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Online since: May 2012
Authors: Ji Jun Yang, Yong Han, Chen Hua Xu, Yu Hua Zhao
Optimal model of industrial structure is described below: (1) industry set (players) Letas the finite set of industries, then, the entire national economy consists of -industries. refers to player (industry), and. is the number of national industry.
According to the different classification, the number of industries is various.
Assuming that there are (number of entire industry) in regional economy.
Labor productivity is given as follows: (3) Where, is the number of employees in industry. ③environmental pollution degree.Environmental pollution degree is defined as follows: (4) Where, is the unit cost of contaminants caused by industry ; denotes the total emission of pollutants by industry .
The game analysis of grain circulation market in China.
Online since: September 2005
Authors: Jürgen Hirsch
Earing measurement is a typical quality measure for plastic anisotropy of sheets, where the anisotropy can be expressed in a single number 'Z' = ∆ h / h0 of the relative height of ears to troughs /3/.
This number must usually be minimised in sheet production to ensure optimum production performance, e.g. in can manufacturing processes.
The first (weak) ß-fibre intensities are mainly formed by the rotation of initially randomly orientated grains.
However, then also the 0°/180° ears would increase and also the early and faster drop of 90°/270° must be extrapolated, i.e. a six ear problem might occur QUANTITATIVE DESCRIPTION OF DEEP DRAWN CUP PROFILES Due to its characteristic harmonic symmetry earing profiles (along αααα) can quantitatively be described by a small number of even (cosinus) Fourier series expansion coefficients in the form : h (αααα) = ΣΣΣΣn fn * cos (nαααα) , expansion degree n = 0, 2, 4, 6 . . .
A quite small number of coefficients is sufficient for a very good agreement [4] so Fourier expansion provides a new method for an efficient and accurate description of cup profiles in aluminium sheet.
Online since: August 2013
Authors: Song Wei Jia
Because tillage induces changes in soil structure, thus affects the movement of water, fertilizer, gas, heat and crop roots in the soil, and accelerates soil respiration, and finally it results in a large number of organic carbon decomposing and emitting into the atmosphere in the form of CO2.
Since the 20th century, due to rapid expansion of the world’s population, a large number of forest, grassland have been reclaimed as farmland, thus these result in a large number of SOC being released into the atmosphere, contributing to the global warming.
At present, it transforms from a country with low-energy consumption into that with high energy-consuming in China, then a large number of CO2 will be emitted, which is the primary contradiction between economic development and protecting the environment.
Erosion control with no-tillage and reduced till corn for silage and grain.
Online since: February 2013
Authors: Hong Jie Zeng, Lai Qi Zhang, You Cha Zhang, Pen Jia, Xin Yu He, Jun Pin Lin
The grain size distribution of air plasma spraying is wide than that of HVOF and the powder feed rate is continuously adjustable.
The number of thermal cycles was recorded and was the average of 3 measurements for every kind of sample.
The cycling number of HVOF Ti28.15Al63.4Nb8.25Y coatings reached 116 in thermal shock test, but the cycling number of APS Ti28.15Al63.4Nb8.25Y coatings was only 26.
Fig.7 Cycling number of HVOF and APS Ti28.15Al63.4Nb8.25Y coatings (a) 50 mm Spallation Spallation (b) 50 mm Fig.8 Optical photograph of coatings after thermal shock test: (a) APS coating; (b) HVOF coating Conclusions (1) HVOF Ti28.15Al63.4Nb8.25Y coatings have more uniform and compact morphology than APS Ti28.15Al63.4Nb8.25Y coating
Online since: December 2023
Authors: Kannan Sekar, Pandian Vasanthakumar
(a) Corrosion equipment set up, (b) Specimen Differential scanning calorimeter test The differential scanning calorimeter (DSC) is commonly utilized to characterize the solid-state response of materials, including phenomena such as grain growth, recrystallization, precipitation, dissolution, and phase transformations, as illustrated in Fig. 4.
Specimen numbers 9, 10, 11, and 13, as shown in Figures 6 and 7, exhibited potentials up to -0.6 eV and possessed a more cathodic or passive region.
Specimen number 8 exhibited the lowest corrosion rate in Fig. 7, likely due to the improper selection of process parameters [7-8] Fig.7 Corrosion rate of four different tool profiles–Specimen 8, 9, 10, 13 Differential scanning calorimeter DSC, a widely used thermal analysis technique, is extensively applied in the field of precipitation-hardened aluminum alloys.
Only a limited number of specimens were tested to determine the presence or absence of precipitation formation or dissolution.
In the figures, 'a' refers to the standard specimen, while 'b' to 'q' represent specimen numbers 1 to 16, and 'r' represents the base metal.
Online since: April 2016
Authors: Antonia Cristina Barascu, Iulian Razvan Soare, Elena Loredana Terzea
Introduction In order to speak about progress, when comes of batch manufacturing, it is important to have the right techniques and to assure that the number of batches are correctly established and planned.
Measuring and managing the number of batches will lead to a better flow, less inventory and higher productivity [2].
The number of operators used in the painting process is 30 and in the assembly process is 15.
This does not permit to eliminate the low added-value operations such as alcohol degreasing, correction of burrs, scratches, curling. 9 7 The bumpers don’t come in batches from the supplier. 3 8 Loss of material due to repeated cleanings of bumpers (wipes + isopropyl alcohol). 2 Paint process related issue   9 Robotized painting process does not permit important modification, so it is necessary to work with batch production for each color. 1 10 Lack of synchronization between the information received at the exit of the painting process and the need in the assembling line. 4 11 The configuration of the conveyor route gives a large number of carriers/supports. 1 12 Large area occupied in the assembling proximity by bumpers packages. 1 13 Non-added value generated by the cutting pattern. 4 14 Heavy bars manipulation devices --> great effort for the operator. 1 15 Low fiability of the robots used for applying the varnish and the base for paint. 1 16 The partial un-masking operation has a low
Surface of the bumper without grain and cataphoresis; degreasing of the bumpers at the supplier.
Online since: September 2008
Authors: Eleonora Aneggi, Stefano Maschio, Erika Furlani
Due to such a wide range of applications, zirconia based materials have received a great deal of attention by researchers and a great number of papers is available on the subject, many of which dealing with the synthesis of zirconia powders and the production of zirconia monoliths and their properties.
On the other hand, the production of submicronic grain sized monoliths is impossible if the particles of the starting powders are not submicronic as well; secondly, if structural tools are to be produced, powders must possess a good sintering behaviour in order to minimize an undesired residual porosity.
During these critical preparation steps a great number of parameters, i.e. type of precursor (organic-inorganic), aspect (powder-solution), concentration, processing temperature and many others, must be carefully controlled.
A procedure that enables the reduction of such a great number of parameters making the production of powders with constant properties easier could be worthwhile.
Also in this measurement PSD is narrowed after 1h of milling; a longer milling time does not greatly improve the number of small particles.
Online since: February 2007
Authors: Masaru Ueno, Mikio Iwamoto, Giuseppe Pezzotti, Junji Ikeda
The earlier generation zirconia heads were not subjected to Hot-Isostatic-Press (HIP) treatment and the average grain size was approximately 0.3 µm.
Tetragonal Monoclinic Transformation c) Wave number (cm-1) Intensity (a.u.)
Tetragonal Monoclinic Transformation c) Wave number (cm-1) Intensity (a.u.)
a) b) 800 600 400 200 Tetragonal Monoclinic Transformation c) Wave number (cm-1) Intensity (a.u.)
a) b) 800 600 400 200Wave number (cm-1) Intensity (a.u.)
Online since: October 2012
Authors: Yong Zhou Cheng, Qing Feng Li, Yun Pan, Wen Cheng Wang
Effects of water wave on the sandy seabed have been investigated by a number of investigators.
The grain-size distribution obtained from the test is shown in Fig. 2.
The uppermost pore pressure sensor located at 4cm under bed surface in each section, pore pressure sensor number is P1, P2, P3, P4, and P5 from up to down on each section.
(1) The L is wavelength (m); T is wave period (s); k is wave number; D is water depth (m).
As shown in Fig. 9, the section number is #3.
Online since: August 2013
Authors: Dao Xiang Wu, Ren Bing Hua, Yuan Jie Yang, Li Li, Gong Zhang
The soil which localed above the containing water sand layer was gathered with a large number of carbonate or the calcium nodules under the effect of the ground water that rich in in long-term.
The soil is more inhomogeneity and anisotropism then the fine-grained soil because of the calcium nodules.
When there are calcareous concretions in soil, the standard penetration number is relatively high ,such as 4-48 blow in the Jieshou area.
But when there is little calcareous concretions, the number is relatively low, such as 6-15 blow.
Standard penetration number containing the calcareous concretions is 3-72 blow ,but 3-20 blow without the calcareous concretions.
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