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排序方式: 共有63条查询结果,搜索用时 15 毫秒
1.
J. Mass M. Avella J. Jimnez M. Callahan E. Grant K. Rakes D. Bliss B. Wang 《Superlattices and Microstructures》2007,42(1-6):306
Understanding the luminescence of ZnO is very important for some applications. In spite of the many studies carried out, there are still some points concerning the origin of some of the luminescence emissions in ZnO crystals that require additional study; in particular, the role of extended defects remains to be a matter of controversy. We present here a cathodoluminescence analysis of the defects generated by Vickers indentation in hydrothermal HTT crystals. Special emphasis was paid to the luminescence band peaking around 3.3 eV. The origin of this band is a matter of controversy, since it has been related to different causes, extended defects being one of the candidates for this emission. The CL images were acquired around crystal defects. It is observed that the 3.3 eV emission is enhanced around the crystal defects; though it is also observed, but weaker, out of the defect regions, which suggests that there exist two luminescence emissions peaking very close to 3.3 eV. The two emissions, one related to structural defects and the other to the LO phonon replica of the free excitonic band, appear very close each other and their relative intensity should determine the shape of the spectrum. 相似文献
2.
KL Britton HF Rogers Y Asano T Dairi Y Kato TJ Stillman DW Rice 《Acta crystallographica. Section D, Biological crystallography》1998,53(4):124-126
The novel NAD+-linked opine dehydrogenase from a soil isolate Arthrobacter sp. strain 1C belongs to an enzyme superfamily whose members exhibit quite diverse substrate specificites. Crystals of this opine dehydrogenase, obtained in the presence or absence of co-factor and substrates, have been shown to diffract to beyond 1.8 ? resolution. X-ray precession photographs have established that the crystals belong to space group P21212, with cell parameters a = 104.9, b = 80.0, c = 45.5 ? and a single subunit in the asymmetric unit. The elucidation of the three-dimensional structure of this enzyme will provide a structural framework for this novel class of dehydrogenases to enable a comparison to be made with other enzyme families and also as the basis for mutagenesis experiments directed towards the production of natural and synthetic opine-type compounds containing two chiral centres. 相似文献
3.
Artuso M Gao M Goldberg M He D Horwitz N Moneti GC Mountain R Muheim F Mukhin Y Playfer S Rozen Y Stone S Xing X Zhu G Bartelt J Csorna SE Egyed Z Jain V Gibaut D Kinoshita K Pomianowski P Barish B Chadha M Chan S Cowen DF Eigen G Miller JS O'Grady C Urheim J Weinstein AJ Würthwein F Asner DM Athanas M Bliss DW Brower WS Masek G Paar HP Gronberg J Korte CM Kutschke R Menary S Morrison RJ Nakanishi S Nelson HN Nelson TK Qiao C Richman JD Roberts D Ryd A Tajima H Witherell MS Balest R Cho K 《Physical review letters》1995,75(5):785-789
4.
Asner DM Athanas M Bliss DW Brower WS Masek G Paar HP Gronberg J Korte CM Kutschke R Menary S Morrison RJ Nakanishi S Nelson HN Nelson TK Qiao C Richman JD Roberts D Ryd A Tajima H Witherell MS Balest R Cho K Ford WT Lohner M Park H Rankin P Smith JG Alexander JP Bebek C Berger BE Berkelman K Bloom K Browder TE Cassel DG Cho HA Coffman DM Crowcroft DS Dickson M Drell PS Dumas DJ Ehrlich R Elia R Gaidarev P Garcia-Sciveres M Gittelman B Gray SW Hartill DL Heltsley BK Henderson S Jones CD 《Physical review D: Particles and fields》1996,53(3):1039-1050
5.
6.
E. S. Bliss 《Optical and Quantum Electronics》1971,3(2):99-108
A number of mechanisms for internal laser damage in transparent dielectrics are examined for pulse duration dependence and the results are compared with experimental measurements when possible. The differences in dependence on pulse duration and other variables from one mechanism to another suggest that different mechanisms may initiate damage in different parameter ranges. Experimental identification of these mechanisms will be aided by measuring the pulse duration dependence of the damage threshold.Symbols
bulk absorption coefficient
-
thermal volume expansion coefficient
-
C
heat capacity per unit volume
-
c
velocity of light in vacuum
-
D
thermal diffusivity
-
E
instantaneous electric field strength
-
E
0
electric field amplitude
-
e
charge on an electron
-
e
spectral emissivity at the laser wavelength
-
c
band gap energy
-
d
energy density (energy per unit cross-sectional area)
-
e
electron energy
-
k
volume compressibility
-
k
wave vector
-
L
sample length
-
L
f
focusing length
-
wavelength in vacuum
-
M
multiplication factor to correct particle cross-section for Mie effect
-
m
*
electron effective mass
-
N
conduction electron number density
-
N
b
value ofN required for breakdown
-
n
number of photons absorbed inn-photon ionisation
-
n
refractive index
-
n
0
original refractive index
-
n
2
coefficient for quadratic term in expression for refractive index
-
n
change in refractive index
-
P
d
power density (power per unit cross-sectional area)
-
R
inclusion radius
-
R
s
sample radius
-
r
distance from centre of inclusion
-
r
b
beam radius
-
S
breaking strength, damaging stress
-
T
temperature
-
t
time
-
t
time required to accelerate an electron to the energy of the conduction band
-
t
pulse duration
-
time required for acoustic wave to propagate across the beam
-
e
conduction electron lifetime
-
U
velocity
-
angular velocity (frequency times 2) 相似文献
7.
Bartelt J Csorna SE Egyed Z Jain V Gibaut D Kinoshita K Pomianowski P Barish B Chadha M Chan S Cowen DF Eigen G Miller JS O'Grady C Urheim J Weinstein AJ Würthwein F Asner DM Athanas M Bliss DW Brower WS Masek G Paar HP Gronberg J Korte CM Kutschke R Menary S Morrison RJ Nakanishi S Nelson HN Nelson TK Qiao C Richman JD Roberts D Ryd A Tajima H Witherell MS Balest R Cho K Ford WT Lohner M Park H Rankin P Smith JG Alexander JP Bebek C Berger BE Berkelman K Bloom K Browder TE Cassel DG Cho HA 《Physical review D: Particles and fields》1995,52(9):4860-4867
8.
Hammond P. R. Fletcher A. N. Bliss D. E. Henry R. A. Atkins R. L. Moore D. W. 《Applied Physics A: Materials Science & Processing》1976,9(1):67-70
A potential new class of “monocyclic” lasing dyes is discussed and four families out of nine within the class are examined.
The 2,6-diaminopyridines in acid are found to lase under flashlamp excitation but show low slope efficiencies and lower stabilities
than the “bicyclic” dyes described previously. Other, miscellaneous dyes show oxygen quenching of laser action rather than
enhancement and the best of these produces short pulses under long pulse excitation.
This study was supported under contract SANL 284 from the Lawrence Livermore Laboratory. 相似文献
9.
Serena Fantasia Björn Bartels Fritz Bliss Fritz Koch Michelangelo Scalone Daniel Spiess Markus Steiner Shaoning Wang Kurt Püntener 《Helvetica chimica acta》2023,106(10):e202300116
The research efforts to attain a suitable process for the timely delivery of Gemlapodect for initial toxicological and phase 1/2 clinical studies are described. The original discovery chemistry route was hampered by considerable safety issues and low overall yield. The safety issues were solved by the introduction of a copper-catalyzed oxidative cyclization while a novel process for the synthesis of the pyrazole building block as well as the implementation of a palladium-catalyzed coupling between the pyrazole amide and the bromo-triazolopyridine scaffolds contributed to improve the route efficiency. Overall, a safe and sustainable process was attained that allowed the production of up to 19.2 kg of drug substance with a reduced number of steps and an increased overall yield. 相似文献
10.
Gibbons L Johnson SD Kwon Y Roberts S Thorndike EH Jessop CP Lingel K Marsiske H Perl ML Schaffner SF Wang R Coan TE Dominick J Fadeyev V Korolkov I Lambrecht M Sanghera S Shelkov V Stroynowski R Volobouev I Wei G Artuso M Efimov A Gao M Goldberg M He D Horwitz N Kopp S Moneti GC Mountain R Mukhin Y Playfer S Skwarnicki T Stone S Xing X Bartelt J Csorna SE Jain V Marka S Freyberger A Gibaut D Kinoshita K Pomianowski P Schrenk S Cinabro D Barish B Chadha M Chan S Eigen G Miller JS O'Grady C 《Physical review letters》1996,77(5):810-813