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European Conference on Antennas and Propagation, EuCAP

作者： ryosuke Hasaba Ken Takahashi Tomoki Abe Tomohiro Murata Yoichi Nakagawa Koji Takinami Hiroshi Taneda Takashi Tomura Issei Watanabe Engineering Division Panasonic Industry Co. Ltd. Yokohama Japan Development Center Panasonic System Networks R&D Lab. Co Kanazawa Japan Research & Development Div. Shinko Electric Industries Co. Ltd. Nagano Japan Department of Electrical and Electronic Engineering Institute of Science Tokyo Tokyo Japan Advanced ICT Research Institute National Institute of Information and Communications Technology Tokyo Japan

ISBN: (数字)9788831299107

ISBN: (纸本)9798350366327

This paper proposes a dual-polarized antenna for d-band applications, which radiates in the substrate end direction. The antenna's radiating elements and ground are formed using vias, via lands, and copper foil. The radiating element features a cross-grid design, which combines both cross and grid shapes. This allows for the adjustment of the resonant frequency for each polarization, even under manufacturing rule constraints. The characteristics and operation of a singleelement antenna were demonstrated through simulations. Subsequently, the gain of an 8-element array was compared between measured and calculated values, demonstrating the effectiveness of the proposed antenna.

关键词： Antenna measurements Shape resonant frequency Microstrip antennas directive antennas Gain measurement Manufacturing Microstrip Substrates Antenna arrays

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Heavy metal (Pb, Cd and Cr) contamination and human health risk assessment of groundwater in Kuakata, southern coastal region of Bangladesh

Geosystems and Geoenvironment

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Geosystems and Geoenvironment 2025年第1期4卷

作者： Chowdhury, Ali Newaz Naher, Samsun Likhon, Md. Nur Alam Hassan, Jubairul Fariha, Zannati Nur Hasan, Md. raisul Apon, Tanha dewan Bhuiyan, Md. Anwar Hossain Bhuiyan, Md Mesbah Uddin Department of Oceanography Noakhali Science and Technology University Noakhali 3814 Bangladesh Pulp and Paper Research Division Bangladesh Council of Scientific and Industrial Research Laboratories Dhaka 1205 Bangladesh Research and Development (R&D) GeoCore Research Center (GCRC) Dhaka 1214 Bangladesh Department of Geology University of Dhaka Dhaka 1000 Bangladesh

This study investigates the quality of groundwater in Kuakata, a coastal area in southwestern Bangladesh, by analyzing the levels of lead (Pb), cadmium (Cd), and chromium (Cr) in 50 groundwater samples. The concentrations of these heavy metals were determined using atomic absorption spectrometry. The results indicated that while cadmium was not detected, significant levels of lead and chromium exceeded recommended safety thresholds. The contamination was evaluated using several indices, including the heavy metal evaluation index (HEI), heavy metal pollution index (HPI), and degree of contamination (C_d). Health risk assessments for adults and children revealed potential non-carcinogenic and carcinogenic risks, particularly from lead. This study provides essential data to guide groundwater management and improve public health in the region. The groundwater samples contain traces of additional heavy metals including lead and chromium. The lead concentration ranges from 0.0003 to 0.1049 mg/L, while chromium ranges from 0.00074 to 0.1828 mg/L. The levels of certain substances in groundwater exceeded the maximum limit set by international and local health authorities for safe drinking water. Heavy metal evaluation index (HEI), along with the degree of contamination (C_d) and heavy metal pollution index (HPI), were used to assess the pollution load. The results of HEI and HPI revealed that a significant portion of the samples in the study area, specifically 34% and 38%, were found to be strongly and seriously affected, whereas 38% samples were within the highest values (>4) of C_d. Based on the hazard index (HI) and incremental lifetime cancer risk (ICLr) values, the deep groundwater in the coastal area presents a notable health risk to the local population, particularly children. This study provides essential data that can be used as a foundation for developing effective groundwater management strategies in the coastal region, with the ultim

关键词： Cancer risk Coastal area Groundwater Heavy metals Pollution indexes

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Gold-Catalyzed Intramolecular Coupling reduction for direct Synthesis of Indole-Fused Iminosugars

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Journal of Organic Chemistry 2025年 2025 May 14页

作者： Feng, Lijing Zhou, Likai Yang, Weilin Huang, Xiaoyan Liu, Yuhui Wu, Jilai Wei, Chao Chen, Hua Key Laboratory of Chemical Biology of Hebei Province College of Chemistry and Material Science Hebei University Hebei Baoding 071002 China Functional Polymer Materials R&D and Engineering Application Technology Innovation Center of Hebei Province College of Chemical Engineering and Biotechnology Xingtai University Hebei Xingtai 054001 China Comprehensive Experimental Center Hebei University Hebei Baoding 071002 China

In the presence of Hantzsch ester and with JohnPhosAuCl/AgOMs as catalysts, a series of indole-fused iminosugars were obtained in good yields by the intramolecular reductive coupling reaction of iminosugar C-glycoside, in which the terminal alkyne could be coupled with indole and further reduced to methyl. The substrates of iminosugar C-glycosides were conveniently prepared by a three-component reaction of tosylated/mesylated sugar, propargylamine, and indole derivatives. The advantages of this protocol are its simplicity and efficiency in constructing the complex indole-fused iminosugars. © 2025 American Chemical Society.

关键词： Catalysis

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Investigation on cutting fluid use in finish milling of polylactide (PLA) 3d-printed parts

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Procedia CIrP 2025年 133卷 656-661页

作者： Margaux Lorenzoni Laurent Spitaels Edouard rivière-Lorphèvre Jérémy Odent rachid M’Saoubi Liam Cloëz Michaël Fontaine François ducobu Machine Design and Production Engineering Lab – Research Institute for Materials Science and Engineering University of Mons Place du Parc 20 7000 Mons Belgium Laboratory of Polymeric and Composite Materials (LMPC) – Center of Innovation and Research in Materials and Polymers (CIRMAP) University of Mons Place du Parc 20 7000 Mons Belgium R&D Material and Technology Development Seco Tools AB Björnbacksvägen 2 SE-737 82 Fagersta Sweden Department of Mechanical Engineering Sciences - Division of Production and Materials Engineering Lund University Ole Römers väg 1 SE-221 00 Lund Sweden FEMTO-ST Institute – Applied Mechanics Dept. Université de Franche-Comté – SUPMICROTECH – CNRS Rue de l’épitaphe 24 F-25000 Besançon France

Fused Filament Fabrication (FFF) is an additive manufacturing process based on material Extrusion (MEX) of polymeric filament. This manufacturing technology is commonly used for personalized production applications and prototyping, allowing to obtain customized parts with complex geometries at a low cost. However, this production technique has its limitations regarding dimensional accuracy and surface roughness of the final parts. To overcome these limitations, finish milling is considered to be a promising technique as it is widely used for metallic parts. Yet, the specific thermal properties of polymers such as low thermal conductivity and low melting temperature are adding a challenge in the determination of optimal cutting conditions. In this context, the use of cutting fluid could be the key to keep the material from melting during milling. Therefore, this paper proposes to compare the impact of using a compressed air flow to dry conditions on the cutting forces and the surface quality obtained on 3d-printed polylactide (PLA) parts. The qualification test of the tool-material couple standard (NF E 66-520-6) will be used as a guideline to determine the relevance of cutting fluid use for cutting conditions varying around an operating point. Moreover, simulated cutting forces using a mechanistic model will be compared to experimental data to evaluate the applicability of the model.

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Feasibility assessment of magnetite for enhancing the clean utilization of lignite through anaerobic digestion

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International Biodeterioration and Biodegradation 2025年 203卷

作者： Zhang, Kai Guo, Hongyu Klitzsch, Norbert Xia, daping Hu, Zhazha Liu, Xiao Zhang, Bin Chen, Hao School of Energy Science and Engineering Henan Polytechnic University Jiaozuo454000 China Department of Resources and Mechanical Engineering Lyuliang University Shanxi Lvliang033001 China Science and Technology R&D Platform of Emergency Management Ministry for Deep Well Ground Control and Gas Extraction Technology Henan Polytechnic University Jiaozuo454000 China Institute for Applied Geophysics and Geothermal Energy RWTH Aachen University Aachen52074 Germany Research Institute of Petroleum Exploration & Development Beijing100083 China

This study pioneers the application of magnetite in anaerobic digestion of lignite, achieving dual enhancement of biomethane production and coal-derived waste valorization. At an optimal dosage of 2 g, magnetite increased cumulative methane yield by 55.4 % compared to the control, driven by selective enrichment of electroactive bacteria such as norank_f_Synergistaceae and Proteiniclasticum, alongside dIET-driven methanogens dominated by Methanosaeta at 86.29 % abundance. Concurrently, magnetite induced structural modification of lignite through degradation of recalcitrant aliphatic hydrocarbons and a 53.5 % increase in specific surface area from 7.772 to 11.924 m2/g, collectively improving the combustion efficiency of residual coal. These findings establish magnetite as a bifunctional catalyst that unlocks the bioenergy potential of low-rank coals while converting residual waste into cleaner solid fuels. The strategy offers coal-intensive regions a sustainable pathway to integrate biogas production with circular coal waste management. © 2025 Elsevier Ltd

关键词： Lignite

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HOT MACHINING PrOCESS FOr IMPrOVEd METAL rEMOVAL rATES IN TUrNING OPErATIONS

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JOUrNAL OF materialS PrOCESSING technology 1994年第3-4期44卷 199-206页

作者： MAdHAVULU, G AHMEd, B Technology Development Laboratory Bharat Heavy Electricals Ltd. Corporate R&D Division Vikasnagar Hyderabad -500 593 India

This paper deals with the Hot Machining Process, for turning operations, which is designed to give improved metal removal rates, particularly on difficult-to-machine metals. A high temperature plasma arc is used to provide intense localised heat, softening only the chip material, leaving the work piece relatively cool and metallurgically undamaged. The advantages of plasma arc hot machining are increased metal removal rates, machining hard and tough metals, increase in tool life, suitable for interrupted cuts etc... This paper discusses the results of productivity studies and economic viabilities of the Hot Machining Process.

关键词： Machining

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In Situ Engineering of a 3d Branched Polyimide/Silver Interface Layer with dual Ion-Electron Conductivity for Superior Structural Integrity and Long-Cycle Stability of Silicon Anodes

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Advanced Functional materials 2025年

作者： Kang, Yongjun Lin, daolei Liu, Bingxue dong, Nanxi Zhao, Zheng Tian, Guofeng Qi, Shengli Wu, dezhen State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China China Automotive Battery Research Institute Co. Ltd Beijing 101407 China ENFI R&D Institute China ENFI Engineering Corporation Beijing 100038 China Beijing Zeqiao Medical Technology Co. Ltd Beijing Economic and Technological Development Zone Beijing 100176 China Changzhou Institute of Advanced Materials Beijing University of Chemical Technology Jiangsu Changzhou 213164 China

Silicon (Si) has been regarded as a remarkable potential anode material for next-generation lithium-ion batteries (LIBs) owing to its exceptional capacity. However, overcoming excessive volume expansion and continuous interfacial side reactions is a prerequisite for achieving practical applicability. Herein, an ion-electron dual conductive 3d crosslinked interface layer (PMTI-Ag), derived from branched polyimide (abbreviated as PMTI) and silver (Ag), is synthesized by copolymerizing pyromellitic dianhydride (PMdA), 4,4′-oxydianiline (OdA), poly(dimethylsiloxane)etherimide (dMS), and 1,3,5-tris(4-aminophenoxy) benzene (TAPOB). Trifluoroacetylacetonate silver (AgTFA) is incorporated and in situ reduced to form ultra-small silver nanoclusters within the PMTI. The 3d crosslinked network of PMTI-Ag contains abundant aromatic benzene rings, which provide excellent modulus and toughness. The flexible Si-O-Si segments in dMS provide elasticity to accommodate volume expansion of Si. The uniform distribution of nanosilver enhances charge-carrier mobility and promotes the formation of a robust solid electrolyte interface (SEI). The Si@PMTI-Ag anode exhibits long-term cycling stability with a specific capacity of 1103.9 mAh g⁻¹ after 350 cycles at 1 A g⁻¹, and this strategy is also suitable for enhancing SiO_x anodes achieving a capacity retention of 89.3% after 400 cycles at 1 C. Moreover, the Si@PMTI-Ag//LiNi_0.8Mn_0.1Co_0.1O₂ pouch cell delivers an impressive 82.6% capacity retention after 100 cycles. © 2025 Wiley-VCH GmbH.

关键词： lithium-ion battery nanosilver modifier polyimide interface modification silicon-based anodes

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Exploring the Impact of Formulation and Tablet Shape on Tablet Integrity: A Comprehensive Investigation Using Mechanical and Imaging Techniques

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Journal of pharmaceutical sciences 2025年第7期114卷 103832页

作者： Mayank Singhal Joona Sorjonen Håkan Wikström Pratik Upadhyay Farhan Alhusban dean Murphy Luis Martin de Juan Jarkko Ketolainen Pirjo Tajarobi Early Product Development and Manufacturing Pharmaceutical Sciences BioPharmaceuticals R&D AstraZeneca Macclesfield UK. Electronic address: mayank.singhal@***. School of Pharmacy University of Eastern Finland POB 1627 FI-70211 Kuopio Finland. Oral Product Development Pharmaceutical Technology & Development Operations & IT AstraZeneca Gothenburg Sweden. Technical Operations Science & Innovation Pharmaceutical Technology & Development Operations & IT AstraZeneca Macclesfield UK. Oral Product Development Pharmaceutical Technology & Development Operations & IT AstraZeneca Macclesfield UK. Early Product Development and Manufacturing Pharmaceutical Sciences BioPharmaceuticals R&D AstraZeneca Gothenburg Sweden.

Tablets are subjected to collisions during processing and handling which can result in defects and even failed batches at commercial scale. This study investigated the influence of composition and tablet shape on the tablet integrity under simulated stressed settings. Tablet formulations with two filler combinations were compressed to different shapes and tensile strengths. Tablet integrity was characterized using tensile strength, friability, drop test, impact testing, indentation and X-ray microtomography. Pharmacopeial tests demonstrated that all tablets including the lowest tensile strength tablets had acceptable integrity. Impact testing and drop test provided stressed conditions to discriminate and rank the tablet integrity according to the composition and shape. Microtomography and indentation results revealed heterogenous density distribution with respect to tablet shape and the composition. Increasing the amount of microcrystalline cellulose was the most successful approach to address tablet integrity issues. Tablet shape also influenced the number as well as the nature of tablet defects. Application of more discriminating tests could serve as extra tools to support selection of right tablet shape and composition. This can lead to the development of a robust formulation with potential to save resource required for troubleshooting tablet defect during both clinical and commercial supply.

关键词： Tablet(s) compression crushing strength materials science mechanical properties powder technology(s) tableting

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Spherical modification of tungsten powder by particle composite system

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rare Metals 2022年第6期41卷 1972-1976页

作者： Cong-Cong Wang Cheng-Chang Jia Peng Gao Guo-Sheng Gai Yu-Fen Yang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Powder Technology R&D Group Department of Material Science and EngineeringTsinghua UniversityBeijing 100084China

Owing to contradiction between increasing demand of spherical tungsten powder and limitation of traditional manufacturing technology,a novel preparation method was developed to sphericize the polygonal tungsten powder by means of modification of particle composite *** powder particles were modified by par-ticle composite system,and detailed characterization by scanning electron microscopy(SEM)was *** size distribution and function mechanism were analyzed,and the internal relationship between average diameter and processing time was *** results show that the spherical tungsten powder with an average diameter of 6.41μm is obtained from polyhedral tungsten powder with an average diameter of 7.50μ*** spherical effect could be achieved(sharp edge angles of particles are rounded off and reshaped)when the processing time is over 30 *** relationship between average diameter(d)and pro-cessing time can be described by the exponential decay model,which provides a good interpretation for the process of *** relationship between them can be expressed by the equation d=1.87406exp(-x/8.92718)+*** proposed method could readily enable large-scale production of spherical tungsten powder.

关键词： Tungsten powder Modification Average diameter Powder metallurgy

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Attribute driven inverse materials design using deep learning Bayesian framework

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npj Computational materials 2019年第1期5卷 22-35页

作者： Piyush M.Tagade Shashishekar P.Adiga Shanthi Pandian Min Sik Park Krishnan S.Hariharan Subramanya Mayya Kolake Next Gen Research Samsung Advanced Institute of TechnologySamsung R&D InstituteBangalore 560037India Autonomous Material Development Lab Samsung Electronics130 Samsung-roSuwonGyeonggi-do 443-803Republic of Korea

Much of computational materials science has focused on fast and accurate forward predictions of materials properties,for example,given a molecular structure predict its electronic *** is achieved with first principles calculations and more recently through machine learning approaches,since the former is computation-intensive and not practical for high-throughput *** for the right material for any given application,though follows an inverse path—the desired properties are given and the task is to find the right *** we present a deep learning inverse prediction framework,Structure Learning for Attributedriven materials design Using Novel Conditional Sampling(SLAMdUNCS),for efficient and accurate prediction of molecules exhibiting target *** apply this framework to the computational design of organic molecules for three applications,organic semiconductors for thin-film transistors,small organic acceptors for solar cells and electrolyte additives with high redox *** method is general enough to be extended to inorganic compounds and represents an important step in deep learning based completely automated materials discovery.

关键词： inverse learning enough

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