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Online since: June 2013
Authors: Siri Harboe, Michael Modigell
Modigell2,b 1,2Aachener Verfahrenstechnik, Institute of Mechanical Process Engineering, RWTH Aachen University, Turmstr. 46, 52056 Aachen, Germany.
The yield stress of a suspension can be described as a function of the structural properties.
The loss angle δ = arctan (G'/G'') describes the relation of viscous and elastic properties in the material.
This showed that the material alters from viscous to more elastic during the initial seconds, then the relation of the viscous (G'') and elastic (G') properties becomes constant.
These investigations show that the shear rate applied to semi-solid metal alloys is crucial for their yield stress and therefore for their flow properties.
Online since: April 2012
Authors: Dierk Raabe, Franz Roters, Nicola Peranio
However, a few significant differences were also found for both annealing methods: (i) The volume fraction of recrystallized ferrite at the center of the sheet was found to be by a factor of two larger after annealing in salt bath than after conductive annealing, Figs. 4, 6, which indicates less recovery and thereby a reduction of strain energy as driving force for recrystallization.
Phase transformation was found to be dominant at annealing temperatures larger than 740°C and yielded a dramatic effect on microstructure and therefore on mechanical properties.
The difference might be explained by several factors.
These last two observations are closely related to the factors which determine the incubation and recrystallization times.
Therefore, pearlite is affected by phase transformation before ferrite.
Online since: March 2008
Authors: S.A. Golovin, Igor S. Golovin, H.R. Sinning, S. Jäger, V.A. Semin, G.V. Serzhantova, Olga A. Sokolova, F. Stein
Carbon-containing Fe - Si and Fe - Si - Al alloys were studied with respect to the carbon- related Snoek-type and Zener relaxation using different mechanical spectroscopy techniques.
Introduction Alloying elements in iron affect carbon atom diffusion and distribution in the solid solution and between solid solution and carbides.
In order to avoid texture effects, all specimens for mechanical properties testing were cut from the central area with equiaxed grains.
The Arrhenius plot for the carbon Snoek peak in α- Fe quenched from 1000 K yields an activation energy H = 0.84 ± 0.02 eV and a value for the pre- exponential factor in the Arrhenius plot of the relaxation time τ0 ≈ 4.7 × 10–15 s.
San Juan, in: Mechanical Spectroscopy Q-1 2001, edited by R.
Online since: June 2023
Authors: Vinayak Adimule, Tribikram Gupta, S. Vaijayanthimala, N. Rajeswari Yogamalar, Kalpana Sharma
The performance is driven not just by the specific surface area (SSA) but two additional factors, namely the pore size and the geometry of the carbon nanostructure.
This affects the power output adversely.
Table 1 shows the electrochemical properties of some recently used MOF-based materials.
This has to be achieved without compromising on the core electrochemical properties.
“Influence of Nano Particles on Optical Properties of Cu-MOFs.”
Online since: May 2012
Authors: Chao Li, Kuang Yi Zhan, Zhen Yu Xie
The climate suitability of double-skin wall for high rise building The categories of double-skin used in the design and practice of the high rise are various, while the application of double-skin technology is based on the balance between the climate elements and the function characteristics, thus taking into consideration the influence of different factors is necessary, among them, regional environment and the building orientation are the most important parts.
The chimney effect of the glass double-skin could not satisfy the requirements of heat dissipation in summer, so the auxiliary shutter and the mechanical exhaust are in need.
Because some parts of the cold region and the hot summer and cold winter region need to emphasize the thermal insulation and heat preservation, the heat regulation double-skin which possesses the double property is suitable to be used in this region.
The heat gain of the east and west are relative high, but the east gains heat from the sunrise(7:00—9:00), in the case of losing of interior heat in the evening, even gaining a large amount of solar radiation will not largely impact the comfort of the interior; On contrast, the west elevation absorbs the heat at 15:00 and the west solar radiation will badly affect the comfort of the interior environment on the basis of the all-day thermal cumulation.
Online since: December 2013
Authors: Jian Feng He, Lei Ma, Shou Jun Cao
In addition, the data scattered in different departments is lack of standardization, and info sharing is unable, which causesreluctant info deficiency and asymmetric problems of energy management [1].Moreover, with the increase of application demands and serviceable cycle, the quantity of data processing and complexity are dramatically climbing up.Previous management style can’t suit the requirement of energy management with the fast growth of economy and society due to some unavoidable factors such as space-time misplacement of supply and demand, the increment of proruption and uncertainty, shortened period and enlarged influence [2].
The core objective of index management is to establish systems of energy statistic index, energy consumption statistic index, monitoring and assessment, and energy forecast index. 1.3 Monitoring and early warning analysis system The energy status function can be evaluated simply and directly to effectively monitor the status, assess the scope and degree affected by the periodic fluctuation of energy, and reveal early warning signals [4], based on the integrated index and diffuse index of prosperity analysis, and the selection and establishment of early warning signal index and lights with functions of evaluation and prediction for the trend of prosperity.
It also can cover simple functions of data processing, such as cleaning, integration and property stipulation.
[5] Seung Woo Lee, So Jeong Nam,Jai-Kyung Lee et al.Real-time data acquisition system and HMI for MES [J].Journal of Mechanical Science and Technology.26(2012)2381-2388
Online since: August 2012
Authors: Jian Guo Ding, Zhi Qiao
At present, the research achievements for the destroyed mechanism and mechanical model of the structure for this new-style multi-layer frame-bent industrial building under the action of earthquake are seldom at home and abroad.
It uses a simplified mechanical model instead of the original structure.
So that, we can obtain the participation factor of each vibration pattern
Notes: The numbers in the figure represent the location of the property hinges and the values represent the sequence of plastic hinges Fig.6 The location and order of plastic hinges of each rod bent From Fig.6 , we can get that each lumped mass points of the left span of the second layer of the structure yielded and the plastic hinges appeared in turn.
(5) From the deformation and internal forces of the new multi-storey frame structure in several different seismic waves, we can conclude that seismic waves significantly affect the seismic performance of the structure.
Online since: December 2013
Authors: M. A. Karim, Suvash C. Saha, Sarah Miller, Prasad K. D. V. Yarlagadda, Majedul Islam
Required values in the equations are daily normal insolation, and the spectral selective properties of the collector components.
Dudley et al. [1] have published detailed collector geometry, surface optical properties and performance data under conditions slightly different to those used in SEGS plants.
Table 1 Spectral selectivity of LS2 collector components Collector components Selective properties Forristall [6] Trough mirror r 0.9337 Glass envelop t 0.935 r 0.045 a 0.02 Cermet coating a 0.92 Black chrome coating a 0.94 Number of rays and grid checking.
Furthermore, the coincidence of all graphs implies that, the LCR is directly proportional to the DNI and the spectral selective properties of the collector components.
Local irradiance is expressed as a direct function of the receiver angular location in the equations, in which daily normal insolation, and the spectral selective properties of the collector components are the required input parameters.
Online since: April 2014
Authors: Fritz Klocke, Fabian Schongen, Daniel Heinen, Kristian Arntz, Yuan Liu, Vladimir Bäcker, Björn Feldhaus
The objective of a laser surface treatment is to modify the material properties that the result is a high toughness of the base material and a high surface hardness.
The most common deposition processes in production for enhancing the surface properties of highly stressed parts are shown in Figure 2.
So unintentional alloys between base and additive material with insufficient properties are avoided.
This means, properties of the laser treated surface of the part depend on solidification conditions [15].
Tool steels – deciding factor in worldwide production.
Online since: February 2026
Authors: Audrey Huong, Xavier Ngu, Hui Ling Chua, Kim Gaik Tay, Kok Beng Gan, Ser Lee Loh
Medical conditions are the leading factors of poor circulation.
These include diabetes, peripheral artery disease (PAD), Raynaud’s disease, obesity, and heart conditions [1,2], followed by other risk-related factors, e.g., age, stress, physical fitness, and unhealthy lifestyles.
Clinical equipment, such as ultrasound and X-ray machines, has a limited ability to access the tissue’s functional properties, and the operation of these technologies can be expensive.
PA technology inherits the advantages of optical and ultrasound techniques because of its excellent imaging contrast, which is based upon the absorption properties of the tissue constituents and the deep penetrability of ultrasound imaging [11].
Zhang, Risk factors and predictive model construction for lower extremity arterial disease in diabetic patients, PloS one 19 (2024) e0314862
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