bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mechanical and thermal properties of rigid PVC and graphene nanocomposites obtained by melt–mixing
Authors: Wilczewski Sławomir , Skórczewska Katarzyna , Tomaszewska Jolanta , Lewandowski Krzysztof , Şentürk Ömer Faruk 
Published: April 2024

The effect of graphene (0.01, 0.1, 0.5 and 1 wt%) on the mechanical properties and thermal stability of rigid PVC was investigated. The morphology and thermal properties were analyzed by scanning electron microscopy (SEM) and thermogravimetric thermal analysis (TGA). Additionally, tensile properties, impact strength and hardness were determined. It was found that the addition of graphene can increase the impact strength and hardness and extend the thermal stability time of PVC.
The humanism of the other in sociolinguistic ethnography
Authors: Creese Angela 
Published: April 2024

Abstract
This article describes the social and ethical responsibility researchers experience in undertaking ethnographic research under conditions of neoliberalism. It acknowledges the hierarchical nature of working in large ethnographic teams in which a mixture of employment contracts and statuses exist. Drawing on relational ethics (Levinas 2003. Humanism of the Other. Champaign: University of Illinois Press.), and its attention to the humanizing potential of difference, the paper describes researchers’ propensity for relationality in the face of competitive neoliberalism. It presents a case study of a large research team and investigates the use of research vignettes to represent and relate in difference. Subjectivity is theorized not in terms of identity but rather through alterity and opacity arguing this direction opens up social and political alliances (Butler 2005. Giving an Account of Oneself. New York: Fordham University Press.). Specifically, the paper suggests the research vignette is a genre well suited to documenting the way humans live in difference, illustrating how the researcher yields to the face of the Other in field work encounters. As a form the research vignette is said to bridge the aesthetic and the scientific, demanding of its reader an engagement with a variety of interpretations. Further, the vignette is considered for its methodological potential in creating a dialogic relational space for research teams within the neoliberal university.
Phonetic smart clothing design based on gender awareness education for preschoolers
Authors: Tu Chenchen , Niu Li , Cui Rongrong , Liu Kaixuan 
Published: April 2024

Abstract
Given problems such as the late start of gender awareness education in China, the gender blurring in preschooler’s clothing, the lack of integrating gender awareness elements into preschooler’s clothing, etc., using children’s sensory functions such as vision, touch, and hearing, a phonetic intelligence module with alarm sounds and warning words is implanted into special parts of children’s clothing. When children gently touch the part, it can make a sound. This kind of smart clothing for preschoolers, which is both interesting and educational, enables children to understand gender knowledge more intuitively, have a certain gender awareness to better protect their private parts of the body, and develop a correct view of gender roles and a sound personality.
Design of MIMO PI-compensators without exponentially unstable poles
Authors: Hippe Peter 
Published: April 2024

Abstract
There is a class of systems that can only be stabilized by unstable compensators. However, for most practical systems suitable for use with linear regulators, this is possible with stable ones. To avoid exponentially unstable results in the design of pole placing PI-compensators it is of crucial importance to consider the position of the transmission zeros. This also has a favourable effect on the disturbance rejection. In multi-input multi-output (MIMO) systems, however, not only the zero position but also the zero direction is of importance. In this paper, a design method for multivariable PI-controllers in the time- and in the frequency-domains is presented which helps to avoid the occurrence of exponentially unstable controllers. A modified design method for multivariable PI-controllers, recently published in this journal, facilitates the procedure.
KI-basierte Regelungskonzepte zur automatischen Spurregelung von Flurförderzeugen
Authors: Sauer Timm , Zindler Klaus , Jumar Ulrich 
Published: April 2024

Zusammenfassung
In diesem Beitrag werden zwei KI-basierte Regelungskonzepte zur automatischen Spurführung von Flurförderzeugen (FFZ) einer heterogenen Logistikflotte vorgestellt. Während die modellfreien Verfahren des bestärkenden Lernens für diese Anwendung als Vertreter der direkten neuronalen Regelung vorgestellt werden, lässt sich das zweite Regelungskonzept in die Klasse der indirekten neuronalen Regelungen einordnen. Beide Konzepte zeichnen sich dadurch aus, dass sie dazu in der Lage sind, die Reglerparameter an verschiedene Varianten von FFZ anzupassen sowie vorab bekanntes Wissen bezüglich des Regelstreckenverhaltens beim Entwurf der Regler gezielt zu berücksichtigen.
Local Bayesian optimization for controller tuning with crash constraints
Authors: von Rohr Alexander , Stenger David , Scheurenberg Dominik , Trimpe Sebastian 
Published: April 2024

Abstract
Controller tuning is crucial for closed-loop performance but often involves manual adjustments. Although Bayesian optimization (BO) has been established as a data-efficient method for automated tuning, applying it to large and high-dimensional search spaces remains challenging. We extend a recently proposed local variant of BO to include crash constraints, where the controller can only be successfully evaluated in an a-priori unknown feasible region. We demonstrate the efficiency of the proposed method through simulations and hardware experiments. Our findings showcase the potential of local BO to enhance controller performance and reduce the time and resources necessary for tuning.
Tensile assessment of woven CFRP using finite element method: A benchmarking and preliminary study for thin-walled structure application
Authors: Fajri Aprianur , Suryanto Suryanto , Adiputra Ristiyanto , Prabowo Aditya Rio , Tjahjana Dominicus Danardono Dwi Prija , Yaningsih Indri , Laksono Fajar Budi , Nurrohmad Abian , Nugroho Afid , Wandono Fajar Ari , Budiantoro Poki Agung , Ramayanti Sri , Soedjarwo Moedji 
Published: April 2024

Abstract
Carbon-fiber-reinforced polymers (CFRPs) are a composite material popular for thin-walled structure applications because of their advantages over other materials. In this study, numerical simulation analysis based on the finite-element method to identify the tensile behavior of CFRP woven material has been carried out. The method used has been verified and validated using a benchmarking procedure with the results of previous research. Errors in the simulation results are less than 10%, indicating a valid method that can be used for further research. The stress–strain distribution of each layer, the effect of ply orientation on tensile strength, the comparison of failure criteria used, and the comparison of several types of reinforcements often used have been investigated. The results showed that the characteristics of each inner layer received tensile loading visualized in the form of stress strains. Choosing the right layer angle on CFRP woven can affect the performance and strength of the material. Failure criteria that are appropriate to specific application conditions are important. Puck criteria can be used for simple applications, which require only the analysis of the main stresses in the material. Tsai–Hill and Tsai–Wu criteria can provide more accurate predictions and are better suited for loading conditions and more complex material types. Carbon fiber has better characteristics when compared to S-glass and E-glass.
Preparation of HTV silicone rubber with hydrophobic–uvioresistant composite coating and the aging research
Authors: Lei Mingdong , Li Ziyou , Gan Qiang , Zhou Weizhen , Li Qiang 
Published: April 2024

Abstract
A series of high temperature vulcanization (HTV) silicone rubbers with TiO2 ultraviolet (UV) shielding layer and polytetrafluoroethylene (PTFE) hydrophobic layer were prepared via stepwise spray method. It was found that the hydrophobic PTFE liquid emulsion (PTFEL) could steadily and tightly adhere to the HTV silicone rubber surface by spray method after pre-mixing with permanent room temperature vulcanized (PRTV) silicone rubber during the first step spray. And the subsequent introduction of TiO2 and PTEF solid powder (PTFES) could improve the UV shielding ability and further increase the hydrophobicity of HTV silicone rubber during the second step spray after pre-blending. The accelerated hygrothermal aging process and UV aging process were used to analyze the effect of coating structure and composition on anti-aging performance. And the results indicated that the HTV silicone rubber with PRTV-PTFEL/TiO2-PTFES composite coating showed a favorable UV shielding ability and also possessed an excellent hydrophobicity due to the introduction of low surface energy matter and the building of coarse micro-nano hydrophobic structure. After the aging process, the cracked micro-surface, increased water absorption and decreased mechanical property were displayed for the neat HTV silicone rubber, and these aging phenomena got dramatically improved for PRTV-PTFEL/TiO2-PTFES coating HTV silicone rubber.
Spontaneous duodenocutaneous fistula: a rare presentation of perforated duodenal ulcer
Authors: Barreto Isabel , Kohler Arnold , Fahrner René 
Published: April 2024

Abstract

Objectives
Fistula formation between the duodenum and the skin of the anterior abdominal wall is a rare complication and reported most often following surgery. To the best of our knowledge, the development of a spontaneous duodenocutaneous fistula in association with duodenal ulcer has only been reported once.

Case presentation
A 52-year-old female patient presented at the emergency department with a painful ulcer and erythema on the right abdominal wall. On admission, she was in extremely poor general and nutritional condition. Laboratory analysis revealed inflammation. An empiric antibiotic therapy was initiated; parenteral nutrition, fluid, and electrolyte resuscitation were started. An enterocutaneous fistula was postulated and confirmed by endoscopy identifying a perforated duodenal ulcer. Surgery was not a valuable option and a Foley catheter was inserted through the fistula. During further endoscopic interventions, the Foley catheter was first replaced by a jejunal tube and later by a percutaneous endoscopic gastrostomy with a jejunal limb for enteral nutrition. The fistula output decreased, the local infection was controlled and the nutritional status improved.

Conclusions
Three months later the fistula was closed and the gastrostomy tube was removed. After 2 years the patient was in good general and nutritional condition.
The crystal structure of (2-diphenylphosphanylphenyl) 2-[7-(dimethylamino)-2-oxochromen-4-yl]acetate, C31H26NO4P
Authors: Mamat Constantin , Köckerling Martin 
Published: April 2024

Abstract
C31H26NO4P, monoclinic, P21/c (no. 14), a = 16.3835(2) Å, b = 14.5755(2) Å, c = 10.5388(2) Å, β = 95.694(1)°, V = 2504.22(7) Å3, Z = 4, Rgt
(F) = 0.0435, wRref
(F
2) = 0.1310, T = 173(2) K.
Crystal structure of dimethyl (R)-2-(3-(1-phenylethyl)thioureido)-[1,1′-biphenyl]-4,4′-dicarboxylate, C25H24N2O4S
Authors: Chen Yi , Shi Da-Bin 
Published: April 2024

Abstract
C25H24N2O4S, orthorhombic, P212121 (no. 19), a = 6.8049(5) Å, b = 12.2546(8) Å, c = 26.8916(18) Å, V = 2242.5(3) Å3, Z = 4, R
gt(F) = 0.0581, wR
ref(F
2) = 0.1560, T = 100 K.
Sonic Epistemologies: Confrontations with the Invisible
Authors: Voegelin Salomé 
Published: April 2024

Abstract
With reference to Steven Feld’s “acoustemology,” his epistemology of sounding and listening, developed in the Bosavi Rainforest in Papua New Guinea, where the trees are too dense to afford a distant view and meaning has to be found up close, on the body with other human and more-than-human bodies, this essay deliberates how sound knows in entanglements and from the in-between: in a being with as a knowing with rather than from a distance. In this way, this essay, from the densities of the rainforest, critiques Western knowledge and its reliance on visual categories, straight lines, and universalising principles that pretend objectivity and a distant view. Instead, it turns to the relational indivisibility of sound that lets us hear interdependencies and confronts us with the invisible of which we are part. In conclusion, it proposes that sound studies as applied, transversal studies enable such a paradigm shift that at once reveals what hegemonic knowledge strands exclude and invites a different dialogue from the in-between of everything.
Characterization techniques for carbon-based adsorbents and carbon composites
Authors: Danya Uthaman , Sagayaraj Chinnappan , Yaazhini Jagadeesan , Ramachandran Balaji , Aravind Jeyaseelan , Muthukumaran Peraman 
Published: April 2024

Abstract
Adsorption processes are crucial in various applications, especially water and wastewater treatment. The research is focused on improving and developing adsorbent materials. An in-depth evaluation of a recently suggested adsorbent is essential to determine its characteristics, confirm its suitability, and understand its effectiveness in the intended process. Various approaches can be engaged to collect multiple physico-chemical data, with the selection of the methodology contingent on the substance under investigation and the instruments at hand. The accessible procedures include, FTIR, Raman, XPS, EDX, XRD, SEM/FESEM, TEM, AFM, VSM, DLS, and thermoanalytical techniques (TGA, DSC). These methods aid in identifying, locating, and quantifying chemical components. They also enable the analysis of the structure, topography, morphology, magnetic properties, and size, as well as other physical characteristics of materials. This information is valuable for assessing the manufacturing and modification of adsorbent materials and studying the adsorption process by examining the interactions between the adsorbent and the adsorbate. This work aims to offer an inclusive resource for investigators exploring adsorbent resources. It attempts to help them choose the most suitable characterization methods according to their specific needs.
Sociolinguistics and Universalism
Authors: Bouchard Jérémie 
Published: April 2024

Abstract
The discourse on linguistic diversity, relativity and pluralism is currently dominant in sociolinguistics. By extension, arguments for universalism are currently unfashionable in the field, particularly within its interpretivist strand. This paper claims that interpretivist sociolinguistics promotes conflicting, often lukewarm, and at times antagonistic views on universalism as a core emancipatory value. In response, the argument is made that appreciating universalism requires a layered social ontology afforded by critical realism. To build this critique, the paper first surveys how universalism has been neglected by prominent interpretivist sociolinguists to date. It then provides a conceptual account of critical realism’s layered social ontology and its relation to sociolinguistics. A discussion on the nature and importance of values in social science and sociolinguistics follows. Finally, the paper discusses universalism as a core emancipatory value, its critique, and its relation to sociolinguistics.
Identification and Interpretation of Melt Pool Shapes in Laser Powder Bed Fusion with Machine Learning
Authors: Sato Matthew M. , Wong Vivian W. H. , Yeung Ho , Witherell Paul , Law Kincho H. 
Published: April 2024

Abstract
Laser powder bed fusion (LPBF) is a popular additive manufacturing process with many advantages compared with traditional (subtractive) manufacturing. However, ensuring the quality of LPBF parts remains a challenge in the manufacturing industry. This work proposes the use of unsupervised learning, specifically, the k-means clustering method, to identify unique melt pool shapes produced during LPBF manufacturing. Melt pools are a key process signature in LPBF and can assist in the evaluation of process quality. k-means is employed multiple times sequentially to produce clusters of melt pools, and the silhouette value is used to identify the optimal number of clusters. The clusters produced by k-means are used as labels to train a deep neural network to classify the melt pool shapes. By inputting the melt pool image and the corresponding LPBF machine process parameters into the neural network, the neural network identifies the melt pool shape to aid human analysis and provide insight into part quality. The trained neural network is interpreted using explainable artificial intelligence (XAI) methods to investigate the relationships between process parameters and the melt pool shape. Using layer-wise relevance propagation, the process parameters that most significantly influence the melt pool shapes are identified. The relationship between process parameters and melt pool shapes can be useful for selecting the process parameters to produce the desired melt pool shapes. In summary, this study describes an approach that combines unsupervised machine learning and XAI methods to effectively enable the analysis and interpretation of melt pools.
The use of teledentistry and Artificial Intelligence (AI) in dental and oral health services for the elderly in the era of the covid-19 pandemic: A systematic review
Authors: Thalib Bahruddin , Nurrahma Rifaat , Asmawati  , Thalib Alqarama M. , Taufik Mohammad NF. 
Published: April 2024

Objective: This paper aims to determine the use of teledentistry and AI in the elderly to maintain the health of their oral cavity and teeth during the COVID-19 pandemic.
Methods: Technology in dentistry today is developing very rapidly, improving the quality of dental and oral health services. During the pandemic, the elderly has concerns about Covid-19 contamination when they have to see a dentist. Their situation has led to discussions and efforts to use teledentistry and Artificial intelligence to facilitate services and care for the elderly during the pandemic.
Results: Teledentistry is used as a medium for consultation, diagnosis, referral system, treatment, and follow-up. While Artificial Intelligence (AI) has been used in diagnostic, patient data management, restoration, and CAD/CAM-based denture manufacture, detecting periodontal disease, and dental radiology.
Conclusion: Teledentistry and AI can be a promising alternative in dental and oral health services to reduce anxiety and fear of contamination with Covid-19. The technologies make it easier for health workers, especially dentists, to maintain and improve the quality of life of the elderly during the pandemic.
The differences in severity of temporomandibular joint disorder before and after orthognathic surgery
Authors: Hardini Akmalia , Sjamsudin Endang , Yuza Abel T. , Sadputranto Seto A. 
Published: April 2024

Objective: The aim of this study was to analyze the differences in the severity of Temporomandibular Joint (TMJ) disorders before and after orthognathic surgery.
Material and Methods: This type of research is analytical observation with 10 subjects, who will perform orthognathic surgery at the Oral and Maxillofacial Surgery section in the Dental and Oral Hospital and Hasan Sadikin Hospital, then perform TMJ clinical examination with the Helkimo index, filling out the Fonseca questionnaire before and after orthognathic surgery and Cone Beam Computed Tomography (CBCT) photos 7 months after orthognathic surgery. Statistical analysis using paired data test (Wilcoxon test).
Results: The results of the paired data test calculation showed that there was a difference in the degree of severity before and after surgery which was statistically significant with results-p <0.05 where after surgery there was a decrease in the severity of TMJ with using the Helkimo index and the Fonseca questionnaire.
Conclusion: Orthognathic surgery can reduce the severity of temporomandibular joint disorders, assessed by Helkimo index and Fonseca questionnaire.
The relationship between sociodemographic characteristics of urban and rural areas with oral health service accessibility in Indonesia
Authors: Akbar Fuad H. , Pasiga Burhanuddin D. , Samad Rasmidar , Anwar Ayub I. , Djamaluddin Nursyamsi , Qalbiyani Dewi 
Published: April 2024

Objective: the authors are interested in conducting a survey on the relationship of sociodemographic characteristics of urban and rural areas with the accessibility of OHS in Pinrang Districts, South Sulawesi, Indonesia in 2019.
Material and Methods: This study used a qualitative approach by distributing questionnaires to adult subjects aged 18 years and above in Pinrang Districts, South Sulawesi during January 29th till February 1st, 2019. The location was divided according to the Pilot Pathfinder Survey method. The Urban area is represented by the Watang Sawitto Sub-District and the rural area is represented by the Suppa Sub-District.
Results: The subjects who participated in this study were 298 people, an urban population (UP) was 184 people (61.74%) and a rural population (RP) was 114 people (38.26%). There is a significant relationship between sociodemographic characteristics and visits to oral health services (p=0.045). Community Health Center is the main choice if the subject has dental health problems.
Conclusion: The main reason for visiting the oral health service facilities of the urban and rural population is for a tooth filling. Expensive cost and remote locations are the main reasons for not visiting oral health service facilities.
The effectiveness of watermelon rind extracts waste (citrullus lanatus l.) in removing free radical in oral leukoplakia patients
Authors: Khaera Shafira N. , Zaizafun Ainiyyah F. , Anisa Andi N. , Mude Acing H. 
Published: April 2024

Objective: Therefore, this study will reveal the effectiveness of watermelon rind extract waste in inhibiting free radicals in patients with oral leukoplakia.
Material and Methods: The extraction method used is maceration. One hundred grams of watermelon rind powder (112 g) added 700 ml of 96% ethanol. Then soak for 3 days. The extract is filtered using a filter to separate the filtrate and its residue. After that solvent evaporation was carried out until the dried extract was obtained, then tested the antioxidant activity of the extract using DPPH free radical catcher.
Results: Watermelon rind extract is classified as a powerful antioxidant because it has a ppm value ranging from 50-100 ppm.
Conclusion: It can be proven that the watermelon rind which is more often disposed of can also be used, contains vitamin C and lycopene which can connect freely to patients with leukoplakia and can be used as a support therapy for surgical therapy as a cause of leukoplakia disease.