1,221 research outputs found
Thermal stability study of AlGaN/GaN MOS-HEMTs using Gd2O3 as gate dielectric
Thermal stability of AlGaN/GaN MOS-HEMTs and -diodes using Gd_(2)O_(3) are investigated by means of different thermal cycles and storage tests up to 500ΒΊC for one week. IV DC and pulsed characteristics of the devices before and after the processes are evaluated and compared with conventional HEMTs. Results show that the devices with Gd_(2)O_(3) dielectric layer have lower leakage current and a more stable behavior during thermal treatment processes compared with conventional devices. In fact, an excellent on/off ratio of about 108 and a stable V_(t) is observed after storage at high temperature. The beneficial effects of Gd_(2)O_(3) on trapping effects of MOS-HEMTs are also dis-cussed
Π Π°Π·Π²ΠΈΡΠΈΠ΅ ΡΠΈΡΡΠ΅ΠΌΡ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠ΅ΡΡΠΎΠ½Π°Π»Π° ΠΊΠ°ΠΊ ΡΠ΅Ρ Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΊΠ°Π΄ΡΠΎΠ²ΠΎΠ³ΠΎ ΠΌΠ΅Π½Π΅Π΄ΠΆΠΌΠ΅Π½ΡΠ° Π² ΠΊΠΈΡΠ°ΠΉΡΠΊΠΈΡ ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΡΡ
In the present article is explained the role of personnel evaluation in the companies of PRC (as: shortage of the qualified experts, responsible for the stuff-evaluation; non-structural evaluation procedure; existence of unprompted evaluation procedures; absence of feed-back from the evaluated staff; drawbacks in the practical employing of foreign methods by the Chinese head executives. The specific recommendations are given on effective development of the personnel evaluation system for HR technology in the Chinese companies: increasing in professionalism of the estimators; accurate planning of the estimation procedure; asking for feed-back from the evaluated staff; extension of evaluation methods (from traditional interview to complex and elaborated methods of personnel evaluation); providing transparency of evaluation procedures (let each member of the staff be aware of the rules, results and consequences of the evaluation); introduction of the foreign evaluation methods and technologies and their proper adaptation to the specific national environment.Π ΡΡΠ°ΡΡΠ΅ Π²ΡΡΠ²Π»Π΅Π½Π° ΡΠΎΠ»Ρ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠ΅ΡΡΠΎΠ½Π°Π»Π° Π² ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
ΠΊΠΈΡΠ°ΠΉΡΠΊΠΈΡ
ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΡΡ
, ΡΠ°ΡΠΊΡΡΡΡ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ Π² ΠΎΡΠ΅Π½ΠΊΠ΅ ΠΏΠ΅ΡΡΠΎΠ½Π°Π»Π° Π² ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΡΡ
ΠΠΠ (Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΎΠΊ ΠΊΠ²Π°Π»ΠΈΡΠΈΡΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
ΠΊΠ°Π΄ΡΠΎΠ², ΠΏΡΠΎΠ²ΠΎΠ΄ΡΡΠΈΡ
ΠΏΡΠΎΡΠ΅Π΄ΡΡΡ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠ΅ΡΡΠΎΠ½Π°Π»Π°; Π½Π΅ΡΡΡΡΠΊΡΡΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΡΡΡ ΠΏΡΠΎΡΠ΅Π΄ΡΡ ΠΎΡΠ΅Π½ΠΊΠΈ; ΡΠΏΠΎΠ½ΡΠ°Π½Π½ΠΎΡΡΡ ΠΎΡΠ΅Π½ΠΎΡΠ½ΡΡ
ΠΏΡΠΎΡΠ΅Π΄ΡΡ; ΠΎΡΡΡΡΡΡΠ²ΠΈΠ΅ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠΉ ΡΠ²ΡΠ·ΠΈ Ρ ΠΎΡΠ΅Π½ΠΈΠ²Π°Π΅ΠΌΡΠΌΠΈ; Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΎΠΊ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ ΠΊΠΈΡΠ°ΠΉΡΠΊΠΈΡ
ΡΡΠΊΠΎΠ²ΠΎΠ΄ΠΈΡΠ΅Π»Π΅ΠΉ Π·Π°ΡΡΠ±Π΅ΠΆΠ½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊ). ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Ρ ΠΊΠΎΠ½ΠΊΡΠ΅ΡΠ½ΡΠ΅ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄Π°ΡΠΈΠΈ ΠΏΠΎ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠΌΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΠΈΡΡΠ΅ΠΌΡ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠ΅ΡΡΠΎΠ½Π°Π»Π° ΠΊΠ°ΠΊ ΠΊΠ°Π΄ΡΠΎΠ²ΠΎΠΉ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ Π² ΠΊΠΈΡΠ°ΠΉΡΠΊΠΈΡ
ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΡΡ
: ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΠ΅ ΠΏΡΠΎΡΠ΅ΡΡΠΈΠΎΠ½Π°Π»ΠΈΠ·ΠΌΠ° Π»ΡΠ΄Π΅ΠΉ, Π·Π°Π½ΠΈΠΌΠ°ΡΡΠΈΡ
ΡΡ ΠΎΡΠ΅Π½ΠΊΠΎΠΉ; ΡΡΠ°ΡΠ΅Π»ΡΠ½ΠΎΠ΅ ΠΏΠ»Π°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΡΠΎΡΠ΅Π΄ΡΡΡ ΠΎΡΠ΅Π½ΠΊΠΈ; ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ ΠΎΠΏΡΠΎΡΠΎΠ² ΠΎ ΡΠΈΡΡΠ΅ΠΌΠ΅ ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠ΅ΡΡΠΎΠ½Π°Π»Π° ΠΈ ΡΠ΄ΠΎΠ²Π»Π΅ΡΠ²ΠΎΡΠ΅Π½Π½ΠΎΡΡΠΈ Π΅ΠΉ ΡΠΎ ΡΡΠΎΡΠΎΠ½Ρ ΡΠΎΡΡΡΠ΄Π½ΠΈΠΊΠΎΠ²; ΡΠ°ΡΡΠΈΡΠ΅Π½ΠΈΠ΅ Π½Π°Π±ΠΎΡΠ° ΠΎΡΠ΅Π½ΠΎΡΠ½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊ (ΠΎΡ ΡΡΠ°Π΄ΠΈΡΠΈΠΎΠ½Π½ΡΡ
ΠΈΠ½ΡΠ΅ΡΠ²ΡΡ Π΄ΠΎ Π±ΠΎΠ»Π΅Π΅ ΡΠ»ΠΎΠΆΠ½ΡΡ
ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΎΡΠ΅Π½ΠΊΠΈ ΠΏΠ΅ΡΡΠΎΠ½Π°Π»Π°); ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΎΡΠΊΡΡΡΠΎΡΡΠΈ ΠΎΡΠ΅Π½ΠΊΠΈ (Π΄ΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ Π΄ΠΎ ΠΊΠ°ΠΆΠ΄ΠΎΠ³ΠΎ ΡΠΎΡΡΡΠ΄Π½ΠΈΠΊΠ° ΠΏΡΠ°Π²ΠΈΠ», ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² ΠΈ ΠΏΠΎΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠΉ ΠΎΡΠ΅Π½ΠΊΠΈ); Π²Π½Π΅Π΄ΡΠ΅Π½ΠΈΠ΅ Π·Π°ΡΡΠ±Π΅ΠΆΠ½ΡΡ
ΠΎΡΠ΅Π½ΠΎΡΠ½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΈ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΈΡ
Π°Π΄Π°ΠΏΡΠ°ΡΠΈΡ ΠΊ Π½Π°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠΉ ΡΠΏΠ΅ΡΠΈΡΠΈΠΊΠ΅
Biased diffusion in a piecewise linear random potential
We study the biased diffusion of particles moving in one direction under the
action of a constant force in the presence of a piecewise linear random
potential. Using the overdamped equation of motion, we represent the first and
second moments of the particle position as inverse Laplace transforms. By
applying to these transforms the ordinary and the modified Tauberian theorem,
we determine the short- and long-time behavior of the mean-square displacement
of particles. Our results show that while at short times the biased diffusion
is always ballistic, at long times it can be either normal or anomalous. We
formulate the conditions for normal and anomalous behavior and derive the laws
of biased diffusion in both these cases.Comment: 11 pages, 3 figure
Extended Gari-Krumpelmann model fits to nucleon electromagnetic form factors
Nucleon electromagnetic form factor data (including recent data) is fitted
with models that respect the confinement and asymptotic freedom properties of
QCD. Gari-Krumpelmann (GK) type models, which include the major vector meson
pole contributions and at high momentum transfer conform to the predictions of
perturbative QCD, are combined with Hohler-Pietarinen (HP) models, which also
include the width of the rho meson and the addition of higher mass vector meson
exchanges, but do not evolve into the explicit form of PQCD at high momentum
transfer. Different parameterizations of the GK model's hadronic form factors,
the effect of including the width of the rho meson and the addition of the next
(in mass) isospin 1 vector meson are considered. The quality of fit and the
consistency of the parameters select three of the combined HP/GK type models.
Projections are made to the higher momentum transfers which are relevant to
electron-deuteron experiments. The projections vary little for the preferred
models, removing much of the ambiguity in electron-nucleus scattering
predictions.Comment: 18pp, 7 figures, using RevTeX with BoxedEPS macros; 1 new figure,
minor textual changes; email correspondence to [email protected]
Effect of recent R_p and R_n measurements on extended Gari-Krumpelmann model fits to nucleon electromagnetic form factors
The Gari-Krumpelmann (GK) models of nucleon electromagnetic form factors, in
which the rho, omega, and phi vector meson pole contributions evolve at high
momentum transfer to conform to the predictions of perturbative QCD (pQCD), was
recently extended to include the width of the rho meson by substituting the
result of dispersion relations for the pole and the addition of rho' (1450)
isovector vector meson pole. This extended model was shown to produce a good
overall fit to all the available nucleon electromagnetic form factor (emff)
data. Since then new polarization data shows that the electric to magnetic
ratios R_p and R_n obtained are not consistent with the older G_{Ep} and G_{En}
data in their range of momentum transfer. The model is further extended to
include the omega' (1419) isoscalar vector meson pole. It is found that while
this GKex cannot simultaneously fit the new R_p and the old G_{En} data, it can
fit the new R_p and R_n well simultaneously. An excellent fit to all the
remaining data is obtained when the inconsistent G_{Ep} and G_{En} is omitted.
The model predictions are shown up to momentum transfer squared, Q^2, of 8
GeV^2/c^2.Comment: 14 pages, 8 figures, using RevTeX4; email correspondence to
[email protected] ; minor typos corrected, figures added, conclusions
extende
Atomistic Studies of Defect Nucleation during Nanoindentation of Au (001)
Atomistic studies are carried out to investigate the formation and evolution
of defects during nanoindentation of a gold crystal. The results in this
theoretical study complement the experimental investigations [J. D. Kiely and
J. E. Houston, Phys. Rev. B, v57, 12588 (1998)] extremely well. The defects are
produced by a three step mechanism involving nucleation, glide and reaction of
Shockley partials on the {111} slip planes noncoplanar with the indented
surface. We have observed that slip is in the directions along which the
resolved shear stress has reached the critical value of approximately 2 GPa.
The first yield occurs when the shear stresses reach this critical value on all
the {111} planes involved in the formation of the defect. The phenomenon of
strain hardening is observed due to the sessile stair-rods produced by the
zipping of the partials. The dislocation locks produced during the second yield
give rise to permanent deformation after retraction.Comment: 11 pages, 13 figures, submitted to Physical Review
Superhydrophobic asphalt pavements: surface improvement
The most adverse weather condition for road safety happens when there is water, snow, or ice on the road surface because their presence highly decreases friction. Therefore, it is essential to drain or repel them quickly. If the water drops are repelled from the surface or the ice/snow formation is avoided with the application of superhydrophobic coatings, roads become safer. In order to functionalize the asphalt mixtures used in road pavements, nano/micromaterials, such as Polytetrafluoroethylene (PTFE), TiO2, and SiO2, among others have been applied by spraying coating. The mixes are usually characterized by the water contact angle, and the surface roughness is typically assessed by optical and electron analysis. This research work aims to present a brief overview of superhydrophobic asphalt mixtures
Extracting Br(omega->pi^+ pi^-) from the Time-like Pion Form-factor
We extract the G-parity-violating branching ratio Br(omega->pi^+ pi^-) from
the effective rho-omega mixing matrix element Pi_{rho omega}(s), determined
from e^+e^- -> pi^+ pi^- data. The omega->pi^+ pi^- partial width can be
determined either from the time-like pion form factor or through the constraint
that the mixed physical propagator D_{rho omega}^{mu nu}(s) possesses no poles.
The two procedures are inequivalent in practice, and we show why the first is
preferred, to find finally Br(omega->pi^+ pi^-) = 1.9 +/- 0.3%.Comment: 12 pages (published version
Patterned nanostructure in AgCo/Pt/MgO(001) thin film
The formation of patterned nanostructure in AgCo/Pt/MgO(001) thin film is
simulated by a technique of combining molecular dynamics and phase-field
theory. The dislocation (strain) network existing in Pt/MgO is used as a
template whose pattern is transferred to AgCo phase in spinodal decomposition,
resulting in regular arrays of Co islands that are attracted by the
dislocations. The influence of various factors, such as component concentration
and film thickness, is studied. It is found that the spinodal decomposition of
AgCo in this system is mainly characterized by a competition between a
surface-directed layer structure and the strain-induced patterned structure,
where the patterned Ag-Co structure only dominates in a small range near the
interface (less than 10 atomic layers). However, if the interlayer diffusion
can be minimized by controlling film growth conditions, it is shown that the
patterned structure can be formed throughout the entire film.Comment: 8 pages, 12 figure
- β¦