Effect of Heating Treatment on the Resistivity of Polycrystalline Silicon

2011 ◽  
Vol 675-677 ◽  
pp. 113-116
Author(s):  
Lei Zhang ◽  
Jia Yan Li ◽  
Hao Yang Wang ◽  
Fu Min Xu ◽  
Yi Tan
Keyword(s):  
Heat Treatment ◽  
Polycrystalline Silicon ◽  
Influence Factors ◽  
The Other ◽  
Type Region ◽  
Obvious Change ◽  
Other Hand ◽  
Heating Treatment ◽  
P Type

Effect of heat treatment in atmosphere on the resistivity of polycrystalline silicon has been investigated in this paper. After heat treatment at 1050oC for 10h, there is no obvious change of the resistivity in the N-type region of polycrystalline silicon, which could be contributed to the complicated influence factors, such as more impurities content and defects. On the other hand, an obvious increase of the resistivity was observed in the P-type region which could be contributed the redistribution of Al and B in the Si-SiO2 interface. The resistivity of the P-type region increased from less than 1Ω·cm to several hundreds Ω·cm.

Trypanosoma cruzi Epimastigotes Express the Ouabain-and Vanadate-Sensitive (Na++K+)ATPase Activity

1998 ◽  
Vol 53 (11-12) ◽  
pp. 1049-1054 ◽  
Author(s):  
Celso Caruso-Neves ◽  
Marcelo Einicker-Lamas ◽  
Carlos Chagas ◽  
Mecia Maria Oliveira ◽  
Adalberto Vieyra ◽  
...  
Keyword(s):  
Trypanosoma Cruzi ◽  
Atpase Activity ◽  
The Other ◽  
Other Hand ◽  
P Type

Abstract The presence of (Na++K+)ATPase activity in CL14 clone and NIH NTY strain of Trypano­soma cruzi epimastigotes is demonstrated. A Na+ plus K+ stimulated ATPase activity is found in both strains. The optimal Na+/K+ ratio is 5:1 and 9:1 in CL14 clone and NIH NTY strain, respectively. In both strains, vanadate completely inhibits the ouabain-sensitive ATPase activ­ity indicating that it belongs to the P-type (E 1/E2) family of ion-transporting ATPases. The I50 for vanadate is 0.66 ± 0.04 and 0.04 ± 0.02 μᴍ in CL14 clone and NIH NTY strain, respectively. These data indicate that both strains of T. cruzi epimastigotes express the oua­ bain-and vanadate-sensitive (Na++K+)ATPase activity. On the other hand, the discrepancy between the parameters analyzed for the inhibitors suggests that they express different iso­ forms of this enzyme.

scholarly journals Accelerated sliding of pollen tube organelles along Characeae actin bundles regulated by Ca2+.

1988 ◽  
Vol 106 (5) ◽  
pp. 1539-1543 ◽  
Author(s):  
T Kohno ◽  
T Shimmen
Keyword(s):  
Heat Treatment ◽  
Pollen Tube ◽  
Cytoplasmic Streaming ◽  
Pollen Tubes ◽  
The Other ◽  
Cell Models ◽  
Organelle Movement ◽  
Actin Bundles ◽  
Other Hand ◽  
Order Of Magnitude

Pollen tubes show active cytoplasmic streaming. We isolated organelles from pollen tubes and tested their ability to slide along actin bundles in characean cell models. Here, we show that sliding of organelles was ATP-dependent and that motility was lost after N-ethylmaleimide or heat treatment of organelles. On the other hand, cytoplasmic streaming in pollen tube was inhibited by either N-ethylmaleimide or heat treatment. These results strongly indicate that cytoplasmic streaming in pollen tubes is supported by the "actomyosin"-ATP system. The velocity of organelle movement along characean actin bundles was much higher than that of the native streaming in pollen tubes. We suggested that pollen tube "myosin" has a capacity to move at a velocity of the same order of magnitude as that of characean myosin. Moreover, the motility was high at Ca2+ concentrations lower than 0.18 microM (pCa 6.8) but was inhibited at concentration higher than 4.5 microM (pCa 5.4). In conclusion, cytoplasmic streaming in pollen tubes is suggested to be regulated by Ca2+ through "myosin" inactivation.

Modeling of the Diffusion of Hydrogen in Silicon

1989 ◽  
Vol 163 ◽  
Author(s):  
D. Mathiot ◽  
D. Ballutaud ◽  
P. De Mierry ◽  
M. Aucouturier
Keyword(s):  
High Temperature ◽  
Boron Concentration ◽  
Temperature Data ◽  
The Other ◽  
Systematic Variation ◽  
Hydrogen Trapping ◽  
Other Hand ◽  
High Temperature Data ◽  
P Type ◽  
Diffusion Of Hydrogen

AbstractA model is proposed to describe hydrogen motion in silicon near 150°C. This model leads to a consistent view of H° behaviour in low doped n and p-type Si, with a diffusivity in agreement with the high temperature data. On the other hand, a systematic variation of DH+ with the boron concentration forces us to conclude that some still unknown interactions take place and contribute to hydrogen trapping in highly doped p-Si.

Proposal and Fabrication of a Temperature-Field Stage with an NN-Type Peltier Device

2011 ◽  
Vol 254 ◽  
pp. 183-186 ◽  
Author(s):  
Nobuyuki Suzuki ◽  
Hideyuki Homma ◽  
Shigeo Yamaguchi
Keyword(s):  
Temperature Field ◽  
Thermoelectric Materials ◽  
The Other ◽  
Current Dependence ◽  
Other Hand ◽  
Peltier Device ◽  
P Type

We have proposed and fabricated a NN-type Peltier device. The conventional Peltier devices have a structure called π-shaped, which is required to have both P-type and N-type thermoelectric materials. On the other hand, our NN-type Peltier device proposed here is only composed of N-type (or P-type) thermoelectric materials. In this study, we fabricated an NN-type Peltier device with a T-shaped stage, and the current dependence of the stage temperature was measured both for cooling and heating.

Effect of Sandblasting and Heat Treatment on Biaxial Flexure Strength of the Zirconia/Alumina Nanocomposite

2007 ◽  
Vol 330-332 ◽  
pp. 353-356 ◽  
Author(s):  
Seiji Ban ◽  
Hideo Sato ◽  
Y. Suehiro ◽  
H. Nakanishi ◽  
Masahiro Nawa
Keyword(s):  
Heat Treatment ◽  
Cerium Oxide ◽  
Tetragonal Zirconia ◽  
The Other ◽  
Alumina Powder ◽  
Monoclinic Zro2 ◽  
Flexure Strength ◽  
Other Hand ◽  
Biaxial Flexure

The effect of sandblasting and heat treatment on biaxial flexure strengths of the zirconia/alumina nanocomposite stabilized with cerium oxide (Ce-TZP/Al2O3 nanocomposite) was evaluated in comparison to that of yttria stabilized tetragonal zirconia polycrystals (Y-TZP). The disc-shaped specimens of the nanocomposite and Y-TZP were sandblasted with 70)m alumina powder. After sandblasting, half of the specimens were heated at 1000°C for 5 min. The biaxial flexure strengths of Y-TZP were independent on the sandblasting, but decreased with the heat treatment. On the other hand, the biaxial flexure strength of the nanocomposite increased with the sandblasting and significantly decreased with the heat treatment. The content of monoclinic ZrO2 of Y-TZP and the nanocomposite increased with the sandblasting pressure and dramatically decreased with the heat treatment. These results suggest that the stress-induced transformation from tetragonal to monoclinic of the nanocomposite occurs more easily than Y-TZP.

scholarly journals Characterization of human heterophil hemolysins induced by Schistosoma mansoni infection

1983 ◽  
Vol 78 (3) ◽  
pp. 257-267 ◽  
Author(s):  
Munir Chamone ◽  
L. Alves Oliveira ◽  
P. M. Z. Coelho ◽  
G. Gazzinelli ◽  
A. Oliveira Lima ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Schistosoma Mansoni ◽  
Hemolytic Activity ◽  
Gel Filtration ◽  
The Other ◽  
Other Hand ◽  
Classic Pathway

Heterophil antibodies could be detected in sera from normal or from patient with chronic schistosomiasis. Their hemolytic activities depend on the integrity of the complement classic pathway. The heterophil antibodies from patient sera presented a higher specificity for Schistosoma mansoni antigen preparations than those detected in normal sera. Most of the hemolytic activity observed in normal sera can be destroyed at 56ºC for 4 min. On the other hand, about 80% of the sera from infected patients are partially or totally resistant to this heat-treatment. The hemolytic activities of sera were eluted from a gel filtration column in different fractions of the first peak.

Transformation and Precipitation Behavior in the New Conceptual TMCP Process Utilizing Heat Treatment On-Line Process

2007 ◽  
Vol 539-543 ◽  
pp. 4732-4737
Author(s):  
T. Shinmiya ◽  
Nobuyuki Ishikawa ◽  
S. Endo ◽  
M. Okatsu ◽  
Haruo Nakamichi
Keyword(s):  
Heat Treatment ◽  
Bainitic Ferrite ◽  
The Other ◽  
Accelerated Cooling ◽  
Second Phase ◽  
Air Cooling ◽  
Precipitation Behavior ◽  
Other Hand ◽  
On Line ◽  
Untransformed Austenite

New conceptual TMCP process for manufacturing high strength steel plates, which is applied an on-line heat treatment immediately after accelerated cooling (ACC), was developed. Transformation and precipitation behavior in the new TMCP process was investigated and compared with those in conventional ACC process and quenching and tempering process (Q+T). In the ACC process and Q+T process, microstructures were consisted of bainitic ferrite and second phase, such as cementite or martensite-austenite constituent (MA). And fine carbides, which were formed randomly, were observed in Q+T steel. On the other hand, in the new TMCP process polygonal ferrite was observed in addition to bainitic ferrite and cementite, and two kinds of precipitation forms, random precipitation and row precipitation, were observed. It was found that ferrite transformation is promoted during heating after accelerated cooling, which brings row precipitation of fine carbides. Furthermore, Control of the formation of MA this new TMCP process. In the conventional ACC process, MA constituents are formed from carbon enriched untransformed austenite during air cooling after ACC, and formation of MA is hard to prevent for higher strength steels. On the other hand, carbon enrichment to untransformed austenite can be prevented by carbide formation during on-line heat treatment after ACC. It was demonstrated that homogeneous microstructure with very low amount of MA constituents was achieved by the new TMCP process. And, absence of brittle phase brought excellent resistance to hydrogen induced cracking in NACE sour environment. In this paper, details of the metallurgical and mechanical feature of this new TMCP steel were discussed, and application to sour resistant linepipe steel was introduced.

Effects of Metal Buffer Layer on the Epitaxial Growth of YBa2Cu3O7-y. Superconducting Films by Dipping-Pyrolysis Process

1995 ◽  
Vol 401 ◽  
Author(s):  
T. Manabe ◽  
I. Yamaguchi ◽  
S. Nakamura ◽  
W. Kondo ◽  
S. Mizuta ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Epitaxial Growth ◽  
Buffer Layer ◽  
Annealing Temperature ◽  
Superconducting Films ◽  
The Other ◽  
Pyrolysis Process ◽  
Ybco Films ◽  
Other Hand ◽  
Metal Layers

AbstractSuperconducting Yba2Cu3O7 -x(YBCO) films were prepared by dipping-pyrolysis process on SrTiO3 (001) or on MgO (001) substrates covered with a metal (Au or Ag) buffer layer, and the effects of these metal layers on the growth of YBCO films were investigated. Epitaxial growth of YBCO was found to be suppressed by the Au buffer layer, which crystallized to exhibit (111) orientation, after heat treatment at 700°C and higher. On the other hand, epitaxial YBCO films were obtained starting with Ag buffer layer by heat treatment at 700°C and higher, after which most of Ag was accumulated to particles. It was also found that the annealing temperature required for the epitaxial growth of YBCO films on MgO was lowered to 850°C by adopting the Ag buffer layer.

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

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