检索结果-内蒙古大学图书馆

Spherical modification of tungsten oxide powder and its mechanism analysis

rare Metals 2015年第3期34卷 183-188页

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

Owing to its high production costs, complexity of equipment, and difficulty in controlling parameters, spherical or subglobose tungsten powder preparation method cannot meet the demand of industrial production. Tungstic oxide powder was treated by particle composite system and its effects were studied. Morphologies of par- ticles were investigated by scanning electron microscopy （SEM）. Particle size analysis was carried out and the related mechanism was discussed. The results show that the processing effect is best when the rotational speed is set at 4,000 ***-1 for 15 rain： the powder particles become nearly spherical and their sharp edge angles are rounded off and reshaped. When the processing time is 60 min, the powders smash to pieces because of too much energy inputting. So the test results, such as grain size distribution, can be explained well. Nearly spherical tungsten powder is obtained after reduction at 780 ℃ for 2 h and its flow ability is significantly improved.

关键词： Nearly spherical tungsten powder Grain size Modification Particle composite system

来源：评论

学校读者我要写书评

暂无评论

Establishing a Certification System for the Field Project of Outdoor Battery Energy Storage System

Establishing a Certification System for the Field Project of...

引用

Power, Energy and Electrical Engineering (CPEEE), International Conference on

作者： Wei-Shan Lin Liang-Yang Lin Pei-Jen Wang Wei-Hung Wu Chung-Hsien Chen Ching-Hua Lin Department of Power Mechanical Engineering National Tsing Hua University Hsinchu Taiwan Inspection Technology Division Bureau of Standards Metrology and Inspection MOEA Taipei Taiwan Intelligence and System R&D Service Department Metal Industries Research & Development Centre Taichung Taiwan Metrology Section Hsinchu Branch Bureau of Standards Metrology and Inspection MOEA Hsinchu Taiwan

ISBN: (数字)9798331520090

ISBN: (纸本)9798331520106

Taiwan actively promotes energy transformation and net zero emissions. Generating 15.1% of energy using renewable sources by 2025 and reducing net zero emissions by 2050 is a goal set by Taiwan. Solar, Wind, and other renewable energy sources will be built on a large scale. The intermittent supply features of renewable energy will affect the traditional power grid. An energy storage system is a key technology to reduce the influence of intermittent renewable energy on the power grid, it can solve the problem of integrating renewable energy with the power grid on a large scale. Currently, the technological development of energy storage systems shows a diverse trend. In Taiwan, an energy storage system with a lithium battery is the first choice for most enterprises. Therefore, a certification system for outdoor battery energy storage system field project is proposed in this research for the outdoor grid-integrated energy storage system. This certification system adopts a three-stage certification method, including a design review before construction, field certification after completion, and regular test every two years. It guarantees the safety of the energy storage system and its related equipment. It facilitates the energy storage system industry's development and renewable energy policies.

关键词： renewable energy sources reviews Battery energy storage system Net zero Lithium batteries Power grids Safety Certification Standards Energy storage

来源：评论

学校读者我要写书评

暂无评论

CeVO₄/TiO₂/SnS based nanostructured ternary photoelectrode and photocatalyst for photoelectrochemical O₂ and photocatalytic H₂ evolution by solar energy

引用

Inorganic Chemistry Communications 2025年 179卷

作者： Yıldız, Ayşe Çiçek Çakar, Soner Zonguldak Bülent Ecevit University Faculty of Science Department of Chemistry Zonguldak 67100 Turkey Sakarya University Biomaterials Energy Photocatalysis Enzyme Technology Nano & Advanced Materials Additive Manufacturing Environmental Applications and Sustainability Research & Development Group (BIOENAMS R&D Group) Sakarya 54050 Turkey

Energy demand is on the rise all over the world. Nevertheless, using renewable energy sources has become increasingly important in the recent years because of the fast depleting fossil fuels. Hydrogen energy is particularly noteworthy among renewable energy sources. due to the cost of hydrogen storage cost, various hydrogen generation techniques are being developed. research into systems that can provide alternatives to hydrogen production using energy derived from fossil fuels has accelerated in recent years. The generation of H₂ and O₂ from water through photoelectrochemical means is an innovative and environmentally friendly approach. This study used the hydrothermal method to synthesize nanostructures with three different properties: CeVO₄, TiO₂, and SnS. different n-type and/or p-type photoelectrochemical systems with nanostructures of varying properties were applied to indium tin oxide (ITO) substrates to examine their impact on the water dissociation reaction. Various semiconductor structures were analyzed for their properties through the study of H₂ production using the photocatalytic method and O₂ production using the photoelectrochemical method. Ternary photocatalyst and photoelectrode studies were conducted using semiconductors with varying band gaps and chemical activities to enhance both hydrogen evolution reaction (HEr) and oxygen evolution reaction (OEr) efficiencies. Semiconductor-based nanostructures were synthesized via the hydrothermal method and characterized using X-ray diffraction (Xrd), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), diffused-reflectance spectroscopy (drS) and Mott-Schottky techniques. For OEr measurements, these semiconductor systems were applied as a thin film on ITO glass using a spin coating device. Characterization measurements of photocatalytic and photoelectrochemical ac

关键词： CeVO4 Chalcogenide Photocatalytic H2 evolution Photoelectrochemical O2 evolution SnS TiO2

来源：评论

学校读者我要写书评

暂无评论

dual-Polarized Microstrip Antenna with Cross Grid Structure radiating Towards the Edge of the Substrate in the d-Band

Dual-Polarized Microstrip Antenna with Cross Grid Structure ...

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

HOT MACHINING PrOCESS FOr IMPrOVEd METAL rEMOVAL rATES IN TUrNING OPErATIONS

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Spherical modification of tungsten powder by particle composite system

引用

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

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：