bluuebunny/crossref_metadata_2025 huggingface dataset:
Pheochromocytoma With Adrenergic Biochemical Phenotype Shows Decreased GLP-1 Secretion and Impaired Glucose Tolerance
Authors: Petrák Ondřej , Klímová Judita , Mráz Miloš , Haluzíková Denisa , Doležalová Radka Petráková , Kratochvílová Helena , Lacinová Zdeňka , Novák Květoslav , Michalský David , Waldauf Petr , Holaj Robert , Widimský Jiří , Zelinka Tomáš , Haluzík Martin
Published: March 2020

Context

Impaired glucose homeostasis is a common finding in pheochromocytoma (PHEO), especially with adrenergic phenotype. The possible contribution of incretin dysfunction to dysglycemia in PHEO patients has not been studied.

Objective

To compare changes in pancreatic endocrine function and gut hormones’ production during a liquid meal test before and 1 year after adrenalectomy.

Methods

In a prospective study, we included 18 patients with PHEO (13 females) with adrenergic biochemical phenotype. A liquid meal test with predefined isocaloric enteral nutrition was performed to evaluate dynamic changes in pancreatic hormones and incretins.

Results

During the meal test, insulin levels were significantly lower before adrenalectomy only in the early phase of insulin secretion, but changes in area under the curve (AUC) did not reach statistical significance (AUC = 0.07). Plasma glucagon (AUC < 0.01) and pancreatic polypeptide levels (AUC < 0.01) were suppressed in comparison with the postoperative state. Impaired response to the meal was found preoperatively for glucagon-like peptide-1 (GLP-1; AUC P < 0.05), but not glucose-dependent insulinotropic polypepide (GIP; AUC P = 0.21). No significant changes in insulin resistance indices were found, except for the homeostatic model assessment-beta index, an indicator of the function of islet β cells, which negatively correlated with plasma metanephrine (R = –0.66, P < 0.01).

Conclusions

Our study shows suppression of pancreatic α and β cell function and impaired GLP-1 secretion during a dynamic meal test in patients with PHEO, which is improved after its surgical treatment. These data demonstrate a novel and potentially significant interconnection between excessive catecholamine production and the secretion of glucoregulatory hormones.
Last dalians (stationary uncovered pound nets) deployed in the Istanbul Strait: Catch composition, catch per unit effort, and ecological indexes
Authors: BİÇER Dorukhan , YILDIZ Taner , UZER Uğur , KARAKULAK F. Saadet
Published: March 2020

This paper updates some information on fish catches from the last dalians (stationary uncovered pound nets) operating off the coast of Istanbul Strait. The data were collected on the weekly basis directly from the owners of the traps. Although the traps have been targeting migratory pelagic fishes during their migration, demersal species have been caught as well. Totally, 15 fish species belonging to 12 families were caught during the study period. While the number of fishing days ranged from 24 to 37, the catch per unit effort ranged from 163.08 kg/day to 456.39 kg/day. As a conclusion, this study provides recent reference for the future studies dealing with monitoring and managing dalian fishery.
Some interactions between coastal fisheries and sea birds in the Aegean Sea
Authors: CEYHAN Tevfik , AKYOL Okan
Published: March 2020

In this study, it is aimed to determine the some interactions between various fishery types and seabirds, results of this interaction and sea bird species that have been interacting due to secondary attraction factors. A total of 80 fishermen, working in fish farms, small scale fishery (SSF) and lagoons located in Izmir, Aydın and Muğla were face-to-face interviewed between September 2016 and December 2018. The great cormorant (Phalacrocorax carbo), yellow-legged gull (Larus michahellis), great white egret (Ardea alba), some yelkouan shearwater (Puffinus yelkouan) and great white pelican (Pelecanus onocrotalus) are the bird species that have an interaction with coastal fishermen and sea-cage fish farms. 82% of employees in sea-cage fish farms mentioned that they have an interaction with sea birds in winter, besides %50 of SSF have an interaction with sea birds in summer. The difference between interaction rate according to seasons has been found as statistically significant (p<0.05). 33% of employees in fish farms expressed that they see sea birds during the day. This ratio is 21.7% and 15% for SSF and fishermen in lagoon, respectively. Furthermore, 8.3% of fishermen in lagoon, 11% of employees in fish farms and SSF mentioned that they have an interaction with seabirds especially in the morning time.
Sponge species from ports of the inner and middle parts of İzmir Bay (Aegean Sea, Eastern Mediterranean)
Authors: EVCEN Alper , ÇINAR Melih Ertan
Published: March 2020

Four sponge species (Sycon raphanus, Sycon ciliatum, Paraleucilla magna and Dysidea fragilis) were found on artificial hard substrata of several ports in the inner and middle parts of Izmir Bay. The invasive alien species Paraleucilla magna, is being recorded for the first time from the Aegean coast of Turkey. It was very abundant almost at all studied ports, covering up to 35% of the sampled surfaces. The morphological and distributional features of the four species are described.
Antibacterial activity of some essential oils againts Vagococcus salmoninarum
Authors: METİN Seçil , BİÇER Zühre İşıl
Published: March 2020

In this study, essential oils of thyme (Origanum vulgare), St. John's Wort (Hypericum perforatum), rosemary (Rosmarinus officinalis), ginger (Zingiber officinale), clove (Eugenia caryophyllata), peppermint (Menta piperita), lavandula (Lavandula hybrida) and black cumin (Nigella sativa) were screened for its chemical composition and in vitro antibacterial activity against Vagococcus salmoninarum. The composition of oils were analysed using GC/MS. Antibacterial effects of essential oils against V. salmoninarum were detected by agar diffusion and tube dilution assays. Thyme (125 μL ml-1 MIC) and clove (500 μL ml-1 MIC) essential oils were shown to possess strong antibacterial activity against V. salmoninarum. The main components of effective essential oils were carvacrol (63.57 %) and eugenol (85.99%), respectively. As a result, these two plant species that tested against V. salmoninarum which is causative agent of vagococcosis can be used as an antibacterial agent. For this purpose, in vivo antibacterial activities against vagococcosis of thyme and clove essential oils should be explored in the further studies.
Investigation of changes in paraoxonase and arylesterase enzyme activities in scaly carp (Cyprinus carpio) applied oxytetracycline by bath
Authors: MİŞE YONAR Serpil , AKER Ufuk
Published: March 2020

In this study, it was aimed to reveal the effects on paraoxonase (PON) and arylesterase (ARE) enzyme activities of oxytetracycline applied in different concentrations in scaly carp (Cyprinus carpio). For this purpose, oxytetracycline at doses of 50 and 75 mg/L was applied by bathing for 48 hours. On the 7th, 14th and 21st days after the application of oxytetracycline, liver and serum samples were taken from the fish in the control and experimental groups. Changes in the PON and ARE enzyme activities were determined in the liver and serum samples which collected from the fish.

The PON and ARE activities in the liver and serum decreased in the groups exposed to oxytetracycline compared to that of the control group. This reduction was statistically different from the control group on 7, 14 and 21 days.
Paraonis fulgens (Annelida: Paraonidae), a new record for the marine fauna of Turkey
Authors: ERDOĞAN DERELİ Deniz , ÇINAR Melih Ertan
Published: March 2020

This paper deals with the occurrence of Paraonis fulgens on the coast of Turkey. Three specimens of this species were found at 4 m on sandy mud bottom in İskenderun Bay, north-east Levantine Sea. The morphological and distributional features of the species were explained. The present study described a ventral lobe on chaetigers in the family Paraonidae for the first time.
Effects of depth and season on catch volume of bottom gillnets employed along the Fatsa coasts of the South-eastern Black Sea
Authors: BALIK İsmet
Published: March 2020

The study was conducted along the Fatsa coasts of the South-eastern Black Sea, to investigate the effects of depth and season on catch volume of the bottom gillnet fishery. During the study, fishing was carried out using multifilament gillnets with mesh sizes of 32, 34, 36 and 38 mm in each of the four different depth strata (0-14 m, 15-29 m, 30-49 m and ≥50 m) three times per month between March 2013 and February 2014 (except for July and August), with a total of 30 gillnet hauls performed. The results of the study revealed that in all seasons whiting (Merlangius merlangus) was caught most in the 30 m and deeper water layers. However, whiting catch increased with increasing water depth. Most red mullets (Mullus barbatus) were caught in the 0-14 m depth waters during spring, winter and autumn periods, while its catch was the greatest in the 15-29 m during the summer period. Catch of this species decreased gradually with increasing water depth. Another fish species was pontic shad (Alosa immaculata) which was caught least in the shallow waters. However, during all seasons its catch increased gradually with increasing water depth up to the 30-49 m depth strata. Nevertheless, it was determined that catch volume for this species decreased in the ≥50 m level again. On the other hand, Mediterranean horse mackerel (Trachurus mediterraneus) was mostly caught in the shallow waters (0-14 m and 15-29 m) during all seasons. Especially in the ≥50 m waters, no Mediterranean horse mackerel was sampled during the study. This study presents that amounts of catch for the fish species sampled were affected especially by water depth and seasons.
Effects of myo-inositol concentration on growth and pigments of Nannochloropsis oculata culture
Authors: DURMAZ Yaşar , ERBİL Gökhun Çağatay
Published: March 2020

Inositols are used as growth promoting agents over plants. But microalgae are different from higher plant especially photosynthetic efficiency and productivity. According to the results of this study, myo-inositol addition to the culture medium of Nannochloropsis oculata provides higher cell densities. 100 mg L-1 myo-inositol added experimental group was reached to 1.42 fold cell mL-1, while the 500 mg L-1 myo-inositol added group was reached to 1.28 fold cell mL-1 than the control group. Mean chlorophyll a per cell amounts were calculated for experimental groups and control groups as 0.052 pg cell-1 and 0.053 pg cell-1, respectively. Mean total carotene per cell amounts were calculated for all groups as 0.016 pg cell-1. These results show that no difference was occurred between all groups by chlorophyll a and total carotene amounts per cell. This study shows that myo-inositol use in microalgae production may provide higher yields.
Oppositional Logics and the Antecedents of Hybridization: A Country-Level Study of the Diffusion of Islamic Banking Windows, 1975–2017
Authors: Boone Christophe , Özcan Serden
Published: April 2020

Little is known about when and where hybrid organizations diffuse. We argue that neo-institutional perspectives, which stress the constraining role of market categories and institutional logics, have to be complemented with demand-side perspectives that stress the enabling force of economic incentives to explain the origins of hybrids. We develop theory to predict the country-level diffusion of hybrid forms in Islamic banking in the 1975–2017 period, during which many conventional banks invaded the domain of Islamic banking by starting to sell Islamic banking services, or so-called “Islamic windows.” Our findings underscore the relevance of simultaneously studying the impact of constraining and enabling forces. Consistent with neo-institutional theory, we find strong evidence that a lack of constitutive legitimacy of the window form—only in countries where Muslims make up a large share of the population—and the ideological polarization of local audiences reify the ideological boundaries between the oppositional banking logics, which in turn hampers the diffusion of windows in the focal country. At the same time, however, it appears that the failure of local credit markets and country-level economic globalization, the latter even more in countries with a Muslim majority, provide potent economic incentives for the diffusion of windows. By stressing the role of utilitarian incentives and material exchange as drivers of hybridization, we bridge the gap between neo-institutional and more rationalist approaches of institutional change.
The role of cardiopulmonary exercise testing and echocardiography prior to elective endovascular aneurysm repair
Authors: Straw S , Waduud MA , Drozd M , Warman P , Bailey MA , Hammond CJ , Abdel-Rahman SED , Witte KK , Scott DJA
Published: April 2020

Introduction

Cardiopulmonary exercise testing (CPET) and transthoracic echocardiography (TTE) are common preparative investigations prior to elective endovascular aneurysm repair (EVAR). Whether these investigations can predict survival following EVAR and contribute to shared decision making is unknown.

Methods

Patients who underwent EVAR at a tertiary centre between June 2007 and December 2014 were identified from the National Vascular Registry. Variables obtained from preoperative investigations were assessed for their association with survival at three years. Regression analysis was used to determine variables that independently predicted survival at three years.

Results

A total of 199 patients underwent EVAR during the study period. Of these, 120 had preoperative CPET and 123 had TTE. Lower forced expiratory ventilation (FEV1), ratio of FEV1 to forced vital capacity, work at peak oxygen consumption and higher ventilatory equivalent for carbon dioxide were associated with increased mortality. Variables obtained from TTE were not associated with survival at three years although there was a low incidence of left ventricular systolic dysfunction and significant valvular disease in this cohort.

Conclusions

CPET might be a useful adjunct to assist in shared decision making in patients undergoing elective EVAR and may influence anaesthetic technique. TTE does not appear to be able to discriminate between high and low risk individuals. However, a low rate of significant ventricular dysfunction and valvular disease in patients undergoing elective EVAR may account for these findings.
Depth-resolved NIR-II fluorescence mesoscope
Authors: Liao Jiuling , Yin Yixuan , Yu Jia , Zhang Rongli , Wu Ting , Li Hui , Sun Qinchao , Zhang Labao , Zheng Wei
Published: March 2020

NIR-II fluorescence imaging is a promising method for visualizing biological structures in deep tissue, owing to the advantages of significantly suppressed optical scattering and diminished autofluorescence in biological tissues. However, few NIR-II fluorescence imaging approaches can simultaneously achieve a large field of view, high resolution and superior penetration depth, while exhibiting optical sectioning capability. In this paper, we present a novel NIR-II fluorescence mesoscopy system based on the f-θ scanning scheme and confocal detection to overcome these limitations. When used with NIR-II fluorescent dyes, our setup performs NIR-II fluorescence imaging on samples as large as 7.5×7.5 mm2 with a lateral resolution of 6.3 µm. In addition, our system provides a depth-resolved imaging ability and zooming function. We successfully demonstrate in vivo cerebrovascular imaging of a mouse with local ischemia. Thus, our system provides new opportunities to explore the mechanism of cerebrovascular disease.
Ultra-broadband high conversion efficiency optical parametric chirped-pulse amplification based on YCOB crystals
Authors: Yang Shunhua , Liang Xiao , Xie Xinglong , Yang Qingwei , Tu Xiaoniu , Zheng Yanqing , Zhang Xiaoqi , Zhang Yan , Guo Ailin , Zhu Ping , Kang Jun , Sun Meizhi , Zhu Jianqiang
Published: March 2020

We present a high efficiency and ultra-broadband optical parametric chirped-pulse amplification (OPCPA) system fully based on yttrium calcium oxyborate (YCOB) crystals. The OPCPA properties of YCOB at 808 nm are studied for both high gain and saturated amplification. The non-collinear angle is finely tuned to study the variation of gain spectrum at a certain phase-matching angle of YCOB crystals. After amplification by four YCOB crystals, a total signal gain of 0.9×109 is obtained and the FWHM spectral bandwidth is still over 100 nm. An amplified signal pulse of 182 mJ is achieved with pump energy of 440 mJ in the saturated amplification stage and the conversion efficiency is about 40%. After a four-grating compressor, a pulse duration of 20 fs is measured by a second-order autocorrelator.
EDF ring laser using cascaded-chirped long period fiber grating for temperature measurement
Authors: Fukushima Koken , Bui Quoc Hung , Nakaya Koki , Soares Manuel Guterres , Wada Atsushi , Tanaka Satoshi , Ito Fumihiko
Published: March 2020

A novel tunable erbium-doped fiber ring laser (EDFRL) using a cascaded-chirped long period fiber grating (C-CLPG) as a wavelength selection element is proposed. The oscillation wavelength is determined by the one of the spectral peaks of the C-CLPG used, and the oscillation output provides a high signal to noise (S/N) ratio detection and a highly sensitive measurement of the temperature due to its high power and narrow spectral output. In the experiment, it is confirmed that the wavelength of the output shifts in accordance with the temperature-induced spectral shift of the C-CLPG transmittance spectrum and the temperature sensitivity is obtained to be ∼-0.2 nm/°C within the wavelength range of 1567.30 ∼ 1575.78 nm. The oscillation wavelength range is to be limited depending on the fringe spacing of the channeled spectrum of C-CLPG, which limits the temperature measurement range, but a data processing approach to solve this problem is additionally proposed and its availability is also presented.
Nonimaging metaoptics
Authors: Moreno Ivan , Avendaño-Alejo Maximino , Castañeda-Almanza C. P.
Published: April 2020

So far, metalenses have only been studied in imaging optics, where a point from the object space is mapped to a corresponding point in the image space. Here we explore metalenses and metamirrors for dealing with the optimal transfer of light energy. Owing to its compactness and high design flexibility, metasurface-based flat optics may open new opportunities in the nonimaging field, which deals with light concentration and illumination. The building blocks of metalenses are subwavelength-spaced scatterers. By suitably adjusting their shape, size, position, and orientation, one can control the light spatial distribution, as is desired in nonimaging problems. In this Letter, we introduce nonimaging metaoptics, review its basics, and briefly explore three cases: the compound-metasurface concentrator [analogous to the compound parabolic concentrator (CPC)], the total internal reflection (TIR) metalens (analogous to the TIR lens), and a simple condensing metalens.
Effect of KOROPASS, an extruded jack bean (Canavalia ensiformis)-derived supplement, on productivity and economic performance of beef cattle
Authors: Prasetiyono Bambang Waluyo Hadi Eko , Subrata Agung , Widiyanto Widiyanto
Published: March 2020

Aim: This study evaluated the effect of feeding a graded amount of extruded jack bean (Canavalia ensiformis) on nutritional status, production performances, and economic performance of beef cattle.

Materials and Methods: The supplement called "KOROPASS" was prepared from the extruded jack bean (according to the extrusion heating process). Sixteen male Friesian-Holstein crossbred cattle were divided into four groups and fed on KOROPASS as per the regimen: R0 (total mixed ration [TMR] without KOROPASS), R1 (TMR supplemented with 3% KOROPASS), R2 (TMR supplemented with 6% KOROPASS), and R3 (TMR supplemented with 9% KOROPASS). The in vivo experiment lasted 44 days. TMR contained 12% crude protein and 60% total digestible nutrient. The consumption and digestibility of dry matter (DM), organic matter (OM), and total protein (TP), feed efficiency, average daily gain, and income over feed cost (IOFC) were evaluated.

Results: KOROPASS supplementation significantly increased (p<0.05) beef cattle consumption of DM (from 7.83 [R0] to 8.33 [R1], 8.91 [R2], and 9.69 kg/day [R3]), OM (from 6.72 to 7.17, 7.69, and 8.38 kg/day, respectively), and TP (from 892 to 1020, 1182, and 1406 g/day, respectively). The elevated levels of KOROPASS significantly increased (p<0.05) digestibility in terms of the levels of DM (from 42.9 [R0] to 50.6 [R1], 58.0 [R2], and 63.6% [R3]), OM (from 54.3 to 59.6, 66.3, and 70.6%, respectively), and TP (from 65.0 to 67.1, 75.0, and 80.7%, respectively). Dietary supplementation of KOROPASS significantly increased (p<0.05) metabolizable protein, average daily weight gain, and feed efficiency of beef cattle. Finally, dietary KOROPASS supplementation, especially at 9%, resulted in the highest (p<0.05) IOFC value of beef cattle.

Conclusion: Dietary supplementation of KOROPASS improved feed utility, as reflected by the increase in consumption and digestibility of DM, OM, and TP. Further, KOROPASS supplementation improved feed efficiency, growth, and economic performance of beef cattle. The findings indicate the potential value of KOROPASS as a feed supplement for beef cattle.
Supply side fantasies and precarious part-time academic labor
Authors: Jacoby Daniel , Boyette Jonathan
Published: March 2020

Reliance upon part-time instructors within U. S. post-secondary institutions has received a great deal of attention, particularly as the percentage of such faculty has become the largest single category of faculty in academia. Understanding how part-time markets operate may allow better policy. Most current studies on the subject examine national markets, and emphasize demand factors motivating expansion of the part-time workforce. Although the subject of supply was once critical to discussions it has received less attention of late in part due to a faulty understanding of how part-time markets operate. Cross sectional regression analysis is performed to explore potential correlations between the number of graduating masters and doctoral students and reliance upon part-time faculty at neighboring institutions of higher education. Where previous researchers have found that institutions in more urbanized settings exhibit greater reliance upon part-time faculty, this analysis indicates that local availability of recently minted masters and PhD degrees within commuting distances of the hiring institution more closely fits staffing data. Policy actors may be able to use these results to better coordinate regional or local demand to supply, which has implications for unions and other policy actors attempting to limit reliance upon part-time faculty.
El devenir del sistema universitario público en la Argentina a través de sus olas expansivas: Diferenciación en la formación de fuerza de trabajo y acumulación de capital (1971-2015)
Authors: Mendonca Mariana , Pérez Trento Nicolás Sebastián
Published: March 2020

A lo largo de las últimas cinco décadas, el sistema universitario atravesó tres intentos de reforma destinados a mejorar su performance y transformar algunas de sus características. Sin embargo, si bien estos procesos resultaron en una expansión cuantitativa del número de instituciones, no lograron cambios cualitativos de conjunto. En este trabajo, procuraremos analizar el contenido de estos procesos en relación con el carácter específico de la acumulación de capital en la Argentina. Nuestra hipótesis consiste en que, por una parte, el proceso de acumulación de capital requiere que sólo una pequeña fracción de trabajadores expanda sus atributos productivos en un grado que se corresponde con la finalización de una carrera universitaria, mientras que le basta con que otra fracción mayor realice un avance parcial en la cursada. Y, por la otra, en que la consolidación de una gran masa de población sobrante en las últimas décadas tuvo como consecuencia que el capital dejara de requerir el mismo grado de desarrollo de atributos productivos a la generalidad de individuos que finalizaban el ciclo de educación media, lo que se expresó en la degradación de parte de dicho ciclo. Este proceso, sin embargo, ha avanzado a tal punto que la formación de trabajadores con atributos productivos no degradados no alcanza a cubrir la demanda existente por ellos. De este modo, el sistema universitario comenzó a desempeñar también el rol de permitir a una fracción de esta población alcanzar o sobrepasar dicho desarrollo.
Editorial
Authors: Gurzynski-Weiss Laura
Published: March 2020

The goal of the special issue is to provide robust examples of how we as a field can research the dynamic nature of learner individual differences (IDs). The papers in this volume provide both a sound theoretical discussion of several IDs in relationship to their (posited or empirically attested) role(s) in L2 learning, as well as specific methodological ideas on how to best reveal the dynamic nature of IDs.
The dynamism of strategic learning: Complexity theory in strategic L2 development
Authors: Amerstorfer Carmen M.
Published: March 2020

Learners of foreign languages (L2s) apply strategies to support learning processes and L2 development. They select strategies according to their individual needs and preferences and adjust their strategic actions to suit situational circumstances and contextual conditions. A holistic investigation of strategic L2 learning processes requires the integration of numerous interconnected, flexibly-interacting influences, which are at constant interplay with each other and whose development is difficult to predict. Validated as effective in other fields of applied linguistics, complex dynamic systems theory (CDST) can also provide an appropriate frame for researching strategic L2 learning. Based on state-of-the-art methodological guidance for complexity research, this article presents the re-analysis of empirical data from a previous study through a complexity lens. It further examines the suitability of CDST in strategy research, explores its practical value, and demonstrates that a complexity perspective can generate new, profound information about strategic learning.
Dynamic properties of language anxiety
Authors: Gregersen Tammy
Published: March 2020

This article begins by examining previous empirical studies to demonstrate that language anxiety, or the negative emotional reaction learners experience when using a second language (MacIntyre & Gardner, 1999), is a dynamic individual difference learner variable. I show that it forms part of an interconnected, constantly-in-flux system that changes unpredictably over multiple time scales. While at certain times this system might settle into an attractor state that accommodates contradictory conditions, perturbations that arise may lead to development and change with the curious possibility that minor disruptions generate large effects while major alterations go unnoticed. In essence, language anxiety (LA) is part of a continuous complex system in which each state evolves from a previous one. After I establish LA as a dynamic variable using the aforementioned criteria, I outline the implications and challenges for researching LA using a dynamic paradigm, which include focusing on individuals, transforming LA research questions, designing interventions and re-thinking data gathering methodologies. I conclude with implications for language teaching that emphasize: 1) raising awareness of the importance of decoding nonverbal behavior to identify moment-by-moment shifts in learner emotion; 2) remaining vigilant concerning variables that are interacting with LA that make this factor part of a cyclical process; 3) understanding that anxiety co-exists with positive emotions to varying degrees and that language tasks are not unanimously enjoyed or universally anxiety-provoking; and 4) incorporating positive psychology activities that proactively encourage buoyancy and resilience for moment-by-moment daily perturbations as well as debilitating disruptions that result in long-lasting influences.
Working memory and second language development: A complex, dynamic future?
Authors: Jackson Daniel O.
Published: March 2020

Working memory (WM) is inherently dynamic and complex, being a multi-faceted system that links storage and processing components; yet it is widely understood as internal. Hence, in second language (L2) research, its connection to complex dynamic systems theory (CDST) remains underspecified. This paper seeks to bridge a gap between CDST and WM in L2 research. First, definitions of WM are reviewed, along with evidence for its relationship to L2 outcomes. Next, a brief overview of CDST highlights its metatheoretical and methodological implications. Three perspectives are presented to illustrate how WM can be viewed in terms of major tenets in CDST. These consider WM effects as: (1) context-dependent, (2) interrelated with those of other variables, and (3) amenable to change across the lifespan. Despite this reappraisal, numerous challenges remain. Thus, in addition to noting research opportunities, the paper also considers measurement issues, such as the determination of boundaries and selection of appropriate timescales. In closing, while WM studies have shown its influence on L2 proficiency and processing, to more fully understand its dynamic nature, what is needed is further research on the reciprocal influences of bilingual development and changes in WM components, such as control of attention.
Expanding the theoretical base for the dynamics of willingness to communicate
Authors: MacIntyre Peter
Published: March 2020

The dynamics underlying willingness to communicate in a second or third language (L2 for short), operating in real time, are affected by a number of intra- and inter-personal processes. L2 communication is a remarkably fluid process, especially considering the wide range of skill levels observed among L2 learners and speakers. Learners often find themselves in a position that requires the use of uncertain L2 skills, be it inside or outside the classroom context. Beyond issues of competencies, which are themselves complex, using an L2 also evokes cultural, political, social, identity, motivational, emotional, pedagogical, and other issues that learners must navigate on-the-fly. The focus of this article will be on the remarkably rapid integration of factors, such as the ones just named whenever a language learner chooses to be a language speaker, that is, when the moment for authentic communication arrives. Communicative events are especially important in understanding the psychology of the L2 learner. Our research group has developed the idiodynamic method to allow examination of an individual’s experience of events on a timescale of a few minutes. Results are describing complex interactions and rapid changes in the psychological conditions that accompany both approaching and avoiding L2 communication. The research takes a new approach to familiar concepts such as motivation, language competence, learning strategies, and so on. By examining willingness to communicate as a dynamic process, new types of research questions and answers are emerging, generating new theory, research methods, and pedagogical approaches applicable both within language classrooms and beyond.
Further exploring the dynamicity, situatedness, and emergence of the self: The key role of context
Authors: Serafini Ellen J.
Published: March 2020

Drawing on theoretical insights from a complex dynamic systems framework, this work explores the ways that learner selves, as they relate to learning and using languages, manifest across different contexts and timescales and emerge in interaction with various factors. First, a broad overview of dynamically-oriented L2 motivation research is provided before critically considering the need for research that aligns with conceptual advances made under the dynamic turn in SLA. In particular, this critical overview highlights a crucial need for more research employing dynamic methods capable of revealing how learner perceptions of self emerge in relation to their interlocutors and in interaction with external factors, including language ideologies that may uniquely characterize sociocultural contexts where target languages other than English are learned. The chapter concludes by discussing ways to implement dynamically oriented methodology that can provide much needed insights into the inherent dynamic, emergent, and contextually and socially embedded nature of learner selves.
My many selves are still me: Motivation and multilingualism
Authors: Thompson Amy S.
Published: March 2020

Two concepts of multilingualism that relate to the selves aspect of Dörnyei’s (2009) L2 motivational self system (L2MSS) are highlighted in this article: Thompson’s concept of perceived positive language interaction (PPLI) and Henry’s notion of the ideal multilingual self. With the dynamic model of multilingualism informing both concepts (Herdina & Jessner, 2002; Jessner, 2006, 2008), the intangible advantage that multilingual speakers have over monolingual speakers is clearly articulated in the discussion of this topic. The interconnectivity of language systems is an inherent aspect of the DMM; as such, both Thompson with PPLI and Henry with the ideal multilingual self incorporate the DMM as a framework to indicate the fluid nature of these constructs as additional language learning experiences are added to the system over time. This article further explores the dynamicity of multilingual learners’ language systems and the influences that induce change. Specifically, data from Thompson’s (2017b) study on LOTE learners are re-examined to explore this question. Additionally, excerpts from Natasha Lvovich’s (1997) The Multilingual Self, an autobiography of an L1 Russian speaker, are analyzed to present different possible models of incorporating the multilingual self and PPLI. The article ends with a discussion of an inherently multilingual context, as well as thoughts regarding the possibility of different types of future selves.
Tracking the dynamic nature of learner individual differences: Initial results from a longitudinal study
Authors: Jung Daniel , DiBartolomeo Megan , Melero-García Fernando , Giacomino Lindsay , Gurzynski-Weiss Laura , Henderson Carly , Hidalgo Marian
Published: March 2020

Individual differences (IDs) have long been considered one of the most important factors explaining variable rates and outcomes in second language acquisition (Dewaele, 2013). While traditional operationalizations of IDs have, explicitly or implicitly, assumed that IDs are static traits that are stable through time, more recent research inspired by complex dynamic systems theory (Larsen-Freeman, 1997, 2020) demonstrates that many IDs are dynamic and variable through time and across contexts, a theme echoed throughout the current issue. This study reports the initial semester of a diachronic project investigating the dynamicity of four learner IDs: motivation, personality, learning and cognitive styles, and working memory. In the initial semester, data from 323 participants in their first year of university-level Spanish were collected and analyzed to determine what type of variability may be present across learners with respect to the four IDs studied at one time point and to discern possible learner profiles in the data or patterns via which the data may be otherwise meaningfully described. The results revealed four types of learner profiles present in the dataset.
Determinant of Foreign Direct Investment Inflows in Asean Countries
Authors: Sasana Hadi , Fathoni Salman
Published: April 2020

Foreign Direct Investment (FDI) believed to be one of the instruments to reduce gap between the rich and the poor countries has considered Asian countries destination, including ASEAN Region. The aim of this study was to analyze factors affecting FDI in ASEAN countries (Cambodia, Indonesia, Malaysia, Philippines, Thailand, and Vietnam) during 2007-2016. The method used to analyze the data was multiple linear regression. The results indicated that market size, government integrity, and infrastructure quality positively affected FDI; wages and exchange rates negatively affected FDI; while, economic crisis had negative effect only in Malaysia. Meanwhile, economic openness, tax rate, and interest rate did not affect FDI inflow in ASEAN countries.
Synthesis of CdSe/ZnS Nanoparticles with Multiple Photoluminescence
Authors: Sliusariak T. K. , Andriichuk Y. M. , Vojtovych S. A. , Zhukovskyi M. A. , Khalavka Y. B.
Published: March 2020

The CdSе/ZnS nanostructures of Core-Shell type, that have multi-wave emission, are described and a scheme of possible energy transitions in the studied system is presented. CdSe nuclei were synthesized by mixing cadmium and selenium precursors without creating an inert atmosphere. The cadmium complex with sulphanilamide was used as a cadmium precursor and simultaneously as a stabilizing ligand. To grow the shell, zinc stearate and thiourea were gradually added to the solution of cadmium selenide nuclei in octadecene at 200°C. TEM studies show that the obtained CdSe/ZnS nanoparticles have the shape close to tetrahedral with an effective diameter up to 10 nm. The thickness of the ZnS shell is about 3-4 nm. From the absorption spectra of the CdSe/ZnS nanoparticles, it is clear that the shell growth leads to a sharp increase in the absorption in the short wavelentgh area, which means the formation of a wide gap ZnS material. The obtained CdSe/ZnS nanostructures emit three fluorescence peaks in the visible range. They are attributed to exciton transitions in the nucleus, recombination at defects of the boundary between the core and the shell, and recombination at defects of the shell. Such property provides CdSe/ZnS nanocrystals with a wide range of functionalities.
Structure and Morphology of Anthraquinone Triazene Films on Silicon Substrate
Authors: Shupenyuk V. I. , Mamykin S. V. , Taras T. N. , Matkivskyi M. P. , Sabadakh O. P. , Matkivskyi O. M.
Published: March 2020

An optimal imposition method of anthraquinone triazenes on silicon lining was selected. This allowed to create a nanometer film that can be used as dielectric aromatic buffer layers. A morphological research of triazene films shows the existence of delocalized globular anthraquinone macromolecular microformation on the background of triazene uneven layers. The oxidized surface of the triazene substrate is applied better than those without the oxide. This is caused by distribution of electron density in triazene which creates an additional Si/SiO2 coupling system and by presence of voluminous aromatic substituents which impairs the uniformity of film deposition and reduces its thickness.
Catalyst Particle Porosity Effect upon Flameless Combustion Characteristics
Authors: Kalinchak V. V. , Chernenko A. S. , Fedorenko A. F. , Sofronkov A. N. , Kramarenko V. V.
Published: March 2020

The problem of heat and mass transfer of a porous catalyst particle is considered. On the her surface, including the inner surface of the pores, an irreversibly heterogeneous first-order reaction proceeds. It has been analytically shown that in a heated gas mixture, the catalyst's porosity reduces the minimum impurity's concentration of catalytic spontaneous combustion in the mixture and increases the catalyst particle's corresponding diameter. This concentration corresponds to the external kinetic and internal diffusion reaction's modes.
Carbon Nanoparticles. Production, properties, perspectives of use
Authors: Maksimyak P. P. , Zenkova C. Yu. , Tkachuk V. M.
Published: March 2020

The paper is devoted to the study of the optical properties of carbon nanoparticles synthesized by the method developed during our experimental studies. The optimal conditions for the creation of carbon nanostructures with predetermined properties are defined. Nanoparticles of the size of about 100 nm were obtained, the maximum of absorption of which is localized at wavelengths in the violet-blue region of the spectrum, while the maximum of luminescence – in the green region of the spectrum. The assumption is made about the possibility of using the obtained particles for correlation diagnostics of optical speckle fields.
Changing of polyethylene film structure during long-term aging
Authors: Yatsyshyn B. P. , Domantsevich N. I.
Published: March 2020

The study of surface structure of polyethylene films after their manufacture and later 7 years of closed storage were carried out. Electron-microscopic studies have revealed the features of the structure formation and aging processes, depending on the amount of organic and organic-mineral fillers, as well as the characteristic features of the destruction of the polymer material matrix.
Hydrogen Sorption Properties, Thermal Stability and Kinetics of Hydrogen Desorption From the Hydride Phase of The MgH2 of a Mechanical Alloys of Magnesium with Ti, Ni and Y
Authors: Ershova O. G. , Dobrovolsky V. D. , Solonin Yu. M.
Published: March 2020

The mechanical alloys-composite MАs (Mg +10 % wt.Ti + 5 % wt.Y and Mg +10 % wt.Ni + 5 % wt.Y) were synthesized. The phase content, microstructure, the thermal stability, kinetics of hydrogen desorption from the MgH2 hydride phase of the obtained MAs were studiedby using XRD, SEM, TDS methods. It has been established that the addition of Ti + Y and Ni + Y to magnesium leads to significant improvement in the kinetics of hydrogen desorption from the  MgH2 hydride phase, which is evidenced by a significant reduction (in 6 and 15 times)in the time of release of all hydrogen from MA1 and MA2, respectively. Due to, Ti, Ni,Y alloying, the decrease in the thermodynamic stability of MgH2 is not found.
Foundry Core Mixtures with Orthophosphoric Acid and Different Aluminum-Containing Compounds
Authors: Liutyi R. V. , Tyshkovets M. V. , Liuta D. V.
Published: March 2020

The scientific and practical issues of the development of core mixtures for foundry, based on phosphate binding materials, are considered. The binder presented in this article differ from those previously known by the fact that scarce prepared metal phosphate binding components and powder solidifiers are not used to produce them. As a result, all developed binders are different forms of aluminum phosphates. It is shown that to obtain them it is possible to use combinations of orthophosphoric acid with aluminum-containing materials of different chemical nature.The formation of high-strength phosphate binders in the interaction of phosphoric acid with aluminosilicates and sludge wastes of aluminum production has been established. They are rationally used for processes of thermal strengthening of cores in the temperature range of 200…300 °C.The formation of binders in the interaction of orthophosphoric acid with inorganic aluminum salts are theoretically proved and practically confirmed. The results are confirmed by thermodynamic calculations, as well as by X-ray phase analysis.The compositions of the developed core mixtures and examples of their application for obtaining high-quality castings from iron and steel are presented.
Influence of polyfunctional nanomodificators on the microstructure of concrete composites of high strength and density
Authors: Sumariuk O. V. , Romankevych V. F. , Halunka O. D. , Kutsyk O. V. , Polevetsky V. V. , Novikov S. M. , Fodchuk I. M.
Published: March 2020

The patterns of formation of highly functional concretes structure, which consist in formation of an ordered, low-porous, fine-crystalline microstructure of cementitious matrix, in particular due to pozzolanic reactions of the non-clinker part of the binder with formation of an additional amount of low-basic hydrocarbons, are investigated.
Electrochemical properties of nanoporous carbon materials obtained from raw materials of plant origin (hemp shives)
Authors: Ivanichok N.Ya. , Budzuliak I.M. , Moiseienko M.I. , Lisovskiy R.P. , Rachii B.I. , Gamarnyk A.M. , Turovska L.V. , Lisovska S.A.
Published: March 2020

The paper reveals the results of electrochemical studies of activated nanoporous carbon material (NPC) as an electrode material for electrochemical capacitors (EC), the charge of which is accumulated in an electrical double layer (EDL). NPC material has been obtained from raw material of plant origin (hemp shives) by thermochemical activation using phosphoric acid. It has been established that there is an optimal ratio between the amount of acid and precursor based on plant biomass that is equal to 0.75:1. The specific surface area of ​​the obtained NPCwas ~ 2000 m2/g, and the maximum specific capacitance of EC models based on them was ~ 113 F/g. At the same time, the contribution of the EDL capacitance to the total capacitance is 60-80 %.
Thin films of vinylidene fluoride copolymer with tetrafluoroethylene: dynamics of ferroelectric polarization switching
Authors: Fedosov S. N. , Sergeeva A. E.
Published: March 2020

The vinylidene fluoride copolymer with tetrafluoroethylene P(VDF-TFE) is a typical ferroelectric polymer that has not been sufficiently studied so far in comparison with pure polyvinylidene fluoride (PVDF) and its copolymer with trifluoroethylene. The purpose of this work was to reveal the features of forming ferroelectric polarization and its switching in thin films of P(VDF-TFE) under various conditions, such as the level of the applied electric field and the duration of its action within 8 orders of magnitude from 10 μs to 100 s. The sequence of voltage pulses applied during poling and polarization reversal allowed to reveal the characteristics of the polarization switching dynamics. To increase the resolution of the measurements, two complementary methods of recording electrical induction were used. The features of polarization and space charge relaxation over time have been studied by thermally stimulated depolarization method. A new phenomenon of gradual separation of the relaxation processes associated with polarization and space charge was observed. Both components were accompanied by trapped charges that compensated the depolarizing field. Several practical recommendations have been formulated regarding the desirable values of poling parameters and additional processing to increase the ferroelectric polarization stability.
The Important Questions of Statistical Theory of the Crystals' Thermal and Kinetics Properties
Authors: Budzhak Ya. S. , Wacławski T.
Published: March 2020

In this paper, the short algorithmic formulas for computations of the crystals thermal and kinetic properties are given. These formulas are fulfilled the case of isotropic crystals for any one of dispersion laws of current carriers, where these carriers can be scattered by all kinds of the crystal lattice defects. In the paper, these algorithmic formulas were used to calculations the important properties of crystals with the nonparabolic Kane’s dispersion law of current carriers. Here, the passing from these non-parabolic dispersion law crystals to the parabolic dispersion law crystals was also described.
Оптичні властивості CdTe, легованого Ca
Authors: Prokopiv V.V. , Mazur T.M. , Slyotov M.M. , Mazur M.P. , Kinzerska O.V. , Slyotov O.M.
Published: March 2020

Досліджено оптичне поглинання, відбивання і люмінесценцію CdTe:Ca. Встановлено, що отримані леговані Ca поверхневі шари характеризуються інтенсивною фотолюмінесценцією з η = 8-10% у крайовій області. Випромінювання формується внаслідок міжзонної рекомбінації вільних носіїв заряду і анігіляцією зв’язаних на ізовалентних домішках Ca екситонів. Зазначені складові спостерігаються у диференційних спектрах оптичного відбивання Ŕω у приповерхневому шарі отриманому при  легування ізовалентною домішкою Ca підкладинок CdTe. Встановлено, що легування обумовлює утворення p-типу провідності.