bluuebunny/crossref_metadata_2025_split huggingface dataset:
Additive manufacturing and characterization of a stainless steel and a nickel alloy
Authors: Isik Murat 
Published: March 2023

Abstract
Recently, additive manufacturing is of interest, and there is a trend to study additively manufactured materials such as Inconel 718 and 316L stainless steel. Additive manufacturing brings the easiness of production of complex geometries, avoids expensive tools, helps achieve interesting microstructures and obtaining promising results for future applications. Since the additive procedure is sensitive to many fabrication variables thereby affecting the microstructure and mechanical properties. This motivation promotes investigating the additively manufactured microstructure of 316L stainless steel and Inconel 718. While 316L stainless steel was fabricated using an electron-based powder bed fusion manner, directed energy deposition was preferred for Inconel 718. Samples were examined utilizing optical and scanning electron microscopes. Results suggest processing of 316L stainless steel gives rise to the same porosity rate as Inconel 718. Bimodal equiaxed austenite grain morphology was observed whereas no dendrite presence was detected for 316L stainless steel. Additive manufacturing types do not cause a significant change in the level of porosity for Inconel 718 alloy. Unlike the case of stainless steel, additive manufacturing results in dendritic microstructure formation in Inconel 718 whereas powder bed fusion-type production triggers a better refinement compared to that of directed energy deposition.
Buckling in rectangular hybrid composite plates with angled groove-shaped cut-outs
Authors: Deniz Mehmet Emin , Bardakci Ramazan , Aydın Fırat 
Published: March 2023

Abstract
In this paper, eight-layer composite laminates were produced using twill and plain woven glass and carbon laminate fibers as a reinforcement element and as a matrix with epoxy resin. All laminates having the layup of [(0°/90°)2]s but the hybrid laminate arrangement varies between the number of woven glass and carbon laminates. The buckling behaviour of woven composite laminates used for typical of the aerospace industry is investigated. Un-grooved and grooved with centered elliptical groove angles with 0°, 15°, 30°, 45°, 60°, 75° and 90° specimens were subjected to buckling tests. It was investigated how the woven type, laminate designation, and groove angles affect the buckling behaviour. Cut-out causes to decrease of buckling load of composite plates. It is understood that the buckling load increased with regard to the increase groove angle (from 0° to 90°) of the composite plates. As the laminate designation changed, the buckling load also changed significantly. The buckling load of composite plates is highly influenced by its weave type. As a fiber, it has been determined that the buckling behaviour of carbon fiber is better than glass fiber. In addition, it was concluded that the twill weave type is generally better than the plain weave type.
Axicon metalens for broadband light harvesting
Authors: Chang Kai-Hao , Chen Yen-Chun , Huang Yo-Song , Hsu Wei-Lun , Lu Guo-Hao , Liu Chao-Feng , Weng Chun-Jen , Lin Yu-Hsin , Chen Che-Chin , Lee Chien-Chieh , Chang Yu-Chi , Wang Po-Hsiang , Wang Chih-Ming 
Published: March 2023

Abstract
In this study, an axicon metalens comprising a large central disc surrounded by nanoposts for energy harvesting in composite metal-oxide semiconductor sensors was designed, fabricated, and experimentally characterized. The main role of the central disc is focusing light; the nanoposts of various diameters deflect light to form a Bessel-like beam. The spatial distribution of the optical transmission was measured using micro-hyperspectral imaging. The axicon metalens concentrates the light to the sensitive area of the sensor and also harvests light from adjacent pixels. After adding an axicon metalens, the normalized peak transmission is up to 250% at λ = 700 nm as compared to a blank TiO2 film. The experimental results had fair agreement with the finite-difference-time-domain simulation. The ultra-broadband energy-harvesting performance of the sensor suggests that it could be applied in surveillance and Internet of Things applications.
Broadband wireless communication with space-time-varying polarization-converting metasurface
Authors: Hu Qi , Chen Ke , Zheng Yilin , Xu Zhiyuan , Zhao Jianmin , Wang Jian , Feng Yijun 
Published: March 2023

Abstract
Reconfigurable metasurfaces have emerged as a promising alternative to the conventional transmitter of wireless communication systems, due to their abilities of encoding digital information onto electromagnetic properties without complex radio-frequency chains. However, most of them are still limited to narrow operation bandwidth. Here, we propose a broadband metasurface-based wireless communication system that can actively adapt to multiple users located at versatile directions through joint modulation of digital signals in the time domain and wave scatterings in the space domain. As exemplary demonstrations, highly directive beams are generated to enhance regional signals in real-time customized for users in desired directions and reduce the signal leakage in undesired directions. Experiments are carried out to verify that the system can provide stable wireless communication service in a broad band of 3.7–5.1 GHz, within which the transmitted color picture enabled by the time-varying spatial modulation of metasurface can be successfully recovered at the user terminals. The proposed system may offer untapped potentials for next-generation communications and radar systems where regional signal enhancement, active adaption to users, and large channel capacities are required.
Photochemistry in IUPAC: the Committee (1976–2001) and the Sub-Committee (2001–)
Authors: Braslavsky Silvia E. 
Published: March 2023

Abstract
The history of the IUPAC Photochemistry Committee since its creation in 1976 and its transition in 2001 to the IUPAC Photochemistry Sub-Committee are reviewed as well as the connections of Committee and Sub-Committee to the various photochemical associations (European Photochemical Association, EPA, Inter-American Photochemical Society, I-APS and Asian and Oceanian Photochemistry Association, APA). The participants in both the Commission and the Sub-Committee over the years are listed as well as the Recommendations and Technical Reports produced since the creation of the Committee until the present days.
Closed-shell and open-shell dual nature of singlet diradical compounds
Authors: Kubo Takashi 
Published: March 2023

Abstract
Unlike triplet diradicals, singlet diradicals can vary in diradical character from 0 % to 100 % depending on linker units that allow two formally unpaired electrons to couple covalently. In principle, the electronic structure of singlet diradicals can be described as a quantum superposition of closed-shell and open-shell structures. This means that, depending on the external environment, singlet diradicals can behave as either closed-shell or open-shell species. This paper summarizes our progress in understanding the electronic structure of π-conjugated singlet diradical molecules in terms of closed-shell and open-shell dual nature. We first discuss the coexistence of intra- and intermolecular covalent bonding interactions in the π-dimer of a singlet diradical molecule. The intra- and intermolecular coupling of two formally unpaired electrons are related to closed-shell and open-shell nature of singlet diradical, respectively. Then we demonstrate the coexistence of the covalent bonding interactions in the one-dimensional stack of singlet diradical molecules having different diradical character. The relative strength of the interactions is varied with the magnitude of singlet diradical index y
0. Finally, we show the dual reactivity of a singlet diradical molecule, which undergoes rapid [4 + 2] and [4 + 4] cycloaddition reactions in the dark at room temperature. Closed-shell and open-shell nature endow the singlet diradical molecule with the reaction manner as diene and diradical species, respectively.
Comparative analysis of gas-assisted extrusion of polypropylene sheet based on two types of gas intake
Authors: Jiang Shiyu , Liu Hesheng , Yu Zhong , Tang Gang , Jiang Qingsong , Huang Yibin 
Published: March 2023

Abstract
The formation of a stable gas layer is to have a significant effect on polymer gas-assisted extrusion (GAE). Previously, for vertical extrusion forming, the gap intake method was used, which tends to result in very short stabilization times for the gas layer. In this study, the effect of two gas intake modes was compared based on horizontal sheet extrusion. The results show that stabilization of the gas layer is easily achieved in the vertical gas-assisted die by introducing gas first. However, when using parallel die, the gas distributes the melt uniformly along the surrounding velocity and the gas layer can be stable for a long time. Moreover, disrupting the process sequence also makes it easy to achieve gas layer stability without affecting the tability of the gas layer in the subsequent extrusion. And, during low-speed extrusion, the flow inertia of the polymer melt is used to extend the flow channel of the gas-free–assisted section into the gas-assisted section to overcome the gravity of the polymer melt and smoothly extrude it in the parallel gas-assisted die. The parallel die can be considered for the production of GAE of daily profiles and can be used to improve quality.
DNA demethylation fine‐tunes IL‐2 production during thymic regulatory T cell differentiation
Authors: Teghanemt Athmane , Misel‐Wuchter Kara , Heath Jace , Thurman Andrew , Pulipati Priyanjali , Dixit Garima , Geesala Ramasatya , Meyerholz David K , Maretzky Thorsten , Pezzulo Alejandro , Issuree Priya D 
Published: March 2023

AbstractRegulatory T (T reg) cells developing in the thymus are essential to maintain tolerance and prevent fatal autoimmunity in mice and humans. Expression of the T reg lineage‐defining transcription factor FoxP3 is critically dependent upon T cell receptor (TCR) and interleukin‐2 (IL‐2) signaling. Here, we report that ten‐eleven translocation (Tet) enzymes, which are DNA demethylases, are required early during double‐positive (DP) thymic T cell differentiation and prior to the upregulation of FoxP3 in CD4 single‐positive (SP) thymocytes, to promote Treg differentiation. We show that Tet3 selectively controls the development of CD25− FoxP3lo CD4SP Treg cell precursors in the thymus and is critical for TCR‐dependent IL‐2 production, which drive chromatin remodeling at the FoxP3 locus as well as other Treg‐effector gene loci in an autocrine/paracrine manner. Together, our results demonstrate a novel role for DNA demethylation in regulating the TCR response and promoting Treg cell differentiation. These findings highlight a novel epigenetic pathway to promote the generation of endogenous Treg cells for mitigation of autoimmune responses.
Aumento de tejido gingival queratinizado alrededor de implantes dentales con matriz de colágeno porcino. Reporte de caso
Authors: Coutiño Cerda Ximena , Martínez Gutiérrez Daniel , Harris Ricardo Jonathan 
Published: March 2023

Dentro de la literatura periodontal se ha reconocido la importancia del tejido queratinizado alrededor de los implantes dentales, así como la mejoría de los vestíbulos bucales poco profundos para permitir la rehabilitación protésica del paciente. Para superar las deficiencias de un vestíbulo corto y del tejido blando periimplantario se ha descrito el uso de una matriz de colágeno porcino en conjunto con la vestibuloplastía como una alternativa segura, estética y funcional, otorgando al clínico y al paciente resultados predecibles y similares comparados con los ofrecidos por el tejido conectivo o el injerto gingival libre. El objetivo del presente reporte es demostrar a través de un caso clínico, el uso de la matriz de colágeno porcino en un paciente sometido a una vestibuloplastía del sector anteroinferior y el aumento de encía queratinizada alrededor de dos implantes inferiores.
Європейські стандарти публічного управління взаємодією публічної влади та бізнесу
Authors: Бардах Олександр 
Published: March 2023

Бізнес відіграє велику роль у політичному житті сучасного українського суспільства. Ця тема набула особливої актуальності у зв’язку з військовою агресією і потребою відновлення країни після війни. Майбутні проекти реконструкції та зростання пов’язані з активізацією участі України в глобалізаційних процесах та врахуванням в публічному управлінні європейських стандартів та підходів до взаємодії влади та бізнесу.
У статті розглянуто найбільш поширені в Європі концепції державного управління взаємодією влади та бізнесу, зокрема корпоратизм, плюралізм, інструменталізм тощо. На їх основі проведено аналіз особливостей взаємодії влади та бізнесу в Україні. Розглядаються різні теоретико-методологічні підходи до вивчення бізнесу як політичного актора. Групи інтересів та групи тиску є різновидами протекціоністських груп, які впливають на дії сучасної влади, як в Європі, так і в Україні. Суспільство складається з великої кількості таких груп інтересів і груп тиску, які представляють всі значні інтереси населення і конкурують між собою за вплив на державну владу. Ця конкуренція проходить у рамках міжсекторального партнерства, тобто досягнутого консенсусу з приводу базових основ економічної і політичної системи та допустимого рівня конфлікту. У країнах розвиненої демократії конкуренція між групами та секторами суспільства забезпечує такий стан, при якому жодна з груп не домінує, і зберігається баланс інтересів. Цей баланс відіграє вирішальну роль для стабільності існуючої соціальної системи.
Автор робить висновок, що з розглянутих у статті концепцій, які аналізують взаємодію влади та бізнесу, найбільш прийнятним для українських реалій є ліберальний корпоратизм. Розгляд держави як окремої корпорації, яка має свої відмінні від бізнес-структур та громадянського суспільства інтереси і при цьому будує з ними партнерські відносини, надає можливості більш детально аналізувати організаційні форми взаємодії влади та бізнесу, особливості державного управління у цій сфері, до того ж враховуючи тенденції глобалізації, що накладають свої обмеження на цю взаємодію.
Механізм реалізації державного регулювання гарантій науково-педагогічних працівників
Authors: Вайновський Євгеній 
Published: March 2023

Актуальність дослідження зумовлено тим, що держава має гарантувати кожній людині освіту. З’ясовано, що здібності окремо взятої особи забезпечують надалі кожну людину зайнятістю у трудовій сфері. Установлено, що значний відсоток здобувачів освіти працевлаштовується не за отриманою спеціальністю, віддаючи перевагу іншій сфері діяльності. Виявлено, що причинами такої ситуації, що склалася, є надання неактуальних знань здобувачам вищої освіти, відсутність мотивації у науково-педагогічних працівників передавати актуальні знання таким здобувачам вищої освіти.
На цій підставі обґрунтовано, що необхідна цілісна концепція з надання гарантій науково-педагогічним працівникам, що (гарантії) підвищать рівень мотивації у таких працівників до саморозвитку, більшої професійної віддачі на роботі, застосування інноваційних методів в її межах тощо. Відтак, метою статті визначено обґрунтування механізму реалізації державного регулювання гарантій науково-педагогічних працівників. У цьому контексті система гарантій визначена як механізм, призначений відмежовувати індивідів від різного роду несприятливих для його життєдіяльності впливів з боку соціального середовища і пом’якшувати наслідки таких впливів. У межах даної статті механізм реалізації державного регулювання гарантій науково-педагогічних працівників розглянуто як самоорганізовану сукупність елементів, факторів і умов, які впорядковуються державними органами з метою досягнення заданого результату (тобто надання гарантій науково-педагогічним працівникам).
З’ясовано, що через уведення в Україні воєнного стану права та свободи, а також деякі гарантії науково-педагогічних працівників, на жаль, обмежені. Установлено, що під час воєнного стану для виконання невідкладних чи непередбачуваних завдань науково-педагогічні працівники, за їх згодою, на підставі наказу керівника, про який повідомляється профспілка, можуть бути залучені до роботи понад встановлену тривалість робочого дня, а також у вихідні, святкові та неробочі дні у нічний час.
У той же час, акцентовано, що науково-педагогічні працівники не повинні повністю обмежуватися у праві на: 1) захист професійної честі, гідності; 2) вибір форм, методів, засобів навчання, педагогічну ініціативу; 3) індивідуальну педагогічну діяльність; 4) участь у громадському самоврядуванні; 5) підвищення кваліфікації, перепідготовку, вибір змісту, програм, форм навчання, закладів, установ організацій, що здійснюють підвищення кваліфікації і перепідготовку.
Instrument to Assess the Perception of Sound and Rhythm for Children with Hearing Impairment
Authors: Hernawati Tati , Rusyani Endang , Wibowo Setyo Wahju , Herawati Nenden Ineu 
Published: March 2023

Children with hearing impairments experience hearing loss from mild to profound, which is grouped into hard of hearing and deafness. The direct impact of hearing loss is the inability/difficulty to catch various sounds, including the sound of the language. Those with hearing impairments must be made aware of sound, especially children classified as hard of hearing, whose remaining hearing must be stimulated to train their sensitivity so that their hearing function can be optimized. Therefore, they are given special services in the form Development of Communication, Perception of Sound and Rhythm. The program provided must be under their learning conditions and needs; therefore, an assessment is needed. This study aimed to formulate an assessment instrument for sound and rhythm perception for children with hearing impairments at Special Education Elementary School. This study used a qualitative approach with a descriptive method. This study was designed in three stages: (1) preliminary stage with literature study and documentation study on the curriculum for developing sound and rhythm perception communication,f (2) drafting stage of the assessment instrument for Sound and Rhythm Perception, and (3) validation stage of assessment instrument by measurement & education experts for children with hearing impairment and practitioners (teachers at Special Education School). The result was a hypothetical sound and rhythm perception assessment instrument that needed to be implemented at the next research stage. This instrument for assessing the perception of sound and rhythm covered the aspects of sound detection, sound discrimination, and sound comprehension. This study result can be used as a reference for teachers in carrying out a sound perception assessment before conducting a special program for Developing Communication for the Perception of Sound and Rhythm.
Variations in timbre qualia with register and dynamics in the oboe and French horn
Authors: Reymore Lindsey 
Published: March 2023

Many musical instruments produce a myriad of sound colors resulting from diverse playing techniques, both traditional and extended. Such techniques include parameters that are often regularly manipulated in music, such as pitch, intensity (dynamics), articulation style, and duration. Despite the likely contribution of such timbral variations to musical experience, within-instrument timbral flexibility and its semantic consequences have not been addressed empirically. Participants rated sounds produced by the oboe and the French horn on 12 combinations of register and dynamics using the 20-dimensional timbre qualia model from Reymore and Huron (2020). Data are modeled with Exploratory Factor Analysis, partial proportional odds regressions, and random forest classifiers. Although trends between ratings and register/dynamics emerged, the results illustrate the complexity of within-instrument timbral variability. Some trends were approximately linear, others demonstrated non-linear patterns, and some timbre qualia dimensions displayed interactions between register and dynamics. While certain trends were shared between the oboe and French horn, such as an increase in sparkling/brilliant ratings with register, others seem to be unique to each instrument, such as the relationship of ratings of woody to register for the oboe or of ratings of muted/veiled to dynamics for the horn. Results demonstrate that within-instrument timbral variability based on dynamic and register is apparent to listeners and that semantic interactions among parameters can be present. The methodology established in this paper can be extended to address within-instrument timbral flexibility with respect to articulation, duration, and other sources of variation for any instrument or group of instruments.
Efficacy and safety of direct oral anticoagulants versus vitamin K antagonists for left ventricular thrombus: an updated systematic review and meta-analysis
Authors: Golukhova E. Z. , Berdibekov B. Sh. , Ruzina E. V. 
Published: March 2023

Aim To perform a systematic review and meta-analysis of efficacy and safety of direct oral anticoagulants (DOAC) as compared to vitamin K antagonists (VKA) in the treatment of left ventricular (LV) thrombosis.Material and methods A search was performed in PubMed and Google Scholar for studies that compared DOAC and VKA in the treatment of LV thrombosis with respect of thromboembolic events, hemorrhagic complications, and thrombus resolution. The effect was evaluated with the odds ratio (OR) that was computed using a fixed effects model.Results For these systematic review and meta-analysis, 19 studies were selected, including 2 randomized and 17 cohort studies. The articles included into these systematic review and meta-analysis, were published from 2018 through 2021. In total, 2970 patients (mean age, 58.8 years; 1879 (61.2 %) men) with LV thrombus were included into the meta-analysis. Mean follow-up duration was 17.9 months. The meta-analysis showed no significant difference between DOAC and VKA in the incidence of the study outcomes: thromboembolic events (OR, 0.86; 95 % CI: 0.67–1.10; р=0.22), hemorrhagic complications (OR, 0.77; 95 % CI: 0.55–1.07; р=0.12), thrombus resolution (OR, 0.96; 95 % CI: 0.76–1.22; р=0.77). In a subgroup analysis, rivaroxaban compared to VKA significantly (79%) reduced the risk of thromboembolic complications (OR, 0.21; 95 % CI: 0.05–0.83; р=0.03) with no significant differences in hemorrhagic events (OR, 0.60; 95 % CI: 0.21–1.71; р=0.34) or thrombus resolution (OR, 1.44; 95 % CI: 0.83–1.31; р=0.20). The apixaban treatment group had significantly more (4.88 times) cases of thrombus resolution than the VKA treatment group (OR, 4.88; 95 % CI: 1.37–17.30; р=0.01); for apixaban, data on hemorrhagic and thromboembolic complications were not available.Conclusions The therapeutic efficacy and side effects of the DOAC treatment for LV thrombosis were similar to those of VKA with respect of thromboembolic events, hemorrhage, and thrombus resolution.
Direitos humanos, a educação em direitos humanos e a educação moral: inter-relações
Authors: Pavaneli Camila Fernanda Dias , Lugli Ieda Alves , Martins Raul Aragão 
Published: March 2023

Os direitos humanos representam uma conquista histórica, pois pela primeira vez fornece uma política para expressar nossas preocupações comuns e uma moral universalmente acessível. Assim, estabelece traços morais entre seres de todo o mundo e auxilia na criação de uma consciência de humanidade compartilhada. Dessa forma, o presente ensaio teve por objetivo verificar a relação entre os direitos humanos, a educação em direitos humanos e a educação moral, levando em consideração práticas que promovam o desenvolvimento moral mais elevado da moralidade, fundamentado na justiça universal, no respeito à dignidade e na igualdade dos direitos humanos. Para tanto foram realizadas buscas nos portais SciELO, PePSIC e Portal Capes. Embora a educação moral e a educação em direitos humanos compartilham ideias e métodos, as áreas possuem diferenças que podem fortalecer a educação sociomoral e, consequentemente, promover o desenvolvimento moral autônomo.