The use of organic Rankine cycle power systems for waste heat recovery on marine internal combustion engines can help to mitigate the GHG and reduce the fuel consumption of the marine engine. In this paper, the internal combustion engine combined with an organic Rankine cycle system was developed to analyze the performance of waste heat recovery from the exhaust gas of a heavy-duty marine Diesel engine via five selected working fluids with low global warming potential and ozone depletion potential. The net output power and thermal efficiency for each of the selected working fluids were obtained. Results indicate that the working fluids of butane have the best performance among the selected working fluids with the power efficiency of the organic Rankine cycle subsystem of 12.27% under the power load of 100%. For the overall proposed system, the maximum net power output is 1048 kW and the power efficiency is 36.47%. Besides, the total thermal efficiency of the proposed system was 67.94% when considering the recovered waste energy from jacket water.
Solution method of multiphase seepage sequence in heavy oil reservoir by steam injection considering numerical oscillation
Authors: Kang Yuanyuan , Lv Jianguo
Published: November 2022

In order to improve the dynamic control ability of multiphase flow in heavy oil reservoir by steam injection, he put forward the sequential solution method of multiphase flow in heavy oil reservoir by steam injection based on numerical oscillation, established saturation equation and dynamic equation of multiphase flow in heavy oil reservoir by steam injection, solved the output pressure of multiphase flow in heavy oil reservoir by pressure equation based on volume conservation, and established the sequential solution model of all-component model of multi-phase flow in heavy oil reservoir by steam injection. The output pressure of multiphase seepage in steam injection-production heavy oil reservoir is transformed into parabolic variable, and the saturation and composition are hyperbolic variable models. Through the analysis method of saturation and composition characteristics of all-component model, combined with the pressure signal analysis of numerical oscillation, empirical mode decomposition and spectrum analysis methods are adopted to realize the velocity parameter analysis and multiphase seepage sequence analysis of steam injection-production heavy oil reservoir, and the numerical oscillation analysis and parameter estimation of multiphase seepage in steam injection-production heavy oil reservoir are realized by establishing the sequential solution algorithm of steam injection-production heavy oil reservoir. The simulation results show that this method is used to solve the multiphase seepage sequence of heavy oil reservoir by steam injection, and the parameter estimation accuracy is high, which improves the calculation efficiency of numerical simulation of steam injection and production. The calculation efficiency and accuracy of this algorithm in 2-D and 3-D examples with gravity are verified by examples.
On maximum likelihood estimates of a proportional hazard rate model parameters based on record values
Authors: Vidovic Zoran
Published: November 2022

The proportional hazard rate models have wide acceptance in modeling complex data from different engineering, reliability, and survival applications. The hazard rate function of such models is able to model data with a monotonic or a bathtub-shape hazard rate. In this paper, we propose a subclass of proportional hazard rate models with three-parameters for which we have proved the existence and uniqueness of the maximum likelihood estimators based on upper kth record values. The proposed inference is found especially useful in some real illustrations within mechanical and medical analysis. Finally, several remarks are presented in the final stage of this paper.
Reduction of evaporation losses in oil and oil derivatives storage tanks: A case study for warehouse in Pozega, Serbia
Authors: Batic Iva
Published: November 2022

One of the biggest problems related to mandatory tanks of oil and oil derivatives are evaporative losses in the tanks. It is well known that the storage, manipulation, and transport of oil and oil derivatives results in the evaporation of the liquid. In the case of tanks where commodity reserves are stored for a long period of time, the most pronounced problems are ?breathing? losses and degradation of the quality of petroleum products. Many of these volatile organic compounds also have a strong negative impact that is harmful to human health and the environment. The aim of this research is to improve system in order to reduce evaporative losses in the tanks which are used for mandatory reserves of oil and oil derivative in warehouse in location near Pozega in Serbia as well as to reduce the harmful impact on the environment with the proposed improvement measures.