检索结果-内蒙古大学图书馆

Growth of Wafer-Scale Single-Crystal 2D Semiconducting Transition Metal Dichalcogenide Monolayers

Advanced Science 2024年第11期11卷 e2307839页

作者： Singh, Jitendra Astarini, Nadiya Ayu Tsai, Meng-Lin Venkatesan, Manikandan Kuo, Chi-Ching Yang, Chan-Shan Yen, Hung-Wei Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei City106335 Taiwan Department of Physics Udit Narayan Post Graduate College Padrauna Uttar Pradesh Kushinagar274304 India Department of Molecular Science and Engineering Institute of Organic and Polymeric Materials National Taipei University of Technology Taipei City106344 Taiwan Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei City11677 Taiwan Department of Materials Science and Engineering National Taiwan University Taipei City106319 Taiwan

Due to extraordinary electronic and optoelectronic properties, large-scale single-crystal two-dimensional (2D) semiconducting transition metal dichalcogenide (TMD) monolayers have gained significant interest in the development of profit-making cutting-edge nano and atomic-scale devices. To explore the remarkable properties of single-crystal 2D monolayers, many strategies are proposed to achieve ultra-thin functional devices. Despite substantial attempts, the controllable growth of high-quality single-crystal 2D monolayer still needs to be improved. The quality of the 2D monolayer strongly depends on the underlying substrates primarily responsible for the formation of grain boundaries during the growth process. To restrain the grain boundaries, the epitaxial growth process plays a crucial role and becomes ideal if an appropriate single crystal substrate is selected. Therefore, this perspective focuses on the latest advances in the growth of large-scale single-crystal 2D TMD monolayers in the light of enhancing their industrial applicability. In the end, recent progress and challenges of 2D TMD materials for various potential applications are highlighted. © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.

关键词： Single crystals

来源：评论

学校读者我要写书评

暂无评论

Problem-Based Learning with Argumentation Skills to Improve Students' Concept Understanding 1

Problem-Based Learning with Argumentation Skills to Improve ...

引用

1st Young Scholar Symposium on Transdisciplinary in Education and Environment 2018, YSSTEE 2018

作者： Pratiwi, S.N. Cari, C. Aminah, N.S. Affandy, H. Physics Education Department of Post Graduate Program Sebelas Maret University Indonesia Physics Department of Post Graduate Program Sebelas Maret University Jl. Ir. Sutami 36A Kentingan Jebres Surakarta57126 Indonesia

Understanding students' concepts can be achieved well, one of them is by applying Problem Based Learning. With Problem Based Learning, students can be actively involved in learning. This article discusses the Problem Based Learning that applies argumentation skills to improve understanding of the buoyant style concept of high school students. With the right learning steps in accordance with the syntax of Problem Based Learning, understanding of concepts will be achieved in students. Besides that, it involves students' skills in the cognitive, affective, and psychomotor domains. One of the skills analyzed is argumentation skills. In this study, the argumentation skill in problem-based learning is high, which is 0.639 which means that the relationship between the skills of argumentation in problem-based learning is very good. Each activity is expected to facilitate students to develop an understanding of students' scientific concepts such as observing, concluding, predicting, asking questions, constructing hypotheses, designing experiments, applying concepts, and communicating. Problem Based Learning with argumentation skills can improve students' understanding of concepts. © Published under licence by IOP Publishing Ltd.

关键词： Students

来源：评论

学校读者我要写书评

暂无评论

Analysis of seismicity level and return period of bengkulu area earthquake from 1960-2017 1

Analysis of seismicity level and return period of bengkulu a...

引用

1st Sriwijaya International Conference on Basic and Applied Sciences, SICBAS 2018

作者： Patrisia, Desy Sailah, Siti Affandi, Azhar K. Post Graduate Physics Study Program Faculty of Mathematics and Natural Sciences Postgraduate of Sriwijaya University Indonesia

In this research, seismicity and the return period of earthquake in Bengkulu and surrounding areas has been analyzed using the relationship between the frequency and the magnitude of earthquakes. Study area is at coordinate points of 1,1-6,4 SL and 99,5 - 104,9 EL, whereas the earthquake data used is limited only to 5.0 SR magnitude and 100 km depth from 1960-2017 sourced catalog data from United States Geological Survey (USGS) and using the Zmap Matlab 2007Rb software program. The analysis results that spatial variation b-value is 0,6-2, a-value is 5-15 while magnitude of Completeness is 5,1. And return period of earthquake with magnitude 5 ranges from 0,2-0,5 years, magnitude 5,5 ranges from 1,5-3,5 2-4 years, magnitude 6 ranges from 6-12 years, magnitude 6,5 ranges from15-25 years and magnitude 7 ranges from 10-20 years, magnitude 7,5 ranges from 30-50 years, and magnitude 8 and 8,5 ranges from 100-150 years. Hence the results show that Bengkulu area is an area with high stress level and relatives high magnitude level. © Published under licence by IOP Publishing Ltd.

关键词： Earthquakes

来源：评论

学校读者我要写书评

暂无评论

Pulmonary Disease Pattern Recognition on X-Ray Radiography Image Using Artificial Neural Network (ANN) Method 3

Pulmonary Disease Pattern Recognition on X-Ray Radiography I...

引用

3rd Annual Scientific Meeting on Medical physics and Biophysics, PIT-FMB in conjunction with the 17th South-East Asia Congress of Medical physics, SEACOMP 2019

作者： Fitriyah, N. Kurniawati, L.D. Purwanti, E. Astuti, S.D. Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia Biomedical Engineering Study Program Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia Department of Biomedical Engineering Post-Graduate Program Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia

This research aims to recognize the pattern of pulmonary disease on x-ray radiography image using artificial neural network (ANN) method. The images, which were used such as images of healthy pulmonary, pulmonary tuberculosis, and pulmonary tumour. Pattern recognition was using an extraction feature of GLCM (Gray Level Co-occurrence Matrix) and back propagation method. Before being identified, the images were processed by median filter and adaptive histogram equalization. The GLCM features that used were homogeneity, energy, contrast, variance and correlation. The parameters were learning rate and hidden layer. Learning rate was 0.3 and hidden layer was 25. Back propagation training showed 100% accuracy, which all of 44 images were used had been successfully identified. From the result, the healthy pulmonary showed 60% accuracy, 83.3% for pulmonary tuberculosis and 100% for pulmonary tumor. Hence, the overall result showed 81.25% accuracy, which 13 of 16 images had been successfully identified. From these result, extraction feature of GLCM using back propagation method was capable to recognize the pattern of pulmonary disease. However, due to narrow range of the feature, this application may not be used optimally for comparing features in every category of images. Therefore, the further research is needed to determine the best features and parameters of training back propagation. © Published under licence by IOP Publishing Ltd.

关键词： Pattern recognition

来源：评论

学校读者我要写书评

暂无评论

Enhanced Physical, Electrical, and Structural Properties of Chitosan Thin Films Doped with Ag@Zno Nanoparticles for Supercapacitor Applications

SSRN

引用

SSRN 2024年

作者： Assis, Danielle Alves, Severino Cardozo, Olavo da Silva, Romário Justino Maia, Ricardo Stingl, Andreas de Melo, Celso Pinto Farias, Patricia M.A. Post Graduate Program on Material Sciences CCEN Federal University of Pernambuco University City Pernambuco Recife50.670-901 Brazil Department of Fundamental Chemistry Federal University of Pernambuco University City Pernambuco Recife50.740-560 Brazil Department of Physics Federal University of Pernambuco University City Pernambuco Recife50.670-901 Brazil Phornano Holding GmbH Kleineingersdorfer straße Korneuburg2100 Austria Department of Biophysics and Radiobiology Federal University of Pernambuco University City Pernambuco Recife50.670-901 Brazil

Chitosan thin films doped with varying concentrations (0, 2, 5, 7, and 10\%) of silver-doped zinc oxide (Ag@ZnO) nanoparticles (NPs) were synthesized using the Solution Casting method. Analyses revealed that increased doping enhanced the films’ physical, electrical, and structural properties. X-ray diffraction (XRD) confirmed the wurtzite hexagonal structure of Ag@ZnO NPs. Photoluminescence showed charge transfer between chitosan and NPs, with emissions in the blue and violet ranges. UV-VIS spectroscopy indicated improved barrier effects, while Tauc plot analysis showed a decrease in the band gap with higher doping. Fourier-transform infrared (FT-IR) analysis confirmed strong interactions between chitosan and nanoparticles. Impedance testing demonstrated increased conductivity with higher Ag@ZnO NP concentrations. These results suggest that doping chitosan films with Ag@ZnO NPs effectively modulates impedance and conductivity while maintaining flexibility, making them suitable for efficient electrolyte separators in supercapacitors. © 2024, The Authors. All rights reserved.

关键词： ZnO nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Tailoring structural and magnetic properties of NiCu nanowires by electrodeposition

引用

Nano-Structures and Nano-Objects 2024年 39卷

作者： Castro-Lopes, S. Oliveira, D.M. Abrão, J.E. Assis, L.K.C.S. Silva, J.F.O. Neves-Araújo, J. Soares, J.M. Rodrigues, A.R. Padrón-Hernández, E. Federal Institute of Education Science and Technology of Pará (IFPA) PA Altamira 68371-441 Brazil Materials Science Post-Graduate Program Center of Exact and Natural Sciences Federal University of Pernambuco PE Recife 50740-540 Brazil Department of Physics Federal University of Pernambuco PE Recife 50740-540 Brazil University of Pernambuco Polytechnic School of Pernambuco (POLI) PE Recife 50720-001 Brazil NANOlab Center of Excellence Department of Physics University of Antwerp Groenenborgerlaan 171 Antwerp B-2020 Belgium Department of Physics State University of Rio Grande do Norte RN Mossoró 59610-190 Brazil

In this work, we investigated the tailoring of structural and magnetic properties of NiCu nanowires through electrodeposition. Continuous (S1) and composition-modulated (S2) wires were fabricated by electrodeposition using porous alumina membranes as a template. Morphological characterization revealed that the total length of the wires was 8 ± 3 µm in both S1 and S2. For the composition-modulated wires, the length of the segments with the lowest and highest Cu concentrations was 1.2 ± 0.4 µm and 226 ± 65 nm, respectively. Mapping by energy dispersive spectroscopy (EDS) revealed that the concentration of copper and nickel varied along the length of the composition-modulated nanowires, while the continuous nanowires contained a relatively constant concentration of both metals. It is demonstrated that the change in Cu concentration along the wire modifies the lattice parameter, average crystallite size (D) and lattice strain (ε) of Ni. This result is pivotal for understanding the magnetic properties of the wires, as nickel is primarily responsible for the magnetic behavior of the wires. From the ferromagnetic resonance (FMR) results, the linewidth and resonance field values for samples S1 and S2 were determined. It was demonstrated that the greater deformation in the nickel lattice in NiCu nanowires increases the angular dependence of the resonance field. Furthermore, the smaller nickel crystallite size was shown to increase spin dispersion and magnetic damping, leading to complex behavior in FMR responses. Finally, it was demonstrated how Cu can influence the magnetic properties such as coercivity (H_C) and squareness (M_R/M_S) of the wires. Overall, this work contributes to understanding the tailoring of structural and magnetic properties of NiCu nanowires through electrodeposition. © 2024 Elsevier B.V.

关键词： Electrodeposition Magnetic properties Nanowires

来源：评论

学校读者我要写书评

暂无评论

Structural, Morphological, Optical, and Antibacterial Activities of Zinc Oxide Nanopowders: A Comparative Study of Green and Soft Chemical Synthesis

引用

Advances in Materials Science and Engineering 2022年第0期2022卷

作者： Siriya Pushpa, K. Catherine Sakthivel, P. Saravanakumar, K. Anuradha, N. Sankaranarayanan, R.K. Paulraj, Mosae Selvakumar Post-Graduate and Research Department of Physics Bon Secours College for Women Tamil Nadu Thanjavur613006 India Centre for Materials Science Department of Physics Science and Humanities Faculty of Engineering Karpagam Academy of Higher Education Coimbatore641021 India Mallasamudram Tamil Nadu Namakkal637503 India Centre for Nano Science and Technology Department of Chemistry Chennai Institute of Technology Tamil Nadu Kundrathur600069 India AUW Chemistry Hub Science and Math Program Asian University for Women Chattogram Bangladesh

Zinc oxide, a well-known inorganic metal oxide in nanoparticle form, has outstanding antibacterial properties. In this work, the authors focus on determining ZnO nanoparticles’ structural, optical, and antibacterial activity. A simple soft chemical route synthesizes C-ZnO nanoparticles chemically, while the green synthesis method is used to prepare G-ZnO nanoparticles. Ocimum tenuiflorum leaf extract was used to prepare G-ZnO nanopowders. These samples are investigated and compared in terms of their structural, morphological, optical, and antibacterial properties. According to XRD investigations, the synthesized ZnO nanopowders possess a hexagonal structure. The particle size of G-ZnO is smaller than that of C-ZnO nanoparticles. The XPS result revealed the binding and interactions between molecules. The FTIR study confirmed the presence of molecules and their vibrations. UV-vis-DRS spectroscopy was used to investigate optical properties such as reflectance and band gap. The grain size of the G-ZnO nanopowders was decreased, and oxygen vacancy was produced. The antibacterial efficiency of plant extracts against two different bacterial strains, S. aureus (Gram-positive) and *** (Gram-negative), has been studied and reported. Copyright © 2022 K. Catherine Siriya Pushpa et al.

关键词： ZnO nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Layered natural filter technique for reducing iron content level of the borehole water on peat area

引用

AIP Conference Proceedings 2023年第1期2646卷

作者： Eka Murdani Andi Suhandi Doctoral Program of Science Education Universitas Pendidikan Indonesia Bandung 40154 Indonesia Physics Education Program STKIP Singkawang Singkawang 79251 Indonesia Department of Science Education Post-Graduate School Universitas Pendidikan Indonesia Bandung Indonesia

This research was conducted to design a water purification technique for wellbore peat soil which has a high yellow rust (high iron content level). This research method is carried out by designing a layered or multilevel filter technique that is designed in such a way as to get the right composition in the filter layer arrangement. The borehole water sample studied had an iron content level of 5.0863 mg/L which did not find the requirements for clean water (at least 0.5 mg/L) and drinking water (at least 0.3 mg/L). The zeolite filter media was able to reduce the iron content level of the sample to 3.0362 mg/L. Activated charcoal filter media was able to reduce the iron content level of the sample to 1.4662 mg/L. The zeolite-activated charcoal filter media was effective in reducing the iron content level of the sample to 0.0326 mg/L. The last research has been carried out with the composition and arrangement of the filter layers in the container in order from top to bottom is zeolite, charcoal, beach shell sand. The filter is most effective in reducing the iron content level of the sample to 0.0106 mg/L. The results of the borehole water filtration using zeolite-activated charcoal filter media and zeolite-activated charcoal-coastal sand filter is categorized as clean water and drinking water. However, the filtered water must still be cooked for drinking water so that germs and bacteria die in boiling water.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Thermoelectric material based on ti doped CuCrO2 by sol-gel method

引用

AIP Conference Proceedings 2024年第1期3068卷

作者： Noni Surtiana Silalahi Syahrul Humaidi Agung Imaduddin Nono Darsono Doli Bonardo Post Graduate Program (Physics) FMIPA Universitas Sumatera Utara Jl. Bioteknologi I Kampus USU Medan 20155 Indonesia Research Center for Advanced Materials National Research and Innovation Agency (BRIN) Tangerang Selatan Banten 15314 Indonesia

A CuCrO2−based thermoelectric material with a delaffosite structure was prepared using the sol-gel technique with the addition of Ti dopant as a modifier agent. The sol-gel process which is considered effective for modifying the surface of substrates is applied in the process of preparing CuCrO2 thermoelectric material because this process allows modification of the crystal structure so that it can be observed its affect on its thermoelectric characteristics. Urea is used as a precipitating agent in the success of the sol-gel process, besides that urea is also a mesopore-directing agent for a modified sol-gel process. The calcination and sintering process after the palletization of CuCrO2 was carried out at a temperature of 1000 °C for 10 hours each to strengthen the crystallization process of the sample. X-Ray Diffraction (XRD) test showed a decrease in the crystallinity of the CuCrO2 phase structure and an increase in the number of impurities. However, the crystal structure of the CuCrO2 phase did not experience any changes or crucial defects, so the delaffosite structure could still be maintained when the addition of TiO2 reached 0.1 wt%. Based on the results of SEM (Scanning Electron Microscope) morphology observations, it was observed that the addition of Ti dopants had an impact on increasing the density between grains and changing the nanostructure of the grains from nanoplates to nanodots. Changes in the nanostructure of CuCrO2 cause an increase in its thermoelectric properties, this can be associated with an increase in the specific surface area that occurs as a result of the addition of Ti to the CuCrO2 phase.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Bioactivity, Efficacy, and Safety of a Wound Healing Ointment With Medicinal Plant Bioactives: In Vitro and In Vivo Preclinical Evaluations

Scientific World Journal

引用

Scientific World Journal 2025年第1期2025卷 9466270页

作者： Floriano, Juliana Ferreira Rodrigues, Daniel Ohara, Rie Almeida, Nara Lígia Martins Lara, Vanessa Soares Sartorelli, Patricia Graeff, Carlos Frederico de Oliveira Grecco, Simone dos Santos González, Alejandra Hortencia Miranda D’Alpino, Paulo Henrique Perlatti Imperial College London National Heart and Lung Institute imperial.ac.uk GBR London United Kingdom Botucatu Medical School São Paulo State University (UNESP) São Paulo unesp.br BRA Botucatu Brazil Bioengineering and Biomaterials Group School of Pharmaceutical Sciences São Paulo State University (UNESP) unesp.br BRA Araraquara São Paulo Brazil Biotechnology and Innovation in Health Program Universidade Anhanguera de São Paulo (UNIAN) São Paulo BRA Brazil Brazil Department of Health Management Fundação Nacional de Gestão de Saúde São Paulo Brazil Undergraduate Program Medical School Universidade Nove de Julho Bauru São Paulo Brazil Department of Surgery Stomatology Pathology and Radiology Bauru School of Dentistry University of São Paulo (USP) São Paulo usp.br BRA Bauru Brazil Department of Chemistry Institute of Environmental Chemical and Pharmaceutical Sciences Federal University of São Paulo São Paulo unifesp.br BRA Diadema Brazil Department of Physics School of Sciences POSMAT-Post-Graduate Program in Materials Science and Technology São Paulo State University (UNESP) São Paulo Bauru Brazil Department of Research and Development (RD) and Innovation Center Triplet Biotechnology Solutions Inc Bauru São Paulo Brazil Post-Graduate Program in Dentistry Uniderp Anhanguera University Mato Grosso do Sul Campo Grande Brazil Post-Graduate Program in Integrated Dental Sciences University of Cuiabá (UNIC) Mato Grosso do Sul Cuiabá Brazil Department of Physics School of Sciences São Paulo State University (UNESP) São Paulo unesp.br BRA Bauru Brazil

Chronic wounds have a significant impact on patients’ quality of life, necessitating the management of pain, infection, bleeding, and emotional challenges. Debridement, which involves the removal of nonviable tissue, is crucial for promoting wound healing. In addition to surgical methods, cost-effective alternatives such as local solutions and ointments with biological properties have been explored. The use of natural compounds with anti-inflammatory, antibacterial, and collagen-synthesizing abilities holds promise for wound healing. This in vitro and in vivo preclinical study aimed to assess the safety and effectiveness of a wound healing ointment containing bioactive ingredients derived from medicinal plants (extracts, essential oils, and vegetable oils). The chemical composition of the ointment was characterized using Fourier transform infrared (FTIR) spectroscopy to gain insights into its synergistic action. Preclinical tests were conducted following standardized protocols. FTIR analysis revealed similarities between the product’s spectrum and that of bioactive compounds. The in vitro tests demonstrated that all formulations of the ointment induced no cell death, DNA damage, or acute toxicity in cell cultures (p < 0.05). No lethal dose was observed, indicating the safety of the ointment at all concentrations. The ointment also stimulated a notably more organized, significantly higher collagen production compared to control groups (p < 0.05). In vivo preclinical analyses also demonstrated no adverse responses being effective in the healing process compared to the control group (silver sulfadiazine) in terms of wound contraction and ulcer re-epithelization (p < 0.05). Significantly higher means of wound contraction were observed in the groups treated with the bioactive-containing ointment when compared to both the positive control group (sulfadiazine) and the control untreated groups (p < 0.05). The regenerative ointment exhibited excellent biocompatibility and bi

关键词： biocompatibility chronic wounds natural compounds preclinical tests wound care

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：