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1.
Wolfgang Oppolzer Giovanni Poli Arend J. Kingma Christian Starkemann Grald Bernardinelli 《Helvetica chimica acta》1987,70(8):2201-2214
The 1,4-addition of alkylmagnesium chlorides to conjugated N-enoylsultams and subsequent ‘enolate trapping’ with aq. NH4Cl or MeI/hexamethylphosphoric triamide generated centers of asymmetry at C(β) and/or at C(α) with good to excellent π-face defferentiation as demonstrated by the conversions 1 → 2 , 1 → 4 , and 8 → 9 . This holds also for the regioselective 1,4-addition of EtMgC1 to a dienoylsultam ( 15 → 16 ). Reactive conformations 1 ≠, 8 ≠, 13 , and 14 are postulated in agreement with X-ray evidence which also served for the structure determination of the product 9j . 相似文献
2.
Using a proton-nitrogen double resonance technique we have determined the quadrupole coupling of14N in the room temperature orthorhombic (Cmca), the low temperature tetragonal (P42/ncm), and the monoclinic low temperature (P21/c) phases of (CH3NH3)2CdCl4. In all these phases all nitrogens are chemically equivalent demonstrating that the disorder in the orientations and H-bonding arrangements of the CH3-NH3 groups in theC m c a andP42/ncm phases is indeed dynamic and not static. In the monoclinic phase the14N quadrupole coupling constant equalse
2
qQ/h=880 kHz and the asymmetry parameter is=0.20, wherease
2
qQ/h=790 kHz,=0.1 in the tetragonal low temperature phase ande
2
qQ/h=726 kHz,=0.21 in the room temperature orthorhombic phase. The observed increase in the14N quadrupole coupling constant on going from the orthorhombic phase to the tetragonal low temperature phase which is coupled with a simultaneous decrease in the asymmetry parameter can be understood in terms of a partial freezing in of the dynamic disorder in the C-N bond directions whereas the14N quadrupole coupling tensor in the monoclinic phase is characteristic of a frozen in C-N bond in a deformed lattice, where the N-H — Cl bonds are of different length. 相似文献
3.
4.
Jorge M. Garcia Ulrich Wurstbauer Antonio Levy Loren N. Pfeiffer Aron Pinczuk Annette S. Plaut Lei Wang Cory R. Dean Roberto Buizza Arend M. Van Der Zande James Hone Kenji Watanabe Takashi Taniguchi 《Solid State Communications》2012,152(12):975-978
The growth of single layer graphene nanometer size domains by solid carbon source molecular beam epitaxy on hexagonal boron nitride (h-BN) flakes is demonstrated. Formation of single-layer graphene is clearly apparent in Raman spectra which display sharp optical phonon bands. Atomic-force microscope images and Raman maps reveal that the graphene grown depends on the surface morphology of the h-BN substrates. The growth is governed by the high mobility of the carbon atoms on the h-BN surface, in a manner that is consistent with van der Waals epitaxy. The successful growth of graphene layers depends on the substrate temperature, but is independent of the incident flux of carbon atoms. 相似文献
5.
An overview is given describing phenomena at heated microelectrodes where matter and heat energy are simultaneously emitted into the solution. With controlled electric heating, virtual “quiescent” periods as well as ones with constant streaming conditions are found that depend on the heating time. A close look at a permanently heated wire reveals a well defined structure with stationary concentration, temperature and flow rate profiles. The observed phenomena can be utilised for analytical measurements, e.g. with the novel method “Temperature Pulse Voltammetry” (TPV). 相似文献
6.
Single crystals of BaTiO3, prepared by crystallization in the system BaCl2-BaO-BaTiO3-show a dependence of the optical absorption coefficient on the sample thickness. The observed thickness dependence of the absorption coefficient can be explained by the existence of a surface layer with optical properties differing from those of the inner part of the crystal. By means of an etching method a direct determination of the thickness of the surface layer of crystals in the thickness range of 0.075 to 0.178 mm was carried out. The value found is (6.0±0.2)×10-4 cm.
iO3, 12-BaO-BaTiO3 . . 0,075 0,178 mm. (6,0±0,2). 10-4 cm.相似文献
7.
Using an Iterated Prisoner's Dilemma with Exit Option to Study Alliance Behavior: Results of a Tournament and Simulation 总被引:1,自引:0,他引:1
Steven?E.?PhelanEmail author Richard?J.?Arend Darryl?A.?Seale 《Computational & Mathematical Organization Theory》2005,11(4):339-356
Nearly half of all strategic alliances fail (Park and Russo, 1996; Dyer et al., 2001), often because of opportunistic behavior
by one party or the other. We use a tournament and simulation to study strategies in an iterated prisoner's dilemma game with
exit option to shed light on how a firm should react to an opportunistic partner. Our results indicate that a firm should
give an alliance partner a second chance following an opportunistic act but that subsequent behavior should be contingent
on the value of the next best opportunity outside the alliance. Firms should be more forgiving if the potential benefits from
the alliance exceed other opportunities. The strategies were also found to be robust across a wide range of game lengths.
The implications of these results for alliance strategies are discussed.
Steven E. Phelan received his PhD in economics from La Trobe University (Australia) in 1998. Following five years at the University of Texas
at Dallas, he joined the faculty of the University of Nevada Las Vegas in 2003. Dr. Phelan's research interests include competitive
dynamics, organizational efficiency, acquisition and alliance performance, and entrepreneurial competence. His methods of
choice to study these phenomena include agent-based modelling, experimental game theory, and event studies. Prior to joining
academia, Dr. Phelan held executive positions in the telecommunications and airline industries and was a principal partner
in Bridges Management Group, a consultancy specializing in strategic investment decisions.
Richard J. Arend is a graduate of the University of British Columbia's doctoral program in Policy Analysis and Strategy. He is on the Management
faculty of the University of Nevada, Las Vegas, arriving most recently from the Management faculty of New York University's
Stern School of Business. Dr. Arend's interests lie in the analysis of unusual modes of firm value creation and destruction,
where he has published in several top journals. He is a professional engineer with work and consulting experience in aerospace
and computing.
Darryl A. Seale joined the faculty of UNLV in 1999, following three years at Kent State University and the University of Alabama in Huntsville.
Prior to Alabama, he completed his Ph.D. and M.S. degrees in Business Administration at the University of Arizona, his M.B.A.
from Penn State University, and spent over ten years in management and market planning positions in the health care industry.
Professor Seale's research interests include strategic decision making, bargaining and negotiation, and behavioral game theory.
His research has been funded by the National Science Foundation and has been published in top-tier journals including Management
Science, OBHDP, Games and Economic Behavior, and Strategic Management Journal. His teaching interests include business policy/strategy,
managerial decision making, and bargaining and negotiation. 相似文献
8.
Czechoslovak Journal of Physics - 相似文献
9.
10.
(CnH2n+1NH3)2MnCl4 consist of perovskite-type layers sandwiched between hydrocarbon radical layers. New phase transitions were found between liquid nitrogen and decomposition temperature in these compounds by differential thermal analysis and hot stage microscopy. A systematic research of the lattice dynamics, the transition mechanisms, their influence on physical properties and their dependence on the various possibilities of molecular engineering offered in these quasi two-dimensional perovskites was started. 相似文献