Conecte-se

Bibliografias temáticas / Strcutures / Artigos de revistas

Artigos de revistas sobre o tema "Strcutures"

Siga este link para ver outros tipos de publicações sobre o tema: Strcutures.

Autor: Grafiati

Publicado: 26 de julho de 2024

Última modificação: 27 de julho de 2024

Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos

Selecione um tipo de fonte:

Veja os 46 melhores artigos de revistas para estudos sobre o assunto "Strcutures".

Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.

Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.

Veja os artigos de revistas das mais diversas áreas científicas e compile uma bibliografia correta.

1

He, Boling, Yuwei Lu e Yupeng Liu. "Flexural behavior of CFRP-aluminum fuselage frames with bolted splice joints". Journal of Physics: Conference Series 2342, n.º 1 (1 de setembro de 2022): 012002. http://dx.doi.org/10.1088/1742-6596/2342/1/012002.

Texto completo da fonte

Resumo:

Abstract Few work concerned on the flexural strength of carbon fiber reinforced plastic (CFRP)-aluminum fuselage frames with bolted splice joints used in aeronautical industry. To provide help for the design of CFRP aircraft strcutures, this paper investigated the flexural behavior of CFRP-aluminum fuselage frames with bolted splice joints experimentally. Firstly, CFRP-aluminum fuselage frames were fabricated with mid-span bolted splice joints. The joints comprised: reinforced or unreinforced aluminum splice plates bolted to the fuselage frames. The bolt diameters were 4.76mm and 6.35mm. Then, the effects of splice plate and bolt dimeter on flexural behavior of CFRP-aluminum fuselage frames with bolted splice joints were investigated through four-point bending test. It has been shown that the introduction of reinforced splice plate improves the structural load capacity. However, increasing bolt diameter lowers the flexural strength of CFRP-aluminum fuselage frames with bolted splice joints. This splice jointed structure is a representative part of the rear fuselage, and the experimental results will be commonly instructive for the the aeronautical CFRP joining applications.

Estilos ABNT, Harvard, Vancouver, APA, etc.

2

Liu, De Zheng, Qiang Xu, Zhong Yu Lu, Dong Lai Xu e Feng Tan. "The Validation of Computational FE Software for Creep Damage Mechanics". Advanced Materials Research 744 (agosto de 2013): 205–10. http://dx.doi.org/10.4028/www.scientific.net/amr.744.205.

Texto completo da fonte

Resumo:

The preliminary validation of in-house finite element analysis software for creep damage mechanics is reported. The Finite Element Analysis Method and the programme strcuture for creep damage problem were reported elsewhere and the validation conducted so far include plane stress, plane strain, and axisymmetric cases. Furture work is also outlined.

Estilos ABNT, Harvard, Vancouver, APA, etc.

3

木再, 帕尔. "The Place of Head Words in Several Phrase Strcuture". Modern Linguistics 08, n.º 04 (2020): 517–25. http://dx.doi.org/10.12677/ml.2020.84071.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

4

Shopina, I., e V. Volovyk. "DEFINITION, FEATURES AND STRCUTURE OF THE LEGAL CULTURE OF SERVICEMEN". Visnyk Taras Shevchenko National University of Kyiv. Military-Special Sciences, n.º 2 (44) (2020): 47–49. http://dx.doi.org/10.17721/1728-2217.2020.44.47-49.

Texto completo da fonte

Resumo:

The article is dedicated to determining the definition, features and structure of the legal culture of servicemen.The definition of the legal culture of a serviceman is presented as a complex of judicial values, abilities and skills whichaltogether determine his legal behavior.There’re arguments provided in favor of the idea that the culture of servicemen happens to have the following features: a) avariety of the general culture of the serviceman which happens to develop in the course nurturing within the family and the initialsocialization in the system of common middle-professional education; b) is characterized by a number of layers and consists ofthe legal culture of the citizen, which includes the legal culture of a serviceman and which in its turn consists of the legal cultureof a cadet, officers, sergeants and non-commissioned officers and privates etc; c) has influence on both the behavior of theserviceman, but also the existing overall level of legal culture of military entities.Based on the analyses of the elements of the legal culture of the serviceman it was possible to determine the followingelements of its structure: а) the theoretic-legal culture (doctrinal knowledge with regard to the essence and the peculiarities oflaw, the legal norm, state, rights and freedoms of the individual and other legal phenomena, that indirectly influence the socialrelations in a state and determine the content of the generic and special legislation); b) the military-legal culture (knowledge inthe field of military law, abilities and skills in terms of his implementation in different situations in the line of duty); c) theinformational-legal culture (the complex of knowledge, abilities and skills of legally just behavior in informational relations). Itincludes a pretty broad spectrum of elements – starting with the behavior of the servicemen on the social media and finishes withthe protection of personal data of one’s subordinates; d) the linguistic-legal culture ( the complex of knowledge, ability and skills,which allow to freely operate with the foreign military terminology, including the one that is implemented in administrative,operative, and NATO material-technical standards; e) the pedagogical-legal culture (the complex of special methods and meansto develop knowledge, abilities and skills, value orienteers and persuasions based on the realization of the rule of law among thesubordinates and other servicemen).

Estilos ABNT, Harvard, Vancouver, APA, etc.

5

Oetomo, Repelita Wahyu, e Heddy Surachman. "Sisa Struktur Bangunan di Samudera Pasai (Tinjauan Konstruksi dan Fungsinya)". Berkala Arkeologi Sangkhakala 15, n.º 1 (5 de janeiro de 2018): 142. http://dx.doi.org/10.24832/bas.v15i1.141.

Texto completo da fonte

Resumo:

AbstractAs a centre of administration, Samudera Pasai must have archaeological remains ofbuildings. The fact, however, shows very few data except tombs. Recently,information of a strcuture remain has come into existence. It is predicted to be asurrounding wall of a bulding inside.AbstrakSebagai sebuah pusat pemerintahan, Samudera Pasai seharusnya memiliki tinggalanarkeologis berupa bangunan. Namun sampai sejauh ini belum banyak data bangunanditemukan di Pasai, selain makam. Belakangan didapatkan informasi adanya strukturbangunan. Diperkirakan struktur bangunan tersebut adalah merupakan tembokkeliling dari sebuah bangunan di dalamnya

Estilos ABNT, Harvard, Vancouver, APA, etc.

6

Amiruddin, Amiruddin, Candra Kurniawan, Eka Hero Ramadhani e Julio Rinaldi. "Learning the Basic Strcuture of Several Ransomwares Using Static Analysis Tecgnique". IOP Conference Series: Materials Science and Engineering 1007 (31 de dezembro de 2020): 012072. http://dx.doi.org/10.1088/1757-899x/1007/1/012072.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

7

HUANG, DAMING, MICHAEL A. RESHCHIKOV e HADIS MORKOÇ. "GROWTH, STRUCTURES, AND OPTICAL PROPERTIES OF III-NITRIDE QUANTUM DOTS". International Journal of High Speed Electronics and Systems 12, n.º 01 (março de 2002): 79–110. http://dx.doi.org/10.1142/s0129156402001137.

Texto completo da fonte

Resumo:

This article reviews the advances in the growth of III-nitride quantum dots achieved in the last few years and their unique properties. The growth techniques and the strcutural and optical properties associated with quantum confinement, strain, and polarization in GaN/Al x Ga 1-x N and In x Ga 1-x N/GaN quantum dots are discussed in detail.

Estilos ABNT, Harvard, Vancouver, APA, etc.

8

Murch, Graeme E., Irina V. Belova e H. Zhang. "Collective Correlation Factors in the Ising Ordered Alloy with the B2 Strcuture". Defect and Diffusion Forum 136-137 (março de 1996): 1–20. http://dx.doi.org/10.4028/www.scientific.net/ddf.136-137.1.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

9

Zhao, Li Ping, Wen Hong Tao, Xing Hua Fu, Wen Zhe Cao, Guo Yuan Cheng e Wen Xin Ma. "The Influence of Mn Doping on the Dielectric Properties of Ba_0.5Sr_0.5TiO₃ Ceramics". Materials Science Forum 859 (maio de 2016): 18–23. http://dx.doi.org/10.4028/www.scientific.net/msf.859.18.

Texto completo da fonte

Resumo:

(Ba0.5Sr0.5)1-xMnxTiO3(x=0,0.01,0.03,0.05)ceramics were prepared via a new sol-gel method with titannium oxide, strontium nitrate, barium nitrate and manganous nitrate as raw materials.The effect of Mn doping on the microstructure and dielectric properties of the BST were characterized by field scanning electron microscopy,x-ray diffraction and impedance analyser.It was found that the dopted ions could not alter the basic crystal strcuture and they only improved the material properties as modified ions when x≤0.3.The (Ba0.5Sr0.5)1-xMnxTiO3 ceramics sintered at 1250°C for 2h exhibited good dielectric properties(er=1330,tand=0.03)at room temperature and f=1KHz when x=0.03 and the grains were regular and uniform ,indicating a dense microstrcture.

Estilos ABNT, Harvard, Vancouver, APA, etc.

10

Carol, Seika, e Jonnardi Jonnardi. "FAKTOR YANG MEMPENGARUHI STRUKTUR MODAL PADA PERUSAHAAN MANUFAKTUR YANG TERDAFTAR DI BEI". Jurnal Paradigma Akuntansi 5, n.º 3 (15 de julho de 2023): 1419–26. http://dx.doi.org/10.24912/jpa.v5i3.25256.

Texto completo da fonte

Resumo:

The purpose of this research is to examine the influence of profitability, firm size and liquidity to capital structure on manufacture company that registered on Indonesia Stock Exchange in period of 2016-2020. Then based on simple random sampling that used in this research This research is conducted by using 49 company industry that registered on Indonesia Stock Exchange as sample have been discovered. The data source of the research is the secondary data obtained not direct. Data analysis was performed with descriptive statistics. The results of this research shows that profitability had a positive and significant effect to capital structure companies, firm size had no siginifcant to capital structure, and liquidity had a negative and significant effect to capital strcuture companies.

Estilos ABNT, Harvard, Vancouver, APA, etc.

11

Li, Zhen Zhuang, Zong Bin Li, Yi Qiao Yang, Bo Yang, Xiang Zhao e Liang Zuo. "Compositional Dependent Crystal Structure in NiMnGa Matensite". Key Engineering Materials 727 (janeiro de 2017): 244–48. http://dx.doi.org/10.4028/www.scientific.net/kem.727.244.

Texto completo da fonte

Resumo:

The effect of composition on martensitic phase transformation and structure in polycrystalline NiMnGa was investigated through Ni substitution for Mn, Ga and Mn substitution for Ga. The martensitic transformation temperatures almost linerly increase with increasing Ni content in Ni50+xMn50-xGa25, Ni50+yMn25Ga25-y and Mn content in Ni50Mn25+zGa25-z. The increases in rate of the martensitic transformation temperatures are different for the three conditions. It is large for Ga substituted by Ni, slow for both Mn substituted by Ni and Ga substituted by Mn. Analysis shows that electronic concentration is an important factor to influence the martensitic transformation temperature in the Ni-Mn-Ga alloys. The results show that Ni excess stabilizes the NM martensitic structure and Mn excess stabilizes the 7M martensitic strcuture in broad composition range.

Estilos ABNT, Harvard, Vancouver, APA, etc.

12

Bagaskoro, Mayong Noor. "PENGARUH EKSPOR IMPOR TERHADAP TRANSAKSI BERJALAN INDONESIA SEBELUM DAN SESUDAH SUBPRIME MORTGAGE". ECOPLAN : JOURNAL OF ECONOMICS AND DEVELOPMENT STUDIES 2, n.º 1 (30 de abril de 2019): 21–32. http://dx.doi.org/10.20527/ecoplan.v2i1.15.

Texto completo da fonte

Resumo:

This study is to determine the effect of exports and imports on the current account of Indonesia and comparison before and after the 2008’s subprime mortgage crisis. The analytical method used is mutiple regression and strcutural break test. The regression results show that exports have positive effect and imports have negative effect on current account of Indonesia. While the structural break test show that there are differences in the comparison effect of export and import on the current account of Indonesia in the before and after the crisis.

Estilos ABNT, Harvard, Vancouver, APA, etc.

13

KIDO, Hiroyuki, e Shuwei HUANG. "Diagramatic Representation of Models for the Burning Velocity and Strcuture of Premixed Tubulent Flames." Transactions of the Japan Society of Mechanical Engineers Series B 58, n.º 548 (1992): 1329–36. http://dx.doi.org/10.1299/kikaib.58.1329.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

14

Nunung Widyaningsih, Jalaludin. "Penentu Perilaku Keselamatan Pengendara Sepeda Motor dengan Pendekatan Strcutural Equation Modeling". Jurnal Penelitian Transportasi Darat 24, n.º 1 (27 de junho de 2022): 11–20. http://dx.doi.org/10.25104/jptd.v24i1.2096.

Texto completo da fonte

Resumo:

Ada berbagai faktor yang menjadi penyebab kecelakaan lalu lintas di Jalan dan salah faktor terbesarnya adalah akibat manusia yang berhubungan dengan perilaku pengendara. Di Indonesia kasus kecelakaan lalu lintas di Jalan didominasi oleh pengendara sepeda motor. Terlebih lagi Jakarta yang menjadi salah satu kota di Indonesia dengan tingkat kecelakaan sepeda motor cukup tinggi. Studi ini mengeksplorasi faktor – faktor yang menjadi penentu perilaku keselamatan pengendara sepeda motor di Jakarta dengan mengintegrasikan teori TAM (Technology Acceptance Model) dan TPB (Theory of Planned Behaviour). Pendekatan yang digunakan pada penelitian ini adalah kuantitatif dengan pengumpulan data menggunakan kuesioner tertutup yang disebarkan pada 230 responden pengendara sepeda motor di jalanan Jakarta. Structural Equation Modeling atau SEM pada penelitian ini digunakan sebagai teknik analisis data dengan program AMOS 22.00 untuk menentukan faktor penentu perilaku keselamatan. Hasil temuan menunjukkan intensi perilaku selamat menjadi prediktor paling berpengaruh secara langsung terhadap perilaku keselamatan. Sedangkan prediktor yang menjadi penentu paling dominan secara tidak langsung terhadap perilaku keselamatan adalah sikap pengendara. Temuan lain menjelaskan bahwa usia pengendara berpengaruh secara signifikan terhadap perilaku keselamatan. Kata Kunci: Structural equation modeling(SEM); technology acceptance model/TAM; theory of planned behavior/TPB.

Estilos ABNT, Harvard, Vancouver, APA, etc.

15

BAGASKORO, MAYONG NOOR, e MUHAMMAD HANDRY IMANSYAH. "PENGARUH EKSPOR IMPOR TERHADAP TRANSAKSI BERJALAN INDONESIA SEBELUM DAN SESUDAH SUBPRIME MORTGAGE". JIEP: Jurnal Ilmu Ekonomi dan Pembangunan 2, n.º 2 (25 de setembro de 2019): 332. http://dx.doi.org/10.20527/jiep.v2i2.1176.

Texto completo da fonte

Resumo:

This study is to determine the effect of exports and imports on the current account of Indonesia and comparison before and after the 2008’s subprime mortgage crisis. The analytical method used is mutiple regression and strcutural break test. The regression results show that exports have positive effect and imports have negative effect on current account of Indonesia. While the structural break test show that there are differences in the comparison effect of export and import on the current account of Indonesia in the before and after the crisis.Keyword : export, import, currrent account balance, subprime mortgage crisis

Estilos ABNT, Harvard, Vancouver, APA, etc.

16

Fu-Tian, Han, Chen Ji-Zhou, Wang Jun-Qiao, Wu Xuan-Chi e Bin Ren-Mao. "Strcuture of Oriented Non-crystalline PET Studied with Two-dimensional WAXS Intensity by Symmetrical Transmission". Acta Physico-Chimica Sinica 12, n.º 01 (1996): 39–43. http://dx.doi.org/10.3866/pku.whxb19960109.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

17

Gu, Jun Ming, Zhan Qiao Li e Ling Ling Meng. "Reseach on Material of Steel Grid Strcuture with Assemble of Grid Frame of Museology Museum". Advanced Materials Research 977 (junho de 2014): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amr.977.3.

Texto completo da fonte

Resumo:

According to the grid frame for the project of museology museum of in Gu’an, it was presented that the assembling technique, quality control and feature, etc, by which a smooth assemble of the grid frame was ensured.

Estilos ABNT, Harvard, Vancouver, APA, etc.

18

Chen, C. C., e Y. R. Chen. "Comparison of hydathodes and stomata in Ficus formosana maxim". Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 342–43. http://dx.doi.org/10.1017/s0424820100169444.

Texto completo da fonte

Resumo:

Two major ways of water discharge from plant leaves are vapour transpiration and liquid guttation through stomata and hydathodes, resptectively. However, besides pure water, guttation fluid contains various salts, sugars and other organic substances which cause injury to plants through their accumulation on leaf surface. Functionally, hydathodes not only play an important role on water excretion but also on retrieval of minerals and their structures are different from those of stomata, even though both have same phylogenic origin. In the present study, the distribution, strcuture, and cytology of hydathodes and stomata of Fisuc formosana Maxim were reported.Leaf blades of fully expanded leaf were cut with a razor blade into small cubes in fixation buffer containing 2.5% glutaraldehyde. These were transfered to fresh fixation buffer for 2 h, postfixed in 1% osmium tetraoxide for 4 h, dehydrated through an ethanol series, and then infiltrated and embedded in Spurr's resin. Sections in golden color were collected on grids, doubly stained with uranyl acetate and lead citrate, and observed with a Hitachi H-600 transmission electron microscope (TEM).

Estilos ABNT, Harvard, Vancouver, APA, etc.

19

ONODA, Motonobu, Takeshi TSUCHIYA, Kazuo SHIMIZU e Tohru WATANABE. "Effect of Heat Treatment on Crystal Strcuture and Physical Properties of Electroplated Amorphous Ni-B Alloy Film." Journal of the Surface Finishing Society of Japan 43, n.º 2 (1992): 138–43. http://dx.doi.org/10.4139/sfj.43.138.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

20

Li, J. H., D. Z. Shen, J. Y. Zhang, D. X. Zhao, B. S. Li, Y. M. Lu, Y. C. Liu e X. W. Fan. "The effect of Mn2+ doping on strcuture and photoluminescence of ZnO nanofilms synthesized by sol–gel method". Journal of Luminescence 122-123 (janeiro de 2007): 352–54. http://dx.doi.org/10.1016/j.jlumin.2006.01.182.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

21

LI, Sanzhong, Yanhui SUO, Xin LIU, Liming DAI, Shan YU, Shujuan ZHAO, Yun MA et al. "BASIC STRCUTURAL PATTERN AND TECTONIC MODELS OF THE SOUTH CHINA SEA: PROBLEMS, ADVANCES AND CONTROVERSIES". Marine Geology & Quaternary Geology 32, n.º 6 (17 de fevereiro de 2013): 35–53. http://dx.doi.org/10.3724/sp.j.1140.2012.06035.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

22

Li, Desheng, Junhong Zhang, Dehua Li e Fengrong Bi. "Transverse vibration analysis of concentrated mass-loaded thin circular plate based on strcutural circumferential periodicity". Transactions of Tianjin University 21, n.º 2 (abril de 2015): 147–52. http://dx.doi.org/10.1007/s12209-015-2289-z.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

23

López, Concepción, Joaquim Sales, Xavier Solans e Raschid Zquiak. "Cyclopalladated compounds derived from ferrocenylimines. Crystal strcuture of [Pd{(η5-C5H5)Fe[η5-C5H3CHN(CH2)2Ph]}Cl(PEt3)]". J. Chem. Soc., Dalton Trans., n.º 15 (1992): 2321–28. http://dx.doi.org/10.1039/dt9920002321.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

24

Unayah, Enah. "PENGARUH PENGAWASAN INTERNAL, KEMAMPUAN TEKNIK PERSONAL, PROGRAM PENDIDIKAN DAN PELATIHAN TERHADAP KINERJA SISTEM INFORMASI AKUNTANSI (Studi Kasus Pada kantor Kementerian Agama Kab/Kota di Propinsi Banten)". Jurnal Riset Akuntansi Tirtayasa 5, n.º 1 (10 de abril de 2020): 57–72. http://dx.doi.org/10.48181/jratirtayasa.v5i1.8341.

Texto completo da fonte

Resumo:

This study aims to examine the influence of internal control, personal technical skills, education programs and training on the performance of accounting information systems. The population in this study is the sub-section of administration in the Office of the Ministry of Religious Affairs in the Regency / City in Banten province with the research sample is the Head of Sub division of administration and application operator employees. The sampling method used is purposive sampling. The data in this study was obtained by distributing questionnaires directly to the respondents. Data in this research is analyzed by strcutural equation modeling (SEM) method, with Partial Least Square (PLS) approach. The results of this study indicate that internal control has a significant positive effect on the performance of accounting information systems, the ability of personal techniques has no significant effect on the performance of accounting information systems. While education and training programs have a significant positive effect on the performance of accounting information system.

Estilos ABNT, Harvard, Vancouver, APA, etc.

25

Moretti, D. V., D. Paternicò, A. Prestia, G. Binetti, O. Zanetti e G. B. Frisoni. "Theta Frequency is Associated to Morpho-Strcutural and Perfusional Modifications in Subjects with Mild Cognitive Impairment". Journal of Psychology and Psychotherapy Research 1, n.º 1 (5 de fevereiro de 2014): 3–13. http://dx.doi.org/10.12974/2313-1047.2014.01.01.1.

Texto completo da fonte

Resumo:

Background: In an attempt to find non-invasive biomarkers, researchers have investigated the feasibility of neuroimaging tools, such as MR, SPECT as well as neurophysiological measurements using EEG. The increase of theta frequency has been associated with mild cognitive impairment (MCI) and related to both grey matter (GM) changes of thalamus and basal ganglia and SPECT modifications. Objective: To study the association of prognostic theta frequency with specific GM and perfusional changes of thalamus and basal ganglia to detect biomarkers early predictive of mild cognitive impairment. Methods: 74 adult subjects with mild cognitive impairment underwent EEG recording and high resolution 3D magnetic resonance imaging (MRI). Moreover, 27 adult subjects with mild cognitive impairment underwent also perfusion single-photon emission computed tomography (SPECT) evaluation. The theta/gamma ratio was computed for each subject. Three groups were obtained according to increasing tertiles values of theta/gamma ratio. Grey matter density differences between groups were investigated using a Voxel Based Morphometry technique. Results: Subjects with higher theta/gamma ratio and increase of theta frequency showed minor atrophy in putamina nuclei bilaterally and a lower hippocampal perfusion in subjects with mild cognitive impairment. Conclusion: The integrated analysis of EEG and morpho-functional markers could be useful in the comprehension of anatomo-physiological underpinning of the MCI entity.

Estilos ABNT, Harvard, Vancouver, APA, etc.

26

SHIMADA, Takahiro, Satoru OKAWA e Takayuki KITAMURA. "T0301-2-5 Development of Evaluation Method for Mechanical Instability Using Linear Elements and Its Application to Cracked Atomic Strcuture". Proceedings of the JSME annual meeting 2009.8 (2009): 53–54. http://dx.doi.org/10.1299/jsmemecjo.2009.8.0_53.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

27

Tuti, Nani Radias, Dwi Ningsih Susilawati e Nur Hasni. "ENDOPHYTIC FUNGI COMMUNITIES FROM Centella asiatica OF BENGKULU ACCESSION". Fungal Territory 2, n.º 3 (3 de setembro de 2019): 22–27. http://dx.doi.org/10.36547/ft.2019.2.3.22-27.

Texto completo da fonte

Resumo:

Various species of endophytic fungi have been isolated and reported from various types of plants and tissues, but how host or plant tissue determines endophytic community structure has not been explored quantitatively. The aim of this research was to understand community structure of endophytic fungi in various organs of Centella asiatica of Bengkulu accession. The analysis data use to Shannon Wienner diversity index (H’), dominance index, colonization rate, frequency of occurrence and UPGMA analysis with Jaccard Coefficient. Total 61 isolates were obtained and grouped into 19 morfotypes, consist of 15 Asomycetes & 4 Basidiomycetes and 10 Genera. The highest colonization rate was in stolons (16%) and the lowest is in petiols (4%). Endophytic fungi were distributed in all of the organs. Leaves harbored more diverse endophytic fungi (H’= 2,138) than the other organs and classified as medium. Fusarium solani, Fusarium oxysporum dan Phoma multirostrata were the dominant species.This research showed that different type of host-pant organs influenced community structure of endophytic fungi from C. asiatica of Bengkulu accession. This is the first report, on the community strcuture of endophytic fungi from C. asiatica from leaves, petiols, stolons, and roots part of the organ plant. Overall, our results indicated that the isolate can be used to analyzed of it’s potential as bioactive compuond same as the host.

Estilos ABNT, Harvard, Vancouver, APA, etc.

28

Moritomo, Yutaka, Kenichi Kato, Akira Kuriki, Akio Nakamoto, Norimichi Kojima, Masaki Takata e Makoto Sakata. "Strcutural Analysis of [Fe(ptz)6)](BF4)2under Photo-Excitation –Condensation of Photo-Excited High-Spin Ions–". Journal of the Physical Society of Japan 71, n.º 11 (15 de novembro de 2002): 2609–12. http://dx.doi.org/10.1143/jpsj.71.2609.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

29

Sánchez, José Miguel, e Alfredo Trespalacios Carrasquilla. "Sobre la volatilidad de la curva de rendimientos del mercado colombiano de deuda pública". Ecos de Economía 22, n.º 46 (18 de junho de 2018): 28–59. http://dx.doi.org/10.17230/ecos.2018.46.2.

Texto completo da fonte

Resumo:

En este trabajo se estima la volatilidad de la estructura temporal de las tasas de interés (ETTI) del mercado colombiano de deuda pública y se explica su relación con los fundamentales macroeconómicos. A partir del modelo paramétrico propuesto por Nelson y Siegel (1987), se estima la ETTI con el fin de capturar el componente de volatilidad condicional, con modelos de heterocedasticidad condicional autorregresiva (ARCH, por sus siglas en inglés Autoregressive Conditional Heteroskedasticity). A continuación, se evalúa su relación con variables macroeconómicas como el producto interno bruto ( ), el nivel general de precios ( ), la tasa de interés de política monetaria ( ) y el riesgo país ( , a través de las funciones impulso-respuesta de los modelos de vectores autorregresivos estructurales (SVAR, por sus siglas en inglés Strcutural Vector Autoregressive) y de las pruebas de causalidad de Granger. Los resultados muestran que la volatilidad de la ETTI del mercado colombiano de deuda pública tiene efectos asimétricos y que hay relaciones causales en ambos sentidos con algunas de las variables macroeconómicas; sin embargo, cuando se presentan choques entre ellas, solo existen respuestas significativas unidireccionales desde la macroeconomía hacia la volatilidad de la ETTI, y no en el sentido contrario.

Estilos ABNT, Harvard, Vancouver, APA, etc.

30

محمد حسن آل هيد, بدر. "التقنيات الفنية (الخدع البصرية) في المسرح وعلاقتها بالبناء الدرامي للنصوص المسرحية Visual Effects (VFX) and their correlation with the Theatrical Scripts' Dramatic Strcuture". المجلة العلمية لعلوم التربية النوعية 19, n.º 19 (1 de junho de 2024): 539–71. http://dx.doi.org/10.21608/sjsep.2024.280562.1057.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

31

Morovat, Mohammed Ali, Jin Woo Lee, Michael D. Engelhardt, Eric M. Taleff, Todd A. Helwig e Victoria A. Segrest. "Creep Properties of ASTM A992 Steel at Elevated Temperatures". Advanced Materials Research 446-449 (janeiro de 2012): 786–92. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.786.

Texto completo da fonte

Resumo:

In moving towards an engineered performance-based approach to structural fire safety, a sound knowledge of the elevated-temperature properties of structural steel is crucial. Of all mechanical properties of structural steel at elevated temperatures, material creep is particularly important. Under fire conditions, behavior of steel members and structures can be highly time-dependent. As a result, understanding the time-dependent mechanical properties of structural steel at high temperatures becomes essential. This paper presents preliminary results of a comprehensive on-going research project aimed at characterizing the material creep behavior of ASTM A992 steel at elevated temperatures. Such creep properties are presented in the form of strain-time curves for materials from the web and the flanges of a W4×13 wide flange section and from the web of a W30×99 section. The test results are then compared against material creep models for structural steel developed by Harmathy, and by Fields and Fields to evaluate the predictions of these models. The preliminary results clearly indicate that material creep is significant within the time, temperature, and stress regimes expected in a builing fire. The results also demonstrate the need for a more reliable creep model for steel for strcutural-fire engineering analysis.

Estilos ABNT, Harvard, Vancouver, APA, etc.

32

Jamil, Usama, Sehrish Mumtaz, Iqra Akram, Iqra Majeed, Muhammad Muzammil Mukhtiar, Tayyab Mumtaz Khan, Sana Mansoor, Madeeha Mumtaz e Shahrukh Khan. "Risk Factors of Osteoporosis in a Tertiary Care Hospital of Rawalpindi". European Journal of Health Sciences 7, n.º 4 (3 de outubro de 2022): 48–53. http://dx.doi.org/10.47672/ejhs.1213.

Texto completo da fonte

Resumo:

Purpose: Osteoporosis is a common health problem all over the world. Loss of bone mass with aging leads to osteoporosis. Different factors affect the bone mass loss and consequencltly osteoporosis prevalence. However, these factors are under-studied in the Pakistan.This study aims to identify the risk factors of osteoporosis among patients in Holy Family Hospital Rawalipindi. Methodology: This descriptive cross-sectional study was carried out in among 120 diagnosed patients of osteoporosis for six months from April 2021 to September 2021 in a tertiary care hospital of Rawalpindi. Patients were recruited in the study via a set of inclusion and exclusion criteria and non-probability convenient sampling technique. A self-strcutured questionnaire was used to collect data. Before data collection information consent was acquired from all participants. Data analysis was performed on SPSS version 25. Descriptive statistics were applied. Findings: Osteoporosis was more prevalent among the patients who had, age group with more than 45years (79.16%), female gender (72.50%), low education level (64.16%), lower socioeconomic status (68.33%), family history of osteoporosis (61.67%), sedentary lifestyle (57.50%), history of corticosteroids therapy (53.33%), no milk use (69.20%), no fresh vegetables and fruits use (80.00%), no inatke of calcium supplements (78.33%), no sunshine exposure (77.50%), and overweight (48.33%). In short, age group with age above 45years, female gender, low education level, lower socioeconomic status, family history of osteoporosis, sedentary lifestyle, overweight, history of use of corticosteroids, no milk use, no intake of fresh vegetables and fruits, no intake of calcium supplements, and no sunshine exposure, all raise the incidence of osteoporosis. Recommendations: People should take milk, fresh fruits and vegetables, calcium supplements, and sun bath. Furthermore, people should spend active life with proper weight.

Estilos ABNT, Harvard, Vancouver, APA, etc.

33

Chernus, N., S. .Sivkov, A. Serdakova, A. Sivkov e T. Savina. "Structure of personal disorders in hypertensive disease patients". European Psychiatry 64, S1 (abril de 2021): S252—S253. http://dx.doi.org/10.1192/j.eurpsy.2021.677.

Texto completo da fonte

Resumo:

IntroductionThe strcuture of personal disorders in hypertensive disease aptients remains relevant topic.ObjectivesThe study population included 57 hypertensive disease patients; mean age 49,1+9,6 years old (42 females and 15 males). The control group included 62 healthy individuals (49 females and 13 males); mean age 48,1+8,6 years old.MethodsEmotional condition of subjects was assessed using the Depression Scale of Zung, the Spielberger trait Anger scale and Anxiety, the Toronto Alexithymia Scale and SCL – 90-R Questionnaire.ResultsThe study results showed that as compared to the healthy individuals, the hypertensive disease patients showed significantly higher scores of reactive anxiety (46,0+9,0 and 39,0+8,2; р<0,01), personal anxiety (50,3+9,2 and 41,03+7,9; р<0,01), depression (42,7+7,2 and 36,59+5,95;р<0,01), alexithymia (69,4+8,8 and 59,0+9,2; р<0,01), state anger (11,8+3,6 and 10,6+1,8; р<0,01), reactive anger (9,2+2,6 and 8,1+2,4; р<0,05), personal anger (21,4+5,3 and 18,1+4,6; р<0,01), trait anger (8,3+3,0 and 7,3+2,3; р<0,05), self-aggression (16,2+4,9 and 13,4+3,8; р<0,01), aggression towards others (15,9+3,9 and 14,7+3,4; р<0,05), somatization (1,27+0,6 and 0,5+0,4; р<0,01), hostility (1,2+0,7 and 0,5+0,4; р<0,01), obsessive-compulsive traits (1,2+0,7 и 0,6+0,4; р<0,01), psychoticism (0,7+0,6 and 0,27+0,30; р<0,01) and paranoid traits (1,22+0,6 and 0,5+0,4; р<0,01), phobic anxiety (0,6+0,5 and 0,2+0,2; р<0,01) and interpersonal sensitivity (1,2+0,7 and 0,7+0,5; р<0,01).ConclusionsClose interrelations between manifestations of anxiety and depression spectrum disorders and anger may be explained by internal conflict between aggressive impulses and the need for adaptive behavior in such individuals, resulting in consistent vicious vortex.

Estilos ABNT, Harvard, Vancouver, APA, etc.

34

Arifovic, Jasmina, e James Bullard. "INTRODUCTION TO THE SPECIAL ISSUE: NEW APPROACHES TO LEARNING IN MACROECONOMIC MODELS". Macroeconomic Dynamics 5, n.º 02 (abril de 2001): 143–47. http://dx.doi.org/10.1017/s1365100501019010.

Texto completo da fonte

Resumo:

The research questions addressed by the literature on learning in macroeconomics can be classified into four categories: First, there are issues related to the convergence and stability under learning in models with unique rational expectations equilibria. Authors here are concerned mainly with the learnability of a rational expectations equilibrium, as a measure of that equilibrium's plausibility as an observed outcome in an actual economy. Second, there are issues related to convergence and stability under learning in models with multiple rational expectations equilibria. In this case, learnability serves as an equilibrium selection device, helping economists decide which equilibria are the more likely to be actually observed among the many that exist under rational expectations. A third set of issues involves the examination of transitional dynamics that accompanies the equilibrium selection process. Following some type of unexpected strcutural change or change in policy regime, for instance, economies necessarily must follow temporary transitional paths to a rational expectations equilibrium associated with the new reality. Learning is sometimes used to help model such transitional dynamics. Finally, there are issues related to the examination of learning dynamics that are intrinsically different, even asymptotically, from the dynamics of the rational expectations versions of the models. In these cases, the learning dynamics do not converge to the rational expectations fixed points, and (unexploitable) expectational errors persist indefinitely. Some authors have tried to make use of this possibility in order to build explanations of otherwise puzzling macroeconomic phenomena based on constantly changing expectations.

Estilos ABNT, Harvard, Vancouver, APA, etc.

35

Sitepu, H., J. P. Wright, T. Hansen, Daniel Chateigner, Heinz Günter Brokmeier, Clemens Ritter e Takaomi Ohba. "Combined Synchrotron and Neutron Strcutural Refinement of R-Phase in Ti_50.75.Ni_47.75.Fe_1.50 Shape Memory Alloy". Materials Science Forum 495-497 (setembro de 2005): 255–60. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.255.

Texto completo da fonte

Resumo:

The crystal structure of R-phase in Ti50.75.Ni47.75.Fe1.50 shape memory alloy (SMA) has been studied at a temperature of (290 ± 7) K on cooling by combined synchrotron and neutron powder diffraction using Rietveld refinement with generalized spherical harmonic (GSH) description for preferred orientation (PO). The results showed that (i) no significant improvement in the crystallographic RWP-factor was found when the inversion center was removed from the 3 P model, suggesting that the space group was indeed 3 P and not lower symmetry 3 P neither m P31 and (ii) the refined atomic parameters were converging only when the 3 P space group was used in the refinement.

Estilos ABNT, Harvard, Vancouver, APA, etc.

36

Skrabe, Emerson Strack, Paulo Guilherme Carniel Wagner e Walter Nisa Castro Neto. "A percepção ambiental de professores do ensino fundamental sobre o tráfico e a proteção à fauna em três municípios do Rio Grande do Sul, Brasil". Ambiente & Educação 25, n.º 2 (31 de agosto de 2020): 694–724. http://dx.doi.org/10.14295/ambeduc.v25i2.8660.

Texto completo da fonte

Resumo:

O Projeto Liberdade e Saúde, pioneiro no Brasil, que utiliza a educação ambiental como ferramenta de combate ao tráfico de animais silvestres é desenvolvido pelo IBAMA (PI) e IBAMA (RS). Este trabalha na formação de professores e alunos do ensino fundamental sobre a problemática do tráfico, suas modalidades, consequências, a legislação brasileira e o risco das zoonoses associadas. Verificou-se o que os professores compreendem sobre o tema, através de um questionário semi-estruturado de percepção ambiental aplicado aos professores de Guaíba, Porto Alegre e São Sebastião do Caí (RS). Analisou-se por estatística descritiva não paramétrica, a fim de estimar a frequência, as relações entre as respostas dos professores das distintas cidades. Participaram 149 professores e, destes, 146 reconheceram que o tráfico de animais silvestres é danoso ao ambiente. As características locais apareceram em algumas questões, representando assim os contextos de onde estão inseridas de maior e menor proximidade com o ambiente natural e com menos ou mais sinais de antropização. The environmental perception about the wildlife traffic and wildlife protection in three cities in the Rio Grande do Sul, Brazil The Liberty and Health project, developed by IBAMA (PI) and IBAMA (RS), is one of pioneer projects that use environmental education to elementary teachers and students, to prevent the wildlife trafficking in Brazil. It trains teachers and students for elementary schools about this issue, its forms, consequences, Brazilian laws and the risk about the zoonoses in this practice. For verify the comprehension of this public about this theme, applied a semi-strcutured questionnaire of environmental perception in the Guaíba, Porto Alegre and São Sebastião do Caí cities. The data was analyzed with non-parametric descriptive statistical analysis to estimate the frequencies about answers and cities, considered significant ( < 0,05). The most important answer with 149 teachers was the recognition about the damages of the wildlife trafficking. The local difference was seen in some questions, demonstrate the contexts of the proximity with the urbanization. This work demonstrate the necessity of constant formation of the teachers and public agents about the wildlife trafficking. Keywords: Environmental perception. Animal trafficking. Biodiversity. Wildlife. Environmental education. Elementary school.

Estilos ABNT, Harvard, Vancouver, APA, etc.

37

Oladimeji, Kazeem Adebayo, Abdulrazaq Kayode Abdulkareem e Abdulrasaq Ajadi Ishola. "Talent Management, Organizational Culture and Employee Productivity: The Moderating Effect of Employee Involvement". Journal of Human Resource Management - HR Advances and Developments 2023, n.º 1 (9 de agosto de 2023): 43–56. http://dx.doi.org/10.46287/dpkf9953.

Texto completo da fonte

Resumo:

Aim - This study investigates the influence of talent management and organi-zational culture on employee productivity in the public sector, also it assessed the moderating effect of employee involvement in the relationship. Methodology- The study employed a quantitative approach in data collection and analysis. Data was collected through a structured questionnaire disributed among 158 purposively sampled permanent senior staff in University of Ilor-in, Nigeria. The analysis was conduucted using Partial Least Square Strcutural Equation Modelling. Findings- The findings indicate several significant relationships between tal-ent management, employee commitment, employee productivity, and em-ployee satisfaction. Limitations- First is the small sample size of only 158 respondents from the public service. This small sample size may not accurately represent the views and experiences of employees from other industries or sectors and may limit the generalizability of the findings. Second, the study was conducted with a specific population of public service employees which may not be applicable to other sectors or organizations. Third is that the study relied on self-reported data from a survey, which may be subject to bias. Participants may have provided responses that they believed were socially desirable, rather than accurate reflections of their true beliefs and experiences. Practical implications- Public sector organizations should focus on imple-menting effective talent management practices, fostering a positive organisa-tional culture, and involving employees in shaping the culture in order to improve employee commitment and satisfaction. Further, the findings high-light the importance of focusing on employee commitment and improving employee productivity. More so, the rate at whihc employees are involved in the organization has an impact on the relationship between the organizational culture and employees’ productivity. Originality/value- The study contributes to literature by exploring how talent managment influences employee productivity, while investiating the critical moderating role of employee involvment.

Estilos ABNT, Harvard, Vancouver, APA, etc.

38

Saboktakin, Abbasali. "3D TEXTILE PREFORMS AND COMPOSITES FOR AIRCRAFT STRCUTURES: A REVIEW". International Journal of Aviation, Aeronautics, and Aerospace, 2019. http://dx.doi.org/10.15394/ijaaa.2019.1299.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

39

Nafis, S., N. J. Ianno, Paul G. Snyder, John A. Woollam e Blame Johs. "In Situ Studies of Electron Cyclotron Resonance Plasma Etching of Semiconductors by Spectroscopic Ellipsometry". MRS Proceedings 279 (1992). http://dx.doi.org/10.1557/proc-279-819.

Texto completo da fonte

Resumo:

ABSTRACTIn situ ellipsometry at selected wavelengths in the spectral range 280 nm to 1000 nnn was performed during the rf bias assisted electron cyclotron resonance (ECR) etching of bulk silicon, GaAs, InP, and GaAs/AlGaAs/GaAs, and InGaAs/InP layered strcutures by a CCl2F2 based etch gas.While real time thickness changes for bulk materials cannot be determined ellipsometrically, some insight into the etch mechanism may be gained by observing the effect of the process on the surface dynamically, and after the etch process has been completed. Monitoring of the layered structures during etching can provide a real time measure of the amount of material remaining in the layer being etched, and provide tight process control.

Estilos ABNT, Harvard, Vancouver, APA, etc.

40

Li, Yangfan, Kenli Li, Wei Wei, Joey Tianyi Zhou e Cen Chen. "CoRec: An Efficient Internet Behavior based Recommendation Framework with Edge-cloud Collaboration on Deep Convolution Neural Networks". ACM Transactions on Sensor Networks, 28 de julho de 2022. http://dx.doi.org/10.1145/3526191.

Texto completo da fonte

Resumo:

Both accurate and fast mobile recommendation systems based on click behaviors analysis are crucial in e-business. Deep learning has achieved state-of-the-art accuracy and the traditional wisdom often hosts these computation-intensive models in powerful cloud centers. However, the cloud-only approaches put significant computational pressure on cloud servers and increases the latency in heavy-load scenarios. Moreover, existing work often adopts RNN strcutures to model behaviors which suffers from low processing speed for under-utilization of parallel devices such as GPUs. In this work, we propose an efficient internet behavior based recommendation framework with edge-cloud collaboration on deep CNNs (CoRec) to improve both the accuracy and speed for mobile recommendation. A novel convolutional interest network (CIN) improves the accuracy by modeling the long- and short-term interests and accelerates the prediction through parallel-friendly convolutions. To further improve the serving throughput and latency, a novel device-cloud collaboration strategy reduces workloads by pre-computing and caching ong-term interests in the cloud offline and real-time computation of short-term interests in devices. Extensive experiments on real-world datasets show that CoRec significantly outperforms the state-of-the-art methods in accuracy and has achieved at least an order of magnitude improvement in latency and throughput compared to cloud-only RNN-based approaches for long behaviors.

Estilos ABNT, Harvard, Vancouver, APA, etc.

41

"Re : Chemistry of irdium carbonyl cluster complexes. Synthesis, chemical characterization and X-ray crystal strcutures of [PPh4][Ir6(CO)15Cl]·C4H8O and [PPh4][Ir6(CO)14Cl]". Journal of Organometallic Chemistry 402, n.º 3 (janeiro de 1991): C64. http://dx.doi.org/10.1016/0022-328x(91)86262-o.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

42

Menacho-Odio, Rose Marie. "Local perceptions, attitudes, beliefs, and practices toward bird-window collisions in Monteverde, Costa Rica". UNED Research Journal 10, n.º 1 (28 de fevereiro de 2018). http://dx.doi.org/10.22458/urj.v10i1.2038.

Texto completo da fonte

Resumo:

Bird-window collisions are an important cause of bird mortality worldwide. Reducing collisions requires understanding of the costs and benefits perceived by stakeholders. I consulted two focus groups, conducted 18-semi-strcutured interviews and applied surveys to 58 residents of Monteverde, Costa Rica, to understand their perception of the problem. Many reported collisions in their houses but there is a lack of information about the magnitude of the situation. Black silhouettes are the most frequent method of prevention, even though they are mostly ineffective. The main factors for selecting methods include unblocked views, aesthetics, effectiveness, ease of installation and removal, and ease of maintenance. The preferred effective method was cords (Acopian Bird Savers), and painted dots was the least liked. I recommend education about effective methods for Monteverde and similar communities.

Estilos ABNT, Harvard, Vancouver, APA, etc.

43

Reyes, Juan Antonio Gregorio Martínez de los. "El ciclo económico en la Escuela Austriaca de Economía: La relación entre la medición del Gross Output y la recaudación del IVA". REVISTA PROCESOS DE MERCADO, 20 de março de 2018, 237–56. http://dx.doi.org/10.52195/pm.v15i1.69.

Texto completo da fonte

Resumo:

El objetivo de este trabajo es profundizar en el estudio del ciclo económico y mostrar nuevas posibilidades en este campo del cono- cimiento. El punto de referencia de este trabajo es la investigación realizada por el economista Mark Skousen y plasmada en diversos libros como The strcuture of production, que basándose en la teoría del capital desarrolla una nueva magnitud para estudiar la activi- dad económica. Este nuevo indicador es el Gross Output. Por tanto, uno de los objetivos de este trabajo será comprobar la importancia de dicha magnitud en el estudio del ciclo económico, para ello, se inicia la investigación con un breve repaso a la teoría del capital y a la teoría austriaca del ciclo económico. Además, también se pre- tende estudiar si la recaudación del IVA, debido a las característi- cas técnicas del impuesto, puede ser una buena aproximación del Gross Output en el estudio de la coyuntura económica. Sin más dilación, se inicia el estudio planteado.

Estilos ABNT, Harvard, Vancouver, APA, etc.

44

Singh, Prem Kumar. "Air Quality Index Analysis Using Single-Valued Neutrosophic Plithogenic Graph for Multi-Decision Process". International Journal of Neutrosophic Science, 2021, 28–41. http://dx.doi.org/10.54216/ijns.160103.

Texto completo da fonte

Resumo:

Recently, Plithogenic set and its graphical structure visualization is stuide for dealing with multi-attribute data set. In this pocess a problem arises while characterization of uncertainty in tue, false and uncertain regions, independently. One of the suitable examples is Air Quality Index and its impact on human health contains multi-valued attributes. In this case the conflict may arise among two experts about acceptation, rejection and uncertain impact of AQI for human health. To resolve this issue a single-valued neutrosophic Plithogenic set and its graphical strcutue visualization is discussed in this paper with an illustrative example.

Estilos ABNT, Harvard, Vancouver, APA, etc.

45

Singh, Arshdeep, e Sandeep Kumar. "Strcutural, Chemical, Optical and Photocatalytic Properties of Zr Co-Doped Anatase-Rulile Mixed Phase Tio2:Ag Nanoparticles". SSRN Electronic Journal, 2022. http://dx.doi.org/10.2139/ssrn.4141016.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

46

Ling Jin-Zhong, Guo Jin-Kun, Wang Yu-cheng, Liu Xin e Wang Xiao-rui. "Research on spatial frequency shift super-resolution imaging based on evanescent wave illumination". Acta Physica Sinica, 2023, 0. http://dx.doi.org/10.7498/aps.72.20230934.

Texto completo da fonte

Resumo:

In spite of the success of fluorescence microscopes (such as STED, STORM and PALM) in biomedical field, which have realized nanometer scale imaging resolution and promoted the great development of bio-medicine, the super-resolution imaging method for non-fluorescent sample is still scarce, and the resolution still has a big gap to nanometer scale. Among existing methods, structured illumination microscopy, PSF engineering, super-oscillatory lens and microsphere assisted nanoscopy are more mature and widely applied. However, limited by the theory itself or engineering practice, the resolution of these approaches is hard to break through 50 nm, which restricts their application in many fields.<br/>Enlightened by synthetic aperture technique, researchers proposed spatial frequency shift super-resolution microscopy through shifting and combining the spatial frequency spectrum of imaging target, which is a promising super-resolution imaging scheme as its resolution limit could be broken through continually. Currently, due to the restriction of the refractive index of optical materials, the wavelength of illumination evanescent wave is hard to be shorten when generated at prism surface via total internal reflection, which determines the highest resolution of this spatial frequency shift super-resolution imaging system. Another deficiency of this scheme is the difference of imaging resolution in different directions, as only in the direction along the wave vector of illumination evanescent wave, the image has the highest resolution; while in the direction perpendicular to it, the image has the lowest resolution, as same as that obtained by far-field illumination.<br/>In order to solve the above thorny questions, a new model for evanescent wave generation has been proposed, which could generate omnidirectional evanescent wave with arbitrary wavelength based the phase modulation of nano-structure, and solve the both problem in imaging system at the same time. To verify the possibility of our scheme, we set up a complete simulation model for spatial frequency shift imaging scheme, which includes three parts:the generation of evanescent wave and its interaction with the nano-structures at imaging target, with could be simulated with FDTD algorithm; the propagation of light field from near-field to far-field, from the sample surface to the focal plane of objective lens, which could be calculated with angular spectrum theory; the propagation of light field from the focal place to the image plane, which could be calculated with Chirp-Z transform.<br/>With this complete simulation model, we compared the resolution of microscopy illuminated by evanescent wave and propagating wave, firstly. The results verified the super-resolution imaging ability of evanescent wave illumination, and also demonstrated the influence of refractive index of prism, as higher refractive index makes shorter wavelength of evanescent wave and higher resolution of spatial frequency shift imaging system. Secondly, we demonstrated the resolution difference at a series directions with a three-bar imaging target rotated to different directions. The result shows that the highest imaging resolution occurs at the direction of illumination evanescent wave vector, and the lowest resolution appears at the direction perpendicular to the wave vector. At last, we simulated the evanescent wave generated by nano-strcuture and demonstrated its properties of wavelength and vector direction. When applied to near-field illumination super-resolution imaging, the omnidirectional evanescent wave solved the both problems existing in the model of total internal reflection at prism surface.<br/>Therefore, the advantages of our scheme are higher imaging resolution and faster imaging speed, no need for multi-direction and multiple imaging, and also image post-processing. Our research opened up a new perspective of spatial frequency shift super-resolution imaging, and established a theoretical foundation for its application.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Oferecemos descontos em todos os planos premium para autores cujas obras estão incluídas em seleções literárias temáticas. Contate-nos para obter um código promocional único!