jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Sobron Yamin Lubis | Rosehan | Ega Prasetya Hidayat | Silvi Ariyanti
Source: Jurnal Serina Sains Teknik dan Kedokteran (article, 2023-10-10)
Field: Materials Science — Materials Chemistry

ANALISA PERTUMBUHAN KEAUSAN MATA PAHAT KARBIDA PADA PROSES MILLING BAJA SKD 11 Proses pemesinan dapat dilakukan dengan menggunakan mesin milling. Dalam proses pemesinan, mata pahat merupakan hal yang penting untuk diperhatikan dalam penggunaanya untuk memotong logam yang keras. Pada proses pemesinan, parameter pemotongan merupakan faktor yang perlu dipertimbangkan sebelum melakukan proses milling. Penggunaan parameter pemotongan yang tidak tepat dapat berdampak pada keausan pada mata pahat pemotong. Penelitian ini dilakukan dengan tujuan untuk menganalisis pertumbuhan keausan yang terjadi pada mata pahat karbida end mill pada saat pemotongan baja SKD 11. Penelitian dilakukan dengan metode eksperimen dengan menggunakan mesin milling. Untuk mengamati pertumbuhan keausan yang terjadi pada mata pahat, maka kedalaman pemotongan divariasi antara lain 0,5, 1,0 dan 1,5 mm. Putaran spindle yang digunakan sebesar 1452 r/min. Proses pemesinan dilakukan dengan selang waktu 5 menit, setiap 5 menit pemesinan dihentikan untuk mengamati nilai keausan yang terjadi pada pahat potong. Nilai keausan cutting tool ditetapkan sebesar 0,3 mm. Apabila pada saat proses pemesinan nilai keausan yang ditentukan belum tercapai, maka proses pemesinan dilanjutkan. Dan bila nilai keausan sudah mencapai 0,3 mm maka pemesinan dihentikan dan diamati mata pahat tersebut. Proses milling selanjutnya dilakukan dengan meningkatkan kedalaman pemotongan , pada proses ini menggunakan cutting tool yang baru. Hasil yang diperoleh dari penelitian ini adalah bertambahnya kedalaman pemotongan memberi pengaruh terhadap cepatnya terjadi keausan pada mata pahat. Pada kedalaman pemotongan 1,5 mm, nilai keausan yang dicapai sebesar 0,31 dalam waktu 20 menit. Sedangkan pada depth of cut 0,5 dan 1,0 mm nilai keausan terjadi lebih lama yaitu 30 menit. Jenis keausan yang terjadi pada mata pahat karbida end mill adalah abrasive wear yang terjadi pada bagian tepi mata pahat. Keausan tepi terjadi karena adanya gesekan terus menerus antara mata pahat dengan benda kerja, sehingga bagian tepi mata pahat terkikis dan akhirnya terjadi keausan. Metallurgy ; Materials science Material Selection and Properties ; Management and Optimization Techniques ; Arduino and IoT Applications
Authors: Seitkerim Bimurzaev | N. U. Aldiyarov | Yerkin Yerzhigitov | Akmaral Tlenshiyeva | Ruslan Kassym
Source: The Scientific Issues of Ternopil Volodymyr Hnatiuk National Pedagogical University Series pedagogy (article, 2023-12-29)
Field: Chemistry — Spectroscopy

Покращення роздільної здатності та чутливості ортогонального часопролітного мас-спектрометра з ортогональною інжекцією іонів The theoretical possibilities of increasing the resolution and sensitivity of a time-of-flight mass spectrometer with orthogonal ion injection are considered. The effects are achieved by using inhomogeneous electrostatic fields of special configurations both in the accelerating and focusing parts of the device – a cylindrical immersion objective and a transaxial mirror, respectively. It is shown that the use of an inhomogeneous cylindrical field of a special configuration as an ion accelerator opens up the possibility of a multiple reduction in the energy spread of ions in injected ion packets, associated with the so-called "turnaround time" and, therefore, a significant (two or more times) increase in the limiting resolution of the mass spectrometer. The use of a transaxial electrostatic mirror as a time-of-flight mass analyzer makes it possible to significantly increase the sensitivity of the mass-spectrometer due to the implementation of triple space-time-of-flight focusing of ion packets. Key features include reduced ion energy spread, increased maximum resolution, and improved sensitivity due to triple focusing in space and time of flight. This research lays the foundation for expanding the capabilities of time-of-flight mass spectrometry, providing a more efficient and powerful tool for a wide range of scientific and industrial applications. The effects are achieved by using inhomogeneous electrostatic fields of a special configuration in both the accelerating and focusing parts of the device – a cylindrical immersion lens and a transaxial mirror, respectively. Numerical calculations of the system – a four-electrode cylindrical immersion lens in combination with a three-electrode transaxial mirror – are presented, which confirm the conclusions of the theory Electrostatic lens ; Ion ; Limiting ; Lens (geology) ; Sensitivity (control systems) ; Mass spectrometry ; Resolution (logic) ; Range (aeronautics) Mass Spectrometry Techniques and Applications ; Ion-surface interactions and analysis ; Analytical chemistry methods development
Authors: Shota Goto | Kang Kim | Nobuyuki Matubayasi
Source: arXiv (Cornell University) (preprint, 2023-05-25)
Field: Materials Science — Materials Chemistry

Unraveling the glass-like dynamic heterogeneity in ring polymer melts: From semi-flexible to stiff chain Ring polymers are an intriguing class of polymers with unique physical properties, and understanding their behavior is important for developing accurate theoretical models. In this study, we investigate the effect of chain stiffness and monomer density on static and dynamic behaviors of ring polymer melts using molecular dynamics simulations. Our first focus is on the non-Gaussian parameter of center of mass displacement as a measure of dynamic heterogeneity, which is commonly observed in glass-forming liquids. We find that the non-Gaussianity in the displacement distribution increases with the monomer density and stiffness of the polymer chains, suggesting that excluded volume interactions between centers of mass have a stronger effect on the dynamics of ring polymers. We then analyze the relationship between the radius of gyration and monomer density for semi-flexible and stiff ring polymers. Our results indicate that the relationship between the two varies with chain stiffness, which can be attributed to the competition between repulsive forces inside the ring and from adjacent rings. Finally, we study the dynamics of bond-breakage virtually connected between the centers of mass of rings to analyze the exchanges of inter-molecular networks of bonds. Our results demonstrate that the dynamic heterogeneity of bond-breakage is coupled with the non-Gaussianity in ring polymer melts, highlighting the importance of bond-breaking method in determining the inter-molecular dynamics of ring polymer melts. Overall, our study provides insights into the fundamental mechanism of ring polymers and sheds light on the factors that govern their dynamic behavior. Ring (chemistry) ; Polymer ; Molecular dynamics ; Materials science ; Chemical physics ; Radius of gyration ; Monomer ; Stiffness ; Breakage ; Mass distribution ; Computational chemistry ; Composite material ; Chemistry ; Physics Material Dynamics and Properties ; Rheology and Fluid Dynamics Studies ; Polysaccharides Composition and Applications
Authors: V.V. Gaivoronsky | N.А. Dmitrienko
Source: ТЕНДЕНЦИИ РАЗВИТИЯ НАУКИ И ОБРАЗОВАНИЯ (article, 2023-01-01)
Field: Materials Science — Polymers and Plastics

Improving the functionality of clothing by introducing computer technologies in IT The article presents information about the formation of clothing with computer technologies embedded in it, from the 19th century to the present day. The first samples were obtained by integrating lighting elements into clothing. Subsequent samples have become more advanced, and during the 21st century, such clothing is clothing with expanded functionality due to the fusion of the classic functionality of clothing with computer technology. Today, clothing developers, through such a merger, are trying to make it not only more functional and convenient in terms of use, but also focus on protecting the human body from external factors.The purpose of the article is to sum up well known clothing technologies.The purpose of this article is to conduct a detailed analysis of clothing developed using computer technology in order to see prospects for further work on designing work clothes. Clothing ; Computer science ; Work (physics) ; Engineering ; Architectural engineering ; Mechanical engineering ; Political science Textile materials and evaluations
Authors: Ilić, Jana | Trišić, Dijana | Čolović, Božana | Ilić, Bojana | Filipović Tričković, Jelena
Source: European Journal of Orthodontics (article, 2023-11-30)
Field: Materials Science — Materials Chemistry

EOS2023 Abstracts AIM:The aim of this study was to investigate the effect of Mastic mouthwash on halitosis (Volatile Sulfur Compounds' levels, VSCs) as well as plaque and gingival indexes in patients undergoing orthodontic treatment with fixed appliances.SUBJECTS AND METHOD: The study was a double-blinded, placebo-controlled, parallel group, randomized clinical trial.Thirty patients with fixed orthodontic appliances were randomly allocated at a 1:1 ratio, to either the mastic-mouthwash or the placebo-mouthwash group.Eligibility criteria included ages between 13 and 18, active orthodontic treatment with fixed appliances, good general health and total initial VSCs levels above the baseline level of 150ppb.The primary outcomes were: (a) their subjective perception of their own malodor via questionnaires, (b) their objective VSCs levels (hydrogen sulfide (HS), methylmercaptan (CHSH) and dimethyl sulfide ((CH)S) through the OralChroma device and (c) oral hygiene assessed with the use of the Modified Silness and Le Plaque Index (PI-M) and the Silness and Le Gingival Index (GI).Measurements were taken at baseline (T0) and after 2 weeks (T1).Stratified by gender randomization was implemented with two random sequences, one for each mouthwash, concealed in opaque numbered sealed envelopes.Blinding was applicable for outcome assessment.RESULTS: HS level dropped from 221.00ppb (T0) to 125.00ppb (T1) for the mastic group and the difference between treatments was statistically significant and in favor of the mastic group (coef : 72.34, 95% CI: 8.48, 136.27, p=0.03).The reduction in the levels of the other VSCs did not differ between treatment arms.The oral hygiene indexes showed only little differences after the intervention in both groups whereas the subjective measurements of oral malodor were similar in both groups and did not show any differences between T0 and T1.CONCLUSIONS: Mastic mouthwashes could be an alternative treatment for adolescent patient suffering from halitosis during the orthodontic treatment with fixed appliances.On the other hand, mastic mouthwashes did not seem to improve the oral hygiene of the patients. Medicine Shape Memory Alloy Transformations ; Orthodontics and Dentofacial Orthopedics ; Titanium Alloys Microstructure and Properties
Authors: EXTENDE | Bastien Clausse | Institut de soudure industrie | Nicolas Nourrit | Serge Demonte | BP Products North America | Mark Lozev | EKOSCAN | Hugo Cence | Patrice Houlle
Source: e-Journal of Nondestructive Testing (article, 2023-09-01)
Field: Materials Science — Metals and Alloys

Evaluation and Simulation of HTHA Damaged Specimen using UT Advanced Techniques High Temperature Hydrogen Attack (HTHA) is a wellknown phenomenon that impacts the design, operation, and maintenance for syngas production facilities (e.g., hydrogen and carbon monoxide plants). Recommendations regarding material selection and inspection are given by API 941 and API RP 586 [1], that is currently under revision after Tesoro accident. The new rules have highlighted the need to adapt inspection with more advanced NDT methodology, improving the detection of early stage HTHA damage, then supporting a Fitness for Service approach. This paper makes an overview of various projects funded by Materials Technology Institute (MTI) regarding the assessment and improvement of the performance of such UT advanced NDT for HTHA detection, by means of CIVA UT simulations after a detailed metallographic review and statistical modeling of material inclusions and HTHA damage distributions of field samples. HTHA damage inputs and comparisons between experimental and simulated UT images are consistent for different damaged samples (different levels and types of damage, especially for welded samples), different UT acquisition settings and different inspection frequencies. The unprecedented use of HTHA damage distribution laws and NDT simulations of nonmetallic defects and HTHA damage are promising tools which may then used to assess the limits of existing NDT and to define optimized probes and procedures relying on advanced ultrasonic examinations. Nondestructive testing ; Computer science ; Reliability engineering ; Forensic engineering ; Engineering Hydrogen embrittlement and corrosion behaviors in metals ; Non-Destructive Testing Techniques ; Welding Techniques and Residual Stresses
Authors: Feng Zhang | Jiajia Zhang | Weiyue Wang | Ruijie Du | Cheng Han | Zijie Qiao
Source: Advances in Mathematical Physics (article, 2023-12-02)
Field: Materials Science — Materials Chemistry

QMU Analysis of Flexoelectric Timoshenko Beam by Evidence Theory In recent years, with the rapid development of nanotechnology, a new type of electromechanical coupling effect similar to the piezoelectric effect, the flexoelectric effect, has gradually come into the public’s view. The flexoelectric beam that is the main structural unit of the flexoelectric signal output has broad application prospects in the next generation of micro- and nanoelectromechanical systems. Therefore, the investigation of flexoelectric materials and structures has important scientific and engineering application significances for the design of flexoelectric devices. In this paper, a model of flexoelectric Timoshenko beam is established, the deflection, rotation angle, and dynamic electrical signal output of the forced vibration are taken as the system response, and the density <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <mi>ρ</mi> </math> , shear correction factor <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2"> <mi>κ</mi> </math> , and frequency ratio <math xmlns="http://www.w3.org/1998/Math/MathML" id="M3"> <mi>λ</mi> </math> are selected as the key performance parameters of the system. The combination of available data and engineers’ experience suggests that there are random and cognitive uncertainties in the parameters. Therefore, the probability distribution of the system performance response is expressed by the likelihood function and belief function through the quantification of margins and uncertainties (QMUs) analysis methodology under the framework of evidence theory, and the system reliability or performance evaluation is measured by the calculated confidence factors. These results provide a theoretical basis for accurate analysis of flexoelectric components and provide guidance for the design of flexoelectric components with excellent performance. Timoshenko beam theory ; Beam (structure) ; Materials science ; Flexoelectricity ; Structural engineering ; Composite material ; Engineering Nonlocal and gradient elasticity in micro/nano structures ; Vibration and Dynamic Analysis ; Electromagnetic Effects on Materials
Authors: Mohana Vamsi Nuli
Source: International Journal of Current Innovations in Advanced Research (article, 2023-03-31)
Field: Chemistry — Analytical Chemistry

OVERALL REVIEW ON ANNALYTICAL METHOD DEVELOPMENT AND VALIDATION OF CABOZANTINIB In this review article determines the different analytical methods for the quantitative establishment of Cabozantinib by using HPLC, HPLCMS, HPLC-UV, LC-MS/MS. Pharmaceutical analytical method development of Cabozantinib requires valid analytical procedures for quantitative and qualitative analysis in Pharmaceuticals dosage formulations and human serum. This assessment explains that the superiority of the HPLC/LC-MS methods reviewed is based on the quantitative analysis of drugs in formulations, (API), biological fluids such as serum and plasma. Cabozantinib ; Quantitative analysis (chemistry) ; Chromatography ; Bioanalysis ; Biological fluids ; High-performance liquid chromatography ; Plasma concentration ; Chemistry ; Pharmacology ; Medicine ; VEGF receptors ; Internal medicine Analytical Methods in Pharmaceuticals ; Computational Drug Discovery Methods ; Synthesis of Tetrazole Derivatives
Authors: Zoran Šikić | Šime Marcelić | Karolina Brkić Bubola | Maja Jukić Špika | Ana Gašparović Pinto | Marko Zorica | Šimun Kolega | Igor Pasković | Anja Novoselić | Dora Klisović | Tomislav Kos
Source: Agriculture (article, 2023-09-21)
Field: Chemistry — Organic Chemistry

Modulation of the Irrigation Practices in Croatia for More Sustainable Olive Growing Olive groves in the Mediterranean may lose production sustainability because of their vulnerability to climatic change. Irrigation is an important measure that could significantly affect fruit yield, olive fruit fly infestation, and oil characteristics. The aim of paper was to compare the regulated deficit irrigation with different water management practices, in consecutive years, in two locations in Zadar County (Croatia), affecting fruit morphology, olive fruit fly infestation, and quantity and quality of the extracted Coratina cultivar oil. Treatments, namely C—rainfed, T1—deficit irrigation (produce’s practice), T2—regulated deficit irrigation, and T3—full irrigation (100% ECTO), were established. Irrigated treatments had a positive effect on all morphological characteristics of the fruit. The pulp mass, independently of the year, increased in irrigated treatment (ranging from 1.04 to 1.65 in C to 2.25 and 2.30 in the irrigated treatments) and resulted in a higher oil content on a fresh weight basis (ranging from 16.39% to 17.85% in C to 19.48% to 23.26% in the irrigated treatments). However, fruit yield per tree was only location-dependent. When olive fruit fly presence was high, fruit infestation was greatest in the irrigated compared to the rainfed treatment. According to quality parameters, all oils were classified as EVOO. Individual phenols were influenced by irrigation, while the composition of fatty acids was more influenced by location than treatment. The sensory characteristics of the resulting oil were slightly reduced compared to rainfed treatment. The results indicate that regulated deficit irrigation benefits water use sustainability without compromising the quality of the oil. Irrigation ; Deficit irrigation ; Olea ; Infestation ; Olive trees ; Cultivar ; Mediterranean Basin ; Mediterranean climate ; Horticulture ; Biology ; Agronomy ; Irrigation management Edible Oils Quality and Analysis ; Horticultural and Viticultural Research ; Essential Oils and Antimicrobial Activity
Authors: Ilona Müllerová | Ivo Konvalina | Martin Zouhar | Aleš Paták | Benjamin Daniel | Lukáš Pru ̊cha | Jakub Piňos | Eliška Mikmeková
Source: Microscopy and Microanalysis (article, 2023-07-22)
Field: Materials Science — Surfaces, Coatings and Films

Study of Graphene by Scanning Low Energy Electron Microscopy and Time-of-Flight Spectroscopy Journal Article Study of Graphene by Scanning Low Energy Electron Microscopy and Time-of-Flight Spectroscopy Get access Ilona Müllerová, Ilona Müllerová Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic Corresponding author: ilona.mullerova@isibrno.cz Search for other works by this author on: Oxford Academic Google Scholar Ivo Konvalina, Ivo Konvalina Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic Search for other works by this author on: Oxford Academic Google Scholar Martin Zouhar, Martin Zouhar Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic Search for other works by this author on: Oxford Academic Google Scholar Aleš Paták, Aleš Paták Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic Search for other works by this author on: Oxford Academic Google Scholar Benjamin Daniel, Benjamin Daniel Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic Search for other works by this author on: Oxford Academic Google Scholar Lukáš Pru˚cha, Lukáš Pru˚cha Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic Search for other works by this author on: Oxford Academic Google Scholar Jakub Piňos, Jakub Piňos Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic Search for other works by this author on: Oxford Academic Google Scholar Eliška Materna Mikmeková Eliška Materna Mikmeková Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic Search for other works by this author on: Oxford Academic Google Scholar Microscopy and Microanalysis, Volume 29, Issue Supplement_1, 1 August 2023, Pages 1861–1862, https://doi.org/10.1093/micmic/ozad067.960 Published: 22 July 2023 Czech ; Library science ; Political science ; Philosophy ; Computer science Electron and X-Ray Spectroscopy Techniques ; Advanced Electron Microscopy Techniques and Applications ; Force Microscopy Techniques and Applications
Authors: Zhiqiang Zhang | Guang Fu | D. Xu
Source: International Journal of Engineering (article, 2023-01-01)
Field: Materials Science — Materials Chemistry

A Dynamic Model for Laminated Piezoelectric Microbeam Piezoelectric beams are widely used in micro-electromechanical systems. At the microscale, the influence of the size effect on a piezoelectric beam cannot be ignored. In this paper, higher-order elasticity theories are considered to predict the behaviors of piezoelectric micro-structures and a size-dependent dynamic model of a laminated piezoelectric microbeam is established. The governing equations for the laminated piezoelectric microbeam are derived using the variational principle. The natural frequencies of piezoelectric microbeams are obtained by size-dependent dynamic models. The results reveal that the size effect can enhance the structural stiffness at the microscale. The natural frequency obtained by using the classical model is smaller than that obtained using the size-dependent model. Compared with the modified couple stress model, the modified couple stress model underestimates the size-dependent response. Thus, the modified couple stress model is a simplification of the modified strain gradient model. The influence of beam thickness on the natural frequency is also discussed. With increasing the thickness, the natural frequency of the size-dependent models gradually approaches the result of the classical model. If the value of h/l is greater than 15, the influence of the size effect can be neglected. Additionally, the relative thickness can influence the natural frequency, and if the relative thickness is greater than 5 or less than −5, the bilayer beam can be simplified to a single-layer beam. Microbeam ; Piezoelectricity ; Microscale chemistry ; Natural frequency ; Materials science ; Beam (structure) ; Mechanics ; Elasticity (physics) ; Stiffness ; Acoustics ; Composite material ; Optics ; Physics ; Mathematics ; Vibration Nonlocal and gradient elasticity in micro/nano structures ; Thermoelastic and Magnetoelastic Phenomena ; Advanced MEMS and NEMS Technologies