jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Hanrevo Fauzi Haris | Budiarto
Source: JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY (article, 2023-06-13)
Field: Materials Science — Materials Chemistry

Pengaruh Waktu Tempering Terhadap Struktur Kristal, Kekerasan, dan Kuat Tarik Pada Baja VCN 150 Baja VCN 150 termasuk dalam kategori baja ultra high-strength yang memiliki kekuatan sangat tinggi dan memadukan antara hardenability yang baik, keuletan, ketangguhan, dan ketahanan terhadap fatigue dan creep yang tinggi. Penulisan ini memaparkan pengaruh waktu tempering mengenai struktur kristal, kekerasan, serta kuat tarik pada baja vcn 150. Penelitian memakai metode penelitian kuantitatif yang menggunakan metode deskriptif dan studi eksperimental. Pengujian dilakukan melalui pengamatan struktur kristal memakai Difraktometer Sinar-X, uji kekerasan dan kuat tarik dengan Brinell. Hasil menunjukkan bahwa sifat mekanik dan fisik sangat dipengaruhi oleh proses quenching maupun tempering. Kekerasan material mengalami peningkatan setelah proses quenching dari 203 HB ke 393 HB menggunakan media quenching oli. Pada media pendingin air garam dapat meningkatkan kekerasan secara maksimal yaitu dari 203 HB ke 445,3 HB dan mengalami penurunan yang tidak signifikan kembali setelah melalui proses tempering. Penurunan kekerasan dari 445,3 HB ke 324 HB setelah 5 jam tempering. Penurunan ukuran kristal terjadi setelah proses tempering selama 5 jam yaitu dari 0,5766 (nm) ke 0,4725 (nm). Terjadi kenaikan nilai kerapatan diskolasi setelah proses tempering selama 5 jam yaitu 3,0679 (garis/mm²) ke 6,8527 (garis/mm²) begitu pula kenaikan regangan mikro setelah proses tempering selama 5 jam yaitu dari 0,1254 (ε) ke 0,2148 (ε). Nuclear chemistry ; Physics ; Tempering ; Chemistry ; Materials science ; Metallurgy Material Selection and Properties ; Aluminum Alloys Composites Properties ; Metal Forming Simulation Techniques
Authors: Dayang Liu | Huiting Zhang | Congcong Wang | Feng Lv | Tao Yanrong | Liangkuan Zhu
Source: Research Square (preprint, 2023-09-11)
Field: Chemistry — Analytical Chemistry

Combining transfer learning and hyperspectral imaging to identify bruises of pears across different bruise types <title>Abstract</title> Background Mechanical bruise is one of the most crucial factors affecting the quality of pears, which has a huge influence on postharvest transportation, storage, and sale of pears. To rapidly detect early bruises of pears across different bruise types, hyperspectral imaging technology coupled with transfer learning methods was performed in this study. Results Two transfer learning methods, i.e., transfer component analysis (TCA) and manifold embedded distribution alignment (MEDA), were applied for two tasks (impact bruise → crush bruise, crush bruise → impact bruise). Supporting vector machine (SVM) was set as a baseline to conduct analysis and comparison of the transferability of the models. The result showed that, for task 1 (impact bruise → crush bruise), MEDA and TCA-SVM model achieved a classification accuracy of 93.33% and 91.11% in target domain, individually. For task 2 (crush bruise → impact bruise), MEDA and TCA-SVM model achieved an accuracy of 88.89% and 85.19% in target domain, respectively. Both of the two models improved the accuracy compared with SVM models (84.44% for task 1; 77.04% for task 2). Conclusion Overall, the results indicated that transfer learning approaches could perform pear bruise detection across different bruise types. Hyperspectral imaging in combination with transfer learning methods is a promising possibility for the efficient and cost-saving field detection of fruit bruises among different bruise types. Bruise ; Artificial intelligence ; Hyperspectral imaging ; Transfer of learning ; Computer science ; Pattern recognition (psychology) ; Support vector machine ; Computer vision ; Machine learning ; Medicine ; Surgery Spectroscopy and Chemometric Analyses
Authors: Gonca ŞİMŞEK GÜNDÜZ
Source: Çukurova Üniversitesi Mühendislik Fakültesi Dergisi (article, 2023-07-27)
Field: Materials Science — Biomaterials

Elektrolif Çekim Yönteminde Gerilim Miktarının Poliakrilonitril Nanoliflerinin Morfolojisine Etkisi Çalışmada elektro lif çekim yönteminde farklı gerilim miktarlarında üretilen poliakrilonitril (PAN) nanoliflerinin morfolojik özelikleri incelenmiştir. Bu amaçla 14 kV, 20 kV ve 26 kV değerlerinde gerilim uygulanarak üretim yapılmıştır. Nanoliflerin çapları taramalı elektron mikroskobu (SEM) ile ölçülmüş, elde edilen çap değerlerinin istatistiki olarak karşılaştırılmasında SPSS programından yararlanılmıştır. 14 kV’ta üretilen nanoliflerin ortalama çapları 519-582 nm arasında değişirken bu değer 20kV’ta 511-566 nm ve 26 kV’ta 506-569 nm aralığında değişmiştir. Gerilim miktarı belli bir değere kadar arttırıldığında hem daha ince lifler elde edilmiş hem daha kolay çap kontrolü sağlanabilmiştir. Gerilim miktarının daha da artırılması ile boncuk oluşumunun ve boncuk büyüklüğünün arttığı görülmüştür. Ayrıca uygulanan gerilimin lif dizilimi ve lifler arası boşluğu etkilediği gözlenmiştir. Polyacrylonitrile ; Nanofiber ; Electrospinning ; Morphology (biology) ; Materials science ; Chemistry ; Nuclear chemistry ; Composite material ; Biology ; Polymer Electrospun Nanofibers in Biomedical Applications ; Advanced Sensor and Energy Harvesting Materials ; Silk-based biomaterials and applications
Authors: Mehdi Monemi | Mohammad Amir Fallah | Mehdi Rasti | Matti Latva‐aho | Mérouane Debbah
Source: arXiv (Cornell University) (preprint, 2023-12-24)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Towards Near-Field 3D Spot Beamfocusing: Possibilities, Challenges, and Use-cases Spot beamfocusing (SBF) is the process of focusing the signal power in a small spot-like region in the 3D space, which can be either hard-tuned (HT) using traditional tools like lenses and mirrors or electronically reconfigured (ER) using modern large-scale intelligent surface phased arrays. ER-SBF can be a key enabling technology (KET) for the next-generation 6G wireless networks offering benefits to many future wireless application areas such as wireless communication and security, mid-range high-power and safe wireless chargers, medical and health, physics, etc. Although near-field HT-SBF and ER-beamfocusing have been studied in the literature and applied in the industry, there is no comprehensive study of different aspects of ER-SBF and its future applications, especially for nonoptical (mmWave, sub-THz, and THz) electromagnetic waves in the next generation wireless technology, which is the aim of this paper. The theoretical concepts behind ER-SBF, different antenna technologies for implementing ER-SBF, employing machine learning (ML)-based schemes for enabling channel-state-information (CSI)-independent ER-SBF, and different practical application areas that can benefit from ER-SBF will be explored. Wireless ; Computer science ; Antenna (radio) ; Field (mathematics) ; Channel (broadcasting) ; Telecommunications Metamaterials and Metasurfaces Applications ; Microwave Engineering and Waveguides ; Advanced Antenna and Metasurface Technologies
Authors: Yizhong Hu | Yaowu Hu
Source: Preprints.org (preprint, 2023-12-12)
Field: Chemistry — Organic Chemistry

Precise Microwave Welding Induced by Localized Surface Plasmon: A Novel Way for Large-Scale Non-Metallic Material Joining with High Quality and Low Consumption Traditional methods of non-metallic materials joining for industrial uses are limited to lasers, or induction or conduction heating. The precision and efficiency for large-scale applications are difficult to be achieved at the same time. Here in this paper, we report a precise microwave welding method induced by localized surface plasmon of metallic macro-gaps under microwave excitation. The proposed method utilizes energy from well-developed commercial microwaver, and benefits from the precision of localized surface plasmon, an oscillating electron cloud excited by electromagnetic waves, which is currently under hot investigation only at micro- or nano-scales. The method is applied to the welding of polymers to solve the problems of complex processing equipment and high processing energy consumption in the traditional welding process, so as to cope with the growing energy and environmental crisis. Finite element numerical simulations are used to study the distribution characteristics of electric fields and temperature fields. The results show that the process is a high quality, efficient, low consumption and environmentally friendly green process compared to traditional polymer welding methods. Welding ; Materials science ; Surface plasmon ; Microwave ; Energy consumption ; Mechanical engineering ; Plasmon ; Finite element method ; Optoelectronics ; Electronic engineering ; Computer science ; Composite material ; Electrical engineering ; Engineering ; Structural engineering ; Telecommunications Microwave-Assisted Synthesis and Applications ; Electromagnetic wave absorption materials
Authors: Nwambu Chidume | Chibueze Ikechukwu | Iyebeye Kelvin | Ekwedigwe Chilee
Source: Archive of Biomedical Science and Engineering (article, 2023-10-17)
Field: Materials Science — Materials Chemistry

Optimization of viscoelastic behaviors of bioinspired asymmetric helicoidal CFRP composites using Taguchi Method The dynamic mechanical properties play an important role in the selection of suitable materials in the manufacturing wing of aircraft and wind turbine blades. In this paper, the standard Taguchi method was used to examine the effect of inter-ply stacking angles of 0° (UD), 0/90° (cross-ply), 5°, 15°, 10°, 20°, 25° 30° and aging temperature (ambient temperature, 40o, 60o) on the dynamic mechanical properties of bioinspired asymmetric helicoidal Carbon Fiber Reinforced Plastic (CFRP) composites. The standard Taguchi’s L18 was used. The signal-to-noise ratio and analysis of variance were introduced to analyze and estimate the optimal combination parameters. The results show the dynamic mechanical properties are linearly correlated to the fiber architecture and aging temperature. Analysis of variance (ANOVA) indicates that inter-ply stacking angles (15°, and 20°) and aging temperature (40o, 60o) are the main significant factors affecting the dynamic mechanical values at a 95% confidence level. Inter-ply stacking angles are finally noted as critical factors affecting the extent of macromolecular mobility within helicoidally stacked continuous fiber CFRP composites. A confirmation test validated the optimized results and it was found that there were improvements in S/N ratios from initial to optimal setting. The experimental and expected results are very close, with an error ratio not exceeding 5%. Taguchi methods ; Materials science ; Composite material ; Stacking ; Orthogonal array ; Viscoelasticity ; Structural engineering Material Selection and Properties ; Mechanical Behavior of Composites ; Mechanical Engineering and Vibrations Research
Authors: Anitha Nilavan | S. Vadivelan | Anu Ratthika | R. Srinivasan | S. Rajendran | Thiruvenkadam Gowrani
Source: Zastita materijala (article, 2023-06-10)
Field: Materials Science — Materials Chemistry

Influence of dilution and addition of soda water on the corrosion resistance of orthodontic wires immersed in artificial saliva in presence of Copper Barrel, a hard drink Copper barrel brandy can be taken orally with dilution of bisleri water or soda water and without dilution. People clipped with orthodontic wires may take copper barrel brandy orally, with dilution of without dilution. How far the orthodontic wires will be affected by these items? To find an answer the present research work is undertaken. Corrosion resistance of orthodontic wires made of Ni-Ti alloy and Ni-Cr alloy in artificial saliva in the absence and presence of copper barrel, water and soda water has been evaluated by AC impedance spectra. It is generally observed that Ni-Ti alloy is more corrosion resistant than Ni-Cr alloy in artificial saliva in the presence of copper barrel, water and soda water. When orthodontic wire made of Ni-Ti is immersed in artificial saliva, the charge transfer resistance (Rt) value is 31945Ohmcm2 . When it is immersed in copper barrel + artificial saliva (AS) system, Rtvalue increase to 80000Ohmcm2 . When it is immersed in soda water + artificial saliva (AS) system, Rtvalue increase to 76450Ohmcm2 . When it is immersed in water + artificial saliva (AS) system, Rtvalue increase to 82620Ohmcm2 . On the other hand, when orthodontic wire made of Ni-Cr is immersed in artificial saliva, the charge transfer resistance (Rt) value is 80930Ohmcm2 . When it is immersed in copper barrel + artificial saliva (AS) system, Rtvalue decrease to 11104Ohmcm2 . When it is immersed in soda water + artificial saliva (AS) system, Rtvalue decrease to 10437Ohmcm2 . It implies that the people who have been clipped with orthodontic wire made of Ni-Ti alloy can take copper barrel in any form, namely, with dilution or without dilution. The people who have been clipped with orthodontic wire made of Ni-Cr alloy should avoid taking copper barrel in any form, namely, with dilution or without dilution. Saliva ; Dilution ; Copper ; Barrel (horology) ; Alloy ; Corrosion ; Materials science ; Copper wire ; Metallurgy ; Composite material ; Chemistry ; Biochemistry Corrosion Behavior and Inhibition ; Hydrogen embrittlement and corrosion behaviors in metals ; Electrodeposition and Electroless Coatings
Authors: Qian Lu | Jingjing Li | ZISENG LIN | Jin Zhou
Source: Industria Textila (article, 2023-10-31)
Field: Materials Science — Polymers and Plastics

Decoding the fashion trend of sports shoes with empowered computer vision To adapt to the rapidly changing market and capricious trends, fashion brands need to understand trends and market conditions precisely and fast to produce marketable products. The traditional fashion trend analysis has relied heavily on the subjective judgement of experts, inevitably leading to biased decisions and is time-consuming. The development of computer vision and machine learning provides an objective and systematic approach to processing images and analysis of fashion products. However, most studies focus on clothing trends analysis, few are on shoe trends analysis. Hence, this study aimed to decode and analyse the fashion trend of sports shoes with empowered computer vision technology. In this paper, a dataset containing e-commerce images of sports shoes with precise annotations was established; then Mask-RCNN was utilized to classify and extract the shoe from the background image; a modified version of the K-means clustering algorithm was employed to detect the shoe colour. The results indicated that fashionable sports shoes and casual sports shoes were the most prevalent two styles. Besides neutral tones, yellow, red ochre and reddish orange were popular in casual sports shoes, fashion sports shoes and basketball shoes respectively and Atlantic Blue in board shoes and trainers. This study demonstrated the promising potential of computer vision and machine learning as a new method to analyse footwear fashion trends efficiently and economically. Casual ; Clothing ; Computer science ; Advertising ; Artificial intelligence ; Business ; Political science Textile materials and evaluations ; Industrial Vision Systems and Defect Detection
Authors: М. Г. Токмачев
Source: Computer Optics (article, 2023-12-01)
Field: Chemistry — Spectroscopy

A method for estimating the polymer gel granule volume by an optical technique The paper proposes an algorithm for processing a photo of a granule in order to determine its volume. Factors that influence the result of automatic data processing in the optical micrometry method are investigated. It is shown that by estimating the outline of an ellipse-shaped granule, the algorithm determines its volume with a relative error of 0.4 %, which corresponds to an error in determining the granule diameter of 1 pixel. Granule (geology) ; Polymer ; Materials science ; Volume (thermodynamics) ; Biological system ; Composite material ; Physics ; Thermodynamics Adsorption, diffusion, and thermodynamic properties of materials ; Computer Graphics and Visualization Techniques ; Advanced Measurement and Metrology Techniques
Authors: Magnus Gustafsson
Source: Journal of Physics Conference Series (article, 2023-01-01)
Field: Chemistry — Spectroscopy

Accurately computed H<sub>2</sub>–He collision-induced absorption coefficients for modeling of planetary atmospheres Abstract Accurate collision-induced absorption profiles for H 2 –He pairs, in the rototranslational band of H 2 , are computed accounting for the full anisotropic interaction potential. The calculations are time consuming and complicated compared to those pursued in the isotropic potential approximation. A machine learning approach is implemented in order to produce highly accurate data on a dense frequency grid, by combining data computed in the full calculation with those from the isotropic approximation. Thus an extensive, highly accurate, data base can be obtained for a set of frequencies, temperatures, and ortho-H 2 /para-H 2 fractions, appropriate for use in modeling of planetary atmospheres, in particular of the gas giants. Isotropy ; Collision ; Anisotropy ; Computational physics ; Absorption (acoustics) ; Collision frequency ; Data set ; Grid ; Physics ; Set (abstract data type) ; Atomic physics ; Optics ; Mathematics ; Computer science ; Geometry ; Nuclear physics ; Statistics ; Plasma Spectroscopy and Laser Applications ; Atmospheric Ozone and Climate ; Atmospheric and Environmental Gas Dynamics
Authors: M. M. Alam | Md. Rafiquzzaman
Source:  (article, 2023-05-16)
Field: Materials Science — Polymers and Plastics

Impact of Fiber Orientation on the Mechanical Properties of Rice Straw-Glass Fiber Reinforced Polymer Composites Polymer composite, presently one of the most promising and innovative fields of research, and the importance of using biodegradable fibers as reinforcement in polymer composite material is growing rapidly.In this era of excessive depletion of petroleum resources and for new green environmental regulations, natural fiber-based composites can be crucial for the environment.In this study, a composite has been produced using reinforcement of glass fiber and rice straw and a matrix of epoxy resin.Mechanical properties of the composite such as impact and flexural properties have been investigated.The fiber orientation has a great impact on the mechanical properties of these composites.Impact and flexural strength both were found to be higher at 0° fiber orientation.Flexural strength rapidly decreased as the orientation angle of fiber increased from 0° to 90°.On the other hand, impact strength decreased up to 45° and then it again increased until the orientation angle reaches 90°. Composite material ; Materials science ; Glass fiber ; Fiber ; Straw ; Orientation (vector space) ; Polymer ; Mathematics ; Geometry Natural Fiber Reinforced Composites
Authors: R. Hisam
Source: Scientific Research Journal (article, 2023-09-21)
Field: Materials Science — Ceramics and Composites

Investigation on The Effect of Bismuth Concentration Towards Radiation Shielding Properties in Ag-embedded Borobismuthate Mixed Ionic Electronic Glass System In this study, 20Li2O–xBi2O3–(79-x)B2O3–1Ag glasses for x=3,5,7,9, and 11 mol % glasses were prepared by using the melt quenching technique to investigate radiation shielding properties of the glasses using Phy-X/PSD simulation program at 15 keV to 15 MeV photon energy range. The radiation shielding parameters were carried out to determine the mass attenuation coefficient (MAC), linear attenuation coefficient (LAC), half value layer (HVL), mean free path (MFP) and effective atomic number (Zeff). The results showed that the Bi2O3 addition has improved overall radiation shielding properties. The MAC of the glass system was increased as Bi2O3 concentration increased. The HVL showed that present glass better than standard commercial concretes as lower HVL value indicates better shielding where 11 mol % required a much smaller thickness than 3 mol %. Therefore, sample with highest bismuth content has the most effective radiation protective property. Smaller MFP is most preferable as it suitable for protection materials; indicated the 11 mol % is best candidate for radiation shielding. Lastly, the higher value in Zeff was contributed by higher atomic number of Bi over B; thus, enhanced protection performance. Effective atomic number ; Half-value layer ; Electromagnetic shielding ; Materials science ; Mean free path ; Mass attenuation coefficient ; Bismuth ; Attenuation ; Radiation ; Analytical Chemistry (journal) ; Atomic number ; Attenuation coefficient ; Radiation shielding ; Composite material ; Atomic physics ; Optics ; Chemistry ; Scattering ; Physics ; Metallurgy Glass properties and applications ; Nuclear materials and radiation effects ; Luminescence Properties of Advanced Materials
Authors: Mustafa Can TOPBAŞOĞLU | Cihan Kaboğlu | Mustafa KELEŞ
Source: Afyon Kocatepe University Journal of Sciences and Engineering (article, 2023-06-22)
Field: Materials Science — Polymers and Plastics

RTM Yönteminde Jelkot ve Laminasyon Planının Nihai Ürünün Mekanik Özelliklerine Etkisi Bu çalışmada, Reçine Transfer Kalıplama (RTM) yöntemiyle üretilmiş cam fiber takviyeli kompozit plakalarda elyaf ağırlığının ve jelkotun mekanik özelliklere etkisi incelenmiştir. Üç farklı laminasyon planı ve bu planların jelkotlu halleri kullanılmıştır. Numunelerin incelenmesi için çekme testi, üç nokta eğme testi ve Barcol sertlik testleri yapılmıştır. Laminasyon planlarında 300 g/m2, 450 g/m2, 600 g/m2 olmak üzere 3 farklı ağırlıkta elyaf kullanılmıştır. Ayrıca laminasyon arasında 180 g/m2 ve 250 g/m2 polipropilen köpük malzeme kullanılmıştır. Her laminasyon için bir jelkotlu, bir jelkotsuz plaka üretilmiştir. Üretim sonunda kalınlıkları 2.5 – 3.2 mm arasında değişen 6 plaka üretilmiştir. Üç nokta eğme ve çekme testi için 10’ar numune kesilmiştir, Barcol sertlik testi plaka üzerinde 5 noktadan alınmıştır. Testler sonucunda elyaf ağırlığının artmasıyla mukavemet değerlerinin arttığı, uzama değerlerinin azaldığı gözlemlenmiştir. Her laminasyonun jelkotlu hallerinde %5 - 15 aralığında mekanik özellik düşüşü gözlemlenmiştir. Physics ; Composite material ; Chemistry ; Materials science Natural Fiber Reinforced Composites ; Textile materials and evaluations ; Mechanical Behavior of Composites