作者机构：
[Li, ZY] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.;Huazhong Univ Sci & Technol, Dept Solid State Elect, Wuhan 430074, Peoples R China.
通讯机构：
[Li, ZY] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
会议名称：
44th International Field Emission Symposium
会议时间：
JUL 07-11, 1997
会议地点：
NATL RES INST MET, TSUKUBA, JAPAN
会议主办单位：
Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.^Huazhong Univ Sci & Technol, Dept Solid State Elect, Wuhan 430074, Peoples R China.
摘要：
The paper introduced an effective binding energy Lambda'(eff) and emphasized the role it plays in the field evaporation in the configuration of a scanning tunneling microscope (STM). With this Lambda'(eff) an important modification has been made to Tsong's CE model formula for STM [Tien T. Tsong, Phys. Rev. B 44 (1991) 13 703]. As a consequence, for tip-sample distance 5 < d < 13 Angstrom, the high evaporation fields from Tsong's original formula were found greatly reduced. When d = 7.23 Angstrom, the recalculated evaporation field for Au-1 is 0.6 V/Angstrom, which is in good agreement with Chang's experiment [Phys. Rev. Lett. 72 (1994) 574]. Further the evaporation field was found highly localized. For d = 7.52 Angstrom, the evaporation field of Au-1 on top of a Au(1 1 1) surface atom was found several times lower than that at a hollow site. In the calculation we have proposed a universal binding function. In addition selected experimental results on nanostructure formation by positive or negative voltage pulses with Au, Ni, Cu, Pt(Ir) and W tips on Au(1 1 1) substrate with a STM working in atmosphere were presented. The processes were found to bear important feature of field evaporation. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
作者机构：
[Yang, LT] Huazhong Normal Univ, Inst Astrophys, Wuhan 430070, Peoples R China.;Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
通讯机构：
[Yang, LT] H;Huazhong Normal Univ, Inst Astrophys, Wuhan 430070, Peoples R China.
关键词：
Accretion disk;Radial-azimuthal instability
摘要：
The radial-azimuthal instability of an isothermal magnetized accretion disk is examined in this paper. We find that the azimuthal perturbation enhances the instability of the magneto-acoustic and non-axisymmetric modes. The magnetic field induces and enhances the instability of magneto-acoustic modes, but stabilizes the non-axisymmetric modes in the outer disk. The viscous modes are always stable. The instability of magneto-acoustic modes are dominant in this disk.
摘要：
The derivative expansion method has been used to solve the semiclassical kinetic equations of quark-gluon plasma. The nonlinear spatial damping rate, the imaginary part of the wave vector, for the longitudinal secondary color waves in the long wavelength limit has been calculated numerically. (C) 1998 Elsevier Science B.V. All rights reserved.
作者机构：
[Adamovich, MI] Inst High Energy Phys, Alma Ata, Kazakhstan.;Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China.;Inst Gravitat & Space Res, Bucharest, Romania.;Panjab Univ, Dept Phys, Chandigarh 160014, India.;Hunan Educ Inst, Dept Phys, Changsha, Hunan, Peoples R China.
通讯机构：
[Adamovich, MI] I;Inst High Energy Phys, Alma Ata, Kazakhstan.
摘要：
We analyse the multifractal structure of moments G(q) in terms of a new variable X on data of (197)AU, S-32, and O-16 induced interactions with emulsion nuclei and Monte Carlo generated samples. The dynamical properties of the produced particles are mapped onto multifractal spectra. We compare In(G) in experimental data of Au-197, S-32, and O-16 with pure statistical fluctuations. It is shown that the stochasticity plays an important role for the G-moments.
摘要：
Using emulsion detectors a transverse-momentum analysis of projectile fragments has been performed in Au induced nuclear interactions at 11.6 A GeV/c. Evidence for collective flow of the projectile fragments has been obtained. Angular distributions of the principal vectors of projectile and target fragments have shown strong azimuthal correlation.
期刊：
Chemical Physics,1998年230(1):45-56 ISSN：0301-0104
通讯作者：
Zhan, CG
作者机构：
Cent China Normal Univ, Dept Chem, Wuhan 430070, Peoples R China.;Inst Mol Sci, Okazaki, Aichi 444, Japan.;[Zhan, CG] Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA.
通讯机构：
[Zhan, CG] U;Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA.
摘要：
In order to reassign recently reported resonance Raman spectra of the reduced forms of 1,4-benzoquinone (BQ), ab initio MO and density functional calculations have been carried out for evaluating fundamental vibrational frequencies of BQ, BQ-, BQ2- and their various isotopomers. Comparing with the reported experimental frequencies and their isotope shifts of BQ, the vibrational frequencies calculated by using Becke's 1988 exchange functional with Perdew-Wang's 91 gradient-corrected correlation functional (BPW91) are closest to the corresponding experimental data. Due to the reliability of the BPW91 results, the vibrational frequencies of BQ, BQ-, BQ2- and their various isotopomers calculated with this unified method have been employed to further discuss the assignments of the recently reported resonance Raman (RR) bands of the BQ- and BQ2-. The previous assignments of the most vibrational bands are well confirmed. However, based on the calculated results, it is more reasonable to reassign the three bands at 1046, 748 and 638 cm-1 in the spectra of the BQ- existing in CH3CN to the fourth b2u, the b1g and the fourth b3g fundamental modes, respectively. It seems also reasonable to assign the weaker band at 864 cm-1 appeared in the spectra of BQ2- in the aqueous solution to the first b2g fundamental mode, though we cannot completely exclude the possibility of the first au fundamental mode before the RR spectra of the 16O2/18O2-substituted BQ2- isotopomer in the region below 800 cm-1 are obtained.
作者机构：
[Li, WP; Wan, HW] Department of Chemistry, Central China Normal University, Wuhan, 430070, China;[Qu, SS; Liu, Y; Wang, TZ; Wu, DQ] Department of Chemistry, Wuhan University, Wuhan, 430072, China
摘要：
Harmonic maps with potential from complete manifolds are considered. This is a new kind of maps more general than the usual harmonic maps relating to many interesting problems such as equilibrium system of ferromagnetic spin chain and Neumann motion. Aiming at the general properties, the author derives basic gradient estimates and then Liouville type results for these maps, which are interesting in constrast to those of the usual harmonic maps for the presence of potentials.
关键词：
05.70.Jk Critical point phenomena;64.60.i General studies of phase transitions;75.40.Mg Numerical simulation studies
摘要：
We derive exact results for several thermodynamic quantities of the O
(
n
) symmetric
field theory in the limit
in a finite d-dimensional hypercubic geometry with periodic boundary conditions. Corresponding results are derived for an O
(
n
) symmetric
model on a finite d-dimensional lattice with a finite-range interaction. The leading finite-size effects near Tc of the field-theoretic model are compared with those of the lattice model. For 2 <
d
< 4, the finite-size scaling functions are verified to be universal. For d
> 4, significant lattice effects are found. Finite-size scaling in its usual simple form does not hold for d
> 4 but remains valid in a generalized form with two reference lengths. The finite-size scaling functions of the
field theory turn out to be nonuniversal whereas those of the
lattice model are independent of the nonuniversal model parameters. In particular, the field-theoretic model exhibits finite-size effects whose leading exponents differ from those of the lattice model. The widely accepted lowest-mode approach is shown to fail for both the field-theoretic and the lattice model above four dimensions.
作者机构：
[Meng, JL; Gan, L] Huazhong Normal Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China.
通讯机构：
[Meng, JL] H;Huazhong Normal Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China.
关键词：
芸苔属;亲缘关系;可交配性;DNA指纹
摘要：
Moricandia与芸苔属作物间的可交配性很低,仅从 M. arvensis×甘蓝型油菜的105枚培养子房中获得4个杂种苗。用23个甘蓝型油菜核DNA探针和4个甜菜线粒体DNA探针检测了芸苔属作物和 Moricandia C_(3)-C_(4)植物间DNA限制性内切酶点多态性。 Moricandia与芸苔属物种间的同源性很高,其中白菜型油菜与 M. nitens之间在核基因组上的相似性甚至大于它与同属的甘蓝型油菜间的相似性。 M oricandia C_(3)-C_(4)物种与芸苔属作物在核DNA和细胞质DNA间的高度同源性,揭示了通过有性杂交或原生质体融合及染色体间重组的途径向栽培种转移重要基因的可能性。
摘要：
"Minghui 63" is the restorer line for a number of the most important commercial rice hybrids varieties in China. To facilitate long-term commitment in genetic analysis and molecular cloning of the superior genes in the genome of "Minghui 63", the authors have constructed a large-insert genomic DNA library using the bacterial artificial chromosome (BAC) cloning vector (pBe-loBAC11). Size fractionated Hin d III digest of genomic DNA was ligated to the BAC vector, and the ligation mixture was used to transform the bacterial strain DH10B. A total of over 26 000 clones were obtained with the average insert size of about 150 kb, ranging from 90 to 240 kb. These clones thus represent 9 x rice haploid genome equivalents. The library is now being used for physical mapping of several genomic regions for map-based gene cloning.
作者机构：
Cent China Normal Univ, Dept Chem, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Organ Synth, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Ctr Anal & Testing, Wuhan 430079, Peoples R China.;[Lu, SM] Departmeent of Chemistry, Central China Normal University, Wuhan 430079, China;[Huang, WF; Xiao, WJ] Institute of Organic Systhesis, Central China Normal University, Wuhan 430079, China
通讯机构：
[Lu, S.M.] D;Departmeent of Chemistry, Central China Normal University, China
摘要：
A series of new ω-azolylalkenes 3 were synthesized by N-alkylation of ω-bromoalkenes 2 which were obtained by Witting reaction of ω-hydroxyalkylphosphonium bromide with aromatic aldehydes and subsequent bromination. The structures of products were confirmed by 1HNMR, IR, MS and elemental analysis. The preliminary bioassay indicated that some of them had high fungicidal activities.
作者机构：
[Yang, CB] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;KFKI, RMKI, Div Theory, H-1525 Budapest 114, Hungary.;Hubei Univ, Dept Phys, Wuhan 430062, Peoples R China.
通讯机构：
[Yang, CB] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
The multiplicity difference correlators between two well-separated bins in high-energy heavy-ion collisions are studied as a means to detect evidence of a first-order quark-hadron phase transition. Analytical expressions for the scaled factorial moments of multiplicity difference distribution are obtained for small bin size delta with mean multiplicity in the bin (s) over bar less than or equal to 1.0 within the Ginzburg-Landau description. The scaling behaviours between the moments are still valid, although they behave completely different from the so-called intermittency patterns. A universal exponent gamma = 1.4066 is given to describe the dynamical fluctuations in the phase transition in the small delta limit.
作者机构：
[Yang, CB] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;KFKI, RMKI, Div Theory, H-1525 Budapest, Hungary.;Hubei Univ, Dept Phys, Wuhan 430062, Peoples R China.
通讯机构：
[Yang, CB] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
Deviation of the multiplicity distribution Pq in a small bin from its Poisson counterpart pq is studied within the Ginzburg-Landau description for a second-order quark-hadron phase transition. The dynamical factor dq≡Pq/pq for the distribution and the ratio Dq≡dq/d1 are defined, and novel scaling behaviors between Dq are found which can be used to detect the formation of quark-gluon plasma. The study of dq and Dq is also very interesting for other multiparticle production processes without a phase transition.
作者机构：
[Luo, YP; Wu, TJ; He, LN; Li, K; Liu, XP] Cent China Normal Univ, Inst Organ Synth, Wuhan 430079, Peoples R China.
通讯机构：
[He, LN] C;Cent China Normal Univ, Inst Organ Synth, Wuhan 430079, Peoples R China.
摘要：
2,4-Bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4- disulfide(Lawesson's Reagent), reacts with salicylaldehyde hydrazones 2 in benzene at reflux temperature to form 3H-Benzo[f]-1,3,4,2-oxadiazaphosphepin-2-sulfide 3 . The structure has been confirmed by elementary analyses, NMR, IR, MS. The results of preliminary bioassay indicates that some of the title compounds possess seletive herbicidal activity.
摘要：
A series of title compounds were synthesized by the addition reaction of dialkyl-αhydroxyphosphonates and phenyl isocyanate under base catalysis. All new compounds have been identified by 1H NMR, 31P NMR, IR and elemental analysis.
期刊：
Chinese Astronomy and Astrophysics,1998年22(4):386-394 ISSN：0275-1062
通讯作者：
Yang, PB
作者机构：
[Yang, PB] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China.;Wuhan Coll Text Sci & Technol, Wuhan 430073, Peoples R China.
通讯机构：
[Yang, PB] C;Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China.
关键词：
hot accretion flow;advection;e(+/-) pair process
摘要：
By means of the self-similar relations of the hot flow with advection and nonthermal e± pair production, we examine the radial structure of such a flow. Some typical features have been confirmed, and several new results obtained: there exists a critical radius rcr; the local cooling rate is inversely proportional to the square of the mass of the central object; the pair density in the accretion flow with advection is higher than in the SLE disk.
