bluuebunny/crossref_metadata_2025 huggingface dataset:
College music teaching and ideological and political education integration mode based on deep learning
Authors: Wang Xiaoshu , Zhao Suhua , Liu Jingwen , Wang Liyan
Published: April 2022

In order to highlight the role of music teaching in the teaching of ideological and political courses, this study puts forward research on the integration of music teaching and ideological and political teaching. This study analyzes the promotion and necessity of college music teaching to ideological and political work, constructs a fusion model of college music teaching and ideological and political work, introduces deep learning methods, and weakens the influence of errors in the data of college music teaching and ideological and political work. This study also optimized the integration mode of college music teaching and ideological and political work and realized the model research of college music teaching and ideological and political work. The experimental results show that the resource output amplitude controlled by the deep learning method has the best stability, and there is no large amplitude fluctuation during the experiment. The output amplitude and control time of the fusion resource are guaranteed and the fusion path of music teaching and ideological and political education is clearer. The maximum control time of the fusion resource of this method is 23.55 ms.
Safety analysis for integrity enhancement in nuclear power plants (NPPs) in case of seashore region site
Authors: Woo Tae Ho , Baek Chang Hyun , Jang Kyung Bae
Published: April 2022

It is investigated for the seismic consequences in the nuclear power plant (NPP) where the radiological hazard could be one of critical issues when the safety system is in failure. The artificial learning is done during the calculations of each time step. There are the simulations for the artificial neural networking (ANN) as the precision, sensitivity (recall value), specificity, and accuracy which are 21.48%, 50.53%, 25.47%, and 32.68% respectively. Likewise, the recurrent neural network (RNN) modeling has 23.64%, 54.53%, 25.56%, and 34.17% respectively. In the comparisons for ANN and RNN, the values of ANN’s parameters are lower than those of RNN in all values of precision, recall, specificity, and accuracy. As the designed factors for the nuclear matters increase, the estimations could be better in considering the conditional situations.
Strong convergence of a self-adaptive inertial Tseng's extragradient method for pseudomonotone variational inequalities and fixed point problems
Authors: Uzor Victor Amarachi , Alakoya Timilehin Opeyemi , Mewomo Oluwatosin Temitope
Published: April 2022

In this paper, we study the problem of finding a common solution of the pseudomonotone variational inequality problem and fixed point problem for demicontractive mappings. We introduce a new inertial iterative scheme that combines Tseng’s extragradient method with the viscosity method together with the adaptive step size technique for finding a common solution of the investigated problem. We prove a strong convergence result for our proposed algorithm under mild conditions and without prior knowledge of the Lipschitz constant of the pseudomonotone operator in Hilbert spaces. Finally, we present some numerical experiments to show the efficiency of our method in comparison with some of the existing methods in the literature.
Moscatilin suppresses the inflammation from macrophages and T cells
Authors: Zhang Ying , Xu Yugang , Jing Xiujie , Lu Wenkui , Zhang Fusen , Qin Chengkun
Published: April 2022

In this study, we aim to investigate moscatilin in alleviating symptoms of autoimmune liver disease (ALD) in a concanavalin A (ConA)-induced liver injury mouse model and elucidate the underlying mechanisms. ALD mouse models were constructed by intravenous injection of ConA (20 mg/kg) and the serum level of alanine aminotransferase (ALT) was measured using an enzyme-linked immunosorbent assay. Moscatilin in various doses was administered for two days starting from a day before the ConA injection. We showed that moscatilin dose-dependently decreased ALT levels in liver tissue of ALD mouse models. Ifng and Tnfa also showed significant downregulation in liver tissues. Macrophages only showed significant Tnfa downregulation and CD4+ T cells only showed significant Ifng downregulation at high moscatilin doses. In vivo administration of moscatilin induced interleukin-37 upregulation in hepatic tissues. In vitro, moscatilin also induced IL-37 upregulation in hepatic stellate cell line JS-1 rather than immune cells represented by RAW264.7 and CTLL-2 cell lines, suggesting that the hepatic stellate cell is majorly responsive to moscatilin treatment in terms of interleukin (IL)-37 upregulation. Our data indicate that moscatilin could alleviate liver injury in ConA-induced ALD mouse models through anti-inflammatory activities, warranting further development of moscatilin as a new drug in treating ALD.
Analysis of microstructure evolution during heat treatment of CoSm permanent magnets using high-resolution scanning electron microscopy
Authors: Braun Philipp , Laukart Judith , Golla-Schindler Ute , Löffler Ralf , Goll Dagmar , Schneider Gerhard
Published: April 2022

CoSm permanent magnets are characterized by high coercivity, which is due to the formation of a cellular nanostructure. For the understanding and optimization of these magnets, the evolution and morphology of the cellular structure need to be analyzed, most commonly by transmission electron microscopy (TEM). Meanwhile, high-resolution scanning electron microscopy (SEM) is enabling the visualization and large-scale imaging of the nanostructure while requiring relatively little preparation effort, combined with easy sample handling. Different preparation techniques will be used to visualize different microstructural constituents, enabling the analysis of their morphologies and fractions.
Non-destructive Metallurgical Failure Investigation of Erroneously Heat Treated Hot Gas Path Component Using Replica Technique
Authors: Neidel Andreas , Gädicke Tobias , Giller Madeleine
Published: April 2022

Metallic heat shields, used in combustion chambers of heavy-duty gas turbine engines and made of nickel-based superalloys, were accidentally heat treated during fabrication, using wrong parameters. There were concerns about embrittlement. Nondestructive metallurgical material characterization using the replica technique verified embrittlement by secondary phases. In spite of this, it was recommended to the client to use the affected parts as is, this on the grounds that no grain growth was observed and hardness was not elevated. While the case study presented in this contribution may appear trivial at first sight, it interestingly shows how metallographic examinations may sometimes be performed non-destructively, without sacrificing any engine components. The inclined reader should also note the superb quality of the photomicrographs presented in this contribution. They were taken from replica foils, not actual metallographic sections.
Erfassung der Schmelzbadfläche mit Korrektur der Perspektive zur Prozessregelung eines Wire and Arc Additive Manufacturing
Authors: Richter Andreas , Scheck Maxim , Bohn Christian , Rembe Christian
Published: April 2022

Die additive Fertigung ermöglicht eine flexible Herstellung von Kleinserien oder komplexen Bauteilen. Die Vorteile dieses Verfahren liegen vor allem in der hohen Flexibilität und der Möglichkeit, anspruchsvolle Geometrien zu fertigen. Unter dem Schlagwort 3D-Druck werden dabei verschiedene Verfahren zusammengefasst, die auf Basis eines CAD-Modells lagenweise das Bauteil erzeugen. „Wire and Arc Additive Manufacturing“ (WAAM) nutzt einen Lichtbogenschweißprozess, um das Material schichtweise aufzutragen. Dies ermöglicht höhere Auftragsraten im Vergleich zu pulverbett- und laserbasierten, additiven Fertigungsverfahren bei gleichzeitig geringeren Investitionskosten. Die Wahl der Prozesseinstellgrößen erfolgt größtenteils heuristisch, die mangelnde Wiederholbarkeit verhindert aktuell eine breite Anwendung des WAAM-Verfahrens. Die Verwendung eines geschlossenen Regelkreises bietet die Möglichkeit, auftretende Prozessstörungen direkt auszuregeln und die Wiederholbarkeit zu gewährleisten. Der geschlossene Regelkreis erfordert die Erfassung des Prozesses mit geringer Latenz. In diesem Beitrag stellen wir die Echtzeitmessung der Schmelzbadfläche auf Basis eines selbst entwickelten Quotientenpyrometers, welches das Licht vom Lichtbogen ausblendet, beim Metall-Aktivgasschweißen (MAG) mit Stahl vor. Durch die Echtzeiterfassung kann das Signal für eine Regelung der Schmelzbadfläche verwendet werden.
Anthropometric, Physiological, and Physical Profile of Elite Snowboarding Athletes
Authors: Wang Zhiqiang , Zhong Yaping , Wang Sugai
Published: April 2022

A successful snowboarding performance is a multifactorial accomplishment resulting from a complex interaction of the major fitness components. This review aimed to examine the anthropometric, physiological, and physical profiles of elite snowboarding athletes. A database search was performed in the China National Knowledge Infrastructure, PubMed, SPORT Discus, and Web of Science. The findings indicate that (a) elite speed-based and skill-based athletes generally had low body fat percentages. The height and body mass of men athletes are slightly larger than those of skill-based athletes. (b) The energy system predominantly engaged in is anaerobic metabolism. Muscle oxidative metabolism could help to promote recovery in the repeated high-intensity runs. (c) Top levels of lower-body strength, especially the eccentric force production and explosive concentric power production of athletes, have a determinant role in rapid riding and turning, jump amplitude, trick difficulty, and successful landing. The take-off velocity of skill-based snowboarding and the starting and turning speed of speed-based snowboarding also have a major effect on success in competitions. Further research is warranted to investigate the anthropometry, the relative energy system contributions from aerobic and anaerobic metabolism, and the physical training on performance while considering the possible differentiated effects of different snowboarding disciplines.
Combining In Situ Monitoring and X-Ray Computed Tomography to Assess the Quality of Parts Manufactured by Laser Powder Bed Fusion and Electron Beam Melting
Authors: Sperling Philip , Fuchs Patrick , Austermuehl René Philipp
Published: April 2022

In the most recent metal powder bed fusion systems, different in situ monitoring sensors are available. The information from this data can be used to gain knowledge about the part quality. Experiments were carried out on two sets of parts: one produced by laser powder bed fusion and one by electron beam melting. Both sets of parts were analyzed in terms of their monitoring data and additional computed tomography scans. This paper shows different quality assessment approaches with conventional methods and modern machine learning.
Material Development Standards and Methods for Additive Manufacturing in Construction to Meet Building Code Requirements for Certification
Authors: Dubov Alexey , Ruben Sam
Published: April 2022

A major challenge of applying additive manufacturing (AM) to regulated industries is that the resulting printed material(s) have to meet the requirements of those particular applications. Unfortunately, for many novel applications of AM, there are not yet standards in place to provide a framework for ensuring those requirements are met. The construction industry has very high standards for materials and methods of manufacturing—for example, one- or two-hour fire ratings and low thermal conductivity. Traditional buildings, structures, and building components include an exterior member, an interior member, and a plurality of cross members between them where each member is formed with different materials that should perform together as one system or subsystem. With AM, the volumetric building or building component can be formed from a multi layer stack of three-dimensionally printable material designed with fire rating, thermal conductivity, and other requirements in mind. Such printed structures can be monolithically integrated, which is a significant advantage for materials with low thermal conductivity as it allows the elimination of dozens of manufacturing and assembly operations used in traditional buildings. An outer surface region of such a printed structure can form the final surface finish, either by itself or with some overlying finish or a protective layer added. The structure can have cavities for a fill material deposited into openings between the exterior and interior members. Large-scale three-dimensional printing machines should be equipped with sensors and logging systems to ensure the quality and consistency of the printing process. This paper explores the use of AM in the construction of buildings and proposes a model for ensuring quality starting at the point of material development and continuing through to completion—the purpose of which is to create greater efficiency and uptake in the novel use of AM in construction and other highly regulated industries.
A New Kinetic Modeling of Polyamide 12 Degradation in Selective Laser Sintering
Authors: Yang Feifei , Chen Xu
Published: April 2022

A considerable amount of expensive polyamide 12 material remains unjoined in selective laser sintering (SLS) additive manufacturing. Such materials, particularly the ones near the heat-affected zones, go through irreversible chemical degradations originated from thermal oxidations. In the SLS of polyamide 12, despite efforts in understanding the degradation mechanisms of the materials, full modeling of the complex material degradation remains not well understood. In this work, a first-instance kinetic model is proposed considering the effects of both oxygen and lasers to model the material degradation in SLS. By a combined theoretical and experimental mapping of the actual material degradation rates into the oxidation physics and parameter identification, the coefficients of the actual coupled oxygen and laser effects in SLS have been obtained. Through sensitivity analysis, the fitting equations between the sample degradation rates and the oxidation time have been derived. The proposed kinetic model can predict the oxidation rates of pure or mixed materials using two easily available parameters: materials density and oxidation time. Moreover, the results suggest that laser effects are four times stronger than oxygen effects on polyamide 12 degradation. The predicted oxidation matches, on average, 89.53% with the actual SLS degradation rates, in contrast to a 34.48% accuracy from a basic autoxidation model.
Aspects of Sinter-Cracking in Binder Jet 3D Printed Parts
Authors: Carazzone Joseph Reid
Published: April 2022

Binder jet three-dimensional (3D) printing is a scalable, potentially low-cost additive manufacturing route able to process materials not attainable to other techniques, especially nonweldable materials. It relies on postprocess sintering to achieve final properties but encounters problems with distortion and cracking during sintering. The present work seeks to understand how part design geometry and 3D printing build orientation influence cracking during sintering, with the goal of mitigating the problem. In situ monitoring experiments reveal how sinter-cracks initiate and grow in 3D-printed notched panel specimens during densification. Different design geometries and build directions are tested to identify sinter-crack-resistant regimes.
How to Relate the Spreadability of Powder to the Layer Homogeneity in Powder Bed Fusion Additive Manufacturing: A Correlation between Cohesion Assessments and In Situ Printer Measurements
Authors: Neveu Aurélien , Francqui Filip , Lumay Geoffroy
Published: April 2022

Metallic powders are widely used in additive manufacturing processes with, for example, selective laser melting and selective laser sintering. During such operations, successive thin layers of powder are created with a ruler or with a rotating cylinder and then partially sintered or melted with an energy beam. Thin layers of only tens of microns high are usually required to guarantee sufficient vertical resolution as well as good mechanical properties of the final parts. Unfortunately, when the particle size decreases, the cohesiveness increases and the spreadability decreases. Consequently, the spreadability must be good enough to obtain homogenous successive layers. Relating the powder characteristics to spreadability during the recoating process beforehand should provide a more cost-effective way to classify and select the optimal powder and recoating speed combinations. In this study, the flowability of metal powders has been investigated with a rotating drum measurement principle. These measurements have been correlated to the powder spreadability during recoating evaluated directly inside an selective laser melting printer. Results show that the cohesive nature of the powder is a key parameter defining its spreading performance during the recoating.
Microstructural and Mechanical Properties of AISI 4140 Steel Processed by Electron Beam Powder Bed Fusion Analyzed Using Miniature Samples
Authors: Fischer Andreas , Vollmer Malte , Krooß Philipp , Niendorf Thomas
Published: April 2022

The present study reports on the identification of an adequate process window for electron beam powder bed fusion (E-PBF) of AISI 4140 steel. For characterization, only miniature samples were used. It is clearly revealed that, for comparison and evaluation of different conditions, the use of such small samples is absolutely sufficient, even under fatigue loading. The initial E-PBF as-built condition is compared with conventionally heat-treated conditions (i.e., normalized as well as quenched and tempered). Based on the results obtained, the advantages of E-PBF in comparison to other additive manufacturing routes, such as laser powder bed fusion (L-PBF), are discussed. In E-PBF, a very ductile material behavior results from the prevailing process conditions. Furthermore, an as-built condition almost free of residual stresses is established by E-PBF. Microstructural as well as fracture surface analyses were conducted and further supported by three-dimensional defect characterization applying X-ray computed tomography. It was found that the microstructural appearance of the as-built condition is affected most severely by the relatively sluggish cooling after the uppermost layer is finished. Thus, many issues related to L-PBF processing of carbon steels such as AISI 4140 do not prevail in E-PBF. The results obtained by mechanical testing clearly reveal that the remaining process-related volume defects can be compensated to a certain extent in the ductile as-built state. Consequently, the non-heat-treated, as-built condition is characterized by fatigue properties similar to those of post-treated AISI 4140. The latter, however, is characterized by superior strength under monotonic loading.
Microstructure and the Local Mechanical Properties of the 3D Printed Austenitic Stainless Steel at Different Temperatures of the Printer's Chamber: Computer Simulation
Authors: Hosseinzadeh Hamed
Published: April 2022

Metal three-dimensional printing technology is a promising manufacturing method, especially in the case of complex shapes. The quality of the printed product is still a challenging issue for mechanical applications. The anisotropy of the microstructure, imperfections, and residual stress are some of the issues that diminish the mechanical properties of the printed sample. A computer simulation could investigate some technical details. This research has studied the metal three-dimensional printing of austenitic stainless steel to address austenite microstructure and local yield strength at different temperatures of the printer's chamber with computer simulation. Two computational codes were developed in Visual Basic 2015 to simulate the local heating/cooling curve and subsequent austenite grain topology. A stochastic computational code (Cellular Automata) was developed to simulate austenite grain morphology based on calculated thermal history. The Hall-Pitch equation was then used to estimate the yield strength of the printed sample. These codes were used to simulate the effect of the printer's chamber temperature on microstructure and subsequent yield strength. The simulation shows that the austenite grain topology is more columnar at a lower temperature, and the percentage of the equiaxed zone is higher at a higher chamber temperature. Almost a fully equiaxed austenite microstructure will be achieved at an 800°C chamber temperature, but the last printed layer is still columnar and can be removed by cutting. The simulation was used to estimate the grain size of the as-printed sample. The estimated local austenite grain size and the local yield strength in the equiaxed regions ranged from 15 to 30 μm and 270 to 330 MPa at a printer's chamber temperature of 800°C in this simulation.
Open Vector Format for Laser-Based Computer-Aided Manufacturing
Authors: Dirks Sebastian , Collet Andreas , Schleifenbaum Johannes H.
Published: April 2022

Data preparation for additive manufacturing (AM) is a complex process that gained importance as the industrialization of various AM technologies progressed. Lots of effort has been spent on the analysis of three-dimensional (3D) computer-aided design data handling, where the Standard Tessellation Language, or STL, forms a de facto industry standard. To manufacture a given geometry using AM, the 3D data need to be sliced into 2.5D layer-wise data and subsequently into vectors. For AM machines based on multiaxis systems, the G-Code Standard is common for the transfer of already sliced information. Yet, for systems using a galvanometer scanner to change the position of the focus and working point (e.g., laser powder bed fusion), G-Code has several limitations. Proprietary formats are almost exclusively used instead of standards. In this paper, the requirements for a more flexible, open, and technology-independent data format are discussed and analyzed. The data structure, objects, and metadata are deducted from the use case technology laser powder bed fusion. Based on this, an open-source reference implementation of a new format prototype, the Open Vector Format using Google Protocol Buffers technology, is presented and its performance is evaluated in research projects of RWTH Aachen University.
Synthesis, physico-chemical characterization and effect of cobalt doped TiO2 nanoparticle catalyst prepared by sol-gel method
Authors:   Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia, Jothiramalingam R. , Radhika T. ,   C-MET, Center for Materials for Electronics Technology, M.G. Kavu P.O., Athani, Thrissur, Kerala-680581, India, Aswini P. R. ,   Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia, Al-Lohedan H. ,   Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia, Chandrasekaran M. ,   Department of Food Science and Biotechnology, Sejong University, Gwangjingu, Seoul -05006, South Korea, Al-Dhayan D. M. ,   Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia, Appaturi J. N. ,   School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800, Malaysia
Published: April 2022

Anatase TiO2 and Co doped TiO2 were prepared through sol-gel method. Powder XRD pattern confirms the formation of crystalline anatase TiO2 and amorphous Co-TiO2. DR UV-Vis absorbance shows that band gap of TiO2 is reduced to ~ 2.0-2.5 eV upon Co doping suggesting that these materials can absorb in the visible range also. FT-IR spectra confirmed that the Co-TiO2 is similar to that of pure TiO2. Raman spectra exhibit all the bands corresponding to anatase TiO2. However, for Co-TiO2 the peaks corresponding to the presence of Co clusters also appeared. BET surface area of TiO2 is 82 m2 g -1 and is reduced (60-45 m 2 g -1 ) upon Co doping. Nanosize (~20 nm) of the Co doped TiO2 was confirmed from Transmission electron (TE) micrograph studies. Methylene blue dye degradation study have also carried out to exploit the catalytic activity of as prepared materials.
Nurses’ knowledge and practice toward computed tomography safety protocols
Authors: Algamdi Maaidah , Alghamdi Ali , Dauod Khawla , Alatawi Khaleda , Alrawaili Manar , Alhwiti Mawaddah , Albalawi Ablah
Published: April 2022

Objective: to assess nurses’ knowledge and practice toward computed tomography scan safety guidelines. Methods: a cross-sectional study was conducted using a convenience sample of 131 nurses from two government hospitals. Self-designed questionnaire was used to assess nurses’ sociodemographic characteristics, knowledge, and practice. Descriptive analysis was performed to evaluate characteristics, correlations were evaluated using Spearman’s rank correlation coefficient, and the Mann-Whitney U and the Kruskal-Wallis H tests were used to compare the mean ranks of knowledge and practice scores. Results: most respondents were female (91.6%), were aged 20–29 years (57.3%), and had bachelor’s degrees (74%). Knowledge and practice levels were 58% and 78.9% respectively. A positive correlation between knowledge and practice was observed among nurses (r=0.684, p<0.001). No statistically significant differences were observed between sociodemographic characteristics and knowledge and practice scores. Conclusion: nurses showed adequate level of practice toward computed tomography scan safety preparations while their knowledge level was deficient. Contributions to practice: this study informs the importance of knowledge in guiding nursing practice toward appropriate computed tomography scan safety measures.
The state of the art on hypodermoclysis in child health care: scoping review
Authors: Souza Isabella Pavarine de , Silva Maria Paula Custódio , Oliveira Ana Letícia Ribeiro , Souza Giselle Vieira de , Rocha Jesislei Bonolo do Amaral , Contim Divanice
Published: April 2022

Objective: to mapping the evidence on hypodermoclysis in child health care. Methods: this is a scope review, with a search in Medical Literature Analysis and Retrieval System Online, Latin American and Caribbean Health Sciences Literature, Cochrane Library, Cumulative Index to Nursing and Allied Health Literature, Scopus Elsevier, Web of Science and Embase. Studies published in Portuguese, English and Spanish were included, with no time cut. Results: a total of 11 studies were analyzed, with a predominance of literature reviews. The main themes were: use of recombinant human hyaluronidase as a facilitator of subcutaneous absorption; comparison between subcutaneous and intravenous rehydration; advantages of hypodermoclysis; patient pain and puncture attempts. Conclusion: this study allowed mapping the scientific evidence on hypodermoclysis, revealing it to be a viable and valid alternative for administering medications in children. Contributions to practice: the use of the technique can bring benefits and provides evidence to indicate and apply it in child care.
The Guardian Ancestors. Burials at Bronze Age fortified Sites in the Adriatic Area: Coppa Nevigata and the Istrian Hillforts
Authors: Recchia Giulia , Cazella Alberto
Published: April 2022

Around the mid-second millennium BC, some inhumations and disarticulated bones were buried in the area of the fortification lines at the Coppa Nevigata settlement (northern Apulia). This funerary custom appears to be anomalous in the context of Bronze Age southern Italy. On the other hand, such a burial location near to a fortification wall mirrors the funerary evidence from Bronze Age hillforts (castellieri/gradine) in Istria, a region that indeed had close relationships with northern Apulia. Evidence from other European regions is also taken into account, in order to evaluate to what extent this phenomenon was a distinctive trait pointing to interaction between the south-western and north-eastern Adriatic and what their nature was. European contexts offer only generic similarities, whereas the consistency of funerary practices at settlements in the Adriaticarea, based on a close association with defensive lines, appears to be far from random.
Rezultati rekognosciranja gradinskog naselja Brdo-Stine kod Žrnova na otoku Korčuli
Authors: Radić Dinko , Borzić Igor
Published: April 2022

Kontinuirani rad na arheološkoj topografiji Korčule u novije je vrijeme rezultirao ubiciranjem željeznodobnog naselja na lokaciji Brdo-Stine u Žrnovu na istočnom kraju otoka. Višekratnim rekognosciranjem lokaliteta okvirno su određeni njegov prostorni opseg, osnovne organizacijske sastavnice, kao i karakteri pokretnih nalaza, a što sve skupa svjedoči iznimnom arheološkom potencijalu. Predstavljanjem položaja naselja te tipokronološkim određenjem sakupljenih ulomaka metalnih (željezna zgura), kamenih (brusevi, žrvnjevi, nakovnji) te keramičkih nalaza (krovne ploče, kalupi?, amfore i pitosi) naselje je preliminarno postavljeno u okvire kasnog željeznog doba/helenizma prostora na kojem dolazi do vrlo intenzivnog preslojavanja indigenih te helenističkorimskih sastavnica.
Religijske medaljice iz sv. Dominika u Zadru
Authors: Vujević Dario , Gusar Karla
Published: April 2022

U radu se analiziraju nalazi religijskih medaljica pronađenih istraživanjima unutrašnjosti crkve sv. Dominika u Zadru koje je 2016. godine provodio Odjel za arheologiju Sveučilišta u Zadru. Istraživanjem crkve otkrivene su novovjekovne zidane grobnice igrobovi bez arhitekture. U njima je između ostalih nalaza pronađeno i 29 medaljica raznih svetaca, među kojima su najbrojnije one s prikazom Gospe Loretske. Sve medaljice potječu iz 17. i 18. stoljeća.
SARS-CoV-2 associated liver injury: a six-month follow-up analysis of liver function recovery
Authors: Roman Adina , Moldovan Septimiu , Stoian Mircea , Tilea Brindusa , Dobru Daniela
Published: April 2022

SARS-CoV-2 associated liver injury: a six-month follow-up analysis of liver function recovery

 

 

Background and aims. SARS-CoV-2 infection has raised the interest in clinical and paraclinical research worldwide, representing a public health issue since the beginning of 2020. Studies have established the variable, unpredictable character of COVID-19. Our main objective was to assess the liver function of patients without pre-existing liver disease, diagnosed with SARS-CoV-2 associated liver injury in a 6-month follow-up study after discharge.

Methods. We conducted a prospective paraclinical and imagistic follow-up study between 1st September 2020 and 30th April 2021 on patients without pre-existing liver disease previously diagnosed with SARS-CoV-2 associated liver injury who had been admitted in Mures County Clinical Hospital, Targu Mures, Romania. We followed up patients ’clinical and paraclinical characteristics at index COVID-19 hospitalization and at T1 (6-month follow-up visit).

Results. We performed abdominal ultrasonography and laboratory examinations in 78 patients (mean age 45±10 years) hospitalized 6 months earlier for symptomatic COVID-19, with a male:female ratio of 1.3:1.

Thirty patients (38.46%) were discharged at index COVID-19 hospitalization with abnormal liver function tests, while the rest presented paraclinical normalization at discharge and mean duration of liver injury of approximately 7 days. Follow-up examination revealed abnormal liver function tests in twenty-four patients, most of which presented with mild liver injury. All patients with severe COVID-19 at index hospitalization present with abnormal liver function tests at follow-up examination.

Conclusions. By performing a complete clinical and paraclinical 6-month follow-up study, with a specific focus on 34.6% of patients in which we noted a persistence of liver function tests abnormality, we could analyse a possible long-term effect of SARS-CoV-2 infection over liver function and also raise awareness of liver function tests monitoring and therapeutic management in post COVID-19 patients. Long-term follow-up studies of COVID-19 multi-organ sequelae are therefore mandatory in order to improve the practice of consultant gastroenterologists.
Predefined-time synchronization of 5D Hindmarsh–Rose neuron networks via backstepping design and application in secure communication
Authors: Lin Lixiong
Published: April 2022

In this paper, the fast synchronization problem of 5D Hindmarsh–Rose neuron networks is studied. Firstly, the global predefined-time stability of a class of nonlinear dynamical systems is investigated under the complete beta function. Then an active controller via backstepping design is proposed to achieve predefined-time synchronization of two 5D Hindmarsh–Rose neuron networks in which the synchronization time of each state variable of the master-slave 5D Hindmarsh–Rose neuron networks is different and can be defined in advance, respectively. To show the applicability of the obtained theoretical results, the designed predefined-time backstepping controller is applied to secure communication to realize asynchronous communication of multiple different messages. Three numerical simulations are provided to validate the theoretical results.
Effects of Joule heating, thermal radiation on MHD pulsating flow of a couple stress hybrid nanofluid in a permeable channel
Authors: Rajamani Somasundaram , Subramanyam Reddy Anala
Published: April 2022

The current work deals with the pulsatile hydromagnetic flow of blood-based couple stress hybrid nanofluid in a porous channel. For hybrid nanofluid, the fusion of gold (Au) and copper oxide (CuO) nanoparticles are suspended to the blood (base fluid). In this model, the employment of viscous dissipation, radiative heat, and Ohmic heating is incorporated. The governing flow equations (set of partial differential equations) are modernized to set of ordinary differential equations by using the perturbation technique. The nondimensional governing equations are solved by adopting the shooting procedure with the help of the Runge–Kutta fourth-order approach. Temperature distributions of hybrid nanofluid and conventional mono nanofluids are portrayed via pictorial results to claim that the hybrid nanofluid has better temperature distribution than mono nanofluids. Temperature is raising for the magnifying viscous dissipation, whereas the reverse behavior can be found with a rise in couple stress parameter. The heat transfer rate is getting high for the higher values of the Eckert number, and the same behavior is noticed with the uplifting magnetic field.
Differences in teachers' experiences for educational continuity between kindergarten and elementary school and their perceptions of teacher-cooperation: From The perspective of The Eco-Dynamic Model of Transition to school
Authors: Ji Hye-Won , Chae Jin-Young
Published: April 2022

Hye-Won Ji, Jin-Young Chae
Valve-in-valve Transcatheter Aortic Valve Replacement for Failed Surgical Valves and Adjunctive Therapies
Authors: Perdoncin Emily , Paone Gaetano , Byku Isida
Published: April 2022

While redo surgical aortic valve replacement has traditionally been the gold standard for the treatment of failed surgical valves, valve-in-valve (ViV) transcatheter aortic valve replacement (TAVR) has arisen as a viable, less invasive option with the potential for improved short-term morbidity and mortality. Retrospective registry data regarding ViV TAVR outcomes have been encouraging, with excellent 1-year mortality, and sustained valve performance and quality of life improvement out to 3 years. Operators must be comfortable with CT analysis for procedural planning, and be able to identify and troubleshoot patients who are at risk for coronary obstruction and patient prosthesis mismatch. The authors provide a review of clinical outcomes associated with ViV TAVR, procedural planning recommendations, and strategies to overcome technical challenges that can occur during ViV TAVR.
Stent Grafting for Aortoiliac Occlusive Disease: Review of the VBX FLEX Study
Authors: Mann Nolan , El Sayed Hosam , Panneton Jean
Published: April 2022

Endovascular treatment has become an accepted method in the treatment of aortoiliac occlusive disease. Bare metal stents have been used in the treatment of aortoiliac disease since the early 1990s. More recently, the use of covered stent grafts in the aortoiliac segment has shown clinical benefit in terms of patency, freedom from reintervention and quality of life. The VBX FLEX study evaluated the safety and efficacy of the Gore VBX stent graft for use in the aortoiliac segment. The early and mid-term data on the Gore VBX stent graft have shown it to be a safe device for use in the treatment of aortoiliac occlusive disease. This review examines the use of stents in aortoiliac occlusive disease with specific focus on the VBX FLEX Study.
Реліктова ценопопуляція Ulmus glabra Huds. у Покутських Карпатах
Authors: Plichtyak Petro , Woźniak Andrzej , Soroka Myroslava , Onyskіv Andriy
Published: April 2022

У Покутських Карпатах виявлено ценопопуляцію Ulmus glabra Huds. із 15 дерев віком близько 100 років, які пережили епідемію «голландської хвороби» у минулому столітті. Унікальна популяція сформувалася на південному схилі лісового потоку у глибокій ущелині, зайнятій фітоценозами трьох лісових асоціацій рослинності, які змінюють одна одну по мірі віддалення від водного дзеркала. Встановлено, що в умовах лісових ярів панує специфічний мікроклімат і формуються фітоценози гігрофільної рослинності, які належать до рідкісних угруповань Європи згідно Директиви ЄС 92/43/EEC: Stellario nemorum-Alnetum glutinosae, Ulmo glabrae-Aceretum pseudoplatani і Dentario glandulosae-Fagetum. Великі екземпляри Ulmus glabra збереглися лише на першій терасі у прирусловій частині водного потоку, утворивши наступну за клейковільховими лісами смугу у висотному градієнті яружних лісів. Для вивчення особливостей лісів, у яких ростуть великовікові дерева стійкої до «голландської хвороби» форми Ulmus glabra, досліджено їхній видовий склад і фітосоціологічні характеристики на основі еколого-флористичної класифікації та методу J. Braun-Blanquet (1964). Синтаксономічний аналіз засвідчив, що ценопопуляція Ulmus glabra у Покутських Карпатах має реліктовий характер, оскільки є залишком давніх вологих лісів союзу Alno-Ulmion підсоюзу Alnenion glutinoso-incanae, які внаслідок пониження рівня ґрунтових вод і наступних динамічних змін рослинності поступово трансформуються у ліси союзу Tilio platyphyllis-Acerion pseudoplatani.
Структура соснових деревостанів Придонецького Степу України
Authors: Pasternak Volodymyr P. , Prihodko Olexiy B. , Girs Olexandr A.
Published: April 2022

Здійснено аналіз поширення Pinus sylvestris L. у лісовому фонді регіону дослідження та встановлено лісівничо-таксаційні показники соснових деревостанів. Характеристику соснових деревостанів базових підприємств здійснено за типами лісу, повнотою та продуктивністю. Розглянуто таксаційну будову соснових деревостанів, проаналізовано розподіл дерев Pinus sylvestris за діаметром і класами Крафта. За результатами кореляційного аналізу встановлено тісний зв'язок між діаметром, максимальним і мінімальним редукційними числами; дещо меншої тісноти зв'язок існує між віком і діаметром та максимальним і мінімальним редукційними числами. Розраховано моделі мінливості діаметра, відношення мінливості ділової частини до загальної мінливості діаметра деревостану з урахуванням мінімального та максимального діаметрів модальних деревостанів. Розподіл дерев за діаметром характеризується переважно гостроверхою кривою з правосторонньою асиметрією. Середні значення асиметрії розподілів становлять 0,33; ексцес – -0,08. Розрахунки моделей розподілу стовбурів сосни за діаметром показали, що β-розподіл є оптимальним для цього об’єкта дослідження. Встановлено зв’язок між часткою ділових стовбурів і віком модальних соснових деревостанів. За результатами порівняння нормативів розподілу, розроблених для соснових деревостанів Придонецького Степу України, з даними для Полісся встановлено більшу мінливість за діаметром останніх, що зумовлено, насамперед, лісорослинними умовами регіону та режимом господарювання.

Побудовано таблиці динаміки товарної структури модальних соснових деревостанів з урахуванням розподілу об’ємів ділових стовбурів за класами і підкласами товщини, узгодженими з європейськими підходами щодо таксації круглих лісоматеріалів. Наведені нормативи розподілу дерев за діаметрами та динаміка товарної структури модальних соснових насаджень з урахуванням розподілу ділової деревини за класами діаметрів дають змогу підвищити точність визначення показників соснових насаджень Придонецького Степу.
Estudo da integral definida por meio de problemas interdisciplinares do Cálculo com a Físico-Química
Authors: RACHELLI JANICE , BOLZAN DENARDI VÂNIA , Bisognin Vanilde
Published: April 2022

Esta pesquisa tem por objetivo investigar como a resolução de problemas, com base na interdisciplinaridade entre o Cálculo e a Físico-Química, contribui para o ensino e aprendizagem do conceito de integral definida. Relatamos, neste artigo, uma experiência desenvolvida junto a 25 estudantes do curso de Engenharia Química de uma instituição de ensino superior pública e federal do Rio Grande do Sul, matriculados na disciplina de Cálculo A. A Resolução de Problemas de George Polya foi considerada como aporte teórico e metodológico. O estudo teve uma abordagem qualitativa em que as produções dos alunos foram analisadas e organizadas em duas categorias: conhecimentos mobilizados pelos alunos em relação ao conceito de integral definida e dificuldades apresentadas por eles na resolução dos problemas. Os resultados evidenciaram que os problemas propostos contribuíram para a compreensão do conceito de integral definida e da importância dos conhecimentos da Matemática para entender os fenômenos e as teorias associadas à formação profissional, tornando o conteúdo mais significativo para o aluno e despertando o interesse e uma participação ativa nas aulas de Cálculo.
Palavras-chave: Integral definida; resolução de problemas; interdisciplinaridade; Cálculo; Físico-Química.
A benign entity – cerebral multinodular and vacuolating neuronal tumor
Authors:   Department of Radiology, University of Medical Sciences, Prof Dr Cemil Tascıoglu City Hospital, İstanbul, Turkey, Kış Naciye , Erok Berrin ,   Department of Radiology, University of Medical Sciences, Prof Dr Cemil Tascıoglu City Hospital, İstanbul, Turkey, Kılıç Harun ,   Department of Radiology, University of Medical Sciences, Prof Dr Cemil Tascıoglu City Hospital, İstanbul, Turkey, Önder Hakan ,   Department of Radiology, University of Medical Sciences, Prof Dr Cemil Tascıoglu City Hospital, İstanbul, Turkey
Published: April 2022

Introduction and aim. Multinodular and vacuolating neuronal tumor (MVNT) of the cerebrum is a rare benign, mixed glial/ neuronal lesion which has been included in the recent (2016) World Health Organization (WHO) Classification of the central nervous system tumors.Most of the reported cases are remarkable with adult onset seizure in the literature.They can also be found incidentally in nonepilepsy patients with or without headache We aimed to present this unique entity with its typical magnetic resonance imaging (MRI) features. Description of the case. A 21-year old man presented with complaint of headache that increased in frequency within the last few months.No relevant seizure or any other signs of note.He was diagnosed with MVNT by imaging andstarted to be followed- up.The repeat MRI 6 months later showed no interval changes. Conclusion. Clinicians should be aware of that it is a do not touch lesion in asymptomatic patients with no need for biopsy or surgery and follow up imaging is sufficient when presented with the typical MRI manifestations. Surgical resection may be required for seizure control and was reported in few cases with no tumoral regrowth in the literature.
Healthcare services granted to patients with diagnosed acute initial or subsequent myocardial infarction in the Silesian voivodeship (Poland)
Authors:   Department of Statistics, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, Katowice, Poland, Choręza Piotr , Filipecki Artur ,   1st Department of Cardiology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland, Kowalska Małgorzata ,   Department of Epidemiology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland, Owczarek Aleksander J. ,   Health Promotion and Obesity Management Unit, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
Published: April 2022

Introduction and aim. Cardiovascular diseases remains the leading cause of death in most of devoloped societies, including Poland. The study aimed to assess the changes in the number, duration, and costs of hospitalizations due to myocardial infarction in Silesian voivodeship (Poland) in 2009-2014. Material and methods. Data were obtained from the Silesian Voivodeship Branch of the National Health Fund. The number, costs, and duration of healthcare services granted during an inpatient hospital stay to patients with acute initial or subsequent myocardial infarction in 2009–2014 were processed and analyzed quarterly for the whole Silesian voivodeship and its subregions. Results. From 54826 patients aged 66±12, the majority were males (62.3%) and 63.4% of 80866 hospitalizations were granted to them. We observed a decreasing trend for the total number of healthcare services granted in 2009–2014 that varied depending on the subregion. Simultaneously, we found that in most subregions the costs of services and the number of invasive services increased over time. We observed that treating patients above 80 years with acute initial or subsequent myocardial infarction generated lower costs of hospitalization but was extended in time. Conclusion. Increased number and costs and accompanying reduced duration of hospitalizations granted in 2009–2014, especially in the range of invasive cardiology and cardiac surgery, results from implementing international guidelines and recommendations for acute myocardial infarction procedures. Lower cost and extended time of hospitalization for patients older than 80 years most likely result from using conservative (non-invasive) methods of treatment.