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Role of compact and elongated configurations in the spontaneous fission of heavy and superheavy nuclei

Physical Review C 2024年第6期110卷 064614-064614页

作者： Ashutosh Kaushik Kanishka Sharma Manoj K. Sharma Department of Physics and Materials Science Thapar Institute of Engineering & Technology Patiala - 147004 Punjab India School of Vocational Studies and Applied Sciences (USOVSAS) Gautam Buddha University Greater Noida-201312 India

The spontaneous fission analysis of even mass (U230 to Hs264) nuclei is carried out using the quantum mechanical fragmentation theory (QMFT) based preformed cluster model (PCM). The effect of deformations and orientations is investigated in view of the spontaneous fission of the considered nuclei. The PCM treats the spontaneous emission in terms of the barrier tunneling process where the fragments are preformed with a relative probability within the QMFT framework. The addition of deformation effects, i.e., β2 (elongated)-deformed and β2 (compact)-deformed, considerably modify the fragmentation potential, penetration path, and related barrier characteristics, resulting in significant change in the mass and charge of emitting fragments. The half-life time calculated using compact β2 deformed fragments find better comparison with experimental data. For this configuration, the transition from asymmetric fission to nearly symmetric fission takes place with an increase in the mass/charge number of the considered nuclei. The effect of deformations on the decay of A=230–264 parent nuclei is also analyzed in terms of barrier characteristics such as barrier height, barrier position, and fissility parameter, and the most probable fragments operating in spontaneous fission process are identified. In addition to this, the substructure of fission fragments and the isobaric behavior is analyzed within the collective clusterization approach.

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Enhancing PV solar panel efficiency through integration with a passive Multi-layered PCMs cooling system: A numerical study

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International Journal of Thermofluids 2024年 23卷

作者： Sheikh, Yahya Jasim, Muhammad Qasim, Muhammad Qaisieh, Alaa Hamdan, Mohammad O. Abed, Farid Materials Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Department of Mechanical Engineering American University of Sharjah Sharjah United Arab Emirates Department of Chemical and Biological Engineering American University of Sharjah Sharjah United Arab Emirates Civil Engineering Department American University of Sharjah Sharjah United Arab Emirates

Photovoltaic (PV) solar cells are at the forefront of sustainable electricity generation technologies, yet they exhibit relatively low efficiency. Typically, less than 20 % of the solar energy absorbed is converted into electrical energy, with the remainder converts into heat. This heat increases the PV panel's operating temperature, negatively impacting its efficiency and life expectancy. To mitigate this, a novel approach using multi-layered phase change materials (PCMs) has been examined in this study. The approach involves integrating organic PCMs (OPCMs) with metallic PCMs (MPCMs), enhancing PV panel cooling efficiency by attaching the multi-layer PCM to the panel's rear. This study, employing ANSYS FLUENT software's solidification and melting model, explores the impact of multi PCM layers thickness and total multi layers thickness on PV cell temperature and electrical efficiency. The analysis reveals that a multi-layered PCMs configuration with a thickness ratio of 15:85 between MPCM (CERROLOW-117® alloy) and OPCM (RT44) significantly decreases temperature rise in PV cells, resulting in a temperature drop of 59.6 °C. This improvement boosts PV panel performance by an average of 35.8 % compared to panels lacking cooling systems during peak sun hours under hot climate conditions characterized by ambient temperatures of 40 °C and high solar radiation exceeding 1000 W/m². This suggests that a carefully optimized PCM layering approach could markedly improve PV system efficiency, offering a practical solution to the overheating problem and extending the operational life of PV installations. © 2024 The Author(s)

关键词： Phase change materials

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Material-to-system tailored multilayer-cyclic strategy toward practical atmospheric water harvesting

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Proceedings of the National Academy of sciences of the United States of America 2025年第20期122卷 e2500928122页

作者： Zhao, Yaxuan Guan, Weixin Wong, Yan Zhe Lei, Chuxin Wang, Yuyang Liu, Xiaomeng Yu, Guihua Materials Science and Engineering Program The University of Texas at Austin Austin 78712 TX United States Walker Department of Mechanical Engineering The University of Texas at Austin Austin 78712 TX United States

Solar-driven atmospheric water harvesting (AWH) presents a sustainable approach for freshwater production with sunlight as the sole energy input. To address challenges posed by diurnal moisture variations and diffusive sunlight, we present a system-wide approach that synergistically enhances moisture capture and solar energy utilization in an integrated water harvester. Moisture utilization at the bulk sorbent scale is improved through the hierarchical pore structure of scalable biomass gel sheets enabling rapid regeneration and is further upscaled to system-level performance through a kinetics-matched, continuously multicyclic operation protocol in a multilayered device. Solar energy utilization is enhanced by thermoresponsive hydrogels that lower the energy threshold for water desorption and by efficient thermal and mass flow management that increases energy efficiency. Our system delivers up to 235.09 mL d⁻¹ of water with an energy efficiency as high as 26.4%, excluding solar panel power. This work offers an insight into developing energy-, material-, and space-efficient AWH systems from a cross-scale understanding of sorbent properties, device engineering, and operation protocol tailoring. Copyright © 2025 the Author(s).

关键词： device hydrogel sorption water harvesting

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Subtractive processing of thick silicon nitride waveguide resonators: a comparison of soft and hard etch templates 25

Subtractive processing of thick silicon nitride waveguide re...

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Laser Resonators, Microresonators, and Beam Control XXV 2023

作者： Colacion, Gabriel M. Rukh, Lala Stone, Brandon Drake, Tara E. Optical Science & Engineering Program Center for High Technology Materials University of New Mexico 1313 Goddard SE AlbuquerqueNM87106 United States Dept. of Physics & Astronomy University of New Mexico 210 Yale Blvd NE AlbuquerqueNM87106 United States

ISBN: (纸本)9781510659193

Chip-based photonic microresonators are attractive for a multitude of applications owing to their small form factors and compatibility with photonic integration and standard CMOS fabrication. Within the last decade, the ring resonator geometry has gained widespread adoption in the application of optical frequency comb generation. However, these devices often require waveguides several hundreds of nanometers thick, posing a challenge for subtractive fabrication processes where the desired pattern must be chemically etched with the use of a protective "mask" pattern. Here, we demonstrate two procedures for subtractive processing of thick SiN waveguides based on both a polymer-based "soft" photoresist mask and a chromium metallic "hard" mask as etch templates. Optical characterization of our devices fabricated with both soft mask and hard mask techniques demonstrate quality factors of 320k ± 100k and 500k ± 180k., respectively. Furthermore, this work details two reliable pathways for achieving high quality optical microring resonators and illustrates the benefits and drawbacks of these two techniques. © 2023 SPIE.

关键词： Silicon nitride

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p-Norm Broad Learning for Negative Emotion Classification in Social Networks

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Big Data Mining and Analytics 2022年第3期5卷 245-256页

作者： Guanghao Chen Sancheng Peng Rong Zeng Zhongwang Hu Lihong Cao Yongmei Zhou Zhouhao Ouyang Xiangyu Nie Laboratory of Language Engineering and Computing Guangdong University of Foreign StudiesGuangzhou 510006China Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South China Normal UniversityGuangzhou 511400China School of Computer Science and Software Zhaoqing UniversityZhaoqing 526000China School of Information Science and Technology Guangdong University of Foreign StudiesGuangzhou 510006China School of Computing University of LeedsLeeds LS29JTUnited Kingdom

Negative emotion classification refers to the automatic classification of negative emotion of texts in social *** existing methods are based on deep learning models,facing challenges such as complex structures and too many *** meet these challenges,in this paper,we propose a method for negative emotion classification utilizing a Robustly Optimized BERT Pretraining Approach(RoBERTa)and p-norm Broad Learning(p-BL).Specifically,there are mainly three contributions in this ***,we fine-tune the RoBERTa to adapt it to the task of negative emotion ***,we employ the fine-tuned RoBERTa to extract features of original texts and generate sentence ***,we adopt p-BL to construct a classifier and then predict negative emotions of texts using the *** with deep learning models,p-BL has advantages such as a simple structure that is only 3-layer and fewer parameters to be ***,it can suppress the adverse effects of more outliers and noise in data by flexibly changing the value of ***,we conduct extensive experiments on the public datasets,and the experimental results show that our proposed method outperforms the baseline methods on the tested datasets.

关键词： social networks negative emotion RoBERTa broad learning p-norm

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Investigation of manufacturing conditions of single roll rapidly solidified ribbon for anode materials of magnesium rechargeable batteries

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Keikinzoku/Journal of Japan Institute of Light Metals 2023年第11期73卷 537-544页

作者： Kirimoto, Yuichi Fuke, Kousuke Tsukeda, Tadayoshi Aida, Tetsuo Nemoto, Yasunori Ikeda, Minoru Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama 3190 Gofuku Toyama-shi-shiToyama Toyama930-8555 Japan Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama Toyama-shi-shiToyama Toyama Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama-shi-shiToyama Toyama Japan FLOW Science JAPAN Shizuoka Hamamatsu-shi Japan CHUETSU METAL WORKS CO. LTD Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Saitama Kawaguchi-shi Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

Magnesium rechargeable batteries are attracting attention as next-generation rechargeable batteries because of their resource abundance, cost, safety, and high electrical capacity per volume compared to conventional lithium-ion rechargeable batteries. Our joint research team focused not only on the electrochemically active magnesium composition of ribbon for the negative electrode materials of magnesium rechargeable batteries but also on the production process, focused on the single roll type liquid quenching and rapid solidification method, which can be produced at a lower cost. In this study, the optimal processing conditions were examined by comparing CAE analysis with ribbon actually manufactured, with the aim of further improving manufacturing conditions using the same method, such as length discontinuities, thickness, and surface properties of ribbon. We specifically various process parameters such as injection pressure and roll peripheral speed for evaluation. As a result, several linear cracks were observed on the surface of the ribbon as the peripheral speed increased and as the Gap became wider, and the surface properties tended to deteriorate. Also, It was found that the dominant factor in the length of the ribbon was the peripheral speed. As the peripheral speed increased, the length of the ribbon tended to increase. © 2023 Japan Institute of Light Metals. All rights reserved.

关键词： Surface properties

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The Electronic Transport Channel Protection and Tuning in Real Space to Boost the Thermoelectric Performance of Mg_(3+δ)Sb_(2-y)Bi_(y) near Room Temperature

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Research 2020年第1期2020卷 146-157页

作者： Zhijia Han Zhigang Gui Y.BZhu Peng Qin Bo-Ping Zhang Wenqing Zhang Li Huang Weishu Liu Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 10083China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

The optimization of thermoelectric materials involves the decoupling of the transport of electrons and *** this work,an increased Mg_(1)-Mg_(2) distance,together with the carrier conduction network protection,has been shown as an effective strategy to increase the weighted mobility(U=μm∗3/2)and hence thermoelectric power factor of Mg_(3+δ)Sb_(2-y)Bi_(y) family near room ***_(3+δ)Sb_(0.5)Bi_(1.5) has a high carrier mobility of 247 cm^(2)V^(-1) s^(-1) and a record power factor of 3470μWm^(-1) K^(-2) at room *** both efficiency and power density,Mg_(3+δ)Sb_(1.0)Bi_(1.0) with a high average ZT of 1.13 and an average power factor of 3184μWm^(-1) K^(-2) in the temperature range of 50-250℃ would be a strong candidate to replace the conventional n-type thermoelectric material Bi_(2)Te_(2.7)Se_(0.3).The protection of the transport channel through Mg sublattice means alloying on Sb sublattice has little effect on electron while it significantly reduces phonon thermal conductivity,providing us an approach to decouple electron and phonon transport for better thermoelectric materials.

关键词： temperature alloying transport

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Discovery of Ni Activated Sintering of MoNbTaW Predicted by a Computed Grain Boundary Diagram

SSRN

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SSRN 2023年

作者： Shivakumar, Sashank Song, Keqi Wang, Chunyang Lei, Tianjiao Xin, Huolin L. Rupert, Timothy J. Luo, Jian Department of Nano and Chemical Engineering Program of Materials Science and Engineering University of California San Diego La Jolla CA92093 United States Department of Physics and Astronomy University of California IrvineCA92697 United States Department of Materials Science and Engineering Department of Mechanical and Aerospace Engineering University of California IrvineCA92697 United States

Activated sintering of refractory metals represents a classical phenomenon in powder metallurgy. This study discovers that Ni addition can enhance sintering of MoNbTaW both above and below the bulk solidus composition at 1800 °C, thereby demonstrating the first example of activated sintering of a high-entropy alloy. To probe the underlying mechanism, experiments reveal complete grain boundary (GB) wetting above the bulk solidus composition, which logically infers the stabilization of a liquid-like interfacial phase (GB complexion) in a prewetting region below the bulk solidus composition. Furthermore, bulk CALPHAD (calculation of phase diagram) methods have been extended to model GBs in Ni-doped MoNbTaW to compute a GB "phase" diagram to forecast high-temperature GB disordering in the prewetting region and rationalize the observed Ni activated sintering of MoNbTaW. Only weak GB segregation of Ni is found in furnace-cooled specimens, which suggests GB "drying" during cooling, consistent with the observed nanoscale precipitates along GBs. © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

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Fabrication, Characterization, and Electromechanical Reliability of Stretchable Circuitry for Health Monitoring Systems

Fabrication, Characterization, and Electromechanical Reliabi...

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Electronic Components and Technology Conference (ECTC)

作者： Behnam Garakani K. Udara S. Somarathna Riadh Al-Haidari Firas W Alshatnavi Detlef-Matthias Smilgies Mark D Poliks Materials Science and Engineering Program Binghamton University Binghamton USA Department of System Science and Industrial Engineering Binghamton University Binghamton USA Department of System Science and Engineering Binghamton University Binghamton USA

In this study, commercially available stretchable hybrid conductors including silver flakes in an elastomeric matrix were screen printed on thermoplastic polyurethane (TPU) followed by encapsulation via the stretchable dielectric. Test vehicles include straight and serpentine lines with various thicknesses and wavelengths, respectively. Metrology was also performed to assess line thickness, width, and variability. The modular force stage (MFS) was used to characterize the initiation and propagation of microcracks. The results of the uniaxial tensile test showed that increasing the strain amplitude resulted in an increase in the electrical resistance and the rate of damage accumulation in the serpentine traces was lower than that of the straight traces. Additionally, the serpentine trace with the highest ratio of meander arm length to curvature remained conductive up to a strain amplitude of 150%. A systematic increase in electrical resistance from cycle to cycle was observed when the conductor was subjected to a strain amplitude of 10% for 1000 stretching cycles. The effect of processing conditions as well as test conditions will be discussed in detail.

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Development of Low-cost and Robust IoT Field Station for Coffee Plantation

Development of Low-cost and Robust IoT Field Station for Cof...

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International Conference on Knowledge and Smart Technology (KST)

作者： Satetha Siyang Teerakiat Kerdcharoen Materials Science and Engineering Program Faculty of Science Mahidol University Bangkok 10400 Thailand Department of Physics Faculty of Science and Research Network of NANOTEC Mahidol University National Nanotechnology Center Bangkok 10400 Thailand

Thailand has a growing demand in coffee consumption every year. Currently, the nation’s capacity for producing coffee is limited, necessitating a significant amount of imports from overseas. The Arabica coffee in the north of Thailand, where the scent and taste of coffee have a distinct identity based on varied cultivation locations, has reasonably good quality. Because of the impact of the environment, it is still challenging to maintain the quality of coffee beans from season to season. Moreover, fierce competition with nearby nations like Laos and Vietnam leads to lower prices of coffee beans. This forces Thai farmers and entrepreneurs to embrace more advanced technologies in order to comprehend the environment of each plantation region and boost their level of competition. This project aims to develop a trustworthy and cost-effective IoT field monitoring solution to assist farmers in understanding the climate conditions in various plantation areas. In order to examine the relationship between the environments, the data collected by the devices can be transferred back to the public cloud server. Then, it can be used as knowledge to raise Thai coffee beans’ quality to a premium level so they can continue to compete with coffee beans from other countries.

关键词： Cloud computing Agriculture Servers Monitoring Farming Meteorology

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