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Online since: May 2013
Authors: Haider F. Abdul Amir, Fuei Pien Chee
Even for the technologies on weather forecasting, remote sensing, global navigation positioning, satellite television and data broadcasting, telecommunications systems, as well as our surveillance and army based national security technologies are critically relied on space infrastructures.
In situ operation in data acquisition system produces results showing gradual changes in parameters during irradiation and therefore is a more accurate monitoring system as it improved the process monitoring; reduce product variance and higher throughput.
Table 1: Statistics data for percentage increase in IB (%) during irradiation Bias IC (mA) Relative Change of IB during Irradiation (%) Max.
This can be seen from the increase of non-ideal IB and decrease of IC which in turn leads to the reduction of hfe.
Radiation Effects Data Workshop, IEEE (2008), p. 124-130
Online since: January 2012
Authors: L. Campbell, Joseph D. Robson
Grain growth rapidly stagnates due to the drop in temperature and reduction in mobility as already discussed.
Data from the CCD detector is filtered to remove any background to produce scattering curves.
A limitation of the SAXS measurements is that it is not possible to obtain data from material under the tool shoulder, as the X-ray beam is unable to penetrate through the tool.
This and similar data, along with thermocouple measurements, are currently being used to further refine the model.Fig. 3: (a) Predicted contour plot showing the total volume fraction of precipitates (η' + η) predicted by the model in the grain interior.
Peter Staron and Torben Fischer are thanked for assistance with FlexiStir experiments and provision of data.
Online since: January 2012
Authors: Kohsaku Ushioda, Naoki Yoshinaga, Hajime Saitoh
In this case, the exact data on the solubility limit of C in equilibrium with cementite in b.c.c. iron is indispensable.
However, in their study, only two data points were used to determine the proportionality constant that converts the Snoek peak height into the amount of solute C.
Since the scatter of data in the relationship between the Snoek peak height and the total amount of C is so large, the question of the reliability of their results remains.
In this paper, the influence of substitutional alloying elements, such as Si, Al, and Cr, on the C solubility limit is systematically examined by exploiting the methods described above, and will be discussed along with our previous data on Fe-C-Mn and Fe-C-P ternary systems [11,12]. 2.
Vacuum-melted ingots were thus hot-rolled followed by annealing at 700ºC for 3,600 s and cold-rolling to a reduction of 80%, as described in the previous paper [11,12].
Online since: October 2011
Authors: Ke Nan Zhang, Rahman Tawfiqur, Hao Zhou, Yong Zhi Sheng, Ya Min Younis
Aerodynamics The coefficient of lift (cl) and drag (cd) data [8] were fitted into the following equations which are functions of angle of attack (α) and Mach number (M)
Specific Impulse Specific impulse data [8] was used to generate equation for approximating Isp as a function of M and α
From available data [8] for mass flow rate at 32.5 km, equation for all altitudes dependent on α and M was generated as follows; (36) (37) Where, φ is equivalence ratio which is a control parameter for scramjet propulsion system.
The model was verified using Simulink and SQP; the data was then taken for approximation of guess value of the state variables in GPOPS.
Plot of state and control variables for maximum range (color codes represent flight phases respectively) 2) Maximum Hit Velocity and Angle For max hit velocity and angle formulation, the missile cruises for about 1300 sec and then γ reduces gradually due to reduction of α from its maximum of 4.57º for a dive and hits ground at a γ of -90º and v of 658.6 m/sec.
Online since: May 2014
Authors: Chang Yan Lin, Xiu Jian Liu, Yu Yang Liu, Chuang Ye Xu, Guang Hui Wu
Requirements for the study of flow in bifurcations include creating a vessel geometry (typically reconstructed in a subject-specific or idealized manner based on medical imaging data), specifying rheological properties such as blood density and viscosity, prescribing the hemodynamic state at the entrance and exit of vessels (known as boundary conditions) and a powerful computer [20].
The patient’s volume CTA data before stenting and 1 year follow-up were used to generate three-dimensional (3D) coronary models.
Firstly the original CTA data was saved in digital imaging and communication in medicine (DICOM) format, and then transferred to the Vascular Modeling Toolkit(VMTK) for image after-processing and segmentation.
The 3D volume data was postprocessed and segmented using a semiautomatic method with a CT number thresholding technique, and manual editing was performed in some slices to remove soft tissues.
Conclusion Lower WSS at stenting segment may be a potential risk forecast of in-stent restenosis, and the influence of pressure change is not as essential as WSS reduction to ISR occurrence.
Online since: February 2013
Authors: Wen Ming Wang, Ya Peng Yu
Matching algorithm based on the gray projection is that two-dimensional image gray values are projected respectively and transformed into two independent groups of data, then On the basis of one-dimensional data, begins image matching [9].
As a result of dimension reduction, greatly reduces the calculation amount in the matching operation, thus greatly improves the matching speed.
It should be a single channel, the 8- bit or bits of 32- float image; Templ: search template, cannot be greater than the input image, and with the input image having the same data type; Result: comparison of outcome mapping image.
This module was developed by the Java language, interface structure was built by using the Java Swing packet, use JNI interface to communicate and exchange data with bottom layer. " Input Video " can obtain video by selecting from a camera or a local AVI file; " Frame " and " Panorama " is to select whether they need to be saved to the local computer ,that is to say whether the video captured from a video camera and panorama image file will be saved to the local hard disk.
Online since: October 2014
Authors: B. Dutta, F.H. Froes
Technology Overview All the Additive Manufacturing (AM) technologies are based on the principle of creating a toolpath, uploading this data in the machine, and building the part up layer by layer following the sliced model data using a heat source (laser, electron beam or electric arc) and feed stock (metal powder or wire).
Layer by layer tool path tracing is governed by the CAD data of the part being built.
This allows a significant reduction of the preform size and weight through the elimination of the need for a machining allowance.
While PBF technologies offer the ability to build hollow near net shapes with finer resolution, DED based technologies offer the ability to add features on existing parts and remanufacture/repair damaged parts, besides building parts directly from CAD data.
Online since: May 2011
Authors: Zhen Xing Gao, Ling Xu
Introduction Semi-rigid connections of steel frames has been paid more and more attention in the design and research fields of steel structure at home and abroad, for its good load bearing performance, simple structure, fast construction, easy-to-guarantee quality, the save of steel in node, the increase of the structural damping, extending of the cycle, the decrease of the amplitude, the increase of the ductility, the reduction of seismic damage, and some other favorable conditions.
But very little test data and research information in T type member of attachments.
The value of strain is output by static electrical resistance data acquisition instrument-UCAM-70A.
Analysis comparatively of the test between two types of node Load-displacement curve obtained in this test is shown in Fig. 3, main test data is shown in Table 2.
Table 2 The primary data Specimen number Ultimate load Pu (kN) Elastic limit (kN) Ultimate displace- ment (mm) Elastic displacement (mm) Nodal limit rotation of node (rad) nodal moment corresponding with Pu (kN·m) TA-1 82.4 48.7 134.7 14.8 0.060 123.6 TA-2 86.9 37.4 125.9 14.6 0.068 130.3 TB-1 94.7 53.8 91.7 15.7 0.059 142.1 TB-2 96.3 55.2 110.7 19.8 0.053 144.4 TB-3 93.2 40.4 104.2 11.6 0.046 139.8 (2)Both two semi-rigid connections have good tensibility and deformation, and the shock resistant quality is good as well.
Online since: May 2016
Authors: Andrea Parisini, Roberta Nipoti, Antonella Parisini, Marco Gorni
In the Arrhenius plot of the resistivity data, the transition from a VB to an IB transport is generally marked by a sudden variation of the slope of the corresponding linear regions [6].
A reduction of the VRH transport dimensionality suggests the possibility that structural modifications have taken place in the implanted and annealed 4H-SiC layer.
In fact, a 2D character Fig.1 Logarithm of experimental conductivity data (a) versus T(-1/3) for the Al implanted samples, consistent with a 2D VRH law, σT=σ0exp-T0T13; (b) versus T(-1/4) to test the agreement with the law σT=σ0exp-T0T14 (3D VRH) In both the figures: continuous lines are only guides for eyes, vertical dashed lines show reference temperatures (see the text).
Moreover, its value is expected to be of a few tens of nanometers as this is the value of Ropt estimated from the data of Table I for a localization length of a few nanometers, a value comparable to the average separation among activated impurities [5].
This hypothesis gives us a key to interpret the data of the last two columns in Table I.
Online since: December 2007
Authors: Q.C. Ma, X.W. Liu
This necessity is driven by the highly competitive nature of the automotive supply business, the complexity of product derivatives, and the requirement for year-on-year reduction of unit cost for manufacturing.
Now the company's major problems are that excessive design cycle time is required for repetitive tasks such as the design of similar functional modules/products for each one-off order, and it is difficult and time-consuming to provide accurate life cycle costing and reliability data to customers on demand.
Fig.1 KBE system Fig.2 Knowledge modeling procedures Identify Justify Capture Structure Formalize Implement KBE System KBE applications KBE language Knowledge model KBE engine Product meta-model Product Data 3D Models BOM … Knowledge Representation How to represent the captured knowledge in a KBE knowledge model?
Integration of the CAx applications is usually through data exchange via some form of file transfer protocol or standard, such as IGES, STEP, and etc.
Using current data exchange standards, it is only possible to transform an instance of the design between two different digital tools and/or KBE applications and not the knowledge embodied in the design.
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