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Online since: February 2015
Authors: László Dévényi, Miksa Kovács, Dóra Károly
Table 1 shows the investigated stent systems' nominal properties.
Results Table 2 MSA and the according properties of stents with the manual method.
We plan to use the obtained image data to create a three-dimensional stent models and run finite-element simulations to predict mechanical properties of stents with given defined patterns.
Dobránszky, Different properties of coronary stents, Anyagok világa, 7:2 (2007) 1-7
Dobránszky, Mechanical properties of coronary vein – in vitro evaluation of longitudinal and transversal samples, Biomechanica Hungarica 3:1 (2010) 24-32
Online since: May 2015
Authors: Juergen Lackner, Marcin Kot, Kinga Chronowska-Przywara, Łukasz Major
The properties of such coatings could be a combination of the properties of materials that build multilayers, or even significantly surpass them.
Both of them depend on the mechanical properties of the coating and substrate, coating thickness, state of residual stress as well as the test parameters [17,20,21].
Mechanical tests The study of micro-mechanical properties was carried out using the Micro-Combi-Tester (MCT) produced by CSM Instruments.
The test results confirm the significant impact of the substrate hardness on the micro-mechanical properties of the coated surface.
The observed trend of increasing the micro-mechanical properties of multilayers with a decreasing l parameter is not confirmed for the 16xCr/CrN coating, with its worse properties compared to 4xCr/CrN.
Online since: October 2015
Authors: Khosrow Ghavami, Michéle dal Toé Casagrande, Alexandr Zhemchuzhnikov
When the compaction properties of a soil are known, it is possible to prepare samples in the laboratory representative of the material in the field to be used for the determination of its engineering characteristics.
Unlike in Proctor test, where the energy transmitted to the soil is constant, the energy in static compaction test, which can be calculated by integration of force-displacement curve, for a constant maximum pressure or strain depends on a number of factors such as soil type and water content.
If performed slowly, the higher densities can be achieved without affecting CEB quality.
Morel, “Strength and elasto-plastic properties of non-industrial building materials manufactured with clay as a natural binder,” Appl.
Jayawickrama, “Engineering Properties of Unstabilized Compressed Earth Blocks,” in Geo-Frontiers 2011: Advances in Geotechnical Engineering, 2011, pp. 2679–2688
Online since: October 2013
Authors: Dong Pyo Hong, Kil To Chong, Deok Jin Lee
Target Tracking in Sensor Networks Using Additive Divided Difference Information Filtering Method Deok Jin Lee1,§ , Kil To Chong2 and Dong Pyo Hong3 1School of Mechanical & Automotive Engineering, Kunsan National University, Gunsan, Jeonbuk, 573-701, South Korea 2School of Electronics Engineering, Chonbuk National University, Jeonju, Jeonbuk, 561-756, South Korea 3Dept. of Mechanical Systems Engineering, Chonbuk National University, Jeonju, Jeonbuk, 561-756, South Korea § deokjlee@kunsan.ac.kr Keywords: distributed sensor networks, multiple sensor fusion, target tracking, divided difference information filter, nonlinear estimation.
However, some of the drawbacks, inherited from the EKF due to unmodeled or unknown uncertainties, can affect the EIF in terms of the estimation accuracy and robustness in nonlinear systems.
Then, a set of weighted scaled symmetric sigma point vectors is constructed by (3) where is the dimension of the augmented state vector, is the ith sigma point column vector of the compound square-root matrix and is a scaling weight factor for the divided difference step size or interval length [11].
Each component matrix is given by (9) where the weight factors for the covariance matrix are given by (10) For the measurement update, the augmented state vector and the augmented square-root matrix are reconstructed by (11) where is given in Eq. (8) and is obtained from the Cholesky factorization of the measurement noise covariance matrix, .
The simulation results show that the proposed additive divided information filter provides not only accurate estimation and fast convergence properties, but also makes its implementation efficient for multi-sensor estimation in distributed sensor observation and networks.
Online since: May 2014
Authors: Rong Li Gai, Fei Gao, Xiao Hui Sun, Hong Zheng Li, Li Ming Duan
There has three popular categories of word segmentation algorithm [2]:1)Based on mechanical matching;2)Based on the understanding;3)Based on statistical.
At present, the word segmentation based on mechanical matching which is also called word segmentation based on string matching is the dominant.
After segmentation, each sentence will has variety of properties, such as word segmentation number S, single dictionary word count D, non-dictionary single word count N, biggest word length L.
Although majority of ambiguous are crossing ambiguity, but the wrong segmentation will affect the segmentation accuracy, so the combination of different meanings field is need to study the direction of further development, make the segmentation accuracy are improved further.
Because the structure of the dictionary is an important factor related to the speed of word segmentation [9] in the mechanism method.
Online since: November 2012
Authors: Xiao Chu Wang, Wei Li, Jian Peng Zhang
An Overview of the Study and Application of Rubberized Portland Cement Concrete Wei Li1,2,a ,Xiaochu Wang1,2,b,Jianpeng Zhang1,c 1Shenyang University, Liaoning, Shenyang, 110044,China 2The Key Laboratory of Geoenvironmental Engineering, Liaoning, Shenyang, 110044,China asydxlw@163. com (corresponding author), bwangxiaochu@126.com, czjpsdwf@163.com Keywords:rubberized portland cement concrete; rubber particles; amount; properties Abstract.
Rubber improves the internal structure of concrete mainly and doesn't change its chemistry performance of all kinds of concrete material through the physical and mechanical role, so it doesn't undermine the durability of concrete.
At present, the rubberized portland cement concrete at home and abroad was mainly concentrated in these aspects that strength, deformation, durability, sound insulation, heat insulation and shock absorption properties.
Durability performance The pore structure of concrete is the main factor that affects durability and other performance of concrete.
When a small content of the rubber powder is added to the high-strength concrete, it has little effect on the strength of the concrete, while, porous microstructure of the rubber particles and the formation of more dense channel after heating to melt can strengthen the connectivity of the pore and improve the performance that fracture properties of burst of the high-strength concrete material burst under high temperatures.
Online since: February 2026
Authors: Ibukunoluwa Adetutu Olajide, Isaac Amarachukwu Ononlememe
Environmental factors such as fog, precipitation, snow, particulate matter, and atmospheric turbulence can significantly impair the quality of optical signals, consequently diminishing the reliability and availability of communication links [6].
Wind serves a dual function: it acts as a mechanical stressor capable of inducing physical displacement or vibration to optical transceivers (notably those affixed to poles, rooftops, or unmanned aerial vehicles), while concurrently affecting dynamic atmospheric turbulence by altering temperature gradients and airflows, which subsequently influences the refractive index structure constant (Cn2).
This study also analyzes the combined effects of these factors using a partially coherent Gaussian beam model, showing that the optimization of beam width and receiver aperture size significantly enhances channel capacity.
The authors emphasize that while FSO communication is advantageous due to its license-free operation, high data rates, and inherent security, its performance is highly susceptible to atmospheric turbulence, fog, aerosol scattering, and other environmental factors.
Specifically, by monitoring the photodiode output and observing fluctuations in signal strength displayed on the LCD, researchers can correlate variations with environmental factors like atmospheric wind speed.
Online since: April 2004
Authors: Do Won Seo, Yang Bae Jeon, Jae Kyoo Lim
Fig. 1 shows schematic of tensile-shear test specimen and Tables 1 and 2 show the chemical composition, and the mechanical properties and surface condition of GA45 steel plate respectively [2].
Evaluation of Mechanical Properties General tensile test was conducted for mechanical properties evaluation about spot welding specimens.
Nugget diameters of specimens were measured as the main factor to evaluate welding quality.
Mechanical properties and surface conditions of GA45 steel plate Tensile strength (MPa) Yield strength (MPa) Elongation (%) Thickness (mm) Coating wt.
HAZ (heat affected zone) is expanded by the increase of electric weld current, and the area where spatter generates increases.
Online since: June 2008
Authors: M. Neil James
This is because they are affected by a wide range of factors, and can occur as a result of deficiencies in, and subtle interplay amongst, design methods, manufacturing and fabrication processes, materials selection and performance, and operation and maintenance.
Factors that influence local hardness around joints, and features such as cut-outs hence influence susceptibility to LMAC.
This is free-cutting steel containing dispersed lead particles, with the M grades manufactured to close limits on chemical composition and mechanical properties.
The bolts were, in fact, supplied as grade A steel, indicating no check was specified for mechanical properties.
Thus two main factors contributed to causing this accident; failure of the towbar and failure to ensure that the aircraft taxiway braking system was operative.
Online since: May 2024
Authors: Ario Sunar Baskoro, Pathya Rupajati, Tri Haryanto Soleh Atmaja, Laksita Aji Safitri
Monitoring temperature and RPM during welding with thermocouples and tachometers, mechanical properties are assessed through tensile shear tests, microhardness measurements, and macrostructural observations.
The weld outcome is influenced by various factors associated with the tool, including its features, material, diameter, and shoulder type.
These diverse approaches offer insights into the influence of individual factors and interactions between them on the functional objective [8].
Chen, Influence of Welding Parameter on Macrostructural and Thermomechanical Properties in Micro Friction Stir Welded Under High Speed Rotation, The Int.
Kiswanto, Effect of Tool Profile on Mechanical Properties, Temperature, and RPM Using Micro Friction Stir Spot Welding (mFSSW) on Aluminum Alloy AA1100: submitted to IOP Proceeding (2023) [7] ISO 14273, Resistance Welding – Destructive Testing of Welds – Specimen Dimensions and Procedure for Tensile Shear Testing Resistance Spot and Embossed Projection Welds, ISO, (2016)
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