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The 4H-SiC BJT wafer was grown in an Aixtron/Epigress VP508, a horizontal hot-wall chemical vapor deposition reactor using standard silane/propane chemistry and nitrogen and aluminum dopants.
The wafer was continuously grown using standard silane/propane chemistry and nitrogen and aluminum dopants in an Aixtron/Epigress VP508 horizontal hot-wall reactor [6]; the growth rate was ~2 µm⋅hr -1.
Ohmic contact evaluation from the on-chip transmission line model (TLM) structure.
Figure 3 shows results from the on-chip transmission line model (TLM) structure measurements.
The measured peak current gain of 33 is close to the theoretical limit of 39 for this wafer structure which is obtained by performing 2-D numerical simulations, assuming a maximum electron lifetime of 130 ns and a maximum hole lifetime of 26 ns [7].

Although the Tuha crude oil does not have high contents of wax, the wax contained in the crude has a special structure with double-peaked carbon distribution and very low branch degrees [1-2].
Oilfield Chemistry, 2 (1995): 113-116
Oilfield Chemistry, 2 (1995): 106-112
Oilfield Chemistry, 2 (1987): 146-155
Oilfield Chemistry, 4 (1999): 368-371

Anatase and rutile have a crystalline structure corresponding to the tetragonal system, while brookite has an orthorhombic crystalline structure [9, 10].
The anatase phase crystallizes in a tetragonal structure with lattice parameters a = b = 3.7760 Å and c = 9.4860 Å.
Brookite crystallizes in an orthorhombic structure with lattice parameters a = 9.1840 Å, b = 5.4470 Å, and c = 5.1450 Å.
This reduction in agglomeration can be attributed to the influence of noble metal dopants on surface chemistry and particle interactions.
This indicates effective crystal deformation resulting from the introduction of Ag/Au impurities into the lattice structure.

Nowadays, it is not evident to produce in a robust way cold rolled and annealed/galvanised high strength steels based on lean chemistries and with consistent mechanical properties over the coil length.
After rapid heating by means of induction heating and short holding at a high soaking temperature, the strip is cooled down to an intermediate temperature, where it is held for a short period for obtaining a stable ferrite-austenite structure.
However, this transformation cannot be achieved adequately unless the cooling rate is over a critical threshold, which depends on the steel chemistry.
These promising results allow opening the way for the development of new steels based on lean chemistries.
The production of cold rolled HSS based on lean chemistries with a good balance between strength and ductility can also be considered on a compact annealing line.

The most interesting feature in silicon carbide is the structure-property relation where the formation of different types of microstructure due to different structural modifications (polytypism) and grain-boundary/interfacial phase chemistry dictate the final properties of the monoliths.
Crystal structure, Polytypism and Phase transformation Silicon carbide occurs with many different crystal structures [l2,19].
Since the mechanical properties of SiC greatly depend on the structure and chemistry of grain boundary and intergranular phases, it is certainly essential to have a closer look into this.
The grain boundary structure and chemistry are quite different incase of ABC-SiC as compared to that of B,C-SiC.
Several authors studied the detailed structure of the grain boundary film in ABC-SiC and they found that the intergranular phases are rich in Al, O, C, and their thickness (depicted in fig. 9) and the degree of crystallinity depend on the concentration (also chemistry) of the additives and kinetic limitations of processing [51,73-77,80-83].

Introduction Structural reliability analysis has been used widely to assess the uncertainties in many engineering structures [1-3].
The probability of failure or reliability of a structure can be obtained by a probability approach [4-8].
[4] Bucher CG: Structural Safety, Vol.7 (1990), p. 57 [5] Rajashekhar M R, Ellingwood B R: Structural Safety, Vol.12 (1993), p.205 [6] Kim S, Na S: Structural Safety Vol.19(1997), p.3 [7] Das PK, Zheng Y: Probabilistic Engineering Mechanics, Vol.15 (2000), p.309 [8] Gayton N, Bourinet JM, Lemaire M: Structural safety, Vol.25 (2003), p.99 [9] Kaymaz I, McMahon CA: Probabilistic Engineering Mechanics, Vol.20 (2005), p.11 [10] Duprat F, Sellier A: Probabilistic Engineering Mechanics, Vol.21(2006), p.207 [11] Youn BD, Choi KK: Computers & Structures, Vol.82(2004), p.241 [12] Lancaster P, Salkauskas K: Mathematics of Computation, Vol.155(1981), p.141
[13] Breitkpf P, Naceur H, Rassineux A, Villon P: Computers & Structures, Vol.83(2005), p.1411 [14] Bucher CG, Most T: Probabilistic Engineering Mechanics, Vol.23(2008), p.154 [15] Ditlevsen O, Madsen HO: Structural reliability methods.
(Wiley, New York, 1981) [20] Melchers RE: Structural Safety, Vol.6(1989), p.3 [21] Au SK, Beck JL: Probabilistic Engineering Mechanics, Vol.16(2001), p.263 [22] Schueller GI, Pradlwarter HW: Probabilistic Engineering Mechanics, Vol.19( 2004), p.463 [23] Rabitz H, Alis OF, Shorter J: Computer Physics Communications, Vol.117(1999), p.11 [24] Rabitz H, Alis OF: Journal of Mathematical Chemistry, Vol.25(1999), p.197 [25] Alis OF, Rabitz H: Journal of Mathematical Chemistry, Vol.29(2001), p.127 [26] Li G, Rosenthal C, Rabitz H: Journal of Physical Chemistry, Vol.105(2001), p.7765 [27] Li G, Wang SW, Rabitz H: Journal of Mathematical Chemistry, Vol.30(2001), p.1 [28] Li G, Wang SW, Rabitz H: Chemical Engineering Science, Vol.57(2002), p.4445

In a pure system at room temperature, C3S is metastable and has a triclinic structure.
At rising temperature polymorphs show first a monoclinic and later rhombohedral structure.
Hewlett, Lea´s Chemistry of Cement and Concrete. 4nd edition, Butterworth-Heinemann, 2003 [2] H.F.
W Taylor, Cement chemistry. 2nd edition, Thomas Telford Publishing, London, 1997
Kaušanskij, Solid solutions in cement chemistry, Zurnal prikladnoj chimii, Part 2, (1984) [4] P.E.

Such structures result from the shape complementarities recognition between aptamer and target molecules which via van der waals force, electrostatic interaction, hydrogen bond interaction and shape matching etc.
Aptamers have obvious advantages in analytical and clinical chemistry, including strong bonding force, high specificity, easy synthesis in vitro, high stability, structural flexibility and the mild reaction conditions.
Therefore, aptamers have been widely used in analytical chemistry, clinical diagnosis and drug research.
Nanoparticles have been widely applied in analytical chemistry due to the small size effect, quantum effect and macroscopic quantum tunneling effect.
The complex interacted with Hg2+ to form stable hairpin structure with T- Hg2+-T mismatches, which resulted in the adsorption of another end of aptamer on the shell of NGs.

The TEM images show a fully disordered wormlike structure similar to all other TUD-1 materials [3].
Analytical Chemistry. 1955, 27(2): 175-185
Chemistry-A European Journal. 2006, 12(2): 620-628
Journal of Materials Chemistry. 2010, 20(4): 642-658
Chemistry-A European Journal. 2001, 7(7): 1437-1443

The structure of copolymer was characterized by ATR-FTIR.
Characterization The structure of dispersant was determined by Attenuated total Reflection Fourier transform infrared spectroscopy (ATR-FTIR) within 400-4000cm-1.
Fig.1 are IR spectrum of non-modified and modified humic acid.IR spectrum of non-modified sample shows that the C=O stretching vibration peak at 1638 cm-1, the aromatic structure of the conjugated double bonds C=C stretching vibration peak at 1561 cm-1.
Journal of Fuel Chemistry and Technology(in Chinese) Vol. 28(2005) 42-46 [2] M.S.Zhou, X.Q.Qiu, W.Q.
Journal of Fuel Chemistry and Technology(in Chinese) Vol. 25(1997)213-217 [4] Schnitzer, M.Khan,S.U.