检索结果-内蒙古大学图书馆

Western New York Image Processing Workshop (WNYIPW)

作者： Debamitra Chakraborty Declan Walden Jing Cheng Julia Wallace Kiryl A. Niherysh Andrei V. Felsharuk Donats Erts Ivan Komissarov Roman Sobolewski Materials Science Graduate Program University of Rochester Rochester New York USA Laboratory for Laser Energetics Rochester New York USA Department of Physics and Astronomy University of Rochester Rochester New York USA Department of Biomedical Engineering University of Rochester Rochester New York USA Institute of Chemical Physics University of Latvia Riga Latvia Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden Department of Electrical and Computer Engineering University of Rochester Rochester New York USA

We report preliminary results of extracting electrical parameters like DC conductivity, mobility, and carrier concentration of single-layer graphene using Terahertz time-domain spectroscopy (THz-TDS) in transmission geometry. We utilize a simple Drude model and its extension, the Drude-Smith model, capable of accommodating charge carrier scattering by optical and acoustic phonons to describe the complex conductivity in graphene. We observed that a significant area of the sample scanned followed the Drude-Smith behavior, while at a few locations, the simple Drude behavior prevailed. We identified possible reasons that might contribute to this observation, like defects, the presence of polymer residue on the sample, or the sample strain. This research sheds new light on our understanding of graphene's electrical properties and lays the foundation for future investigations addressing defects and contaminants in graphene samples.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Designing the pressure-dependent shear modulus using tessellated granular metamaterials

arXiv

引用

arXiv 2023年

作者： Zhang, Jerry Wang, Dong Jin, Weiwei Xia, Annie Pashine, Nidhi Kramer-Bottiglio, Rebecca Shattuck, Mark D. O’Hern, Corey S. Department of Mechanical Engineering & Materials Science Yale University New HavenCT06520 United States Benjamin Levich Institute and Physics Department The City College of New York New YorkNY10031 United States Department of Physics Yale University New HavenCT06520 United States Department of Applied Physics Yale University New HavenCT06520 United States Integrated Graduate Program in Physical and Engineering Biology Yale University New HavenCT06520 United States

Jammed packings of granular materials display complex mechanical response. For example, the ensemble-averaged shear modulus 〈G〉 increases as a power-law in pressure p for static packings of soft spherical particles that can rearrange during compression. We seek to design granular materials with shear moduli that can either increase or decrease with pressure without particle rearrangements even in the large-system limit. To do this, we construct tessellated granular metamaterials by joining multiple particle-filled cells together. We focus on cells that contain a small number of bidisperse disks in two dimensions. We first study the mechanical properties of individual disk-filled cells with three types of boundaries: periodic boundary conditions (PBC), fixed-length walls (FXW), and flexible walls (FLW). Hypostatic jammed packings are found for cells with FLW, but not in cells with PBC and FXW, and they are stabilized by quartic modes of the dynamical matrix. The shear modulus of a single cell depends linearly on p. We find that the slope of the shear modulus with pressure, λc c > 0, as well as λc © 2023, CC BY.

关键词： Elastic moduli

来源：评论

学校读者我要写书评

暂无评论

Mechanical Plasticity of Cell Membranes Enhances Epithelial Wound Closure

arXiv

引用

arXiv 2023年

作者： Ton, Andrew T. MacKeith, Arthur K. Shattuck, Mark D. O'Hern, Corey S. Department of Physics Yale University New HavenCT06520 United States Integrated Graduate Program in Physical and Engineering Biology Yale University New HavenCT06520 United States Department of Mechanical Engineering & Materials Science Yale University New HavenCT06520 United States Benjamin Levich Institute and Physics Department The City College of New York New YorkNY10031 United States Department of Applied Physics Yale University New HavenCT06520 United States

During epithelial wound healing, cell morphology near the healed wound and the healing rate vary strongly among different developmental stages even for a single species like Drosophila. We develop deformable particle (DP) model simulations to understand how variations in cell mechanics give rise to distinct wound closure phenotypes in the Drosophila embryonic ectoderm and larval wing disc epithelium. We find that plastic deformation of the cell membrane can generate large changes in cell shape consistent with wound closure in the embryonic ectoderm. Our results show that the embryonic ectoderm is best described by cell membranes with an elasto-plastic response, whereas the larval wing disc is best described by cell membranes with an exclusively elastic response. By varying the mechanical response of cell membranes in DP simulations, we recapitulate the wound closure behavior of both the embryonic ectoderm and the larval wing disc. © 2023, CC BY-NC-ND.

关键词： Cytology

来源：评论

学校读者我要写书评

暂无评论

Mosaic ballistic ceramics: A review

Journal of Alloys and Compounds Communications

引用

Journal of Alloys and Compounds Communications 2024年 3卷

作者： Alexander B. Dresch Fernando Otávio Pizzatto Janio Venturini Oscar R.K. Montedo Sabrina Arcaro Carlos P. Bergmann Graduate Program in Mining Metallurgical and Materials Engineering Universidade Federal do Rio Grande do Sul Porto Alegre Brazil Graduate Program in Materials Science and Engineering Universidade do Extremo Sul Catarinense Criciúma Brazil School of Natural Sciences Department of Chemistry Technical University of Munich Garching bei München Germany Department of Industrial Engineering Universidade Federal do Rio Grande do Sul Porto Alegre Brazil

The inherent fragility of ceramic materials is an obstacle to producing ceramics that are resistant and hard. Furthermore, the use of monolithic ceramic plate armour for ballistic applications is challenging because the protections need to resist multiple impacts. One of the solutions are mosaic ceramic armour systems, which consist of ceramic tiles arranged side by side. However, there is a wide variety of ceramic tile formats, as well as different dimensions. Unlike monolithic ceramics, mosaic systems present different behaviour when subjected to a ballistic event. As a result, their energy dissipation mechanisms and the properties necessary for this purpose are distinct. The main properties of ceramic tiles are hardness, modulus of elasticity, and fracture toughness, of which the latter, according to the analysis of figures of merit, must be as low as possible, as opposed to hardness and modulus of elasticity, which are desired to be as high as possible. We can efficiently take advantage of brittle fracture mechanisms to absorb the kinetic energy of the projectile during the tile fracture. Furthermore, the gap-filling material is extremely important, as it allows the confinement of the ceramic tiles and reduces the spread of damage. Numerical analysis is a great ally for the study of ballistic ceramics, and countless variables can be considered, enabling results very close to experimental ones at a low cost. Thus, it is possible to understand the key factors for producing more efficient ballistic ceramics as well as obtaining research data that can contribute to the evolution of the ballistic protection sector. In this context, this work presents a review of ceramic mosaics for ballistic amours.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Giant Deep-Ultraviolet Circular Dichroism in Synthetic Architectures of Ordered Carbon Nanotubes

Giant Deep-Ultraviolet Circular Dichroism in Synthetic Archi...

引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Doumani, Jacques Lou, Minhan Dewey, Oliver Hong, Nina Fan, Jichao Baydin, Andrey Pasquali, Matteo Yomogida, Yohei Yanagi, Kazuhiro Saito, Riichiro Kono, Junichiro Gao, Weilu Department of Electrical and Computer Engineering Rice University HoustonTX United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX United States Department of Electrical and Computer Engineering The University of Utah Salt Lake CityUT United States Carbon Hub Rice University HoustonTX United States Department of Chemical and Biomolecular Engineering Rice University HoustonTX United States J.A. Woollam Co. LincolnNE United States The Smalley-Curl Institute Rice University HoustonTX United States Department of Chemistry Rice University HoustonTX United States Department of Materials Science and NanoEngineering Rice University HoustonTX United States Department of Physics and Astronomy Tokyo Metropolitan University Tokyo Japan Department Physics Tohoku University Sendai Japan Department Physics and Astronomy Rice University HoustonTX United States

We demonstrate tunable, giant, and structure-induced deep-ultraviolet circular dichroism in macroscopically chiral assemblies of racemic carbon nanotubes prepared using two approaches: mechanical-rotation-assisted vac... 详细信息

ISBN: (纸本)9781957171258

关键词： Dichroism

来源：评论

学校读者我要写书评

暂无评论

Nonclassical Hydrogen Bond-Based Efficient Solid-State Organic Emitters Enabled by a Synergistic Anion and Mechanical Bond Effect

引用

Angewandte Chemie 2025年第23期137卷

作者： Yi An Ru Zhou Ningjin Zhang Aocheng Chen Junfei Xing Shu Zhang Quan Li Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China School of Ecological and Environmental Sciences East China Normal University Shanghai 200062 China Materials Science Graduate Program Kent State University Kent Ohio 44242 USA

Traditional fluorophores often face aggregation-caused quenching (ACQ), limiting their efficacy in high-concentration applications. We demonstrate that a combined effect of anion and mechanical bond can significantly increase fluorescence intensity, up to 14-fold, and a quantum yield of 97.0%. A large number of crystal analyses reveal that this enhancement is primarily driven by nonclassical hydrogen bonds, which stabilize the structure and restrict molecular motion. The versatility of this synergistic effect opens up new avenues for applications, including circularly polarized luminescence (CPL) facilitated by chiral anions and the development of a fluorescence switchable rotaxane shuttle-based stimuli-responsive material.

关键词： Anion Circularly polarized luminescence Mechanical bond Nonclassical hydrogen bond Stimuli-responsive materials

来源：评论

学校读者我要写书评

暂无评论

Effect of Ammonium Formate Addition on Corrosion Behavior of Trivalent Chromium Coatings Electrodeposited in Deep Eutectic Solvents

引用

International Journal of Electrochemical science 2022年第7期17卷

作者： Sheu, Hung-Hua Lin, Tzu-Te Ger, Ming-Der Department of Chemical and Materials Engineering Chung Cheng Institute of Technology National Defense University Taoyuan Taiwan System Engineering and Technology Program National Yang Ming Chiao Tung University Hsin-Chu Taiwan Graduate School of National Defense Science Chung Cheng Institute of Technology National Defense University Taoyuan Taiwan

The Cr thin films were electrodeposited from trivalent chromium deep eutectic solvents. The conditions of deep eutectic solvents divided into without water (specimen C1), added 15 wt% water (specimen C2), added 15 wt% water with ammonium formate (specimen C3). The HR-TEM shows the structure of “C1” is amorphous structure, and both “C2” and “C3” belong to nano-crystalline structure. The best corrosion resistance of Cr thin film is “C3” which icorr value is approximately at 3.69×10^-7 A/cm², the worst corrosion resistance of Cr thin film is “C1” which icorr value is approximately at 3.05×10^-5 A/cm², it can be attributed to “C3” has a dense structure and “C1” has a loose structure. The EIS analysis also presents “C3” has the best corrosion resistance. The reason for the large difference in corrosion resistance can be attributed to the loose structure of the "C1" thin film and the gaps of film is perpendicular to substrate, the dense structure of the "C3" thin film can effectively protect the substrate. Moreover, the addition of ammonium formate into trivalent chromium deep eutectic solvents will promote the reduction reaction of Cr ions and form a dense film © 2022. The Authors. Published by ESG (***). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://***/licenses/by/4.0/)

关键词： Ammonium formate Deep eutectic solvents Eis analysis

来源：评论

学校读者我要写书评

暂无评论

Title Biodecolorization of Biogas Power Plant Effluent Derived from Anaerobically Digested Distillery Wastewater by Natural Selected Pseudomonas Putida from Activated Sludge of the Wastewater Treatment Plant

SSRN

引用

SSRN 2023年

作者： Kumkaew, Ponruedee Suaisom, Pitchaya Mukkata, Kanokwan Koonaphapdeelert, Sirichai Sawatdeenarunat, Chayanon Nitayavardhana, Saoharit Master’s Degree Program in Environmental Engineering Faculty of Engineering Chiang Mai University Chiang Mai50200 Thailand Graduate School Chiang Mai University Chiang Mai50200 Thailand Energy Research and Development Institute – Nakornping Chiang Mai University Chiang Mai50200 Thailand Department of Environmental Engineering Faculty of Engineering Chiang Mai University Chiang Mai50200 Thailand Asian Development College for Community Economy and Technology Chiang Mai Rajabhat University Chiang Mai50300 Thailand Center of Excellence in Materials Science and Technology Chiang Mai University Chiang Mai50200 Thailand

The main aim of this study was to utilize naturally selected Pseudomonas putida strains isolated from activated sludge in a wastewater treatment plant, for the purpose of bioremediation of biogas effluent to remove organic content and color. Biogas effluent from anaerobically digestion of distillery wastewater treated with P. putida at the best evaluated condition (sample concentration of 50% v/v, agitation and aeration rates of 250 rpm and 1.0 vvm for 6 days) showed significant decolorization and organic removal efficacies of 34.29 ± 0.87% and 38.94 ± 0.63%, respectively. Bioremediation efficiency was dependent on bacterial growth which organic content in sample and dissolved oxygen during cultivation were key factors. The natural selected bacterium could tolerate higher organic content and work synergistically with other indigenous microorganisms found in the biogas effluent. Consequently, bioremediation of biogas effluent by natural selected P. putida is feasible to apply in biogas power plant where sterilization is not necessary in the process. © 2023, The Authors. All rights reserved.

关键词： Bioremediation

来源：评论

学校读者我要写书评

暂无评论

Alumina sol bonded castables for blast furnace main troughs. Part 1 - dispersants, gelling agents and secondary binders.

引用

Ceramics International 2025年

作者： L.B. Nascimento V.G. Domiciano V.C. Pandolfelli RHI Magnesita GmbH Technology Center Leoben Austria Federal University of São Carlos Graduate Program in Materials Science and Engineering São Carlos Brazil RHI Magnesita Research and Development Center Contagem Brazil

Calcium aluminate cement (CAC) is broadly used in refractory compositions due to its advantages, although CaO can affect the castable’s hot properties when silica is present. The need for higher-temperature applications and tougher conditions has led to innovations in high-performance materials, focusing on reducing CAC content and using binders without CaO or SiO 2 . Although progress has been made in their application, these binders still have limitations. Colloidal alumina is particularly promising for generating a silica-free system with higher refractoriness and lower liquid phase formation, depending on the refractory composition. Based on these aspects, this work evaluated the influence of using colloidal alumina as a binder in refractory castables (Al 2 O 3 -SiC-C) for blast furnace main troughs, comparing its properties to a commercially available silica sol castable. The influence of different dispersants, gelling agents and secondary binders on the properties of both sol-bonded castables was investigated. The results indicated that citric acid was the most effective dispersant in providing suitable rheological behavior based on its interaction with alumina particles (electrostatic mechanism), magnesia sinter and calcium aluminate cement. Furthermore, using optimized amounts of citric acid, MgO and CAC, a colloidal alumina-bonded refractory composition with higher green mechanical strength and suitable working time was obtained compared to the colloidal silica castable used as reference.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Unravelling Exothermic Reaction Dynamics in Polyurethane Polymerization: A Thermo-Kinetic Simulation Approach

SSRN

引用

SSRN 2023年

作者： Mendija, Leanne Christie C. Dingcong, Roger G. Alfeche, Fortia Louise Adeliene M. Al-Moameri, Harith H. Dumancas, Gerard G. Malaluan, Roberto M. Alguno, Arnold C. Lubguban, Arnold A. Center for Sustainable Polymers Mindanao State University Iligan Institute of Technology Iligan City9200 Philippines Material Science and Engineering Program Graduate School of Engineering Mindanao State University Iligan Institute of Technology Iligan City9200 Philippines Department of Materials Engineering Mustansiriyah University Baghdad10052 Iraq Department of Chemistry The University of Scranton ScrantonPA18510 United States Department of Chemical Engineering and Technology Mindanao State University Iligan Institute of Technology Iligan City9200 Philippines Department of Physics Mindanao State University Iligan Institute of Technology Iligan City9200 Philippines

The pursuit of sustainable polyurethane product development necessitates a profound understanding of precursor materials, particularly polyol since polyurethane properties are heavily influenced by the type of polyol employed during polyurethane production. While traditional polyurethanes are solely derived from hydroxyl functionalized polyols, the emergence of amine-hydroxyl hybrid polyols has garnered significant attention due to their potential for enhancing polyurethane product properties. These hybrid polyols are characterized by the presence of both amine and hydroxyl functional groups. However, characterizing these polyols remains a daunting challenge due to the lack of established experimental testing standards for properties, such as fractional hydroxyl and amine moieties, and thermo-kinetic parameters for amine reactions with isocyanates. To bridge these gaps, this study employed a computational simulation approach to determine the fractions of moieties in both traditional and hybrid polyols. Additionally, this study determined the thermo-kinetic parameters for exothermic isocyanate reactions with amine moieties in hybrid polyols. The computational method integrated energy balance and reaction kinetics analysis for various polyols to elucidate the influence of functional moieties on the thermo-kinetic behavior of polyurethane formations. Validation of the simulated results was conducted by comparing their experimental and simulated gel and foam temperature profiles, highlighting the direct influence of fractional moieties on polyurethane formations. The comparisons revealed an average relative error of less than 5%, indicating the accuracy and credibility of the simulation. Thus, this study represents a pivotal opportunity for advancing knowledge and driving sustainable developments in biobased polyol characterization for polyurethane production streamlining and formulation optimization. © 2023, The Authors. All rights reserved.

关键词： Polymerization

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：