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Online since: June 2014
Authors: H. Tamjid Yamchello, R. Samin, A. Tamjidyamcholo, P. Bareji, A. Beheshti
Lean production as a method of cost reduction which improves the efficiency has been adopted by many SMEs to survive within these dynamic markets.
According to Zhou the main motivator for SMEs to adopt LPS is cost reduction.
Christer Karlsson and Pär Åhlström utilized data from a clinical field study and explored the applicability of the lean enterprise concept and its principles to small and medium-sized firms.
As such, lean production is a method of cost reduction that has been utilized by many SMEs.
Online since: June 2021
Authors: Jian Ying Yu, Xiao Bin Han, Peng He, Zi Peng Wang, Jian You Yu
Formic acid intercalated Mg-Al layered double hydroxide (Mg-Al Fo-LDH) was prepared by calcination reduction intercalation assembly technology.
In this paper, formic acid intercalated Mg-Al layered double hydroxide (Mg2/Al Fo-LDH) ice melting agent was prepared by using the baking reduction intercalation assembly technology as raw material.
The data were collected in step-scan mode at a scanning rate of 0.02°/s.
Compared with Cl-DIA, Mg2/Al Fo-LDH has a stronger melting ability on the surface ice layer of the asphalt mixture and a better reduction effect on the surface ice layer adhesion.
Online since: July 2014
Authors: Qiao Jin, Ze Yu Sun, Wan Nan Guo
Experimental and finite element study on the fatigue growth of a semi-elliptical surface crack in aX80 pipeline steelspecimen Qiao Jin1,a, Zeyu Sun1,bWannan Guo1,c 1School of Civil Engineering, Shenyang Jianzhu University, Shenyang, China agoldenfss@163.com, bsunzeyu900429@163.com,cguownlove@126.com Keywords:fatigue crack growth test; semi-elliptical surface crack; Stress intensity factor; X80 pipeline steel specimen; relative crack depth; crack aspect ratio Abstract.In this paper, a fatigue test of a X80 pipeline steel specimen with a semi-elliptical defect was performed to study the fatigue propagation stages of the Surface cracks.Based on the obtained test data, a three dimentional finite element procedure was developed for the crack growth estimation of the surface crack in the specimen.
The predictions of crack growth were compared with the test data.
Introduction The emerging carbon capture and storage(CCS) technology has been recognized worldwidely as a promising solution for green-house gas(GHG) emission reduction.
The numerical results show that one of the two simulated paths have a good agreement with the data from the specimen test
Online since: October 2014
Authors: Ondřej Holčapek, Pavel Reiterman, Petr Konvalinka, Kirill Polozhiy
Presented data are added by results of pore characteristic having essential impact to final properties.
Obtained data confirm previous assumption of retarding of hydration process during maturation, but fracture properties indicate increased durability of cement pastes with fine ceramic powder addition.
Results of mechanical properties confirmed quite expected reduction of compressive strength measured at the age 7 days.
Very interesting are data obtained of fracture energy and flexural strength determination.
Online since: June 2023
Authors: Basim O. Hasan, Hasan Sh. Majdi, Mustafa M. Hathal
This study has evaluated nine empirical correlations using an experimental data bank consisting of 1504 data points for 8 distinct gas-liquid combinations and 19 tube diameters ranging from 5.00 mm to 57.1 mm.
Agitated tank, 3.Coiled heater, 4.Agitator motor, 5.Air pump, 6.Temperature data-logger, 7.
Each time a temperature reading was taken (every 5 seconds), the data logger would save it.
When analyzing the experimental data, the size of the bubbles was determined by comparing the picture pixels to the impeller shaft.
Rao, “Heat transfer and gas holdup in a two-phase bubble column: Air-water system — Review and new data,” Exp.
Online since: February 2011
Authors: Wen Fu Wu, Zhi Gang Wang, Xiao Guang Chen
This system also can learn new vegetables growth data and representation it to control vegetable producing. 1.
The sensor has A/D transfer faction, they transfer analog signal to digital signal so that central intelligence control and processing unit can receive it. 2.2 Central Intelligence Control and Processing Unit This unit can deal with complex and illdefined problems, greenhouse vegetable production is a particular non-linear problem, there are many noisy and incomplete data, and it can be learn from examples and has powerful fault tolerance.
In this study, a computer uses to performance this faction. 2.3 Growth Database The feedback data and initial data stored in growth database.
Artificial neural networks are good for incomplete information, incomplete data sets, and nonlinear problems.
They can learn from data sets which got in practice and have robustness and fault tolerance.
Online since: March 2015
Authors: Wei Sun, Jun Sheng, Ting Shang, Yuan Kang, Jian Chao Shi
Through analyzed data of cast thin sections and scanning electron microscopy (SEM) data, analyzed the impact of main diagenesis on reservoir properties in Niuquanhu area.
Siliceous cementations have great effect on the physical property of reservoir, Quartz secondary enlargements make the degree of pore filling improving, reduction of porosity, throat narrowed, the percolation ability becomes poor, the reservoir becomes more tight (Fig.5).
The loss porosity evaluation map of compaction and cementation showed that almost all the data fall into the loss porosity of compaction area.
Online since: November 2011
Authors: Wen Bin Ci, Yutian Liu
They may cause undesirable consequences such as DC voltage reduction, temporary interruption of transmitted power, over-voltage of weak AC systems, and also DC blocks as a result of repeated commutation failures.
Commutation failures are most often caused by AC faults induced voltage reductions [2].
As is shown in equation (1), the minimum voltage reduction required to produce a commutation failure under symmetrical faults is: (1) Where, Id: Pre-fault dc current, Id’: Post-fault dc current, IdFL: Nominal dc current, Xcpu: Transformer per-unit impedance, γ: Minimum extinction angle setting; γcr: Extinction angle below which commutation fails.
Based on the operating data of 2011 Ningdong-Qingdao DC link bipolar mode, the electromagnetic transient simulation platform is built with PSCAD/EMTDC.
Online since: June 2007
Authors: Consorcio S. Namoco Jr, Takashi Iizuka, Nobuo Hatanaka, Norio Takakura, Katsuhiko Yamaguchi
Several efforts have been conducted in the sheet metal industry to improve production efficiency and savings in energy and resources through reduction in weight and cost of the metal product.
In addition, the use of thinner sheets is also essential in achieving the weight reduction of a metal product.
In the simulation of restoration and deflection tests, the restart input data method is used.
The figure also shows that the proposed technique is effective in increasing the rigidity of thin sheet metals which will result in weight reduction of formed parts. 45mm 57.5mm 10mm 10mm Specimen (1/4 model) R5 R11.115 support P hemispherical punch 45mm 57.5mm 10mm 10mm Specimen (1/4 model) R5 R5 support punch P (a) Type A loading (b)Type B loading (a) Pattern A (b) Pattern B 10 10 10 10 10 10 10 10 (d) Pattern D (c) Pattern C 10 10 1010 7.071 7.071 8.485 8.485 6.0 6.0 Table 1 Material properties used in the analysis Material SPCC Al-O SUS Young`s modulus, E (GPa) 210 69 210 Poisson`s ratio, v 0.3 0.3 0.3 Plastic coefficient, K (MPa) 489 173 1641 Work hardening coefficient, n 0.21 0.24 0.47 Density, ρ (10-6 kg/mm 3) 7.8 2.7 7.8 Table 2 Process conditions used for finite element analysis Fig. 4 Comparison of load versus
Online since: September 2011
Authors: Chao Jun Chen, Yin Bo Zhou, Yao Zhi Huang
Introduction The rapid reduction of the quantity of rural residents and rural settlements is the irreversible phenomenon in the course of urbanization and industrialization.
Urbanization results in the reduction of rural settlements and population.
The data of Suzhou in 2010 show that the total amount of the primary industry output as a percentage of the total GDP is less than 2%, but there are 3.57 million people who depend on agriculture to feed themselves.
It is a complex factor integration As such, we need to break it down to the following three steps:1. to research the quantity and the change of distribution method, based on the change of lifestyle of rural residents in the process of urbanization and the inevitable trend of the reduction of the number of rural residents ;2. to analyze the effects of rural residential cluster from the perspective of urban-rural integration, and then obtain the relevant factor integration which influences the way rural residential settlements form; 3. to compare and contrast factors obtained from the first and second items with development goals, including the maintenance and nurturing of the agricultural industry, the integration of spatial resources, the cultural heritage from the farming tradition, the protection of local geographical landscape and so on.
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