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Online since: June 2014
Authors: Sergey N. Kharlamov, A.V. Malozemov
Research data of flow local properties.
Measurements (fig.3, b) correspond to the data of A.Wegmann, P.
This information also corresponds to the experimental data [5].
On the figure 6 there are represented the data of distribution of wall friction over the pipeline and reduction of wall friction relative to high-viscosity core due to formation of water ring.
The data describe the behavior of friction factor at the condition of steady turbulent flow (D=5,6mm.
Online since: August 2018
Authors: Andrea Sellitto, Aniello Riccio, Mauro Zarrelli, Salvatore Saputo, Giovanni Conte
The numerical model has been validated by comparing the ABAQUS numerical results to the experimental data obtained by an ad-hoc campaign including mechanical tests under variable thermal conditions.
Each data acquired from the heat flux meters has been filtered and linearized.
In particular, in Figure 6 the strains at 3, 4, and 5 locations (according to Figure 2), as a function of the applied load are introduced and compared to experimental data measured during the first cold mechanical loading step.
It is worth to notice that, despite the incident heat flux has been extrapolated from few locations to the entire panel by the ABAQUS mapping function, the obtained numerical results show a good agreement with the experiment data.
Again, the agreement between numerical results and experimental data is very good.
Online since: December 2013
Authors: Bo Wang, Tao Qi
In view of the current status of manual adjustment-dominated heating network adjustment, time-consuming information feedback and network balance, failure of network balance to achieve the best condition, and uneven heat and cold in a district, heat supply automation transformation technology program in this district is proposed to improve the efficiency of heating network and achieve the goal of energy conservation and emission reduction.
Basis and application standard The basis for the provided program is: The heat company in this region provides Preliminary Work of Heat Supply Network Monitoring System Research of Property Company;The heat company in this region provides Data Sheet of Heat Exchange Station, including data of current heat supply area and planned heat supply area, etc;The heat company in this region provides Heating Operation Daily Report of Property Company in Development Zone, with altogether 11 copies;The heat company in this region provides Pipe Network Floor Plan;The heat company in this region provides Heat Resource Notes;Urban Heat Supply Pipe Network Construction and Acceptance Code, CJJ28-89;Urban Heat Network Design Code, CJJ34-90;Standard for quality inspection and assessment of urban heat supply pipe network, CJJ38-90;Heating engineering terms, CJJ55-93.
According to the data analysis of Heating Operation Daily Report, it could be seen that the operating status of water pump is as follows:Water pump in heat exchange station runs according to the way of constant flow or phased change flow;Most heat exchange stations could meet the heating needs by just starting one water pump;A part of heat exchange stations turn the export valve of water pump to a small opening;A part of heat exchange stations actually have an excessive square meter flow index.
The reduction of minimum flow of pipe network or water pump to the minimum flow is determined by the unbalanced situation of secondary pipe network level.
The implementation of automatic control program reduces the unbalanced degree of pipe network level (according to the analysis of running data, the current unbalanced degree is between 15% and 20%) on the one hand, making the temperature distribution of heat supply room more even.On the other hand, when heat source exceeds users’ requests of heat for a long time, the flow reduction could lower the consumption of primary energy.
Online since: August 2012
Authors: J.B. Manuel, M.J. Diniz, Uílame Umbelino Gomes, J.H. Araújo, Ariadne de Souza Silva
The reduction of the particle size is very important to get better properties of the hard metal.
The reduction of the coercitive field with milling time increase can be related with the reduction of free cobalt in composite.
The reduction of density can be related with the appearance of the non magnetic phases and reduction the hardness is related the reduction of density.
The hardness increase with the reduction of the particle size (pores reduction), this also originates an increase in the coercitive field.
Third edition, publisher by International Carbide Data.
Online since: October 2013
Authors: He Sheng Tang, Li Jun Xie, Song Tao Xue
In reality, the situation where the experimental data are limited and still need to study the probability characteristic of the fatigue lifetime is regularly encountered.
The prognosis uses fracture mechanics-based fatigue crack growth modeling, along with quantification of various sources of uncertainty, including natural variability, data uncertainty.
According to the experimental data in [14], the interval bounds on Paris parameters (a logarithm to base 10) and are and .respectively.
This section uses the 7th-order SC method to analyze the probability characteristics of fatigue life of a damaged plate in case of limited experimental data ([14]).
An example based on limited experimental data is used to demonstrate the effectiveness of the proposed approach.
Online since: November 2012
Authors: Yu Qing Zhou
It studies the key technology in the process of data acquisition, data pre-processing and model reconstruction, and put forward a model reconstruction method to improve the blades design efficiency.
Data acquisition and pre-processing Data acquisition In reverse engineering, data acquisition method for object surface subdivided into contact and non-contact[3].
Pre-processing of point cloud includes noise point remove, data compaction and data extract.
Data compaction can reduce total data amount and improve the data pre-processing speed, but too much data reduction will effect the precision of model construction, so the point cloud is reduced in the condition of guaranteed precision The separation parts should be kept after point cloud reduction, it is useful for making surface shape when surface is designed, and also can provide precision data for subsequent surface modeling, Importing point cloud in Geomagic software for pre-processing, in order to indentify the characteristics of the model, the point cloud display style is changed to grid establishment style, as shown in Fig. 2.
British library Cataloguing in Publication Data.2008:05-120
Online since: January 2010
Authors: Giuliano Angella
In the second heat treatment alloy the work hardening data showed a single linear region at high stresses, whilst no linear stage occurred at low stresses.
In HT2 material the work hardening data show a single linear behaviour, limited only at high stresses.
The linear data at high stresses are not significantly different to the HT1 alloy and they can be attributed to the Stage III of work hardening, i.e.
In the HT1material the work hardening data presented two linear regions: at high stresses the linearity has been described as the conventional Stage III of work hardening, whilst at low stresses the data linearity has not been rationalised in any conventional stage of work hardening.
In the HT2 alloy the work hardening data showed a single linear region at high stresses, i.e.
Online since: October 2011
Authors: T.M.I. Mahlia, Rahman Saidur, Arridina Susan Silitonga, A.E. Atabani
Data collection The targeted pulp and paper industries in this section have been taken from a previous survey that focused on the overall industrial sector in Malaysia in different regions within Peninsula Malaysia as shown in Table 1.
For example, Annual energy saving increased from 1,059,207 kWh in 10% speed reduction to 3,658,369 kWh in 60% speed reduction.
Cost benefit analysis when using variable speed drives Based on the input data of VSD incremental price in Table 6 and total annual energy saving Figure 6, the results of total annual bill saving with an average electricity price of RM 0.236/kWh and average payback period have been quantified and illustrated in Figures 8 and 9 respectively: Figure 8 Total annual bill saving (RM/year) at different speed reduction.
The results from Figure 8 show that the total annual bill savings when installing VSD in the covered industrial boilers in this study are about RM 249,973 in 10% speed reduction, RM 723,169 in 40% speed reduction and RM 863,375 in 60% speed reduction.
Figure 9 Average payback periods at different speed reduction.
Online since: March 2015
Authors: Si Hui Shu, Zi Zhi Lin
The approximate merging of two adjacent B-spline surfaces into a B-spline surface is the core problem in data communication.
Introduction Data conversion is a core problem in data communication between different CAD systems [1-4].
In [1], hoschek proposes that approximate conversion include two problems: degree reduction and merging.
[6] D lutterkort ,J Peter ,U peig .Polynimial degree reduction in the -norm equals best Euclidean approximation of Bezier coefficients, Computer-Aided Geom Design.
[8] Q Q Hu, G J Wang, Optimal multi-degree reduction of triangular Bezier surfaces with corners continuity in norm , Compute Appl Math.
Online since: October 2014
Authors: Dong Xiang, Lu Dan Shi, Ke Gao Liu
It proposed controllable preparation of this type thin film by chemical solution deposition and co-reduction, and study on the crystal orientation and regulation of the band gap gradient.
It intends to prepare Cu-AⅢ-BⅥ2 compound crystalline films using chemical solution deposition and co-reduction method.
Study on the structures and photoelectric properties of copper-based chalcogenide crystal thin films: (1) In the aspect of material structures, it mainly includes phases, lattice constants and defect, thickness of crystalline films, binding between film and substrate, surface morphology and interface structures of multilayer films etc.; (2) In the aspect of optical properties, by the transmission spectrum and reflection spectrum analysis and data processing, it will obtain the absorption intensity of light and to calculate the band gap of the crystalline thin films; (3) In the aspect of electrical performance, it need to measure the variable-temperature Hall coefficients and conductivity types, carrier concentration and mobility, the resistivity of crystalline thin film samples; By making product film samples into battery devices, the I-V curve, short-circuit current (Jsc), open circuit voltage (Voc), fill factor (FF) and conversion efficiency (η) and other properties of the battery
For the convenient measurement of the product thin films, the films with lower porosity and mm thickness can be obtained by repeating many times of spin coating-drying-reduction process and heat treatment and other steps.
Summary This research program proposed that copper-based chalcogenide crystal thin films can be prepared by chemical solution deposition and co-reduction, This method is low cost, easy to operate, and easy to get the desired chemical composition and phase.
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