Temperature effect on compression property of multiaxial warp-knitted composites

2019 ◽  
Vol 32 (4) ◽  
pp. 469-479
Author(s):  
Xiaori Yang ◽  
Cong Wang ◽  
Xiaoping Gao ◽  
Lvtao Zhu ◽  
Yonggui Li
Keyword(s):  
Failure Strain ◽  
Turbine Blades ◽  
Effect Of Temperature ◽  
Wind Turbine Blades ◽  
Electron Microscopic ◽  
Compression Property ◽  
Compression Performance ◽  
Four Seasons ◽  
Scanning Electron Microscopic ◽  
The Relationship

The wind turbine blades are exposed to various environments all the year round, especially temperature variations during the four seasons. To study the influences of temperatures on the mechanical properties of composite materials, the compression property in the 0°, 45°, and 90° directions of the multiaxial (triaxial and quadaxial) glass fiber warp-knitted composites at −30°C, 0°C, 20°C, and 40°C was analyzed, respectively. The stress–strain curves, strength, modulus, failure strain, and the relationship between strength and temperature were obtained. The results indicated that the compression performance decreased with the increase of temperature, and the effect of temperature on quadaxial composite was more significant than that of the triaxial composite. In addition, the failure mechanisms were also analyzed according to the fracture modes and scanning electron microscopic morphologies of composites.

scholarly journals Relationship between files that bind at the apical foramen and foramen openings in maxillary central incisors - a SEM study

2011 ◽  
Vol 22 (6) ◽  
pp. 455-459 ◽  
Author(s):  
Ronaldo Araújo Souza ◽  
Yara T. Corrêa Silva Sousa ◽  
José Antônio Poli de Figueiredo ◽  
João Da Costa Pinto Dantas ◽  
Suely Colombo ◽  
...  
Keyword(s):  
Microscopic Analysis ◽  
Electron Microscopic ◽  
Significant Difference ◽  
Sem Study ◽  
Scanning Electron Microscopic ◽  
Scanning Electron Microscopic Analysis ◽  
The Mean ◽  
The One ◽  
Foraminal Area ◽  
The Relationship

Considering that instrumentation of the apical foramen has been suggested for root canal infection control, this study analyzed the relationship between the files that bind at the apical foramen and the foraminal openings in 50 maxillary central incisors. After preparation of the pulp chamber, access to the canal was obtained with #1 and 2 LA Axxess and K-files with tip cut were inserted up to the apical foramen until binding was felt. The files were fixed with methyl cyanoacrylate and the tooth-file sets were cross-sectioned 10 mm short of the apex. Scanning electron microscopic analysis was carried out and files and foraminal areas were measured using Image Tool software. Statistically significant difference (p<0.0001) was found between files and the apical foraminal areas. The mean foraminal area was 3.8 times larger than the mean file area. The results of this study suggest that it would require 4 files of greater size beyond the one that bound to the foramen in order to allow a better relationship between files and apical openings of maxillary central incisors.

Effect of Defect Characteristics on the Color of BaTiO3-Based PTC Ceramic

2016 ◽  
Vol 697 ◽  
pp. 243-247 ◽  
Author(s):  
Ai Mei Yang ◽  
Jian Ming Deng ◽  
Cong Xue Su ◽  
Wen Hao Jia ◽  
Lai Jun Liu
Keyword(s):  
Sem Analysis ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
X Ray ◽  
Electron Probe Micro Analyzer ◽  
Scanning Electron Microscopic ◽  
Temperature Measurement System ◽  
The Relationship ◽  
Structure And Microstructure ◽  
Similar Elements

The barium titanium based PTC ceramic with two kind of colors, light blue and yellow, were obtained by changing sintering processing. In order to reveal the relationship between color and electrical properties of the ceramics. The phase structure and microstructure of as synthesized samples were investigated by powder X-ray diffraction (XRD) and scanning electron microscopic (SEM) analysis. The micro area elements were characterized by electron probe micro-analyzer (EPMA) and x-ray photoelectron spectrometer (XPS). The thermo-sensitive properties were studied by resistance-temperature measurement system. The results reveal that two kinds of PTC ceramics have the same structure, similar elements, but different microstructure and valence concentration of titanium. It is suggested that difference of color of the PTC ceramics are originated from the defect concentration of titanium.

Preparation of Articular Cartilage for Scanning Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 436-437
Author(s):  
M. L. Zimny ◽  
I. Redler ◽  
J. Fernandez
Keyword(s):  
Articular Cartilage ◽  
Femoral Condyle ◽  
Tissue Preparation ◽  
Electron Microscopic ◽  
Tissue Samples ◽  
Scanning Electron Microscopic ◽  
Electron Microscopic Image ◽  
The Relationship ◽  
Scanning Electron Microscopic Image ◽  
Scanning Electron

The relationship between tissue preparation and a scanning electron microscopic image is still somewhat nebulous. For purposes of answering comments about our observations of articular cartilage, we decided to prepare tissue samples from one area of a femoral condyle, obtained at surgery, in several ways. As a result of this investigation we hoped to find the best way to prepare articular cartilage for maximal visual detail and subsequently standardize our procedures for a comparative study of normal and arthritic cartilage.The samples were fixed as follows: (1) no fixative; (2) 2% glutaraldehyde buffered with cacodylate, pH 7.4; (3) 10% buffered formalin; (4) 0.1% glutaraldehyde in Ringer's; and (5) 1% glutaraldehyde in Ringer's.

scholarly journals Identification of Debonding Damage at Spar Cap-Shear Web Joints by Artificial Neural Network Using Natural Frequency Relevant Key Features of Composite Wind Turbine Blades

2021 ◽  
Vol 11 (12) ◽  
pp. 5327
Author(s):  
Yun-Jung Jang ◽  
Hyeong-Jin Kim ◽  
Hak-Geun Kim ◽  
Ki-Weon Kang
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Wind Turbine ◽  
Natural Frequency ◽  
Structural Integrity ◽  
Natural Frequencies ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Artificial Neural ◽  
The Relationship

As the size and weight of blades increase with the recent trend toward larger wind turbines, it is important to ensure the structural integrity of the blades. For this reason, the blade consists of an upper and lower skin that receives the load directly, a shear web that supports the two skins, and a spar cap that connects the skin and the shear web. Loads generated during the operation of the wind turbine can cause debonding damage on the spar cap-shear web joints. This may change the structural stiffness of the blade and lead to a lack of integrity; therefore, it would be beneficial to be able to identify possible damage in advance. In this paper we present a model to identify debonding damage based on natural frequency. This was carried out by modeling 1105 different debonding damages, which were classified by configuration type, location, and length. After that, the natural frequencies, due to the debonding damage of the blades, were obtained through modal analysis using FE analysis. Finally, an artificial neural network was used to study the relationship between debonding damage and the natural frequencies.

scholarly journals Study on ice adhesion of composite anti-/deicing component under heating condition

2020 ◽  
Vol 29 ◽  
pp. 2633366X2091244
Author(s):  
Yishu Zhang ◽  
Long Chen ◽  
Hui Liu
Keyword(s):  
Experimental Data ◽  
Adhesion Force ◽  
Heating Temperature ◽  
Turbine Blades ◽  
Heating Time ◽  
Adhesion Forces ◽  
Wind Turbine Blades ◽  
Adhesion Properties ◽  
The Relationship ◽  
Ice Adhesion

An anti-/deicing component of composite materials for wind turbine blades is usually carried out under heating conditions. In order to study the ice adhesion properties of composite anti-/deicing component under heating conditions, an experimental platform for measuring ice adhesion force on composites was set up. Based on the heating parameters such as the heating temperature, heating voltage, and heating time, the experiments of ice adhesion of composite anti-/deicing component under deicing conditions were designed by orthogonal analysis. In this article, ice adhesion forces on composite anti-/deicing component were measured at −9.74°C, −11.58°C, −14.1°C, and −16.84°C by the proposed experiment platform, and the real ice adhesion forces under various heating parameters were measured. Through the analysis of experimental data and fitting method, the relationship between various factors and ice adhesion on composite anti-/deicing component was expounded. The influence weight of each heating parameter on the ice adhesion was analyzed. In addition, the mathematical model of ice adhesion on composite anti-/deicing component under deicing condition was established to describe the influence of deicing variables on ice adhesion in the experiments. According to the fitting function of the experimental data, the relationship between the heat consumption of composite anti-/deicing component and ice adhesion force in the process of heating is in accordance with the inverse power exponential expression, which reveals the internal relationship between ice adhesion force and energy consumption.

Investigation of a New Corrosion Inhibitor Cucurbiturils for Mild Steel in 10% Acidic Medium

2016 ◽  
Vol 18 ◽  
pp. 21-38 ◽  
Author(s):  
Elyor Berdimurodov ◽  
J. Wang ◽  
Abduvali Kholikov ◽  
Khamdam Akbarov ◽  
Bakhtiyor Burikhonov ◽  
...  
Keyword(s):  
Mild Steel ◽  
Electrochemical Impedance ◽  
Theoretical Calculations ◽  
Effect Of Temperature ◽  
Electron Microscopic ◽  
Scanning Electron Microscopic ◽  
Polarization Studies ◽  
Inhibition Property ◽  
Scanning Electron ◽  
Good Agreement

The corrosion inhibition property of cucurbiturils has studied in 10% HCl for mild steel using gravimetric, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (Tafel) and scanning electron microscopy (SEM) methods. It was found that the inhibition efficiency of inhibitors increases with increase in concentration. The effect of temperature on the corrosion rate was investigated and some thermodynamic parameters were calculated. Polarization studies show that inhibitors are of mixed type in nature. The results show that they are good inhibitors, and the adsorption of inhibitors on mild steel surface obeys Langmuir adsorption isotherm. Scanning electron microscopic (SEM) studies were used to characterize the surface morphology of uninhibited and inhibited mild steel specimens. The results obtained from experimental measurements and those from theoretical calculations are in good agreement.

Scanning Electron Microscopic Study of the Cell Surface

1969 ◽  
Vol 27 ◽  
pp. 36-37 ◽  
Author(s):  
Toichiro Kuwabara
Keyword(s):  
Tissue Fluid ◽  
Biological Application ◽  
Biological Structure ◽  
Electron Microscopic ◽  
Surface Appearance ◽  
Minute Amount ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
True Structure ◽  
Scanning Electron

Although scanning electron microscopy has a great potential in biological application, there are certain limitations in visualization of the biological structure. Satisfactory techniques to demonstrate natural surfaces of the tissue and the cell have been reported by several investigators. However, it is commonly found that the surface cell membrane is covered with a minute amount of mucin, secretory substance or tissue fluid as physiological, pathological or artefactual condition. These substances give a false surface appearance, especially when the tissue is fixed with strong fixatives. It seems important to remove these coating substances from the surface of the cell for demonstration of the true structure.

A scanning electron microscopic study on dissolving process of cholesterol gallstones by chenodeoxycholic acid (CDCA)

1978 ◽  
Vol 36 (2) ◽  
pp. 522-523
Author(s):  
T. Kanetaka ◽  
M. Cho ◽  
S. Kawamura ◽  
T. Sado ◽  
K. Hara
Keyword(s):  
Electron Microscope ◽  
Chenodeoxycholic Acid ◽  
Outer Surface ◽  
Electron Microscopic ◽  
Cholesterol Gallstones ◽  
The Core ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Acceleration Voltage ◽  
Scanning Electron

The authors have investigated the dissolution process of human cholesterol gallstones using a scanning electron microscope(SEM). This study was carried out by comparing control gallstones incubated in beagle bile with gallstones obtained from patients who were treated with chenodeoxycholic acid(CDCA).The cholesterol gallstones for this study were obtained from 14 patients. Three control patients were treated without CDCA and eleven patients were treated with CDCA 300-600 mg/day for periods ranging from four to twenty five months. It was confirmed through chemical analysis that these gallstones contained more than 80% cholesterol in both the outer surface and the core.The specimen were obtained from the outer surface and the core of the gallstones. Each specimen was attached to alminum sheet and coated with carbon to 100Å thickness. The SEM observation was made by Hitachi S-550 with 20 kV acceleration voltage and with 60-20, 000X magnification.

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