Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: May 2004
Authors: E. Kula
Based upon this information, one might suppose that limited number of forms can be made between
the sylinder and sphere, considering the limits of formation of the potter's wheel.
In the first phase 10%-20% bazalt grains are mixed in the clay and kneaded; the piece is then centralized on the potters wheel, a cone-shaped and tall sylinder is formed.
In the first phase 10%-20% bazalt grains are mixed in the clay and kneaded; the piece is then centralized on the potters wheel, a cone-shaped and tall sylinder is formed.
Online since: October 2014
Authors: Xiang Yang Bian, Xiao Juan Mao
Cemetery of Geometric Pattern Unearthed Woolen Fabric from Xinjiang
S/N
Region
Cemetery
1
Lop Nur Area of Bayingolin Mongolian Autonomous Prefecture
Gumugou Burial Ground of Kongque River, Xiaohe Cemetery, Ancient Loulan Tombs,Yingpan Burial Ground
2
Hami
Wubao Cemetery, Aiskexiaer Cemetery, Yanblak Cemetery in Hami
3
The Southwestern Tarim Basin
No.2 period of Zhagunluke Cemetery, Northern Cemetery
4
The Southern Foot of the middle of Xinjiang’s
Tianshan Mountain Range
Ancient Chawuhugou Cemetery in Hejing County
5
Turpan
Ancient Subeixi Cemetery in Shanshan County, Ancient Yanghai Cemetery in Shanshan County,Ancient Alagou Cemetery
6
Kashgar
Tuokuzisalai Site
7
Hotan
Niya Site in Minfeng County, Ancient Shanpula Cemetery, Ancient Site of Keriya, Ancient Bujak Cemetery
Types of Geometric Pattern Unearthed Woolen Fabric from Xinjiang
The unearthed geometric patterns mainly include triangle grain, ling plaid, checkered, stripes and connection lines.
Table.2.The Types of Geometric Patterns of Unearthed Woolen Fabric S/N Composition Name of the Patterns Real Photos Isography and Restored Images 1 One Geometric Pattern Triangle pattern Diamond lattice patterns Check pattern Stripe Zigzag pattern 2 Two Types of Geometric Patterns Triangular lozenge Rhombic cross pattern Stars and stripes Zigzag and Hook pattern Check pattern 3 Two or more Geometrical Patterns Reticulate -striate 4 Geometric Patterns and Figurative Patterns Diamond lattice and four petal flower patterns The Connection between Geometric Patterns of Unearthed Potteries and Unearthed Woolen Fabric’s A large number of potteries with exquisite geometric patterns were also found in the ruins of ancient tombs of Xinjiang.
Table.2.The Types of Geometric Patterns of Unearthed Woolen Fabric S/N Composition Name of the Patterns Real Photos Isography and Restored Images 1 One Geometric Pattern Triangle pattern Diamond lattice patterns Check pattern Stripe Zigzag pattern 2 Two Types of Geometric Patterns Triangular lozenge Rhombic cross pattern Stars and stripes Zigzag and Hook pattern Check pattern 3 Two or more Geometrical Patterns Reticulate -striate 4 Geometric Patterns and Figurative Patterns Diamond lattice and four petal flower patterns The Connection between Geometric Patterns of Unearthed Potteries and Unearthed Woolen Fabric’s A large number of potteries with exquisite geometric patterns were also found in the ruins of ancient tombs of Xinjiang.
Online since: June 2023
Authors: Letícia Andreolli Dias, Lucas Kaefer, Alice Helena Meinhart, Daiana Cristina Metz Arnold, Alexandre Silva Vargas, Fernando dal Pont Morisso, Claudia Trindade Oliveira
The characteristics of reactive aggregates such as particle size distribution, grain size and shape also impact the expansive effect [10].
Characteristics such as dimensions, grain shape, texture, alterations, and deformations of the rock can indicate its susceptibility to chemical reactions. 3.1.1 Basalt aggregate sample.
On the other hand, quartz occurs in the form of relatively small interstitial grains.
It is composed of several grains of the same mineral species, with no significant variation regarding the size of the fragments.
The number of internal pores in the limestone sample presented a significant decrease, which is explained in the study of Nagrockienė and Rutkauskas [14], where it was found that the use of mineral additions, among them CV, makes the structure less porous and consequently hinders the accommodation and percolation of the gel.
Characteristics such as dimensions, grain shape, texture, alterations, and deformations of the rock can indicate its susceptibility to chemical reactions. 3.1.1 Basalt aggregate sample.
On the other hand, quartz occurs in the form of relatively small interstitial grains.
It is composed of several grains of the same mineral species, with no significant variation regarding the size of the fragments.
The number of internal pores in the limestone sample presented a significant decrease, which is explained in the study of Nagrockienė and Rutkauskas [14], where it was found that the use of mineral additions, among them CV, makes the structure less porous and consequently hinders the accommodation and percolation of the gel.
Online since: July 2010
Authors: Grégory Guisbiers
(11)
Where 1z is the first nearest-neighbor atoms. 1vz is the number of first nearest atoms above the
same plane (vertical direction). vapH is the difference between the vaporization enthalpies of the
two pure elements,
AB
vap v v
H H H
. subH is the difference between the sublimation
enthalpies of the two pure elements,
AB
sub s s
H H H
.
There are four types of diffusion: surface, grain boundary, dislocations and lattice (bulk) [27-29].
Assuming no size and shape effects on 0,D , the diffusion coefficient at the nanoscale can be evaluated by [30]: , 1 0,, shape mCT RT D D L T D e (16) The creep can begin when the grain boundaries can move over distances of the order of the grain size by diffusion processes.
The rate of diffusion along the grain boundaries is limited by the emission and absorption of atoms at grain boundaries.
This process needs energy to emit and absorb atoms at grain boundaries resulting in a threshold stress.
There are four types of diffusion: surface, grain boundary, dislocations and lattice (bulk) [27-29].
Assuming no size and shape effects on 0,D , the diffusion coefficient at the nanoscale can be evaluated by [30]: , 1 0,, shape mCT RT D D L T D e (16) The creep can begin when the grain boundaries can move over distances of the order of the grain size by diffusion processes.
The rate of diffusion along the grain boundaries is limited by the emission and absorption of atoms at grain boundaries.
This process needs energy to emit and absorb atoms at grain boundaries resulting in a threshold stress.
Online since: September 2014
Authors: John Meech, Sepehr Sadrai, Bahador Mousavi Zadeh
Generally, it may take a number of impacts before a force sufficient to propagate a fracture, is applied.
Rock can break in one of three ways: by splitting apart inherent flaws – cracks, grain boundaries, dislocations; by fracturing across a grain (inherent rock strength); and by attrition in which fine particles are ripped from the bulk material.
This S.S.A. is about 100 times more than one would expect for spherical magnetite grains of 1.5 mm in diameter.
At low velocities, the primary mode of failure is crack propagation along grain boundaries or within grains.
For flotation, grain-boundary and crack propagation is preferred while for leaching, attrition may be preferred.
Rock can break in one of three ways: by splitting apart inherent flaws – cracks, grain boundaries, dislocations; by fracturing across a grain (inherent rock strength); and by attrition in which fine particles are ripped from the bulk material.
This S.S.A. is about 100 times more than one would expect for spherical magnetite grains of 1.5 mm in diameter.
At low velocities, the primary mode of failure is crack propagation along grain boundaries or within grains.
For flotation, grain-boundary and crack propagation is preferred while for leaching, attrition may be preferred.
Online since: October 2006
Authors: Joan M. Redwing, Qi Li, Pasquale Orgiani, Y. Cui, J. Chen, V. Ferrando, A.V. Pogrebnyakov, X.X. Xi
On the contrary, MgB2 films deposited with higher
B2H6 gas mixture flow rates generally have larger grain sizes than those grown with lower flow
rates.
Films deposited with 25-sccm B2H6 gas mixture flow are smooth with the rms roughness of 25-40 Å and grain sizes about 0.1-0.2mm.
MgB2 films with the thickness up to 2000 Å grown at higher B2H6 gas mixture flow rates are also smooth, but with larger grain sizes.
Structurally, the doped films are textured with columnar nano-grains and highly resistive amorphous areas at the grain boundaries.
The thickness and the number of depositions for each fiber is also reported MgB2-based heterostructures We report structural and transport proprieties of MgB2/MgO and MgB2/AlN multilayers for MgB2 Josephson junctions.
Films deposited with 25-sccm B2H6 gas mixture flow are smooth with the rms roughness of 25-40 Å and grain sizes about 0.1-0.2mm.
MgB2 films with the thickness up to 2000 Å grown at higher B2H6 gas mixture flow rates are also smooth, but with larger grain sizes.
Structurally, the doped films are textured with columnar nano-grains and highly resistive amorphous areas at the grain boundaries.
The thickness and the number of depositions for each fiber is also reported MgB2-based heterostructures We report structural and transport proprieties of MgB2/MgO and MgB2/AlN multilayers for MgB2 Josephson junctions.
Online since: July 2011
Authors: Fei Li, Xia Zhao
The σN is the number of atomic configuration (satisfies ΔDα<0.005 nm), which is possibly existed in one cell or structure unit.
The σ is the number of atomic configuration in the phase interface.
Its single-bond radius and covalent electron number are relatived to the weighting average values of the corresponding parameters for atoms in the solid solution, i.e., (4) Where the R(1) represents the single-bond radius, m the atomic percentage of Cu or Zn atom, and nc the covalent electron number of the atom.
DA a X atom Fig. 2 (111) Lattice plane of X cell On the X cell lattice plane (111), the covalent electron total numbers is =IA=12, where the can be calculated by the BLD method.
The calculated results show that effects of alloying element Zn on interface strengthening in the Cu-Zn solid solution can be explained reasonably with Δρ′{TTP}8242 and σ; obviously, the stability of homophase interface is superior to that of heterophase interface in the grain due to the difference of the σ, which accords with the experiment.
The σ is the number of atomic configuration in the phase interface.
Its single-bond radius and covalent electron number are relatived to the weighting average values of the corresponding parameters for atoms in the solid solution, i.e., (4) Where the R(1) represents the single-bond radius, m the atomic percentage of Cu or Zn atom, and nc the covalent electron number of the atom.
DA a X atom Fig. 2 (111) Lattice plane of X cell On the X cell lattice plane (111), the covalent electron total numbers is =IA=12, where the can be calculated by the BLD method.
The calculated results show that effects of alloying element Zn on interface strengthening in the Cu-Zn solid solution can be explained reasonably with Δρ′{TTP}8242 and σ; obviously, the stability of homophase interface is superior to that of heterophase interface in the grain due to the difference of the σ, which accords with the experiment.
Online since: May 2020
Authors: Yong Qiang Du, Jian Zheng, Jun Hui Yin
Figure 2: The curves of maximum stress with total number of cycles for HTPB coating with different elongations.
Figure 3: The curves of maximum stress with total number of cycles of HTPB coating at different tensile rates.
It can be concluded that the maximum stress of HTPB coating decreased with the increase of the total number of cycles during cyclic tension, which indicated that stress relaxation has occurred.
With the increase of the total number of cycles, the internal stress will decrease [11].
Du, et al.: Stress analysis of propellant grain loaded in composite case motor under vertical storage, J.
Figure 3: The curves of maximum stress with total number of cycles of HTPB coating at different tensile rates.
It can be concluded that the maximum stress of HTPB coating decreased with the increase of the total number of cycles during cyclic tension, which indicated that stress relaxation has occurred.
With the increase of the total number of cycles, the internal stress will decrease [11].
Du, et al.: Stress analysis of propellant grain loaded in composite case motor under vertical storage, J.
Online since: February 2013
Authors: Yi Hong Luo, Shu Guang Zhang
In the model that neglects the immigration, the number of labor intensive is and the high-tech intensive is .
The sale price of grain is and the purchase price is .
The utility function of the whole city is .Where are constant and .Therefore, Substitute and into Kolmogorov's forward equation Eq. 3: We obtain that: Solve the Eq. 4, we obtain Eq. 5: Define that is the number of labor intensive immigrant, and is the number of high-tech intensive immigrant.
Suppose that the number of labor intensive in the age interval mentioned above is , and the number of high-tech intensive is at time t.
If we allow for a new industry named service and the number of it is .
The sale price of grain is and the purchase price is .
The utility function of the whole city is .Where are constant and .Therefore, Substitute and into Kolmogorov's forward equation Eq. 3: We obtain that: Solve the Eq. 4, we obtain Eq. 5: Define that is the number of labor intensive immigrant, and is the number of high-tech intensive immigrant.
Suppose that the number of labor intensive in the age interval mentioned above is , and the number of high-tech intensive is at time t.
If we allow for a new industry named service and the number of it is .
Online since: September 2013
Authors: Ci Yun Chen, Qi Cheng Feng, He Fei Zhao, Shu Ming Wen
Comprehensive Utilization Status of Low Grade and Refractory Platinum-palladium Ores from Jinbaoshan of Yunnan
Ciyun Chen1, a, Shuming Wen1, b, Qicheng Feng1, c, Hefei Zhao1, d
1Faculty of Land Resource Engineering, Kunming University of Science and Technology,
Kunming 650093, Yunnan, China
accykmust@126.com, bshmwen@126.com, cfqckmust@126.com, dneimengzhaohefei@126.com
Keywords: Platinum-palladium ores; Single process; Combined process; Comprehensive Utilization
Abstract: It is difficult to handle platinum-palladium ores in Jinbaoshan due to low grade ores, kinds of mineral resources, complex mineral structure, fine-grained dissemination, which is a typical refractory complex ores.
Due to the present situation of platinum-palladium mineral resources in our country, inevitably lead to the demand gap of platinum group metals in domestic industry is bigger, make our country a large number of platinum group metals need to be imported from abroad.
The grain size of the PGE minerals in the process and each graded of PGE mineral content is as follows: 32~16 um, 14.6%; 16 ~8um, 32.9%; 8~4 um, 21.9%; 4~2um, 20.1%; 2~1um,9.1%; -1 um, 1.3%.
Nearly half of the PGE minerals distributed in the range of grain -8um [13-14]. 2.3 Minerals composition is complex in the ore Jinbaoshan Platinum-palladium mine deposit is China's largest independent PGM deposits, the platinum and palladium minerals composition and structure are complex in this deposit, more than 90 species minerals are known in this ore, of which precious metal minerals, metallic minerals and non-metallic minerals all have many types [15] and each minerals content in the ore have a larger difference, according to "The study of the typical deposits of Midu County of Yunnan Jin Bao shan platinum-palladium ore ", we can known that the gangue minerals are main minerals in the ore, which content up to 84.7%, while the gangue minerals dominated by serpentine, and its proportion is large in the ore, accounting for the total amount of ore 3/4.
The main mineral in this ore deposit and its relative content is: chalcopyrite 0.376%; violarite and pentlandite 0.382%; pyrite 0.706%; magnetite and chromite 10.972%; goethite 0.014 %; gangue minerals 84.700% [16-19]. 2.3.1 The gangue minerals The mineral components of Jin Baoshan platinum-palladium ore are complex, the predecessors have done a lot of process mineralogy research to this ore, the gangue mineral composition simpler than other mineral in the ore, the main gangue mineral is serpentine, relatively small number of gangue minerals are hornblende, carbonate gangue minerals, pyroxene, chlorite and biotite gangue minerals , etc.
Due to the present situation of platinum-palladium mineral resources in our country, inevitably lead to the demand gap of platinum group metals in domestic industry is bigger, make our country a large number of platinum group metals need to be imported from abroad.
The grain size of the PGE minerals in the process and each graded of PGE mineral content is as follows: 32~16 um, 14.6%; 16 ~8um, 32.9%; 8~4 um, 21.9%; 4~2um, 20.1%; 2~1um,9.1%; -1 um, 1.3%.
Nearly half of the PGE minerals distributed in the range of grain -8um [13-14]. 2.3 Minerals composition is complex in the ore Jinbaoshan Platinum-palladium mine deposit is China's largest independent PGM deposits, the platinum and palladium minerals composition and structure are complex in this deposit, more than 90 species minerals are known in this ore, of which precious metal minerals, metallic minerals and non-metallic minerals all have many types [15] and each minerals content in the ore have a larger difference, according to "The study of the typical deposits of Midu County of Yunnan Jin Bao shan platinum-palladium ore ", we can known that the gangue minerals are main minerals in the ore, which content up to 84.7%, while the gangue minerals dominated by serpentine, and its proportion is large in the ore, accounting for the total amount of ore 3/4.
The main mineral in this ore deposit and its relative content is: chalcopyrite 0.376%; violarite and pentlandite 0.382%; pyrite 0.706%; magnetite and chromite 10.972%; goethite 0.014 %; gangue minerals 84.700% [16-19]. 2.3.1 The gangue minerals The mineral components of Jin Baoshan platinum-palladium ore are complex, the predecessors have done a lot of process mineralogy research to this ore, the gangue mineral composition simpler than other mineral in the ore, the main gangue mineral is serpentine, relatively small number of gangue minerals are hornblende, carbonate gangue minerals, pyroxene, chlorite and biotite gangue minerals , etc.